Integrated data
and digital voice
access through
existing network
infrastructure
NETWORK TERMINATION UNIT | Release 1.0
Alcatel’s 2902 MainStreet Network Termination Unit (NTU) delivers managed bandwidth access
of up to 2 Mb/s over existing copper pairs (HDSL) or E1 facilities. Network operators can deploy
the same platform throughout the entire network and use customized interfaces to deliver data
and voice services as required by their customers. Within a single unit, service providers can deliver
integrated data and digital voice access with a high degree of flexibility and reliability while
making use of existing network infrastructure.
By integrating E1 and HDSL technology, the 2902 MainStreet NTU offers greater equipment
flexibility for service providers and private network operators alike, and the potential for substantial
savings without the associated costs of replacing existing copper facilities.
The 2902 can be configured to deliver n*64 kb/s to 2 Mb/s voice and data services over
two regular twisted copper pairs up to 5 kilometers (3.1 miles), without requiring repeaters.
2902 MAINSTREET
The 2902 enables efficient remote management of access circuits
that have traditionally been costly for public network operators.
Once installed, the 2902 can be monitored and reconfigured
from a centralized location.
Integrated solution
The 2902 MainStreet NTU allows service providers to multiplex
data, router and LAN hub traffic into a single, versatile gateway.
It provides a flexible, cost-effective way to integrate digital voice
and data traffic from a business site onto a high speed E1 digital
link for customer access to public or private networks, or for
point-to-point operation.
The 2902 integrates HDSL without the use of any standalone
equipment. The entire network, including the HDSL/E1 transmission
facility, is managed by a common network management system.
No additional rack space or management terminals are required
for the 2902 or 3600 MainStreet Multiservice Bandwidth Manager
family of products.
HDSL technology
HDSL is becoming an increasingly popular component of access
networks today. It has become the method of choice for delivering
E1 data rates over unconditioned copper wires.
HDSL eliminates the need for mid-span repeaters and cable
pair separation for E1 transmission and access lines. It will also
compensate for individual non-ideal characteristics of the
copper loop.
Flexible interfaces
The 2902 MainStreet NTU supports HDSL, fiber optic and G.703
E1 WAN connections. The 2902 provides two E1 interfaces that
can be configured for either E1 HDB3 or E1 HDSL through the
use of plug-in link interface modules (LIMs). For example, a 2902
NTU can be connected to a PBX with the 2902 acting as a drop-
and-insert multiplexer merging the PBX and data traffic onto a
single E1 stream.
Two plug-in X.21 or V.35 data interfaces are accommodated.
The 2902 NTU can be connected to Alcatel’s 275x MainStreet
Data Termination Units (DTUs). The DTU family of products allows
remote connection of up to 5.5 kilometers (3.4 miles) over
unconditioned copper for TIA/EIA-232, X.21 and V.35 devices.
Node and network management
In common with other Alcatel products, the 2902 MainStreet NTU
can be configured using network management executive applica-
tions to provide time of day scheduling for typical services, such
as video conference booking.
All operating parameters are software configurable and a direct
connection to the 2902 can be made via either of two maintenance
ports. The Alcatel network manager provides full controlled network
management of the 2902 over the Alcatel packet-based control
packet switching system (CPSS). Performance statistics are collected
to allow for a detailed evaluation of system status at any time.
2
2902 MAINSTREET | NTU
Central Office Office
E1/HDSL
or
E1/HDB3
E1
2B1Q
V.35/X.21
Video
Teleconferencing
LAN
PBX
2902 NTU
2721 RTU 5620 NM*
3600
Multiservice Bandwidth
Manager
▼ The 2902 can aggregate PBX and data traffic over two copper pairs.
* The Alcatel 5620 Network Manager (NM), formerly the 46020 Network Manager. This product belonged to the Newbridge
family. Newbridge was acquired by Alcatel in May 2000.
