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-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 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 23May 2008
Copyright© 2003-2008, Nor tel Networks
.