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Figure 3-2 TDM Loopback Setting Pane
4. Select a slot number, set Loopback Time and Loopback Type.
For detailed information of the loopback types supported by TDM ports, refer to
3-1.
Table 3-1 Loopback Types Supported by TDM Ports
Port Type
E1 electrical
port
5. Click the Apply button, and verify that the BER is zero.
3.2 Checking the Ethernet OAM Function
Ethernet Operation, Administration and Maintenance (OAM) involves fault management
and performance management.
maintenance personnel rapidly locate the fault and find out the fault cause. Performance
SJ-20150804150350-006|2015-09-17 (R1.0)
Loopback Type
l
Loopback off
l
Inner loopback
l
Outer loopback
When a fault occurs in the network, OAM helps
3-3
Chapter 3 Fault Locating Methods
Description
Inner Loopback: The loopback test is implemented at
the remote electrical port. This loopback type is used
to check whether the E1 service towards the remote
service board is normal. It also helps check whether
the cables connected to the remote service board are
normal.
Outer Loopback: The loopback test is implemented
at the local electrical port. This loopback type is used
to check whether the E1 service entering the local
service board is normal. It also helps check whether
the cables connected to the local service board are
normal.
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