Nortel Networks Circuit Card 311 - Manual (Page 377)

Functional description 377
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
Meridian 1 system bus format
• multiplexes 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 NT6D70 SILC Card provides eight S/T four-wire full-duplex
polarity-sensitive interfaces to connect ISDN BRI-compatible terminals over
DSL to the CS 1000. 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 CS 1000
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-conductor cable that provides a differential
Transmit and Receive pair for each DSL. The SILC has options to provide a
total of two watts of power on the Transmit or 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 two watts of power. Any power requirements
beyond this limit must be locally powered.
Other functions of the SILC include the following:
• 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 CS
1000 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
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
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