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Chapter 10. Troubleshooting
84
ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1-1D
If you Cannot Connect Calls
See Table 10-A for corrective actions if you cannot place calls.
Table 10-A
Troubleshooting Calls
Condition Corrective Action
The ISU 2x64 reads Ready but
calls cannot be placed.
There is most likely a problem in the software setup (trans-
lation) at the CO switch or the network setup in the ISU
2x64.
Local voice calls can be transmit-
ted, but data calls to the same
exchange cannot.
The ISDN line is probably not set up to support data
calls.
Local data calls go through, but
long distance data calls do not.
Ensure the far end is working. If not already doing so,
place the call explicitly specifying the prefix of the long
distance service (for example, 10288 for AT&T). If this
does not work, then most likely the problem is the long
distance service provider. Another possibility is that the
local service provider is not providing long distance
access.
Data calls can be made, but
BONDED data calls cannot.
There is most likely a problem in the software setup (trans-
lation) at the CO switch or the network setup in the ISU
2x64.
Another possibility is that the data circuits provided are
not good enough to support the BONDING negotiation
process.
If the line has two phone numbers, make sure the second
SPID and LDN are entered correctly in SPID2 and LDN2
in the ISU 2x64.
Check with the local service provider to ensure that the
line supports two data calls. The ISU 2x64 status log
buffer shows the sequence of events that occurred. You
need to know which piece of equipment first caused the
BONDING process to terminate. The status logs from
both ends may be necessary to determine this.