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MAX Administration Guide
Administering MAX Hardware
Troubleshooting cable issues
1
While monitoring the Port Leads status menu of the AIM ports used in the call, place an
outgoing call from your equipment.
2
Once the host has requested the outgoing call, toggle the CD output signal to Active (+).
The codec should recognize that the call is online.
3
Make a request to clear the call from the codec.
4
Watch the control leads very carefully as one or more of the input control lines toggle.
Generally, either DTR or RTS is the line that toggles. Record whether the control lead
input goes to Active (+) or Inactive (-) when the call is cleared.
5
Verify that the value of the Clear parameter in the Port profile matches the action that the
codec takes when the call is cleared.
Troubleshooting cable issues
Data errors on all calls can indicate that you have installed faulty host interface cables or cables
not suited to the application. Information on host interface cabling requirements is found in the
Hardware Installation and Basic Configuration Guide for your unit.
If you have purchased or built your own cables, verify that the pin-out is the same as the MAX
pin-out for compatibility. The Hardware Installation Guide and Basic Configuration Guide for
your MAX unit lists the host interface pin-outs.
Frequently, a DB-25 breakout box is useful for monitoring control leads and for making quick
changes to the cabling. However, because the host interface is running V.35 or RS-422 signal
levels, you must verify that the breakout box is passive. That is, you must verify that the
breakout box is not regenerating RS-232 level signals.
Displaying interface statistics
To display the supported interface-statistics commands, enter the Show IF command with a
question mark. For example:
ascend% show if ?
show if ? Display help information
show if statsDisplay Interface Statistics
show if totalsDisplay Interface Total counts