NT1+2a/b+V.24
ISDN Network Terminating Unit
with two analog interfaces
and one data interface V.24 (RS232)

U

~

B1

B2

NT1+2a/b+V.24

User manual
© ELCON Systemtechnik GmbH 2000

Poland 7111-1


A
Access code
Alternating between two call partners
Analog interfaces
AT Command set
C
Cable coupling
Call waiting
Call waiting enable
CFB

CFNR
CFU
Clearback time delay
CLIP
CLIR
CLIR per call
COLR
Configuration
Connection facilities
CUG
D
Demounting
Description
DIP Switches
Distinctive ringing
E
Extended passive bus
F
Fastening the device
Features
G
Global call
H
HOLD
Hotline call
I
Initial commissioning
Interfaces
ISDN


11
19
3
31
9
19
14
17
18
16
15
16
16
16
16
11
7
16
10
2
10
14
7
6
26
13
18
15
11
7

2

L
LED display
Local software update
M
MCID
Mounting
MSN
O
Operation
P
Pin assignment at data interface V.24
(RS232)
Pin assignment of RJ11 jacks at S/T
interface
Pin assignment of RJ45 jacks at analog
interfaces
Point-to-point configuration
Protocol
R
Reset (Hardware)
RESUME
RETRIEVE
S
S-bus configuration
Safety precautions
Scope of delivery
Selection of mounting site
Short passive bus

Software installation
State upon delivery
SUSPEND
System prerequisites
T
Technical data
Technical description
Terminating resistors
Three Party Conference (3PTY)
Type of terminal equipment
V
V.24 interface
Y
Y Configuration

21
36
20
6
12
11
30
30
30
7
14
16
20
18
13

5
6
6
7
22
11
20
4
28
26
9
19
12
3
7


NT1+2a/b+V.24

Contents

Disk
This disc includes the drivers for your NT1+2a/b+V.24 and the configuration software
„NT1+2a/b+V.24 configurator“.

Hint:
•
•
•
•


40

NT1+2a/b+V.24

You can download the actual driver software from internet:
www.elcon-system.de
Select the language and press the button “Products”.
Choose “E0” and select “NT1+2a/b+V.24”.
Now press the button “Drivers and software for configuration”.
There you can find the language you need.

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

1
1.1
1.2
1.3
1.4
2
2.1
2.2
2.3
2.4
2.5
3
3.1
3.2
3.3
3.4

3.5
3.6
4
4.1
4.2
4.3
4.4
4.5
4.6
5
5.1
5.2
Annex
Annex A
Annex B
Annex C
Annex D
Annex D.1
Annex D.2
Annex D.3
Annex D.4
Annex D.5
Annex D.6

Introduction
Description of the NT1+2a/b+V.24
The NT1+2a/b+V.24 in use
System prerequisites for installation of the NT1+2a/b+V.24
Safety precautions
Mounting

Scope of delivery
Selection of mounting site / Fastening the device NT1+2a/b+V.24
Connection facilities and realization of cable coupling
Configuration of DIP switches
Procedure for demounting the NT1+2a/b+V.24
Operation of the NT1+2a/b+V.24
Initial commissioning
State upon delivery
Configuration of the analog ports via DTMF
Using ISDN services with analog telephones
LED display at the device
Operation of the NT1+2a/b+V.24 in case of local power-supply
breakdown (emergency mode)
Using the NT1+2a/b+V.24 as ISDN modem
Installation procedure
Windows 95/98 software installation
Windows NT 4.0 software installation
Configuration
Configuration for Internet
Configuration for AOL/CompuServe
Technical data
Technical description
Technical data
Pin assignment of the RJ 45 jacks at S/T interface
Pin assignment of the RJ 11 jacks at the analog interface
Pin assignment at data interface V.24 (RS232)
AT command set for computer access
AT command set
ISDN access control
Subaddressing

Local software update
List of NT1+Configurator commands (Analog port AT commands)
NT1+Configuration commands

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

2
2
3
4
5
6
6
6
7
10
10
11
11
11
11
18
21
21
22
22
22
23
24
25

26
26
26
28
30
30
30
30
31
31
35
36
36
37
38
1


NT1+2a/b+V.24
1
1.1

Introduction
Description of the NT1+2a/b+V.24

NT1+2a/b+V.24
FWSTART

The NT1+2a/b+V.24 is the ISDN network terminating unit at subscriber´s side (NTBA) with
two independent analog interfaces and an additional V.24 data interface that enables direct

connection of PCs. The two ISDN interfaces (S/T interfaces) allow direct connection of your
ISDN-capable terminals. Apart from this, it is possible to link to the NT1+2a/b+V.24 up to
eight ISDN terminals by establishing an ISDN S bus. If you have at your disposal analog
terminals, for example telephones, fax devices, modems or answering machines, you can
connect them directly to the analog interfaces at the NT1+2a/b+V.24. Your existing analog
devices are now able to provide you with a wide range of ISDN services, such as Call
Forwarding, Three Party Service and Calling Line Identification Presentation. Terminal
adapters (TA) for connecting the analog terminals to the ISDN are no longer required. The
data interface V.24 integrated in the device NT1+2a/b+V.24 allows you problem-free
connection of your PC, of which you simply have to link the network termination to a free
COM interface. Using the software delivered you can open the door to a variety of
application fields, for instance internet, E-mail or computer-based fax transmission.

Start new firmware

This command starts new firmware previously stored in the NT1+2a/b+V.24.
The firmware stored in the upper part of the flash memory will be loaded into the executable
part of the FlashProm and started.
Starting includes a hardware reset of the NT1+2a/b+V.24.
Note:

If new functionality has been added, your configuration stored last may be lost.

LOAD

Load stored parameter setting

All parameters stored in non-volatile RAM will be loaded.
QUIT, EXIT, GO


Activate parameter changes

Activates the actual parameter settings and leaves the configurator (without storing the
parameter in non-volatile memory).
RESET
U

~

B1

B2

NT1+2a/b+V.24

Reset NT1+2a/b+V.24

Resets the whole functionality of the NT1+2a/b+V.24 by a forced hardware reset (like
Power off / on).
SAVE

st

Network 230 V~

1 analog
interface

ISDN
U interface


2 analog
interface

nd

Store parameter changes

Stores the actual set of parameters in non-volatile memory.
SBUSCONFIG

Bus type configuration

Carries out configuration of S/T-bus type.
Internet

0:
1:
S bus for up to 8 ISDN terminals

Short passive bus
Point-to-point/extended bus

V.24 data interface

Figure 1: View of the NT1+2a/b+V.24

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB



NT1+2a/b+V.24
D.6

NT1+Configuration commands

DEFA

Default settings

Sets up factory default parameter setting.
DEFA 0:
DEFA 1:

Setup all parameters concerning data port
Setup all parameters including ISDN protocol and MSN settings.

