Nokia 9500 MPR User Manual page 1029

Release 7.0.0 3DB 19286 ACAA Issue 01
WebEML User Manual
70 Radio Facing Circuit Loopback
70.1 Purpose
This chapter provides instructions to perform Radio Facing Circuit Loopback for the
9500 MPR.
70.1.1 General
Radio Facing Circuit Loopback mode uses the receive data interface signal on the
MPT-HC/MC/HC-HQAM/XP/XP-HQAM Transceiver and replaces the signal to be
transmitted by the MPT-HC/HC-HQAM/XP/XP-HQAM or MPT-HLC/HLS
Transceiver and sends the receive signal back to the far-end Transceiver.
This is an external loopback.
Radio Facing Circuit Loopback is only possible to enable on the aggregate traffic.
This loopback is a Loop and Continue.
Transmit traffic will be dropped.
When this loopback is activated the expected behavior is as follows:
Note: All procedures are shown using the MSS-8 screen, however, the operation is similar
for all MSS shelves.
• TDM2TDM and TDM2ETH flows are forwarded back to Core card with source
and destination MAC addresses swapped.
− For TDM2ETH flows, where the ECID Tx and ECID Rx are the same value,
the loopback works.
− For TDM2ETH flows, where the ECID Tx is different form ECID Rx, the
loopback fails.
• Generic Ethernet flows are dropped.
Radio Facing Circuit Loopback
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