D-Channel Interface - Avaya Nortel Communication Server 1000 Reference

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 extend from the card to the DSX-1 or LD-1. Equalizers are
Circuit Card Reference
Offset
8
9
A
B unassigned code, FF
C
D
E
F
PAD set 0
–3dB
–4dB
idle code, 7F
1dB
–2dB
–5db
–6db
Architecture
PAD set 1
11db
12db
3db
14db
spare
spare
spare
spare
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