Page366 of 544 NT8D02and NTDK16 Digital Line Cards
553-3011-100 Standard14.00 January 2002
The NTDK16 is a 48 port card supported only in the Option 11C Mini. It is
based on the NT8D02 Digital Line Card, it is functionally equivalent to three
NT8D02s, and configured as cards 4, 5, and 6 in the main chassis. It uses A94
Digital Line Interface chips (DLIC) to provide the interface between the
Digital sets and the Option 11C Mini system.
In Option 11C Mini systems the NTDK16 Digital Line Card can only be
installed in slot 4 of the main chassis which is slotted to prevent accidental
insertion of other cards.
Physical
The digital line card circuitry is contained on a 320 mm (12.5 in.) by
254mm (10 in.) printed circuit board (PCB). The NT8D02 is a double-sided
PCB, whereas the NTDK16 is 4 layers, but standard thickness. Both cards
connect to the backplane through a 120-pin or 160-pin edge connector.
The faceplate of the NTDK16BA digital line card is equipped with three light
emitting diodes (LEDs). A red LED lights when the card is disabled. At
power-up, this LED flashes as the digital line card runs a self-test. If the test
completes successfully, the card is automatically enabled (if it is configured
in software) and the LED goes out. This LED only shows the status of the
NTDK16 in slot4.
Note: The NTDK16AA has one LED. This LED shows the status of
Card4. The NTDK16BA has three LEDs. These LEDs show the status
of Cards 4, 5, and 6 configured on the NTDK16.
Functional descript ion 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