ADTRAN ISU 2X64 user manual If you Cannot Connect Calls, Troubleshooting Calls

Chapter 10. Troubleshooting

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	There is most likely a problem in the software setup (trans-
calls cannot be placed.	lation) at the CO switch or the network setup in the ISU
	2x64.
Local voice calls can be transmit-	The ISDN line is probably not set up to support data
ted, but data calls to the same	calls.
exchange cannot.
Local data calls go through, but	Ensure the far end is working. If not already doing so,
long distance data calls do not.	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	There is most likely a problem in the software setup (trans-
BONDED data calls cannot.	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.

84 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1-1D