Logical Channel Ranges

Logical channel number mismatches can be difficult to diagnose, especially if you are viewing output from x25trace. You see a Call Request packet going out, but no response at the X.25 Packet Layer. In a facilities mismatch, for example, you receive a Clear Indication from the remote end. The Clear Indication contains an error code that is occasionally helpful in pinpointing the problem. The following symptoms may mean that the logical channel ranges are incorrectly configured:

• Inability to establish a packet level connection--for example PAD calls fail

• Traffic can be sent in one direction only

• PAD calls are cleared with the error Call Cleared - Out of Order (0900)

• Calls are cleared with an error code of 0x00 24

Check that the logical channel ranges you configured match those used on the X.25 network. If this is a PSDN, contact your service provider to find out what these should be. Refer to "Configuring a Single WAN Link" for information on how to use x25tool to set the logical channel ranges.