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Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, Cisco MGX 8830, and Cisco MGX 8880 Configuration Guide
Release 5.0.10, OL-3845-01 Rev. B0, August 16, 2004
Chapter 9 Switch Operating Procedures
Managing Redundant APS Lines
Step 1 Enter the dsplns command to determine if the line in alarm is an APS line. The dsplns command
shows which lines are enabled for APS.
mgx8830a.1.PXM.a > dsplns
Medium Medium
Sonet Line Line Line Frame Line Line Alarm APS
Line State Type Lpbk Scramble Coding Type State Enabled
----- ----- ------------ ------ -------- ------ ------- ----- --------
1.1 Up sonetSts12c NoLoop Enable Other ShortSMF Clear Enable
1.2 Up sonetSts12c NoLoop Enable Other ShortSMF Clear Disable
2.1 Up sonetSts12c NoLoop Enable Other ShortSMF Clear Disable
2.2 Up sonetSts12c NoLoop Enable Other ShortSMF Clear Disable
If the line in alarm is an APS line, and has always functioned properly as an APS line, proceed to Step 2.
If the line in alarm has never functioned properly as an APS line, verify that the following are true:
• Redundant front and back cards are in the appropriate bays and are installed at both ends of the line.
• Cable is properly connected to both ends of the line.
• Enter the dspapsbkplane command to verify that the APS connector is installed properly at both
ends of the line.
Step 2 Enter the dspapslns command at both ends of the communication line to determine whether one or both
lines in an APS pair are bad.
Use Table 9-8 to help you determine which APS line is not functioning properly.
Table 9-8 Troubleshooting APS Line Problems Using the dspaps Command
Active
Line
Working
Line
Protection
Line
Working
Line LED
Protection
Line LED Description
Working OK OK Green Green Active card is receiving signal on working and protection
lines. This does not guarantee that transmit lines are
functioning properly. You must view the status on remote
switch.
Protection SF OK Green Red Active card is receiving signal on the protection line. No
signal received on the working line.
Working OK SF Green Red Active card is receiving signal on the working line. No
signal received on the protection line.
Working SF SF Red Red Active card is not receiving signal from either line. The
working line was the last line to work.
Protection SF SF Red Red Active card is not receiving signal from either line. The
protection line was the last line to work.
Working UNAVAIL UNAVAIL The card set is not complete. One or more cards have failed
or been removed. See Table 9-9 to troubleshoot card errors.
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