H3C SR6600 Command Reference Manual

Also see for SR6600 SPE-FWM: Configuration guide Configuration guide Configuration guide Command reference Command reference

5-18You can troubleshoot an E3 channel by placing it in a loopback. The following are loopback modesavailable for you to test an E3 channel to different depths:z In an internal loopback, transmitted data loops back to the receiver end internally without beingsent to the line.z In an external payload loopback, transmitted data loops over the far end and back to the receiverend after going through the E3 framer.z In an external loopback, transmitted data loops over the far end and back to the receiver end beforegoing through the E3 framer.Related commands: display controller cpos e3.Examples# Enable external payload loopback on E3 channel 1 on interface CPOS 1/0/0. system-view[Sysname] controller cpos 1/0/0[Sysname-Cpos1/0/0] e3 1 set loopback payloade3 set national-bitSyntaxe3 e3-number set national-bit { 0 | 1 }undo e3 e3-number set national-bitViewCPOS interface viewDefault Level2: System levelParameterse3-number: Number of an E3 channel on the current CPOS interface, in the range of 1 to 3.0: Sets the national bit to 0 for national communication.1: Sets the national bit to 1 for international communication.DescriptionUse the e3 set national-bit command to set the national bit used on the specified E3 channel.Use the undo e3 set national-bit command to restore the default.By default, the national bit of an E3 channel is 1.Examples# Set the national bit of E3 channel 1 on interface CPOS 1/0/0 to 1. system-view[Sysname] controller cpos 1/0/0[Sysname-Cpos1/0/0] e3 1 set national-bit 1e3 shutdownSyntaxe3 e3-number shutdown