Huawei OptiX OSN 3500 - Page 32

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 Type of loopback
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SDH NE equipment
Line
Tributary Tributary
Inloop
Outloop
Outloop
Inloop
Tributary
SDH NE equipment
Line
Line
Tributary
Tributary
Inloop Non-loopback Outloop
Loopback Operation
 Software loopback: set via NMS;
 Hardware loopback: set using tail fiber and self-loop cable manually.
 Inloop: route signals from XC back to XC;
 Outloop: route signals away from XC back to interface port.