U interface logic – Nortel Networks 1000 User Manual
Page 382
382
NT6D71 UILC line card
The PE interface logic consists of a Card-LAN interface, a PE bus
interface, a maintenance signaling channel interface, a digital pad, and a
clock converter.
The Card-LAN interface is used for routine card maintenance, which
includes polling the line cards to find in which card slot the UILC is
installed. It also queries the status and identification of the card and
reports the configuration data and firmware version of the card.
The PE bus interface connects one PE 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 CS 1000CPU to
the UILC 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 B-channel voice calls.
The clock converter converts the 5.12-MHz clock from the PE backplane
into a 2.56-MHz clock to time the PE bus channels and an 8-kHz clock to
provide PCM framing bits.
U interface logic
The U interface logic consists of a transceiver circuit. It provides loop
termination and high-voltage protection to eliminate the external hazards
on the DSL. The U interface supports voice and data terminals, D-channel
packet data terminals, and NT1s. A UILC has eight transceivers to support
eight DSLs for point-to-point operation.The U interface logic consists of a
transceiver circuit. It provides loop termination and high voltage protection
to eliminate the external hazards on the DSL. The U interface supports
circuit-switched voice and data terminals, D-channel packet data terminals,
and NT1s. A UILC has eight transceivers to support eight DSLs for
point-to-point operation.
The U interface logic consists of a transceiver circuit. It provides loop
termination and high-voltage protection to eliminate the external hazards
on the DSL. The U interface supports voice and data terminals, D-channel
packet data terminals, and NT1s. A UILC has eight transceivers to support
eight DSLs for point-to-point operation.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.