ATM Tips
Issue 1 May 2002
4-45555-233-143
■ The Result should be PASS for each test number. If any of the
tests fail, refer to ‘‘ATM-BCH (ATM B-Channel Trunk)’’ on page
8-168.
Possible Causes
1. The TN230X board is in a slot different from the S8700 Multi-Connect
administration.
2. The TN230X did not complete board insertion.
Physical Layer
Is there an optical signal between the TN230X and the A500?
1. Does the TN230X’s amber LED flash 100ms on/100ms off, indicating a
loss of signal on the fiber? Recall that the TN230X detects continuity
problems with either the Transmit (bottom) or the Receive (top) fibers.
If there is loss of signal on the fiber, refer to ‘‘Fault Isolation for Fiber Links’’
on page 4-19.
2. Is the A500 port’s CD LED off, indicating a loss of signal on the fiber? Note
that the A500 detects continuity problems only with the Receive
(right-hand) fiber; the state of the Transmit (left-hand) fiber is not detected.
3. Enter show signaling summary on the A500 console. Figure 4-25 shows
the screen output.
Figure 4-25. A500: show signaling summary screen
Ensure that the fields have the following indicated values.
SAP State Up
If it is PHY_DOWN or DOWN, then there is probably a loss of signal on the
port in question. This command detects a continuity problem only with the
Receive (right-hand) fiber; it does not detect the state of the Transmit
(left-hand) fiber.
State The value of may be UP or DOWN, depending on the administration of the
port. It may be necessary to re-administer the A500 port boards. Refer to
the Cajun A500 Quick Reference for further information.
A500:show signaling summary
Port loc VCI SAP IntType Signaling ILMI SAP State State
------ ------- --- ------- ----------- ---- ------------ -----
A1.1 1 1 Network UNI3.1 No UP UP
A1.2 2 2 Network UNI3.1 No UP UP
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