Functional description
156 MPR-e and MSS-1c User Manual 3DB19901EFAA Edition 01
• TDM2TDM and TDM2ETH flows are forwarded back to the MSS-1c or
Ethernet generic Device with the source and destination MAC addresses
swapped. For TDM2ETH flows, the loopback works only if the ECID Tx and
ECID Rx are the same. If the ECID Tx is different from the ECID Rx, the
loopback does not work.
• Generic Ethernet flows are dropped. (This includes the ETH2ETH flows).
• Radio facing loopback: this remote loopback allows an over-the-air loopback test to
be performed when the modem is operating in a continuous mode.
The loopback connects the Receive data interface to the Transmit data interface.
This loopback is a Loop and Continue loopback. It is possible to enable this loopback
only at aggregate level.
When this loopback is enabled, the behavior is as follows:
• TDM2TDM and TDM2ETH flows are looped back with the source and
destination MAC addresses swapped. For TDM2ETH flows, the loopback
works only if the ECID Tx and ECID Rx are the same. If the ECID Tx is
different from the ECID Rx, the loopback does not work.
• Generic Ethernet flows are dropped.
3.10.8.11 — Loopback activation
The loopback can be activated by locally or remotely. The activation command also defines
the duration of the loopback (time-out).
The time-out period starts at the activation time and automatically expires in the NE at the
end of the period, unless another reconfiguration of the time-out period is requested at the
operator interface during the activation time. If the loopback is still active because the
activation time-out is not expired yet, the time-out period is reconfigurable and the
specified time range starts again from the new updated activation date, overwriting the
previous activation date and time-out values.
After the NE reset, the activation of each loopback is disabled and must be recreated again
if needed, starting with a new time-out period.
3.10.8.12 — Loopback life time
In order to avoid the risk of a permanent disconnection from MCT/NMS of a remote NE
after the execution of a loopback, a time-out mechanism is supported.
The management system's operator has to provide the time range of the loopback time-out
period expressed in hours/minutes starting from the time of the loopback activation.
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