Functional description
MPR-e and MSS-1c User Manual 3DB19901EFAA Edition 01 153
3.10.8.7.1 — MPT-HC/HC-HQAM/XP/XP-HQAM in XPIC with a generic indoor unit
XPIC configuration allows a generic indoor unit (e.g. 7705 SAR) to take advantage of both
double capacity and hardware redundancy. In fact, the indoor unit can exploit two times the
same radio channel doubling the total amount of traffic transported. Moreover, whenever
one of the two MPR-e fails, the indoor unit can collapse all its traffic on a single MPT. In
case remaining working MPR-e is under congestion, MPR-e QoS function will handle the
situation and high priority traffic will be served as first in accordance to the selected
scheduling policy.
It has to be noticed that this configuration offers two parallel links, but it is left to the indoor
unit the detection of radio problem/failure by the means of any kind of OAM protocol at
layer 2 or 3 which will transparently pass through the radio link and are received at the other
end.
3.10.8.7.2 — Auto Tx mute of MPT-HC/HC-HQAM/XP/XP-HQAM 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.
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