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4.1 Troubleshooting
236 Installation Manual
300* Digital trunk out of
synchronization
• Network (digital trunk)
malfunction
• Optional service card
malfunction: PRI, T1, E1
• Wrong A/B switch setting:
PRI, T1, E1
• Wrong termination switch
setting: PRI30, E1
• Check the signals from the network
• Check the cable
• See if the A/B switch is set to A on the
corresponding optional service card
• See if the termination switch is set
properly on the corresponding optional
service card: 120 Ω when using RJ45
connector; 75 Ω when using BNC
connector
• See if the corresponding optional
service card is installed properly
• Replace the corresponding optional
service card
301* Digital trunk RAI
reception
302* Digital trunk AIS
reception
303* Multiframe out of
synchronization
304* Frame error
305* Data Link failure • Data link between the CS
and CSIF card or DHLC/
DLC card failed
• Data link between the
network and PRI/BRI card
failed
• Data link between the
network and IP-GW card
failed
• Check the connection between the CS
and CSIF card or DHLC/DLC card
• Check the connection between the
network and PRI/BRI card
• Check the connection between the
network and IP-GW card
306 E1 Channel Block
failure
• Network (digital trunk)
malfunction
• Optional service card
malfunction: E1
• Wrong A/B switch setting:
E1
• Wrong termination switch
setting: E1
• Check the signals from the network
• Check the cable
• See if the A/B switch is set to A on the
corresponding optional service card
• See if the termination switch is set
properly on the corresponding optional
service card: 120 Ω when using RJ45
connector; 75 Ω when using BNC
connector
• See if the corresponding optional
service card is installed properly
• Replace the corresponding optional
service card
307 LAN No Carrier • IP-GW card not connected
to the LAN
• Check the connection between the
LAN and IP-GW card
308 IP-GW LAN Loop
back Error
• Detection of IP-GW LAN
Loop back Test error
• Replace the corresponding optional
service card
• Collect the log data of IP-GW (refer to
the documentation for the IP-GW card)
309 IP-GW Core Data
Link Error
• Detection of IP-GW Core
data Link error
• Press the Reset Button
• Collect the log data of IP-GW (refer to
the documentation for the IP-GW card)
Error Code Error Message PROBABLE CAUSE SOLUTION