Nortel Networks 553-3001-211 Manual Do Utilizador

 NT6D71 UILC Line card

The serial control interface is an IPE bus that communicates with the 
U transceivers.

The IPE interface logic consists of a Card-LAN interface, a IPE 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 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 communicates 
signaling and card identification information from the system CPU 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 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 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.