Common Problems And Their Solutions - Panasonic Digital Business System Installation Manual

March 1997

Common Problems And Their Solutions

1 Before connection of the DBS to the network using DASSII the network termination should be left with the
coax cables looping back on themselves so the network connection is not interrupted.
2 Program the DBS for ISDN connection whilst it is disconnected from the network.
Note 1: If the channels are a mixture of DDI and non-DDI numbers the 'Default DDI Number' (FF1 6#
4# 5#) must not be set. If this is set the DBS will not be able to receive incoming calls on
non-DDI lines.
3 When all system programming has been completed perform a power off/power on reset to ensure the
program settings are invoked.
4 Confirm with the network operator that ISDN services have been activated for the customer.
5 If you have a network simulator check DBS operation to the simulator.
6 If you have a PBX simulator check network operation to the simulator.
7 If the tests 5 & 6 show that the DBS and network are working, connect the live DBS to the active network.
For DASSII, Connect TRS on the DBS MDF to RX (or IN) at the network termination and RCV on the DBS
MDF to TX (or OUT) on the network termination. For E-ISDN plug in the RJ45 cable.
8 Wait for approximately 3-5 minutes for the DBS and network to establish a stable link. When the first
connection is made the DBS and network synchronise timing and then the transmit channels are
initialised, followed by the receive channels then all channels are sequentially cleared ready for call traffic.
9 If the DBS cannot make a call, check that the network services have been activated and request that they
be reset. Following the reset wait for 3-5 minutes for the DBS and network to synchronise and try to make
a call.
Note 2: If the DBS is to be left switched off for an extended period of time the hardware loop ( item
1, above) must be replaced and the DBS left disconnected from the network. When it is re-
activated and reconnected wait for 3-5 minutes before making a call.
Note 3: If the CFA and OOF LEDs on the DASS TRK stay lit a connection fault is indicated. Check
the connections. If the connections are correct then a possible network problem is
indicated.
Note 4: If the AIS or YEL LED on the DASS TRK card are lit it indicates a fault in the interface
between the DBS and network. Confirm network operation and try to reconnect the DBS.
Note 5: Do not set 'Internal Synchronisation' (FF1 6# 99# 5#) otherwise the connection to the
network will fail.
10 Check the ISDN channels to be used are functioning by making a test call from each one.
Note 6: If any channels do not have full voice operation check the sync unit is correctly installed
on the CPC card.
Note 7: If incoming DDI calls revert to the operator with the message 'DDI FAIL', check that the DDI
numbers are stored correctly and that they match the format supplied from the network.
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