Nortel NT8D02 16端口数字分机板

Functional description of the NT8D02
The digital line card is equipped with 16 identical units. Each unit provides a
multiplexed voice, data, and signaling path to and from digital apparatus over
a 2-wire full duplex 512 kHz time compression multiplexed (TCM) digital
link. Each digital telephone and associated data terminal is assigned a
separate terminal number (TN) in the system database, for a total of 32
addressable ports per card.
The digital line card contains a microprocessor that provides the following
functions:
• self-identification
• self-test

• control of card operation
• status report to the controller
• maintenance diagnostics