Nortel Networks 311

376 NT6D70 SILC Line card

A logical terminal is any terminal that can communicate with the system

over a DSL. It can be directly connected to the DSL through its own

physical termination or be indirectly connected through a common physical

termination.

The length of a DSL depends on the speciﬁc terminal conﬁguration and the

DSL wire gauge; however,it should not exceed 1 km (3,280 ft).

The SILC interface uses a four-conductorcable that provides a differential

Transmitand Receive pair for each DSL. The SILC has options to provide a

total of two watts of power on the Transmitor Receive leads, or no power at

all. When this power is supplied from the S/T interface, the terminal devices

must not draw more thanthe two watts of power. Any power requirements

beyond this limit must be locally powered.

Other functions of the SILC are:

•support point-to-point and multi-point DSL terminal connections

•execute instructions received from the MISP to conﬁgure and control

the S/T interfaces

•provide channel mapping between ISDN BRI format (2B+D) and system

bus format

•multiplex 4 D-channels onto one timeslot

•perform activation and deactivation of DSLs

•provide loopback control of DSLs

•provide a reference clock to the clock controller

The SILC provides eight S/T fourwire full duplex polarity sensitive interfaces

that are used to connect ISDN BRI compatible terminals over Digital

Subscriber Loops (DSL) to the Meridian 1. Each S/T interface provides two

B-channels and one D-channel and supports a maximum of eight physical

connections that can link up to 20 logical terminals on one DSL.

A logical terminal is any terminal that can communicate with the Meridian

1 over a DSL. It maybe directly connected to the DSL through its own

physical termination or be indirectly connected through a common physical

termination.

The length of a DSL depends on the speciﬁc terminal conﬁguration and the

DSL wire gauge, however,it should not exceed 1 km (3,280 ft).

The SILC interface uses a 4 conductor cable that provides a differential

Transmitand Receive pair for each DSL. The SILC has options to provide a

total of 2 Watts of power on the Transmitor Receive leads, or no power at

all. When this power is supplied from the S/T interface, the terminal devices

must not draw more than the 2Watts of power. Any power requirements

beyond this limit must be locally powered.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311 01.04 Standard

Release 5.0 23 May 2008