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Conversions and Transparency
5 Conversions and Transparency
5.1 Q.931/DPNSS Conversion
5.1.1 Default Configuration
The conversion is pre-programmed for DPNSS Transparent usage of a QSIG network.
G.704:
Q.931 port set to ISO CRC-4 multiframe mode, DPNSS port set to
Double Frame mode
DPNSS:
DPNSS support on port 2: configured at Level 2 as A end, and at
Level 3 as 30 channels, all X end.
Service Options:
CLI/OLI/TLI ENABLED
BSS-M/BSS-P ENABLED
NAE ENABLED
Transparency END POINT
Q.931:
Q.931 support on port 1: ISO QSIG
Layer 2 initial window size = 7
Configured at Layers 2 and 3 as USER end
Full overlap signalling support BOTHWAYS
Switch Q.931 call to lowest free channel to resolve contention.
Service Options:
CLI/OLI/TLI ENABLED
SUB ADDRESS ENABLED
Transparency END POINT & TRANSIT
5.1.2 Configuration Options
The clock source is configured to select the Q.931 port by a switch on the rear of the unit. The
Q.931 ports can be configured to operate without CRC-4 checking (double frame operation).
The DPNSS port can be subconfigured for fewer than 30 channels. Q.931 usage is restricted
to the same channels.
At the Link Layer the Q.931 port can be configured to clear calls when a Physical Layer fault
is notified or to disregard such faults, relying on Layer 3 mechanisms to validate the status of
active calls. Calls are cleared on notification of a DPNSS Physical Layer fault.
The DPNSS port can be configured at Level 2 to be either
A
or
B
oriented. If the attached
DPNSS equipment is
A
then the port must be configured as
B
, and vice versa.
Each DPNSS channel (timeslot) can be independently configured to be either
X
or
Y
oriented. For channels configured on the attached DPNSS equipment to
X
then the
InterChange iQ 2000 channel must be configured as
Y
and vice versa.
