Slip Control - Avaya Nortel Communication Server 1000 Reference

NTAK79 2.0 Mb PRI card

Slip control

Slip control provides organized recovery of PCM when the clock recovered from the external
facility is at a different frequency than the local clock.
D-channel support interface
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 have 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 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 234: Settings for the DCHI dip switch (SW1)
Switch
S1-1
S1-2
DCHI special applications connection
The connection between the PRI2 and the on-board D-channel Handler Interface card is also
available at the MDF connector. Connections are made to these pins for normal on-board DCHI
operation. They can also be used for future or special applications.
The signals conform to the EIA RS-422 standard.
530 Circuit Card Reference
Table 226: NTAK79 LEDs
Function
En/Dis
F/W Mode
Comments? infodev@avaya.com
on page 522.
On
Enabled
DPNSS (not
supported at this
time)
Off
Disabled
DCHI
July 2011