EMERGENCY

Emergency Handling
(Setting of emergency allowance/priority interface)

In emergency mode only that interface is available that has been given priority. The other
interfaces are disabled.
When assigning emergency allowance to the chosen S/T interface, please keep in mind that
on S bus only one ISDN-terminal shall be activated as emergency terminal (see also
operating instructions for the ISDN terminal).
EMERGENCY=0
EMERGENCY=1

EMERGENCY=2
EMERGENCY=3

S/T is emergency interface
a/b1 is emergency interface
a/b2 is emergency interface
a/b1 or a/b2 is emergency interface (dynamic)

NT1+2a/b+V.24
1.2

The NT1+2a/b+V.24 in use

The user of the ELCON NT1+2a/b+V.24 can dispose of three different interface types
designed for connection of a variety of terminals. These are:
•
1. the S/T interface
•
2. both a/b interfaces
•
3. the data interface V.24 (RS232)
The S/T interface offers connection of two digital ISDN terminals via RJ45 connectors.
Apart from this, you can establish an S bus, thus linking up to eight digital ISDN terminals
with the NT1+2a/b+V.24, whereby four of these terminals can be powered at the same time
from the NT1+2a/b+V.24 via S bus.
With help of the RJ 11 plug connector, one analog terminal can be directly connected to each
of both a/b interfaces. Besides, establishing a hard-wired connection is also possible at the
analog interfaces.
The data interface V.24 (RS232) allows direct connection of personal computers via their
COM interface. For establishing a data transmission line, a 9-pole SUB D-cable is used that

is linked at one side with a free COM interface at the computer, and at the other – with the
NT1+2a/b+V.24. For connection with a 25-pole SUB D COM port at the computer, an
adapter DB 9 - DB 25 has to be used.
The figure below shows some application fields of the NT1+2a/b+V.24.
analog

digital

(The dynamic allocation of emergency activates the
a/b interface which is the first to receive the incoming
call, resp. to start the outgoing call. The other a/b
interface is switched-off.)
FWLOAD

Load new firmware

This command loads new firmware into the NT1+2a/b+V.24 without starting.
The firmware will be stored into the unused upper part of the flash memory. During the
uploading procedure the NT is working normally.
DECT

a/b1

Figure 2: Sample
application
38

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

a/b2


V.24

S/T

NT1+2a/b+V.24

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

3


NT1+2a/b+V.24
1.3

System prerequisites for installation of the NT1+2a/b+V.24

To offer usage of the whole range of services provided by the NT1+2a/b+V.24, the
following conditions should be fulfilled:
•
•

•
•
•

For local power supply, an appropriate 230 VAC mains connection is required.
For connection to the ISDN you need an ISDN subscriber line (U) with line code
2B1Q and transfer protocol Euro ISDN DSS 1, provided by your
telecommunications network operator.

Regarding the configuration of your NT1+2a/b+V.24, please ask your
telecommunications network operator.
Only such devices that will meet the electric safety requirements according to EN
60950 and that are marked with the CE symbol shall be connected to the interfaces
of the NT1+2a/b+V.24.
The terminals shall be equipped with appropriate connectors, otherwise adequate
adapters can be used.
The terminals shall be connected only to the corresponding interfaces that have
been designed for them.

NT1+2a/b+V.24
Please execute the following steps to update the NT1+2a/b+V.24 locally:
•
Get a new software release for the NT1+2a/b+V.24 from your supplier and copy it
to your PC.
•
Start a terminal emulation on your PC with the capability to run an X-MODEM
file transfer (i.e. HyperTerminal).
•
Enter the AT command “AT**FWLOAD“.
•
Wait for end of erasing the Flash-EPROM and the prompt to start your XMODEM transfer.
•
Start the 1kX-MODEM file transfer (send file or upload) by selecting the Transfer
/ Send File menu point in your terminal emulation and select the new software.
•
After completion you will get the information whether the software update ended
successfully or erroneously.
•
Give the NT1+2a/b+V.24 about 20 seconds to activate the new software.

•
Due to new functionality, the configuration setting stored last may be lost, please
check this before using the device. To set factory default values please use the
command "AT&F1".
Note:

Using the data interface V.24 requires below given additional conditions:
•
•
•
•
•
•

IBM-compatible computer running at a clock frequency of > 75 MHz
Operating memory 16 Mbyte
Free hard disc memory 50 Mbyte
CD-ROM disc drive
Operating system Windows `95 or Windows `98
Free serial interface (COM- Port) with interface module UART 16550 (Data
transfer rate > 115 kbps; better > 230 kbps)

Most of the personal computers manufactured in 1996 are already equipped with the
required serial interface module. In case of questions or problems related to this topic, please
contact the manufacturer or seller of your computer.

Note:

D.5


Due to an error it may happen that no firmware is active within the NT1. This will
be indicated by flashing of the LEDs L1, L2, B1, B2 (Bootloader active). To store
a new firmware correctly, you have to enter the command AT**FLASH and to load
a firmware using the XMODEM protocol as described above.
After altering one of the profile values marked by (#1) you have to enter the
additional commands SAVE and GO. This is necessary to save and activate these
new parameters.

List of NT1+Configurator commands (Analog port AT commands)

AB/1.APLUGSWITCH
AB/2.APLUGSWITCH

Enable plug switching

After going on hook the line will not be disconnected for the time adjusted in
APLUGSWITCHTIME. This makes it possible to change the analog devices.
AB/<n>.APLUGSWITCH=1
AB/<n>.APLUGSWITCH=0
AB/1.APLUGSWITCHTIME
AB/2.APLUGSWITCHTIME

Enable plug switching
Disable plug switching.
Plug switching time

AB/<n>.APLUGSWITCHTIME=1

4


Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

Plug switching time
The value shall be entered in 50 ms steps.

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

37


NT1+2a/b+V.24
Note:
If you are not sure, in which format the calling number will be presented with an
incoming call, please use the command ATV2 to identify the format of the calling number in
the RING message. This number can be entered into the ACCTAB.

D.3

Subaddressing

With outgoing and incoming calls the transmission of subaddresses can be performed using
the ISDN supplementary service SUB. The subaddress is transmitted transparently from the
calling party to the called party before the B-channel connection is established.
Please note, that this ISDN service typically has to be enabled by the ISDN service provider
and may be charged additionally.
The subaddress is separated from the called number by a slash “/“.

NT1+2a/b+V.24
1.4


Safety precautions

Before installing and commissioning the NT1+2a/b+V.24, please read these operating
instructions thoroughly. These instructions will help you to use the device to its full extent
and to avoid damage resulting from improper application.
•
•
•
•
•

The functionality Subaddressing can be used with the dialling procedures AT-command set,
PAD X.3 and automatic call.

•

Examples:

•
•

ATDisdnnumber[/subaddr]
isdnnumber
Dialling called party number
subaddr
Called subaddress
RING [<rn>[/subaddr]]
CONNECT [<rn>[/subaddr]]
rn
Calling party number

subaddr
Calling party subaddress

The NT1+2a/b+V.24 has been manufactured according to state-of-the-art technology
and corresponds to well-accepted safety regulations.
Please make sure that the device is operated only in faultless condition and that these
operating instructions are observed.
Only authorized specialists are allowed to operate the NT1+2a/b+V.24.
After connecting the device, install the right supply voltage (→ Technical data)!
The NT1+2a/b+V.24 has no individual component for interrupting the supply
voltage. The device must be placed within 1.5 meters from the mains socket.
Care should be taken when installing the power supply and the connection cables to
avoid the risk of accidents (such as tripping over the cables).
The device shall be operated only within a temperature range from 0 °C to +40 °C.
In case of device failure please contact the manufacturer or the representative in your
vicinity.

Apart from these safety precautions, installation and operation instructions are also given in
the respective chapters.
We reserve the right to modify the contents of these operating instructions.

The own subaddress (calling subbaddress) can be setup using the configuration command
SUB.
Note:

D.4

The subaddress can be entered additionally into all tables that contain
ISDN numbers for dialling or checking an ISDN address.


Local software update

The NT1+2a/b+V.24 uses a Flash-EPROM for software updates to store the operational
software. This software can be updated from a locally connected PC via the COM port or via
a remote configuration connection.

