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Chapter 4
Configuring Channelized OCx/STMx
Interfaces
Overview
SONET APS and SDH MSP
MDL/FDL Support
Use the procedures described in this chapter to configure channelized OC3/STM1
and OC12/STM4 (cOCx/STMx) interfaces on E Series Broadband Services Routers.
This chapter contains the following sections:
Overview on page 109
Platform Considerations on page 112
References on page 117
Before You Configure an Interface on page 118
Configuration Tasks on page 119
Configuration Examples on page 142
Testing Interfaces on page 145
Monitoring Interfaces on page 153
Channelized OC3/STM1 and OC12/STM4 interfaces are supported by the modules
described in this chapter.
This section describes the features of cOCx/STMx interfaces.
The router supports Automatic Protection Switching (APS) and Multiplex Section
Protection (MSP) on selected I/O modules that provide SONET/SDH connections. This
feature provides a redundant connection if a primary SONET/SDH connection fails.
For a list of I/O modules that support APS/MSP, see ERX Module Guide, Appendix A,
Module Protocol Support. For an overview of APS/MSP, see "Bidirectional Switching
Mode" on page 75 in "Configuring Unchannelized OCx/STMx Interfaces" on page 73.
Interfaces on cOCx/STMx line modules support maintenance data link (MDL) messages
at the T3 level and facilities data link (FDL) messages at the T1 level. For a list of the
109
Overview
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