Functional description
156 MPR-e
Auto Tx mute of MPT-HC V2/MPT-XP in XPIC
When XPIC is configured, a self protection mechanism is in place over the entire radio link
which automatically reacts in case of either local or remote failure. Each MPR-e is capable
to mute its transmitter whenever its peer at the other end (MPR-e H or MPR-e V) fails (under
certain conditions). Such mute is necessary to continue ensuring the working condition of the
link. In fact, signal cancellation cannot be accomplished anymore if an MPR-e fails. So its
corresponding peer at the other end shall be muted.
To make this happen, each pair MPR-e H and V has a real-time communication always
running which makes each MPR-e aware of its mate status. As an example, when remote
MPR-e H fails, remote MPR-e V detects the anomaly and advertises through the radio link
the counterpart MPR-e V. Then, local MPR-e V alerts its mate (local MPR-e H) requesting
to mute its transmitter.
Figure 54: Auto TX mute in XPIC configuration
1+1 Hot StandBy
When protection is switched in 1+1 HSB configuration, the spare ODU module is squelched.
HSB Switching Criteria
The switching criteria are:
• MPT Access Card Fail status
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