Dsl Configuration; Silc Dsl Configuration - Nortel Meridian 1 Administration And Maintenance

Chapter 5 — ISDN BRI line and packet data implementation

DSL configuration

Digital subscriber loops connect the Option 11 to ISDN BRI terminals. A
DSL consists of a cable connecting the ISDN BRI port to the cross-connect
terminal. From there, the loop is cross-connected to the office wiring, which
terminates into 8-pin modular jacks (typically wall outlets). From these
outlets, module cables of a maximum length of 10 m (33 ft) connect to ISDN
BRI terminals.
The DSLs should be engineered with the following basic considerations in
mind:
— loop length
— cable type and wire gauge
— distribution of terminals on a DSL
— type of terminals connected to a DSL

SILC DSL configuration

The SILC supports both point-to-point and point-to-multipoint transmission.
The maximum DSL length must not exceed 1 km (3,280 ft); however, the
actual length depends on the cable wire gauge, the number of terminals
connected to the loop, and the differential round-trip time delay limits.
When you are configuring DSLs, follow these basic rules:
— maintain wiring polarity for both the transmit and receive pairs
— use a maximum of 10 m (33 ft) modular cable to connect each ISDN BRI
terminal to the DSL
— keep the length of the cable stub (distance between the RJ-45 receptacle
and the DSL cable) to less then 1 m (3.3 ft)
— don't allow bridge taps or split pairs on the DSL and make sure that the
differential pairs (Tx-/Tx+ and Rx-/Rx+), each consist of a twisted pair
along the entire length of the DSL
— make sure ISDN BRI terminals powered through the DSL do not exceed
the total power of 2 Watts (see Line powering in this chapter)
Option 11C ISDN BRI Administration and Maintenance
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