Functional description
158 MPR-e
Figure 55: Available loopbacks
The following loopbacks are provided by the MPT-HC V2 or MPT-MC or MPT-XP:
• Line Side loopback: this loopback routes data from the output of the Tx Data
Awareness block (after compression) to the input of the Rx data awareness block
(decompression). This is an internal loopback.
• It is a Loop and Continue loopback. It is possible to enable this loopback only at
aggregate level.
When this loopback is activated, the behavior is as follows:
→ TDM2TDM and TDM2ETH flows are forwarded back to the 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.
Loopback activation
The loopback can be activated by locally or remotely. The activation command also defines
the duration of the loopback (time-out).
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