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1 — Introduction
1.1
Product overview
The 2902 MainStreet Network Termination Unit is a high-speed NTU for data
devices. The 2902 MainStreet unit also provides CEPT voice bypass capability. It
supports two E1 primary rate interfaces and two data interface modules. HDSL
technology allows connection to E1 lines using twisted copper pairs, without
repeaters.
The 2902 MainStreet unit gives customers access to public and private switched
networks. It can be used in point-to-point, or drop and insert configurations. The unit
also features circuit protection switching, bypass operation, subrate and super-rate
connections, system diagnostics, statistics collection, line and circuit maintenance
testing, alarm collection, and database management functions.
The E1 HDSL and E1 Optical LIMs allow the 2902 MainStreet unit to serve as a
high-speed NTU, providing low-cost, high-speed X.21 or V.35 circuits for LAN
interconnection. E1 G.703 LIMs can also provide high-speed connections to an E1
network. Additionally, an E1 G.703 LIM can be used as a tributary connection to a
PBX, allowing voice bypass connections to an E1 HDSL, E1 Optical, or another E1
G.703 LIM.
Figure 1-1 shows the exterior of a desktop unit. The unit can be placed on a desktop
or, with the appropriate hardware, adapted for a rack. Physical connections to
primary rate lines can be made through BNC or RJ45 connectors.
The system uses customer-installed modules to connect to E1 lines and data devices.
E1 lines connect to a 2902 MainStreet unit through the following line interface
modules:
•
E1 G.703 LIM
•
E1 HDSL LIM
•
E1 HDSL LIM2
•
E1 Optical LIM
1-2
Figure 1-1 2902 MainStreet Network Termination Unit
29 02 Ma in St re et
Netw ork Term inat
ion Unit
Pow er
Pro ces sor
Eve nt Sta tus
Out of Syn c 1
Sys tem Sta tus
Out of Syn c 2
2902 MainStreet Technical Practices
90-2906-01
8827
May 2002
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