Nortel Networks 553-3001-211 manual NT6D71 Uilc Line card Page 375

NT6D71 UILC Line card Page 375 of 894

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

IPE interface logic

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.

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.

Circuit Card Description and Installation