36

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

5


NT1+2a/b+V.24
2
2.1

Mounting
Scope of delivery
•
•
•
•
•
•
•

2.2


NT1+2a/b+V.24
Z

NT1+2a/b+V.24 – ISDN network terminating unit with two analog interfaces and
one data interface V.24 (RS232)
Mounting accessories (dowels, screws, drilling template)
Mounting and operating instruction
Software for configuration of the NT1+2a/b+V.24 (optional)
Floppy disk with installation software Windows 95/98 and Windows NT (optional)
V.24 Standard modem cable SUB-D 9-pole (1:1) (optional)
V.24 COM port adapter DB 9 - DB 25 (optional)

Selection of mounting site / Fastening the device NT1+2a/b+V.24

The NT1+2a/b+V.24 is designed for wall mounting. Select an appropriate mounting spot for
the device near to the U-subscriber line from your network operator. Apart from this, the
device has to be installed near the 230 V mains socket, since the power plug represents the
link to the supply mains. Make sure that the power plug is always easy accessible. The cable
length is 1.5 m. Please make sure that there are no other concealed supply lines (e.g. power,
water, gas, telecommunication supply lines) and that the device is not exposed to direct
insolation. Apart from this, the device shall be protected from moisture.

The active configuration will be reset to the stored configuration.
This must be the last command in an AT command string.
ATZ

D.2

Important note:


After mounting and cabling the device do not forget to replace the cover
again. Operating the device without protective cover is not allowed, due
to the danger of voltage-carrying parts being contacted by mistake.

ISDN access control

Using these commands you can setup a table, to allow only definite callers to get a
connection to the NT1.
If this list is empty (default) or one entry is set to star (*), any incoming call is allowed.
Every incoming call that does not fit to one of the entries of ACCTAB will be ignored. The
received calling party number is compared to every entry beginning at the last digit and is
stopped when the shorter number is completely compared.
acctabx nn/ss
acctabx acctabx *
acctabx
acctab

The hints required for mounting the device are to be found directly on the drilling template.
Due to the chosen mounting holes it may be necessary to remove the cover. Before removing
the cover, make sure that the circuit is dead. To remove the cover, press the locking pins on
both sides of the device inwards and at the same time remove the cover. In case you want to
implement hardwiring of your terminals, connect the cables before closing the device.
Mounting of the cover shall be performed in reverse way, slipping on the upper cover part
until the locking pins will audibly snap into place.

Load stored settings

set entry number x to ISDN number nn and subaddress ss
clear entry number x

allow all incoming calls to be accepted
show entry number x
show all entries

Maximum number of entries = 5; x = 1..5
Maximum length of ISDN number = 20 digits
Maximum length of subaddress = 20 digits
The ISDN number nn can contain wildcards:
* : represents one or more digits
? : represents exactly one digit
Note:

If a subaddress is set, the received calling subaddress must be identical with
the subaddress that has been set.

Examples:

acctab1 1234567890
acctab2 *456*
acctab3 ?2345678??
acctab2 *1234/987
acctab3 *
acctab3 -

6

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

accept only specified number
accept all numbers with 456 somewhere in the middle

accept all number with 2345678 in the middle
peceeded by one digit and followed by two digits.
accept all numbers that end with 1234 and have the
subaddress 987
accept all incoming calls without subaddress
clear entry no. 3

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

35


NT1+2a/b+V.24
H

Disconnect

Disconnects existing ISDN data connection after issuing the Escape sequence.
ATH
I

Display version information

NT1+2a/b+V.24
2.3

Connection facilities and realization of cable coupling

Below figure shows the connecting sockets of the NT1+2a/b+V.24 with the corresponding
designation. At the cable bushing points the inside device is equipped with terminal blocks

for hard wiring (except for the power supply connection). These terminal blocks are
accessible after opening the casing cover.
~

U

S/T

S/T

a/b1

a/b2

V.24

Displays different information about version number and settings:
ATI
ATI1
ATI2
ATI3
ATI4
ATI5
ATI6
ATI9
ATI99
O

Returns the "Modem"-type; name of the terminal adapter
(“NT1+2a/b+V.24“)

Returns internal checksum (“64“)
Returns “OK“
Returns version string: "NT1 5.xy.z0"
Returns manufacturer´s name: "ELCON Systemtechnik GmbH"
Returns ISDN-selected protocol: "0 - DSS1"
Returns copyright string: "(c) Copyright ELCON Systemtechnik
GmbH"
Returns plug-and-play ID string
Returns software creation date
Return to online state

If the NT1+2a/b+V.24 is in the command mode after issuing an escape sequence out of an
existing connection, ATO brings the NT1+2a/b+V.24 back to the data phase. This must be
the last command in AT string.
ATO
&W

Store active configuration

The active configuration will be stored in non-volatile memory.
AT&W

34

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

S/T interface RJ 45
ISDN U interface
Supply cord


Analog interfaces RJ 11
Hard-wired analog ports

Data interface V.24

Hard-wired S/T interface

Figure 3: Connection facilities
As shown in above figure, three different types of interfaces for terminal connection are
available to the user of the ELCON NT1+2a/b+V.24. These are:
•
the S/T interface
•
both a/b interfaces
•
the data interface V.24 (RS232)
The S/T interface offers connection of two digital ISDN terminals via RJ45 connectors.
Apart from this, you can establish an S bus, thus linking up to eight digital ISDN terminals
with the NT1+2a/b+V.24, whereby four of these terminals can be powered at the same time
from the NT1+2a/b+V.24 via S bus. When establishing the S bus, keep in mind to terminate
the bus by terminating resistors (100 Ω) (see below scheme). For establishing the S bus in
Y-configuration, both ends of the bus shall be terminated by terminating resistors.
The exact pin assignment of the RJ45 connectors is described in Annex A.
Furthermore, it shall be mentioned that the S/T interface, resp. the S bus, can be operated in
two different configurations: The first configuration type is the so-called „short passive bus“,
and the other – the „extended passive bus“ with the „point-to-point“ configuration. The
transmission range that can be reached with either of above mentioned variants, as well as
the form of the two bus types, are presented in below figure.
Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB


7


NT1+2a/b+V.24

NT1+2a/b+V.24
D

≤ 220 m

NT1+2a/b+V.24
S bus

T
R

< 10 m

TE

TE

up to
8 TE‘s

TE

T
R


Dials the number (D for Dial). The dial modifiers "W", ">", "T", ";", "@" can be freely
inserted in the dial string; they have no influence on the dial procedure of the
NT1+2a/b+V.24.
This must be the last command in an AT command string.
Any character input during the NT1 dialling procedure will cancel the dialling.

TE

ATD<CALLEDnumber>[/<subaddr>]

Figure 4: Short passive bus

CALLEDnumber: ISDN call number for a dialled B channel connection or
X.25 number for X.31 D channel
subaddr
dialled subaddress

NT1+2a/b+V.24
S bus

T
R

< 10 m

TE

TE

up to

8 TE‘s

TE

Initiate an outgoing call

T
R

ATDL
Note 1:
Note 2:

Dial the last dialled number
To setup the own subaddress see configuration command SUB.
Adding an "e" to CALLEDnumber indicates that a connection to the
internal remote access of a NT1+2a/b+V.24 shall be performed, the
protocol X.75 (ATB10) has to be used.