2902 MAINSTREET | NTU
Feature Summary
Voice Interfaces 2902 3612 3624 3630
E&M •••
LS/GS Subscriber (LGS) •••
LS/GS Exchange (LGE) •••
T1 RBS ••
E1 CAS ••
MRD/GEN-GEN •••
Data Interfaces
V.24, V.28, T1A/E1A-232-C ••••
2WTO and 4WTO •
V.35 ••••
X.21/V.11 ••••
OCU-DP ••
2B1Q (interfaced with 275x DTUs) ••••
Aggregate Interfaces
1.544 Mb/s T1 (D4, ESF, 64 kb/s chan.) ••
2.048 Mb/s E1 (CAS, CCS, 64 kb/s chan.) • •
E1 HDSL •
Fractional E1 •
X.21 •
V.35 •
ISDN S/T BRI •
Optical Extension E1 •
DSP Applications
Voice compression
▼8 and 16 kb/s HCV compression •
▼8 kb/s A-CELP (ITU-T Rec. G.729) •
▼16 kb/s LD-CELP (ITU-T Rec. G.728) •
▼ADPCM (ITU-T Rec. G.721) 32 kb/s •
G3 fax support (V.17) over compressed voice (14.4 kb/s max.) •
Modem (V.32bis) tones support over compressed (CELP) voice (14.4 kb/s) •
Subrate multiplexing •••
Echo cancellation •
Voice conference bridging •
Multidrop data bridging ••••
High capacity multiplexing (HCM) ••••
DDS rate adaptation •
Packet Services
Frame relay switching •
Transport HDLC encapulation •
Voice over frame relay •
DLCI multiplexing •
General (maximum)
# of E1 ports 22
# of fractional E1 ports 4
# of T1 ports 12
# of circuits 4 242432
For more information www.cid.alcatel.com
Alcatel, the Alcatel logo, MainStreet and Newbridge are
registered trademarks of Alcatel. All other trademarks are
the property of their respective owners. Alcatel assumes
no responsibility for the accuracy of the information presented,
which is subject to change without notice.
© 2001 Alcatel. All rights reserved. 10604
3CL 00469 0066 TQZZA Ed.02
Technical
Summary
E1 Interfaces
▼Compatible with applicable
sections of ITU-T G.703, G.704
▼HDSL 2B1Q
▼HDB3
▼75/120 line impedance
▼BNC/RJ-45 connectors
▼Single mode optical fiber
via FC/PC connector
▼Typical range up to
18 km (11.16 mi.)
Termination Interfaces
Any two DCMs:
▼X.21 (up to 1.92 Mb/s)
▼V.35 (up to 1.92 Mb/s)
▼Dual port V.24, TIA/EIA-232
(up to 64 kb/s)
▼2B1Q (up to 128 kb/s)
▼Co-directional (fixed at 64 kb/s)
Data Termination Units
With 2B1Q DCM installed:
▼275x DTUs
▼Synchronous data rates
up to 128 kb/s
▼Asynchronous data rates up to
38.4 kb/s (including 14.4 kb/s)
Data Connectors/
Interface Adapters
▼X.21: single 15 pin D-type
female
▼V.35: single 25 pin D-type
female
▼TIA/EIA-232: dual RJ-45 socket
▼Codirectional: dual RJ-45 socket
▼2B1Q: RJ-45 socket
Maintenance
▼All parameters are software
configurable
▼DTE and DCE maintenance
ports
▼Multilevel password protection
▼Automatic self-diagnostics
and directed diagnostics
with statistics
▼Alarm storage buffer
▼Remote alarm signaling
▼Local and remote loop backs
▼Alarm contacts and sensors
▼Compatible with G.821
CRC4 statistics over E1
Physical Description
▼The standard case is a desktop
design with brackets available
for rackmount installation
▼Height: 9.3 cm (3.66 in.), 2VU
▼Width: 43.2 cm (17 in.) without
rack-mounting ears; 48.2 cm
(19 in.) with rack-mounting ears
▼Depth: 28.14 cm (11.08 in.)
▼48.26 cm (19 in.) and
58.42 cm (23 in.) sliding
drawer mountings are
available as options
Operating Environment
▼Temperature: 0 C to 40 C
(32 F to 104 F)
Power
▼Universal AC power supply
90 V AC to 240 V AC
