Nortel Networks Circuit Card 311 - Manual (Page 1073)

Architecture 1073
• 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 unless the PRI loop is enabled.
On the NTRB21 use switch 1, position 1 to select either the D-channel
feature or the DPNSS feature, as follows:
OFF = D-channel
The ON setting for DPNSS (U.K.) is not supported at this time.
The D-channel interface is a 64 Kbps, 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 be of slightly different bit rate 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 NTRB21 use switch 1, position 1 to select either the D-channel
feature or the DPNSS feature, as follows:
OFF = D-channel
ON = DPNSS (U.K.).
The D-channel interface is a 64 kbps, full-duplex, serial bit-stream
configured as a Data Circuit-terminating Equipment (DCE) device. The
data signals include:
• receive data output
• transmit data input
• receive clock output
• transmit clock output
The bit rate of the receive and transmit clocks can vary slightly from each
other. This is determined by the transmit and receive carrier clocks.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.