TE

Figure 5: Y configuration
≤ 500 m ... 1000 m

E

≤ 25 m ... 50 m

NT1+2a/b+V.24
S bus


T
R

< 10 m

TE

TE

up to
4 TE‘s

≤ 850 m ... 1700 m (< 6 dB attenuation at 96 kHz)

S bus
< 10 m

ATE
ATE1
&F

No local echo
Local echo on in command phase (default)
Load factory defaults

Factory default will be loaded, ISDN protocol setting and MSN´s will not be overwritten.
(For storing in non-volatile memory please use the command AT&W).

Figure 6: Extended passive bus


T
R

Selects the local echo in command mode.

T
R

TE

Local echo

NT1+2a/b+V.24
T
R

AT&F
AT&F1

Setup all parameters concerning data port
Setup all parameters including ISDN protocol and MSN settings.

TE
Figure 7: Point-to-point configuration
8

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB


33


NT1+2a/b+V.24
The parameter settings of the NT1+2a/b+V.24 obtained when using the AT commands can
be permanently stored (AT&W) and are not lost when resetting or by leaving the AT
command mode.
To enter the AT command mode during an active data connection, use the following
sequence ("Escape sequence"):
at least 1 sec pause <+><+><+> 1 sec pause
The time gap between all three plus signs shall not exceed 1 sec.
The escape sequence is transmitted transparently to the remote device.
Supported ISDN and NT specific AT commands
A/

Repeat last command string

This command repeats the commands of the last entered command string.
Note:
No prefix AT is required.
A/
A

Accept incoming calls

With this command you can accept an incoming call if automatic call acceptance is not set
(Register S0 = 0). An incoming call is displayed by the message “RING“ or the code “2“.
This must be the last command in an AT command sequence.


NT1+2a/b+V.24
The wire pairs, responsible for „transmitting“ and „receiving“, are electrically terminated
(with 100 Ω each) by appropriate terminating resistors → TR of the S bus. Unlike the Yconfiguration of the short passive bus, the terminating resistors of the first S-bus end are
accommodated inside the NT1+2a/b+V.24. With the Y-configuration of the short passive
bus, the device-internal terminating resistors have to be switched off by means of DIP
switches (Figure 9). The terminating resistors at the second end of the S bus are preferably
installed in the last (most distant from the NT1+2a/b+V.24) junction socket or, alternatively,
plugged in one of the RJ 45 jacks at the last junction socket.
With help of RJ 11 plug connector, one analog terminal can be directly connected to each of
both a/b interfaces. Besides, establishing a hard-wired connection is also possible at the
analog interfaces. However, the length of such a hard-wired line shall not exceed 250 m.
You will find the exact pin assignment of the RJ 11 connectors in Annex B.
The data interface V.24 (RS232) allows direct connection of personal computers via their
COM interface. For establishing a data transmission a 9-pole SUB D-cable is used that is
linked at one side with a free COM interface at the computer, and at the other – with the
NT1+2a/b+V.24. A „1 to 1“ modem cable is recommended to be used as data transmission
cable. The cable shall be fixed to the devices by appropriate screws and protected from
tensile loads. The pin assignment at the connectors is shown in the Annex C.
Attention:

Cable coupling
•

ATA

•
B

Set B-channel protocol


Transmission protocol for data transfer

•

ATB
protocol no.
0
4
10
13
31
32

B-channel protocol
V.110 asynchronous
HDSL transparent
X.75 SLP
V.120 async
MLPPP

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The cables for connecting the terminals to the NT1+2a/b+V.24 interfaces
shall be protected against overvoltage, since this may cause damage to the
terminals connected or the NT1+2a/b+V.24!

•
•

Connect the ISDN cable of your network operator to the U interface at your

NT1+2a/b+V.24.
Now connect your analog terminals. For connection you can either plug-in the
RJ11-plugs into the determined jacks (a/b1 and a/b2) or establish a hard-wire
connection for your analog terminals. For this you have to remove the cover (see
chapter 2.2).
Your ISDN terminals can be connected to the corresponding jacks (S/T) by means
of the RJ45-plugs. Alternatively, you can establish an S bus to which the terminals
can be linked.
Now plug-in your mains plug in a 230 VAC power supply socket. Your
NT1+2a/b+V.24 with all terminals connected is now ready for operation, offering
the manufacturer´s default settings.
If you want, you can connect your PC with the NT1+2a/b+V.24 as described
above.

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9


NT1+2a/b+V.24
2.4

Configuration of DIP switches

3

4

Upon delivery the DIP switches have default setting as shown below. Except for
disconnecting of the termination resistors, the DIP settings shall not be changed.

NT1+2a/b+V.24
Annex D

AT command set for computer access

The settings of the NT1+2a/b+V.24 for the V.24 interface, the a/b interfaces and the S/T
interface are called configuration. The NT1+2a/b+V.24 is delivered with a set of pre-set
values. In the following section it will be shown how, by using the configuration commands,
you can examine the configuration of the NT1+2a/b+V.24 and, if necessary, change it. The
values can be stored in non-volatile memory; this means they will remain unchanged even if
the power supply is disconnected.

2

100 ohms bus termination resistors (default setting)

1

ON

You can configure the NT1+2a/b+V.24 in the following ways:
•
by using the AT command set entered by the locally connected PC.
•
by using the configuration software which is delivered with your NT1+2a/b+V.24

Figure 8: DIP switches (default setting)

100 ohms bus termination resistors switched off

(NT1+2a/b+V.24 without internal termination resistors)

1

ON

2

3

4

D.1

Figure 9: DIP switches (termination resistors switched off)

2.5

Procedure for demounting the NT1+2a/b+V.24

For demounting the NT1+2a/b+V.24 first disconnect all cables, beginning with the power
supply cord. If your terminals are hard wired, you have to remove the cover. Now the device
can be taken from the wall. It may be necessary to remove the cover as well in order to get
access to the screws to be released.

10

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AT command set

All parameters can be changed by using an extended AT command set described in this
chapter.
Please check if the factory setting will fit with your environment. The factory setting is
described (highlighted) in the parameter list shown in chapter "AT command set" (see
below).
If you want to have another configuration than the factory default settings, please execute the
following:
•
Connect the NT1+2a/b+V.24 to the ISDN interface
•
Connect the PC´s COM port to the V.24 interface of the NT1+2a/b+V.24.
•
Connect the power supply to the mains socket.
•
Start a terminal emulation on your PC, please verify that the baudrate setting of the
terminal emulation fits those of the NT1+2a/b+V.24.
•
Set up the parameter of the NT1+2a/b+V.24 from the terminal emulation and save
the parameter using the AT command set.
Example:
To change the used B channel protocol to X.75 please enter the
following commands:
ATB10<↵>
(set protocol to X.75)
AT&W<↵>
(save the new configuration)
• Leave your terminal emulation and start your application program.
With the exception of the command A/ (Repeat command), all commands begin with the
prefix AT and end with <↵>. Corrections in a command string are done with

<BACKSPACE>. A command line has a maximum of 80 characters. The command line is
automatically cancelled by longer input. Blanks are ignored, capital/small letters are not
significant.

