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T1-Based Service Delivery Solutions
The concept of delivering T1s is
almost 30 years old. New technolo-
gies like HDSL have been intro-
duced but, overall, T1-based ser-
vices today are being delivered
with the same architecture used in
the 1960s. But, while the architec-
ture has remained, applications
have changed radically. The tele-
phone company introduced T1 as a
means of delivering message
trunks over copper facilities
between central offices. No one
imagined that T1 would become
the preferred vehicle for large
amounts of bandwidth to business
customers and that its growth in
those applications would exceed all

expectations.
T1-based services are expected to grow at 30 to
40 percent annually to meet the demand for
HiCap, ISDN-PRI, Frame Relay, Internet access,
PCS access and ATM services. It has become
the primary building block in corporate networks
for both high-speed applications and the consol-
idation of analog voice and data circuits. T1-
based facilities serve many medium and large
businesses and even some residential locations
with telecommuting and small office-home-
office (SOHO) applications. More than 60 per-
cent of business sites with 50 or more people
use T1s, and that percentage is growing. Fast.
Who would have thought in 1984, when T1-
based customer installations numbered in the
dozens, that, in just a few years, that number
would be millions? Today, service providers are
struggling to keep up with the demand. At the
same time, however, many are beginning to rec-
ognize the limitations of the traditional architec-
ture, and are looking for ways of:
• Improving network management
• Speeding up service delivery
• Lowering total cost
of T1-based service delivery
Evolution
Rethinking T1
A Critical
source of Revenue

Soneplex Loop Extender
Leading the
experts
In T1s original, inter-CO application,
repeatered trunks were monitored end-
to-end by central office-based switches.
These switches provided all the network
management needed, so remote con-
trol, circuit visibility, and sectionalization
capabilities were never integrated into
T1 transmission equipment. At this time,
the core network was based on T1 band-
width only; that is all carriers needed to
operate their networks.
As T1s began their migration to the local
loop, they kept their traditional architec-
ture of 220 bays and line repeaters, but
the switch-based intelligence used to
manage T1 trunks disappeared. Now the
core network has evolved into fiber-
based SONET rings and Digital Cross-
Connect Systems (DCS) machines.
Driven by burgeoning demand, most
designers looked to the past rather than
the future, and made no attempt to inte-
grate T1 management into the growing
networks,
nor did they consider the potential efficiencies
of interconnecting to the fiber-based core net-
work at speeds higher than T1. In their haste

planners and network architects didn’t consid-
er the demands of continued growth and
competition. As a consequence, T1 just kept
getting stuffed into the same, out-of-date
design. Innovations like HDSL tackled some
of the problems inherent in T1 repeatered
design, but there were still significant savings
that were unable to be tapped by sticking
with the old out-of-date 220 architecture.
Instead of evolving, the number of T1s just
kept getting bigger, not cheaper to deliver
and manage.
Carriers must rethink their T1 delivery
approach to remain competitive. A new
approach to delivering T1-based services
requires a more efficient and cost-effective
solution, one that adds profit to their bottom
line. Those who do not rethink how they are
delivering their T1s will not be in business for
long.
Delivering T1s the Old Way
T1 Delivery
of T1 delivery
the
Challenge
T1-Based Service Delivery Challenges
The T1 Delivery Experts • The T1 Delivery Ex
Soneplex Service Delivery Modules
Struggling to keep up with the explosive growth of T1-based
services, many carriers are working without a real delivery

plan. This may have worked when demand was low and com-
petition was scarce; now, it could be fatal. T1-based service
delivery is a particular challenge. Change is guaranteed.
Success depends on a long-term solution, providing:
• lower overall cost
• faster delivery
• a proactive approach to service interruption or
degradation
• total, centralized control of the network
• accommodation of change in markets and technology
Today, there are four current or emerging T1
transport technologies including:
• Traditional repeatered T1 over copper requires loop con-
ditioning, repeaters every 3000-6000 feet, and is very
labor intensive
• Optical DS2 over singlemode fiber delivers four T1s
• HDSL over copper provides symmetrical T1 via two
unconditioned pairs at distances of 12,000 feet without
repeaters, and up to 36,000 feet with HDSL Repeaters
• HDSL2, currently under development, is similar in capa-
bility to HDSL, but requires only one copper pair
A viable platform will have to address all of these, and a
lot more. ADC is leading the evolution of T1 delivery. We
can help you make the most of the opportunity.
Soneplex systems let you make strategic decisions based on
business needs, not technical limitations.
• Interface with SONET, STS-1, DS3, or DS1 backbones
• Deliver DS1 facilities anywhere on the network
• Provide services over copper or fiber from the
same chassis

Soneplex impacts all of your most critical requirements.
• A total system design addresses central office, remote
hub, customer premises, and repeater requirements
• Cost-effective connection to DCS, ADMs and other
high-speed network equipment
• Hardened design allows installation in any environment
• Full carrier-class functionality
ADC’s Soneplex system
is an intelligent loop
access platform designed
specifically for T1-based
service delivery. It is cost
effective today, yet flexible
enough to handle a wide
range of emerging services.
The Soneplex systems sup-
port T1 over fiber, and both
traditional T1 and HDSL over
copper. And ADC will be
among the first suppliers to
provide HDSL2, which will be
fully supported within the
Soneplex platform.
Soneplex already provides
integrated network manage-
ment, including remote provi-
sioning, performance monitor-
ing, and test access. Standard
TL1/X.25, SNMP and TBOS inter-
faces help keep service reliable

and costs low. And, interfaces to
today’s high-speed backbone ser-
vices, including SONET, STS-1, DS3
and DS1, increase network efficien-
cy and position the network for vir-
tually unlimited growth.
Delivering T1s the Soneplex Way
perts • The T1 Delivery Experts
Soneplex Broadband System
Efficient Architecture
Flexible Design
CENTRAL OFFICE
CUSTOMER
CUSTOMER
CUSTOMER
OPTICAL DS2
T1 REPEATER
HDSL