Nortel Circuit Card 311 Reference page 985

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•
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The receive and transmit clocks can be of slightly different bit rates from
each other as determined by the transmit and receive carrier clocks.
The NTBK50 supports a D-Channel Handler Interface (DCHI)
daughterboard. It is equivalent to a single port of an NTAK02 SDI/DCH card.
The NTBK50 also supports a Downloadable D-Channel Handler interface
(DDCH) daughterboard. The DDCH brings MSDL D-channel capability to
the system.
The D-channel support interface is a 64 kbps, full-duplex serial bit stream
configured as a DCE device. The data signals include: (1) Receive data
output, (2) transmit data input, (3) receive clock output, and (4) transmit clock
output. The receive and transmit clocks can be of slightly different bit rates
from each other as determined by the transmit and receive carrier clocks.
The NTBK50 supports a daughterboard D-channel handler interface (DCHI).
It is the equivalent to a single port of an NTAK02 SDI/DCH card. As well, the
NTBK50 supports a Downloadable D-channel handler interface (DDCH). It
brings the MSDL D-channel capability into the Option 11C system.
The D-channel support interface is a 64 Kbps, full-duplex serial bit stream
configured as a DCE device. The data signals include:
•
•
•
•
The receive and transmit clocks can be of slightly different bit rates from
each other as determined by the transmit and receive carrier clocks.
The NTBK50 supports a D-Channel Handler Interface (DCHI)
daughterboard. It is equivalent to a single port of an NTAK02 SDI/DCH card.
The NTBK50 also supports a Downloadable D-Channel Handler interface
(DDCH) daughterboard. The DDCH brings MSDL D-channel capability to
the CS 1000 system.
DCHI Configuration for NTAK93 only (SW1)
The NTAK93 DCHI daughterboard can be operated in two separate modes
defined by an on-board dip switch. It can operate in a standard DCHI mode
common to most ISDN standard countries. It can also operate in a DPNSS
Copyright © 2003-2008, Nortel Networks
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transmit data input
receive clock output
transmit clock output
receive data output
transmit data input
receive clock output
transmit clock output
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Architecture 985