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31


NT1+2a/b+V.24
Annex A

Pin assignment of the RJ 45 jacks at S/T interface

Pin

Transmission function

1
2
3
4
5
6
7
8

not used
not used
Receive + from terminal equipment (Rx+)

Transmit + to terminal equipment (Tx+)
Transmit - to terminal equipment (Tx-)
Receive - from terminal equipment (Rx-)
not used
not used

Annex B

Transmission function

1
2
3
4
5
6

not used
not used
a
b
not used
not used

3
3.1

12345678

3.2

123456

Pin assignment at data interface V.24 (RS232)

The data interface V.24 (RS232) on the NT1+2a/b+V.24 is conducted out of the device via a
9-pole female SUB D connector. Shield is necessary if cable length exceeds 2 m.
Attention: Max. cable length < 15 m, for transmission rates higher than 19.200 bps < 2 m.
Pin
1
2
3
4
5
6
7
8
9

30

ITU-T
109
103
104
108
102
107
105
106

125

EIA
DCD
TD
RD
DTR
GND
DSR
RTS
CTS
RI

I/O
O
O
I
I
--O
I
O
O

Signal
Detect data carrier
Transmit data
Receive data
Data terminal ready
Signal ground
Data set ready

Request to send
Clear to send
Ring indicator

1

9

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State upon delivery

When putting the device into operation for the first time, the following parameters have been
preset:
•
Short passive bus terminated by 100 Ω
•
MSN 1, 2 and 3 are empty
•
The supplementary services are preset

3.3

Annex C

Operation of the NT1+2a/b+V.24
Initial commissioning

After connection of the mains voltage, the U interface and the terminals the NT1+2a/b+V.24
with default configuration is ready for operation (Plug & Phone-installation). Due to the

state upon delivery you can already make use of your terminals (Power supply via U
interface is required in order to enable the device).

Pin assignment of the RJ 11 jacks at the analog interfaces

Pin

NT1+2a/b+V.24

Configuration of the analog ports via DTMF

The NT1+2a/b+V.24 supports the two analog subscriber interfaces a/b1 and a/b2. Both
subscriber interfaces are of identical functionality and can be used independently of each
other. In emergency mode (failure of 230 V mains power supply) only one user interface
(a/b1, a/b2 or S/T) can be used, the other two interfaces are disabled then. This is necessary,
since in emergency mode the NT1+2a/b+V.24 is powered via the exchange office and due to
the fact that the public telephone network can provide only restricted electric power.
Using an analogue telephone capable of DTMF dialling you can modify the configuration of
the relevant analog interface as described below. Please note that the usage of some services
require that your telephone is equipped with a so-called R-Flash-key (60 ms ... 500 ms).
Note:
Any settings you implement at an a/b port will take effect only at that very port!
Entering the access code
It is recommended to use a phone with display in order to enable to follow the entered
character sequence. After the handset has been picked up and as long as the call connected
signal sounds, the access code for programming can be entered.
The sequence to enter the configuration mode is: #97
After pressing the ”#” your connection to the exchange is disconnected and the tone
disappears.
This tone will appear:

•
after each complete configuration of a parameter
•
after a user break with ”*”
•
after you made a wrong or not permitted input a sequence of 4 short tones will
generate
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11


NT1+2a/b+V.24
When you hear this tone, you will always be in the ”Root” of configuration. Now you can set
another point with the same call. A new input of # 97 is not necessary in this case.
Putting the handset On-hook quits the programming mode.
All settings described in the following can now be made.
Call number (MSN)
Up to three call numbers (MSN) can be assigned to each access. Each call number may
consist of max. 18 digits. If an incoming call contains a number set both at an S/T and an a/b
access, all telephones having this call number will ring. The person removing the handset
first will receive the call. If both a/b terminals have the same call numbers, both a/b
terminals will ring.
For outgoing calls, the first call number is entered.
Default: If no number has been programmed, all incoming calls will be accepted by
a/b Port 1 and a/b Port 2.
Input
0#
[1,2,3]#

Example
#97 0#
1#

[0..9]...#

735141#

Comment
Call number mode
Selection of one of the 3 call numbers of
the access
Call number to be set

Program example: #97 0#1#735141#
Every MSN can be deleted with the following sequence: #97 0# [1, 2, 3]# #

NT1+2a/b+V.24
V.24 data interface
functional
electric
Baud rate
Data format
Data flow control
Transfer mode
Physical connection

V.24
V.28
1200 - 230400 bps in asynchronous mode

8 data bits, no parity, 1 stop bit
7 data bits, even/odd parity, 1 stop bit
RTS/CTS or XON/XOFF
full-duplex mode, half-duplex mode
9- pole SUB-D connector as female junction element

Mains power pack
Nominal voltage
Voltage range
Power consumption
Standby mode

230 V A.C., 50 Hz
196 V ... 253 V; 48 Hz ... 52 Hz
max. 20 VA locally supplied
approx. 7 W

Casing and ambient temperatures
Casing dimensions
Colour of casing
Weight of the device
Transport / storage
Operating

250 mm × 175 mm × 42 mm
white
900 g
-25°C ... +55°C
0°C ... +55°C

Type of Terminal Equipment (TE)
This setting determines the behaviour of the 3 call numbers at one a/b access for the types of
incoming calls. Further it determines the setting for call number 1 to mark the type of
outgoing calls. You can set the modes "Telephony" or "Fax" (analog) or ”Modem”. The
setting Telephony rejects calls of type Fax and the setting Fax the calls of type Telephony.
Default: Telephony
Input
1#
[0,1,2]#

12

Example
#97 1#
0#

Comment
TE-Type mode
Mode

0 .. Telephony
1 .. Fax (analog)
2 .. modem

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29

NT1+2a/b+V.24
5.2

Short passive bus or point to point / extended passive bus selection

Technical data

You can set the S bus configuration with the following procedure.

U interface
Transmission method
Channel structure
Line code
Baud rate
Net data rate
Transmission range
Max. power consumption

2-wire transmission using echo compensation method
2B+D, synchronization and service data
2B1Q
80 kBd
144 kbps (2 x 64 kbps + 16 kbps)
4.6 km with 0.4 mm twin-wire copper cable
9 km with 0.6 mm twin-wire copper cable
approx. 1.7 W

Power supply concept
Wattage

Default: Short passive bus
Input
2#
[0,1]#

Example
#97 2#
1#

Comment
S bus configurator
0
short passive bus
1
extended passive bus /
point to point

Emergency Terminal

S/T interface
Transmission method
Channel structure
Line code
Total bit rate
Useful bit rate
Bus configuration

NT1+2a/b+V.24

4-wire duplex transmission
2B+D, synchronization and monitoring
AMI (modified)
192 kbps
144 kbps
- Short passive bus, Range approx. 220 m
- Point-to-point, Range approx. 1100 m
or extended passive bus
according to ITU-I.430
≤ 4.5 W in standard operation mode
≤ 410 mW in emergency mode

In case of local power failure, the NT1+2a/b+V.24 is powered from the exchange. In this
case only the access which has been defined as the Emergency Terminal will be available.
Default: a/b Port 1
Input
3#
[0,1,2,3]#

Example
#97 3#
1#

Comment
Emergency mode
Restricted powering
0 .. S/T
1 .. a/b Port 1
2 .. a/b Port 2
3 .. a/b Port 1 or a/b Port 2 (dynamic)

a/b interfaces (country-specific / here: for use in Poland)
Supply
Supply current
Line resistance
a/b voltage in idle state

Global Call
> 20 mA
> 600 Ω
> 40 V

Ringing signal parameters
Ringing voltage
sine-shaped, > 40 Vrms on 3 kΩ + 10 µF
Ringing frequency
25 Hz ± 1.25 Hz
Metering pulse parameters
Level
> 400 mV
Frequency
16 kHz ± 200 Hz

The global call must be supported from the exchange. It allows you to call one phone
number and every terminal with the same HLC will be ringing.
This is a service for a/b Ports.
Default: ON
Input
5#
[0,1]#

Example
#97 5#
0#

Comment
Mode Global Call
0 .. OFF Global Call not allowed
1 .. ON Global Call allowed

