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Cisco ATM Services (AXSM) Configuration Guide and Command Reference for MGX Switches
Release 5.2, Part Number OL-6484-01 Rev. C0, September 2005
Chapter 2 Preparing AXSM Lines for Communication
General AXSM Provisioning Procedures
Channelization in SDH Networks Versus SONET Networks
SONET networks and SDH networks use different terminology to describe the same elements in a
channelized line. Table 2-10 lists the SONET terms and their equivalent SDH terms.
SONET path and interface numbering is different from SDH path and interface numbering. Table 2-11
defines the interface and path numbering for SONET and T3 lines, and Table 2-12 defines the interface
and path numbering for SDH lines.
Note The term “DS3” is used for both T3 and E3 lines.
Note The bay is always 1.
Tip Enter the dsppaths -all command to see the path identifies for all paths on the current card.
Table 2-10 SONET Terminology versus SDH Terminology
SONET term Equivalent SDH Term
STS-3 STM-1/AU-4
VT Tributary Unit (TU) or Virtual Containers (VC).
VTG TUG
VT 1.5 TU-11
VT 2.0 TU-12
Table 2-11 Interface Numbering in SONET Networks
SONET Path Type Path Number
STS paths bay.line.sts
DS3(T3)/E3 paths bay.line.ds3
Table 2-12 Interface Numbering in SDH Networks
SDH Path Type Path Number
AU paths bay.line.AU
DS3(T3)/E3 paths bay.line.ds3
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