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Page 518 of 894 NT8D02 and NTDK16 Digital Line cards
553-3001-211 Standard 2.00 September 2004
Functional description
NT8D02 Digital Line card
The NT8D02 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 NT8D02 Digital Line card is equipped with 16 identical digital line
interfaces. Each interface provides a multiplexed voice, data, and signaling
path to and from a digital terminal (telephone) 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, giving a total of 32 addressable units
per card. The digital line card supports Nortel Networks’ Meridian Digital
Telephone.
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
Figure 102 on page 519 shows a block diagram of the major functions
contained on the NT8D02 Digital Line card. Each of these functions is
described on the following pages.