Low-frequency characteristics
Input impedance
600 Ω
Output level
- 7 dBr
Input level
0 dBr
28

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13


NT1+2a/b+V.24

NT1+2a/b+V.24

Protocol

→
→
→
→
→
→

This point is to switch between Functional and Keypad Protocol for the supplementary
services CFU, CFB, CFNR.
As Keypad Protocol varies in different switches, Functional Protocol (FUNCT)should be
used.
Default: Functional Protocol
Input
7#
[0,1]#

Example
#97 7#
1#

Comment
Protocol
0
Functional Protocol
1
Keypad Protocol

•

•

Distinctive ringing
Your NT1+2a/b+V.24 can store up to three telephone numbers for each a/b connector. It is
possible to arrange a different ringing sequence for each of the three numbers. So it is
possible, for example, to configure a public number at MSN 1 and a private number at MSN
2 of a/b1. (Both numbers must be subscribed at your provider of course). It is now up to you
to ignore public and accept private calls. You can distinguish between them by means of the
ringing signal.
Default: normal ringing cadence signal (1250 ms signal, 3750 ms pause)
Input
9#
[0,1]#

Special ringing
sequence
for MSN 1
for MSN 2
for MSN 3

Example
#97 9#
1#

Comment
Distinctive ringing
0
normal ringing cadence
1
distinctive ringing ON

signal

pause

signal

pause

500 ms ± 5 %
700 ms ± 5 %
300 ms ± 5 %

200 ms ± 5 %
200 ms ± 5 %
200 ms ± 5 %

500 ms ± 5 %
300 ms ± 5 %
700 ms ± 5 %

3600 ms ± 20%
3600 ms ± 20%
3600 ms ± 20%

Call Waiting Enable
This setting allows, resp. restricts the Call Waiting function. Please note that the settings take
effect only for the port from which they have been implemented. For switching between two
calls please use the keying sequence R2.

14

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•
•
•
•
•
•
•
•
•
•
•

Call Hold / Call Back / Broker’s Call
Call Waiting and Call Waiting Protection (CW)
Call Forwarding Unconditional (CFU)
Call Forwarding Busy (CFB)
Call Forwarding No Reply (CFNR)
Hotline function (automatical dialling of a programmed number upon removing
the receiver)
→ Malicious Call Identification (MCID)
→ Terminal Portability (TP)
At the ISDN-S/T-interface you can make use of the entire ISDN user facilities that are
supported by the ISDN.
The data interface V.24 offers the following facilities:
→ Digital data transfer at 64 kbps
→ Digital data transfer at 128 kbps and channel trunking of 2 B-channels

→ Data transfer rate at the serial interface up to 230 kBd
→ Application of data transfer protocols PPP, MLPPP, V.120
→ „Call Bumping“-function for clearing a speech channel in case of data
transmission using channel trunking if you wish to call to another subscriber
(optional)
→ Bit rate adaptation according to V.120
→ Autobauding at the serial interface
→ Support of data transfer applications such as Internet, E-Mail, Net Meeting, Data
transfer and Mailbox
Via the analog interfaces the NT1+2a/b+V.24 can be configured by means of tone
dialling (DTMF)
Direct PC connection via serial COM interface
„Plug & Play“ installation of the NT1+2a/b+V.24 (RS232) at the PC
Using the specific configuration software (optional) the NT1+2a/b+V.24 can be
configured via data interface V.24 (RS232) of a normal computer
Local firmware updating of the device is possible via data interface V.24
Both firmware and configuration of the NT1+2a/b+V.24 can be modified as well by the
network operator using access via ISDN
Remote check and diagnosis with help of ELCON software (optional)
Electric safety according to EN 60950
Proenvironmental due to energy-saving switched-mode power supply
NT1+2a/b+V.24 meets all relevant ETSI specifications
NT1+2a/b+V.24 meets the requiremenets of the CE symbol

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27


NT1+2a/b+V.24

4.6

Configuration for AOL/CompuServe

You need a contract with AOL/CompuServe to access the AOL/CompuServe network via
ISDN. To configure the NT1+2a/b+V.24 you need the following information from
AOL/CompuServe:
•
ISDN access number
•
Layer two protocol, usually the protocol-type X.75 by selecting Modem
NT1+2a/b+V.24 X.75. Some accesses still use B channel protocol V.120 (select
Modem NT1+2a/b+V.24 V.120).
You can use a CompuServe access by running the CIM software package. For AOL use the
AOL software.

5
5.1
•
•
•
•
•
•
•
•
•
•
•
•

•
•

26

NT1+2a/b+V.24
Default: Call waiting enable
Input
*43#
#43#
Hotline call
In case a hotline number has been programmed for a particular a/b port, then after a delay
time (default: five seconds) after removing the hearer (hook-off) the preprogrammed number
<no.> will be automatically transferred as dialling information, unless the user by then has
initiated a dialling procedure by himself. For each port you can program one hotline call.
*53*<no.>#

Technical data
Technical description

#53#

Digital U interface for hard-wired link to the Integrated Services Digital Network with
Euro-ISDN-protocol DSS 1 and line code 2B1Q
Digital S/T interface for connecting the ISDN terminals via hard-wired connections
(S bus) or with help of two RJ45 connectors
Two analog interfaces a/b 1 and a/b 2 for the connection of analog terminals via hardwired lines or one RJ11 connector per each device
Data interface V.24 (RS232) for the connection of personal computers via 9-pole SUB
D female contact
Supply cord for connection of power supply voltage 230 VAC

4 light-emitting diodes (LED) for indication of operating states
3 MSN can be programmed per each analog interface
Max. 3 simultaneous bell loads per each analog port
In case of local power failure (230 VAC) emergency power supply for one preset ISDN
or analog telephone is selectable
Configuration of ISDN S bus via DTMF or AT commands as short passive bus or as
point-to-point connection, resp. extended passive bus
Service compatibility of both analog interfaces adjustable for telephony or facsimile
mode
Application of analog terminals capable of pulse dialling or dual-tone multi-frequency
dialling (DTMF)
Spontaneous exchange access at the interfaces
Below supplementary services are partly available at the analog interfaces (some of
them are optional):
→ Calling Line Identification Presentation (CLIP)
→ Calling Line Identification Restriction (CLIR)
→ Connected Line Identification Presentation (COLP)
→ Connected Line Identification Restriction (COLR)
Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

Comment
Activation of Call waiting
Deactivation of Call waiting

Program hotline number and enable Hotline call to the
programmed number
Disabling hotline call

If you want to change the delay time, then enter the following key sequence:
*54*<time>#

Change the delay time of hotline call; <time>: delay in seconds
Default setting: 5 sec

Remarks: In case a busy tone apperas after Hotline activation, no hotline number has been
programmed. The delay time for Hotline calls must be between 1 and 30 sec, for other
programmings a busy tone will be sent by the NT.
Clearback Time Delay
This setting determines whether a signal is delayed for a period of 2 minutes after the user
has gone on-hook with an incoming call. The user can change the terminal in this period
(Terminal Portability) without disconnecting the call.
Default: OFF
Input
*74#
#74#

Comment
Activation of Clearback delay
Deactivation of Clearback delay

Metering Pulses
The subscriber can activate and deactivate the metering pulses on the analog interfaces.
Input
*89#
#89#

Comment
Activation of Advice Of Charge enabled
Deactivation of Advice Of Charge enabled

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15


NT1+2a/b+V.24

NT1+2a/b+V.24

CLIP

•

You can set the Calling Line Identification Protocol to identify the caller´s phone number.
Input
*85#
#85#

Comment
CLIP on
CLIP off

•

MSN
These parameters select the telephone number of the data port that will be used for
incoming and outgoing calls. The complete telephone number without area code,
will be supplied by the ISDN provider.
Call bumping and CHAP password
These parameter configure the behaviour when multilink PPP is used.

