User Manual
Product information and planning
9500 MPR Rel. 3.1
3DB18809AAAA Issue 1170/980
– Generic Ethernet flows are dropped.
The Core facing radio loopback operation implies the "Automatic Tx mute" before the execution
of the command and the "Tx mute removal" after the execution of the loopback command.
2) Radio facing Circuit loopback: remote loopback allows an over-the-air loopback test to be per-
formed when the modem is operating in a continuous mode.
The loopback is internally provided by the MPT FPGA and connects the Receive data interface
to the Transmit data interface.
This is a line external loopback. This loopback is a Loop and Continue.
It is possible to enable this loopback only at aggregate level.
When this loop is enabled the expected behavior is the following:
– Compressed flows (TDM2TDM,TDM2ETH and ATM PW) are forwarded back to Core
module with proper assignment of source and destination MAC addresses (e.g. incoming
MAC SA is used as MAC DA for looped frame, while MAC SA in the looped frame is the
MAC assigned to slot hosting radio card).
– For TDM2ETH flows the loopback works only if the ECID Tx and ECID Rx are the same,
in case of ECID Tx is different form ECID Rx the loopback doesn't work.
– For ATM PW flows the loopback works only if the Inbound and Outbound PW Labels are
the same, in case they are different the loopback doesn't work.
– Generic Ethernet flows are dropped.
2.8.12.8 Loopback activation
The loopback can be activated by each management system (local or remote). The activation command
permits to define the duration of the loopback (time-out).
The two loopbacks (Core facing and Radio facing) cannot be supported at the same time.
The time-out period starts at the activation time and expires at the end of the period spontaneously in the
NE, a part for the case in which another reconfiguration of the time-out period is requested at the operator
interface during the activation time. In this case, if the loopback point 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.
2.8.12.9 Loopback life time
In order to avoid the risk of a permanent disconnection from ECT/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.
A default time-out period may be suggested at the operator interface, even if it could be modified on user-
needs basis.
After the NE reset, the activation of each loopback point is lost and must be recreated again if needed,
starting with a new time-out period.
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