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1 — Introduction
The personality module in Slot 1 connects to the data interface module in physical
position 1 (NMTI logical position M01). The personality module in Slot 2 connects
to physical position 2 (NMTI logical position M09).
Primary rate link connectors (Rx-1, Tx-1, Rx-2, Tx-2, Line-1, Line-2, P1 and P2)
The BNC connectors labeled Rx-1, Tx-1, Rx-2 and Tx-2 are for 75 Ω E1 network
termination. Rx-1 and Tx-1 connect to LIM P1; Rx-2 and Tx-2 connect to LIM P2.
The RJ45 connectors labeled Line-1 and Line-2 are for 120 Ω E1 or HDSL network
termination. Line-1 connects to LIM P1; Line-2 connects to LIM P2.
The FC_PC connectors labeled P1 and P2 are for optical network connections.
P1 connects to LIM P1; P2 connects to LIM P2.
Serial port connectors (Modem and Terminal)
The two RJ45 connectors labeled Modem and Terminal are EIA/TIA-232 serial port
connectors. The Terminal connector is configured for a direct connection to node
management equipment. The Modem connector is configured for an indirect (or
remote) connection to node management equipment through a modem.
External alarm connector (Alarm)
The connector labeled Alarm is an RJ11 connector. Through the Alarm connector,
the 2902 MainStreet system can monitor external equipment for alarm conditions
and can signal an alarm condition to an indicating device (such as a light or buzzer).
LED indicators
A Control card status LED, a seven-segment display, and a group of four loopback
LEDs are mounted on the edge of the Control card. These provide information about
card and module status and indicate activated loopbacks.
1.3
HDSL LIM overview
HDSL is a technology that provides transport of E1 service over two pairs of
unconditioned copper loops, allowing service providers and private network users to
take advantage of their installed base of copper facilities.
HDSL delivers bidirectional (full-duplex) 2.048 Mb/s transmission capability over
two non-loaded, two-wire metallic pairs. This eliminates the need for additional
conditioned lines and repeaters to achieve similar distances.
The E1 HDSL LIM and E1 HDSL LIM2 can help to significantly reduce carrier
provisioning cost, improve service response times and enhance transmission quality.
Line conditioning is simplified, since bridge taps and mixed cable gauge concerns
are eliminated. Also, binder separation is no longer required.
The E1 HDSL LIMs pass all defined ETSI loops. For example, the LIMs can achieve
a maximum reach of 3700 m (12 139 ft) with zero noise using 0.4 mm wire, or
2850 m (9350 ft) with 0 dB ETSI noise. Impairments such as noise, cross-talk,
bridge taps, and splices can affect the quality of the signal and loop length.
1-6
2902 MainStreet Technical Practices
90-2906-01
May 2002
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