CLIR and COLR

Using the NT1+2a/b+V.24 with Application Software

The setting for Calling Line Identification Restriction determines the default handling for the
identification of outgoing calls. This setting applies as well to Connected Line Identification
Restriction. Like with an ISDN telephone, the first telephone number of your access is
transmitted to the exchange and displayed on the called station when you start connecting.
CLIR and COLR can be changed as follows:

To use the NT1+2a/b+V.24 with different application software and access points you have to
look for the following items:
•
Usually you need a contract with the service provider. They can help you to get an
appropriate application program that runs on a PC.
•
The service provider will also supply you with the ISDN access number to call
(has to be entered in the application program).
•
The NT1+2a/b+V.24 parameters must fit the characteristics of the access point
which are recommended in the next chapters.

Default: OFF
Input
*31#
#31#
*31*<Telephone no.>

Comment

Permanent activation of CLIR mode (CLIR on)
Deactivation of CLIR mode (CLIR off)
CLIR per call; CLIR only active for the current call

Input
*77#
#77#

Comment
Permanent activation of COLR mode (COLR on)
Deactivation of COLR mode (COLR off)

Closed User Group (CUG)
Input
*01*<group no.>#
<telephone no.>

Comment
CUG on

To access the Internet via ISDN you have to have a contract with an Internet service provider
(ISP) who runs an ISDN access. To configure the NT1+2a/b+V.24 you need the following
information from the ISP:
•
ISDN access number (to be entered at the PC program)
•
Layer two protocol, usually the protocol-type PPP by selecting Modem
NT1+2a/b+V.24 HDLC-PPP.
•
Access protocol (to be entered at the PC system software or Internet software)

Configuration under Windows 95
Reset system, parameters will not change

Call Forwarding Unconditional (CFU)
The keypad commands below can be used to instruct the exchange to divert the call to a
different calling number if certain busy states apply. Under certain circumstances, the use of
these services depends on whether they have been agreed with your service provider.

16

Configuration for Internet

To configure the Internet access software on the PC it may be necessary that you need some
additional information like TCP/IP address, user name, password etc. Please refer to the
software manual.

Hardware reset
*199*

4.5

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The configuration of the NT1+2a/b+V.24 can be dependent of the type of access the internet
provider is supporting. The following types of access are most frequently used for public
ISDN access.
• HDLC async to sync conversion
This protocol has to be set up, if the service provider uses an access point where
the protocol PPP is running.

Please ask your Internet provider for further information if need should be.
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25


NT1+2a/b+V.24
Installation (Windows NT 4.0)
1.

5.

Execute the program SETUP.EXE from the installation disk. This program leads
you through the installation.
At the end of the installation you will get information about the installed software
and modem types.
The configuration of the NT1+2a/b+V.24 will be described in the following
section.
You can skip the configuration of the NT1+2a/b+V.24 now if information is
missing. The configuration can be done later by using the NT1+2a/b+V.24
configurator.
Restart Windows to activate new settings.
Now you have to add new Modems manually. Please go to
START → SETTINGS → CONTROL PANEL → MODEMS
Select ADD and activate the button "Don´t detect my modem, I will select it from
a list".
Please choose via the DISKETTE button the path to the NT1+2a/b+V.24
installation disk and open the file "mdmstdaa.inf".
You can select the following NT1+2a/b+V.24 modems:
NT1+2a/b+V.24 HDLC

NT1+2a/b+V.24 ML-PPP
NT1+2a/b+V.24 V.120
NT1+2a/b+V.24 X.75
Please note that every modem has to be installed separately.
Select the used COM port and finish the installation procedure.

4.4

Configuration

2.

3.
4.

Using the NT1+2a/b+V.24 Configurator the configuration parameter of the NT1+2a/b+V.24
will be set up. If you do not know the correct parameter, please contact the provider of your
ISDN U Interface (telephone company).
Please make sure that the NT1+2a/b+V.24 is connected to the serial interface and power is on.
After providing the settings for the following parameter you can leave the configurator. The
NT1+2a/b+V.24 is now ready to be used with Modem applications (i.e. Microsoft Dial-Up
Networking) or CAPI-compatible application programs.
•
D-channel protocol
The ISDN D channel protocol is the most important characteristic of your ISDN
U-Interface. Different countries will support you with different D channel
protocols. Euro-ISDN (DSS1) will be used nearly all over Europe.

24

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

NT1+2a/b+V.24
Input
Å↑
*21*<C-N>#
Å↓

Comment
Unconditionally forwards all incoming calls to call number
<C-N>

Å↑
*21*<C-N>*[1,2,3]#
Å↓

Unconditionally forwards the incoming calls with the appropriate
setting MSN 1, 2 or 3 to call number <C-N>.
FUNCT

Å↑
#21#
Å↓

Cancels Unconditional Forwarding for all MSN

Å↑
#21*[1,2,3]#
Å↓

Cancels Unconditional Forwarding of incoming calls with the
appropriate setting MSN 1, 2 or 3 to call number <C-N>.
FUNCT

Call Forwarding Busy (CFB)
Note:

If call waiting service is activated, the CFB can be only used with restrictions. A
second call is signalled in your hearer by the Call Waiting tone.

Input
Å↑
*67*<C-N>#
Å↓

Comment
Conditionally forwards all incoming calls to call number <C-N> if
the called number is busy.

Å↑
*67*<C-N>*[1,2,3]#
Å↓

Conditionally forwards the incoming calls with the appropriate
setting MSN 1, 2 or 3 to call number <C-N> if the called number
is busy FUNCT

Å↑
#67#
Å↓

Cancels Call Forwarding Busy for all MSN

Å↑
#67*[1,2,3]#
Å↓

Cancels Conditional Forwarding of the incoming calls with the
appropriate setting MSN 1, 2 or 3 to call number <C-N> if the
called number is busy
FUNCT

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17


NT1+2a/b+V.24
Call Forwarding No Reply (CFNR)

NT1+2a/b+V.24
At the end of the installation you will get information about the installed software and
modem types.

Input
Å↑
*61*<C-N>#
Å↓

Comment

Forwards all incoming calls to call number <C-N> if the called
number does not answer after a time preset by the network
provider.

Å↑
*61*<C-N>*[1,2,3]#
Å↓
Å↑
#61#
Å↓

Forwards all incoming calls with the appropriate setting MSN 1, 2
or 3 to call number <C-N> if the called number does not answer
after a time preset by the network provider.
FUNCT

The configuration of the NT1+2a/b+V.24 will be described in the following section. You can
skip the configuration of the NT1+2a/b+V.24 now if information is missing. The
configuration can be done later by using the NT1+2a/b+V.24 configurator.
The installation program creates in addition a program folder with two program icons:
•
The NT1+2a/b+V.24 Configurator is the configuration program for the
NT1+2a/b+V.24.
•
Using the program UnInstallShield you can deinstall the actual software and delete
the NT1+2a/b+V.24 modems from the modem list.

