Chapter 10. Troubleshooting84 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1-1DIf you Cannot Connect CallsSee Table 10-A for corrective actions if you cannot place calls.Table 10-ATroubleshooting CallsCondition Corrective ActionThe ISU 2x64 reads Ready butcalls 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 ISU2x64.Local voice calls can be transmit-ted, but data calls to the sameexchange cannot.The ISDN line is probably not set up to support datacalls.Local data calls go through, butlong 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 longdistance service (for example, 10288 for AT&T). If thisdoes not work, then most likely the problem is the longdistance service provider. Another possibility is that thelocal service provider is not providing long distanceaccess.Data calls can be made, butBONDED 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 ISU2x64.Another possibility is that the data circuits provided arenot good enough to support the BONDING negotiationprocess.If the line has two phone numbers, make sure the secondSPID and LDN are entered correctly in SPID2 and LDN2in the ISU 2x64.Check with the local service provider to ensure that theline supports two data calls. The ISU 2x64 status logbuffer shows the sequence of events that occurred. Youneed to know which piece of equipment first caused theBONDING process to terminate. The status logs fromboth ends may be necessary to determine this.
