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Loopback of PDH interface
Hardware loopback of PDH interface
Hardware loopback is generally inloop
Two positions: wiring area of subrack and DDF
Software loopback of PDH interface
The software loopback of PDH interface means to set outloop or
inloop for PDH interface via NMS
SDH NE equipment
Line
Line
Tributary
Tributary
Inloop
Non-loopback Outloop
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