Cancels Call Forwarding No Reply for all MSN

Deinstallation

Å↑
#61*[1,2,3]#
Å↓

Cancels Forwarding of incoming calls with the appropriate setting
MSN 1, 2 or 3 to call number <C-N> if the called number does not
answer after a time preset by the network provider. FUNCT

If you want to delete the software of the NT1+2a/b+V.24 from your hard disk, please start
the program UnInstallShield from the program folder NT1+2a/b+V.24.
The program deletes all installed software modules and recovers the original status of the
directory (incl. .INI system files).

4.3
3.4

Windows NT 4.0 Software Installation

Using ISDN services with analog telephones

Call-dependent services

This chapter describes the installation, configuration and usage of the NT1+2a/b+V.24 for
the operating system Windows NT 4.0.
The following components will be installed:
•
Modem driver into the modem list
•
CAPI 2.0 driver

•
Configuration program

HOLD

Preparation (Windows NT 4.0)

If you are connected with a call partner and you wish to make a short enquiry to another
partner, press

Please check the following requirements before installing the software for Windows NT 4.0:
•
PC-System with connected NT1+2a/b+V.24.
•
Access to a 3,5“ Floppy disk drive and hard disk
•
Installed Microsoft Windows NT operation system
•
Windows NT CD-ROM (Installation disks)
•
Minimum 8 MB Memory
•
Installation driver disk NT1+2a/b+V.24

To use certain services, your telephone must have an R-flash key (90 ms± 30 ms).
In the following explanations the keys to be pressed immediately in succession are separated
by a gap.

R2

If a line of your access is still free, the dial tone sounds and you can dial the
number of the second partner.

RETRIEVE
R1

18

Clears the current call and lets you return to the original call. If your original
partner has meanwhile replaced the handset, the busy signal sounds.

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23


NT1+2a/b+V.24
4
4.1

Using the NT1+2a/b+V.24 as ISDN modem
Installation procedure
•

•
•
•
•

4.2

Connect the serial port (V.24) of the NT1+2a/b+V.24 to the serial port (COM port)
of the PC by using the supported V.24 interface serial cable.
Please make sure that the COM port of the PC is not used for other purposes or by
other communication programs.
Connect the U port of the NT1+2a/b+V.24 to the U interface of the ISDN network
provider.
Connect the power supply with the NT1+2a/b+V.24 and plug it into mains.
Now the power-up sequence should appear.
The NT1+2a/b+V.24 is now ready for use, please refer to the next chapter for the
configuration to use the PC together with the NT1+2a/b+V.24.

Windows 95/98 Software Installation

This chapter describes the installation, configuration and usage of the NT1+2a/b+V.24 for
the operating system Windows 95/98. The following components will be installed:
•
Modem driver into the modem list
•
CAPI 2.0 driver
•
Configuration program
Preparation (Windows 95/98)
Please check the following requirements before installing the software for Windows 95/98:
•
PC-System with connected NT1+2a/b+V.24.
•
Access to a 3,5“ Floppy disk drive and hard disk

•
Installed Microsoft Windows 95 operation system
•
Windows 95/98 CD-ROM (Installation disks)
•
Minimum 8 MB Memory
•
Installation driver disk for NT1+2a/b+V.24

Alternating between two call partners (brokering)
If you want to change between two partners during an enquiry without clearing either of the
calls, select
R2

When the NT1+2a/b+V.24 is connected and power up while booting your PC with Windows
95, the Plug-and-Play feature of the NT1+2a/b+V.24 will get active and so Windows 95 will
request an installation disk.
If you want to install the NT1+2a/b+V.24 driver manually, execute the program
SETUP.EXE from the installation disk. This program leads you through the installation.

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

to alternate between two connected partners. If your original partner has
meanwhile replaced the handset, the call connected signal sounds, and you can
either redial or select R-Flash 2 to switch back to the previous partner.

If the partner with whom you are currently connected replaces the handset, a sequence of 5
short tones sounds to signal the second call; in this case select
R1

to change to your previous partner if your current partner replaces the handset.

CALL WAITING
If another subscriber calls you during a call, this is signalled by a call waiting tone. You can
select either
R0
R1
R2
R3

R4

to reject the waiting call, or
to clear the current call and change to the waiting call, or
to place the current call on hold position and change to the waiting call.
suppress the call waiting tone. Pressing of R3 suppresses the call waiting tone
only. The calling subscriber will furthermore receive the call tone and you have
still the opportunity to switch the incoming call.
Explicite call transfer: to connect the two other parties

Three Party Conference (3PTY)
If you want to talk with two external subscribers at the same time, you can establish a three
party conference. If one call is in hold and one call is active, you can press
R3

Installation (Windows 95/98)

22

NT1+2a/b+V.24

to invoke a Three Party Conference

If you talk with two subscribers at the same time, you can press
R2

to end a Three Party Conference

After execution of the last command you are connected to the same partner as before the
conference activation. The other one is in hold again. If one partner hooks on while
conference is active, a normal connection to the remaining subscriber is established. If you
want to end both connections, you simply have to hook on.

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19


NT1+2a/b+V.24

NT1+2a/b+V.24
3.5

LED display at the device

SUSPEND
If you want to move to another telephone during the call, enter
R*79#
Å↓

to suspend the current call. Upon keying R*79# the telephone on
the other a/b port is ringing. After removing the handset the call is
immediately directed to that phone (RESUME).
If you have another call in waiting position, a sequence of 5 tones
will remind you of this. Selecting R-Flash 1 lets you change to this
connection, replacing the handset clears the call.

RESUME
If you have parked a call you can
Å↑
*79#

Designation of the LED
not used
not used
U interface okay
Supply voltage 230 V AC okay
B channel 1 (B1) occupied *)
B channel 2 (B2) occupied *)

Designation at the device

Colour

U
~
B1
B2

green

yellow
red
red

to resume the suspended call from any telephone.

3.6

Malicious Call Identification (MCID)
If your telecommunication network supports the MCID service attribute, select
during an active connection to send an MCID signal to the
exchange, press R-Flash 9

This service supports only incoming calls.

20

LED 1
LED 2
LED 3
LED 4
LED 5
LED 6

*) The LEDs of B1 and B2 are only shining if the B channel is occupied by V.24 or a/b port.

The SUSPEND and RESUME function is also possible between analog and ISDN accesses
whereby the description of the ISDN telephone applies to this function. You must only be
sure to use a one-digit parking code.

R9

In standard version the NT1+2a/b+V.24 is equipped with four light-emitting diodes (LED).
The information is displayed on the casing front panel and is to indicate the following
operating states of the device:

Version: 3.02: Poland 2000/09/21; SW: HuV1; HW: ChLayB

Operation of the NT1+2a/b+V.24 in case of local power-supply
breakdown (emergency mode)

The NT1+2a/b+V.24 supports two analogue susbcriber ports a/b1 and a/b2 and a digital S/T
interface. Both subscriber interfaces have identical functionality and can be used
independently of each other. In emergency mode (Failure of local power supply [230 VAC])
only one interface of the NT1+2a/b+V.24 maintains functionality with only one terminal
connected to it.
This is necessary, since in emergency mode the NT1+2a/b+V.24 is fed from the exchange
and the telephone network is able to provide only a limited wattage.
The functioning interfaces in emergency mode of the NT1+2a/b+V.24 can be either an
analog interface a/b1 or a/b2 or the digital S/T interface. With the configuration of the
NT1+2a/b+V.24 it is possible to determine which of the interfaces shall maintain its
functionality in emergency mode. The configuration of this priority-given interface shall be
executed as described in chapter 3.3 resp. annex D.
It is expressly underlined, that in case of emergency operation of the NT1+2a/b+V.24 only
one terminal shall be used on that respective interface.

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21