Nortel Networks Circuit Card 311 - Manual (Page 943)

Architecture 943
The NTAK79 has an onboard D-Channel Handler Interface (DCHI). It is the
equivalent to a single port of an NTAK02 SDI/DCH pack. This enables for
a completely operational ISDN PRA link with clock synchronization and
D-channel on a single circuit card.
The onboard D-channel has one status LED on the NTAK79 faceplate to
indicate enabled/disabled states. See
Table 376 "NTAK79 LEDs" (page
924) .
The on-board DCHI can be operated in two separate modes as defined by
an on-board dip switch. It can operate in a standard DCHI mode common
to most ISDN standard countries. The U.K. specific mode that uses the
DPNSS format is not supported at this time.
Table 396
Settings for the DCHI dip switch (SW1)
Switch Function On Off
S1-1 En/Dis Enabled Disabled
S1-2 F/W Mode DPNSS (not
supported at
this time)
DCHI
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 NTAK79 has an onboard D-channel handler interface (DCHI). It is the
equivalent to a single port of an NTAK02 SDI/DCH pack. This allows for
a completely operational ISDN PRA link with clock synchronization and
D-channel on a single circuit card.
The onboard D-channel has one status LED on the NTAK79 faceplate to
indicate enabled/disabled states. (See
Table 377 "NTAK79 LEDs" (page
926) ).
The on-board DCHI can be operated in two separate modes as 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 an U.K. specific
mode using the DPNSS format.
Table 397
Settings for the DCHI dip switch (SW1)
Switch Function On Off
S1-1 En/Dis Enabled Disabled
S1-2 F/W Mode DPNSS DCHI
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
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