Routine Maintenance Procedures
555-233-123
5-86 Issue 4 May 2002
Physical Layer
Is there an optical signal between the TN230X and the A500?
1. Does the TN230X’s yellow LED flash 100ms on/100ms off, indicating a loss
of signal on the fiber? The TN230X detects continuity problems with either
the Transmit (bottom) or the Receive (top) fibers.
2. Is the A500 port’s CD LED off, indicating a loss of signal on the fiber? The
A500 detects continuity problems only with the Receive (right-hand) fiber;
the state of the Transmit (left-hand) fiber is not detected.
3. Type show signaling summary on the A500 console. Screen 5-25 shows
the output.
Screen 5-25. A500: show signaling summary screen
Ensure that the fields have the values indicated below.
4. Enter show system interfaces on the A500 console. Screen 5-26 on page
5-87 shows an example of the screen output.
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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