Nortel Networks 553-3001-211 manual Channel interface, DS-1 Carrier interface, Transmitter

NTAK09 1.5 Mb DTI/PRI card Page 705 of 894

D-channel interface

The D-channel interface is a 64 Kbps maximum, full-duplex, serial bit-stream configured as a DCE device. The data signals include receive data output, transmit data input, receive clock output, and transmit clock output. The receive and transmit clocks can vary slightly from each other as determined by the transmit and receive carrier clocks.

Feature selection through software configuration for the D-channel includes:

•56 Kbps

•64 Kbps clear

•64 Kbps inverted (64 Kbps restricted)

DCHI can be enabled and disabled independent of the PRI card, as long as the PRI card is inserted in its cabinet slot. The D-channel data link cannot be established however, unless the PRI loop is enabled.

On the NTAK09 use switch 1 and position 1 to select either the D-channel feature or the DPNSS feature, as follows:

•OFF = D-channel

•ON = DPNSS (U.K.)

DS-1 Carrier interface

Transmitter

The transmitter takes the binary data (dual unipolar) from the PCM transceiver and produces bipolar pulses for transmission to the external digital facility. The DS1 transmit equalizer enables the cabling distance to

Circuit Card Description and Installation