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4 Troubleshooting
- Make sure all sub-D connectors are secured with
finger screws.
- Make sure the PC interface card is seated snugly in
the PC bus slot.
- Verify the settings of the DIP switch block SW 1 and
the jumpers J-VCC-2 and J-VCC-4 on the PC interface
card. The DIP switch positions must match the board
number in the driver software configuration of the
given ISDN-Controller. The jumpers must be in the
“OFF” position.
4.4 The “Sync” LED is not lit.
Cause:
The AVM ISDN-Controller T1 cannot communicate
with the ISDN network.
Possible remedies:
- First check whether the “System” LED is lit. If not,
then proceed with the instructions in Section 4.3
above, “After the ibase driver is loaded, the “Sys-
tem” LED is not lit”.
- Check the pin assignments of the ISDN NT terminals
and your T1 cable leads: see the table in the
appendix of this manual.
- Check whether the NT is operational: its green LED
must be lit. If it is not, please contact your ISDN
provider.
- Make sure your ISDN provider has activated the S
2M
interface.
- Check the cable from the AVM ISDN-Controller
T1/T1-B to the NT. It must be grounded to the NT,
and secured to the AVM ISDN-Controller T1/T1-
B by tightening the finger screws on the sub-D
connector. Do not use extension cables for this
connection.