Nortel Networks Circuit Card 311 - Manual (Page 379)

Functional description 379
The Card-LAN interface is used for routine card maintenance, which
includes polling the line cards to find the card slot where the SILC is
installed. It also queries the status and identification of the card and reports
the configuration data and firmware version of the card.
The IPE bus interface connects an IPE bus loop that has 32 channels
operating at 64 kbps and one additional validation and signaling bit.
The Maintenance Signaling Channel (MSC) interface communicates
signaling and card identification information from the system CPU to
the SILC MCU. The signaling information also contains maintenance
instructions.
The digital pad provides gain or attenuation values to condition the level of
the digitized transmission signal according to the network loss plan. This
sets transmission levels for the B-channel voice calls.
The clock recovery circuit recovers the clock from the local exchange.
The clock converter converts the 5.12-MHz clock from the IPE backplane
into a 2.56 MHz clock to time the IPE bus channels and an 8 kHz clock to
provide PCM framing bits.
The IPE interface logic consists of a Card-LAN interface, an IPE bus
interface, a maintenance signaling channel interface, a digital pad, and a
clock controller and converter.
The Card-LAN interface is used for routine card maintenance, which
includes polling the line cards to find in which card slot the SILC is installed.
It also queries the status and identification of the card, and reports the
configuration data and firmware version of the card.
The IPE bus interface connects one IPE bus loop that has 32 channels
operating at 64 kbps and one additional validation and signaling bit.
The maintenance signaling channel (MSC) interface is used to communicate
signaling and card identification information from the Meridian 1 CPU
to the SILC MCU. The signaling information also contains maintenance
instructions.
The digital pad provides gain or attenuation values to condition the level of
the digitized transmission signal according to the network loss plan. This
sets transmission levels for the B-channel circuit-switched voice calls.
The clock recovery circuit recovers the clock from the local exchange.
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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