Nortel Networks 1000 User Manual
Page 844
844
NTAK79 2.0 Mb PRI card
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 362
Settings for the DCHI dip switch (SW1)
Switch
Function
On
Off
S1-1
En/Dis
Enabled
Disabled
S1-2
F/W Mode
DPNSS
DCHI
The D-channel support 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
•
transmit clock output
The receive and transmit clocks vary in bit rate between 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 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
.
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 363
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
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.