Specifications

5-10
Cisco MGX 8800/8900 Series Software Configuration Guide
Release 5.1, Part Number OL-6482-01, Rev. A0, January 25, 2005
Chapter 5 Preparing SRM Cards for Communications
Establishing Redundancy Between SONET/SDH Lines with APS
Step 2 Verify that the switch has redundant SRM back cards installed in all bays that will support bulk
distribution and line redundancy (redundant SRM back cards can support a standalone PXM/SRM
installation). For more information, refer to the Cisco MGX 8800/8900 Hardware Installation Guide,
Releases 2 - 5.1.
Step 3 If you have not done so already, bring up the working line as described in the “Bringing Up Lines”
section earlier in this chapter. The working line is the line on the primary SRME card, which will be in
slot 7, 15, or 31.
Step 4 If you are configuring an SRM on a MGX 8850 (PXM1E/PXM45), enter the dspapsbkplane command
to verify that an APS connector is in the bay where APS is to be configured. For example.
PXM_SJ.7.PXM.a > dspapsbkplane
This feature does not apply to the card present in this slot
SRME Top Bay:APS Back Plane Not Engaged or Adjacent Back Card Not Present.
SRME Bottom Bay:APS Back Plane Is Engaged
Note APS functionality is built into the MGX 8830. Therefore, you do not need to install a separate
APS connector in the switch in order for APS to function.
Step 5 Enter the addapsln command as follows:
mgx8850b.1.PXM.a > addapsln <workingIndex> <protectIndex> <archmode>
Replace workingIndex and protectIndex with the location of the working and protection lines, which
must be entered in the format: slot.bay.line. Because the SRM SONET/SDH configurations provides one
line, the working and protection indexes can only have one possible for value for a specific switch and
bay. Table 5-3 shows the proper values to enter for each switch and bay combination.
Replace archmode with an option number that defines the type of line redundancy you want to use.
Table 5-4 shows the option numbers and the types of redundancy they select.
Table 5-3 Working and Protection Indexes for addapsln Command
Switch Type and Bay Working Index Protection Index
MGX 8830 7.1.1 8.1.1
MGX 8850 (PXM1E/PXM45), upper bay 15.1.1 16.1.1
MGX 8850 (PXM1E/PXM45), lower bay 31.1.1 32.1.1
Table 5-4 APS Line Architecture Modes
Option Description
1 Selects 1+1 Bellcore GR-253 APS protocol signaling (transmission on both working and
protection lines).
2 Selects 1:1 Bellcore GR-253 APS protocol signaling (transmission on either the working
line or the protection line) for intracard APS.
Note This option is not supported in this release.
3 Selects 1+1 ITU-T G.783
1
AnnexB APS protocol signaling (transmission on both
working and protection lines).