Coverage prediction

The coverage prediction section gives a multiplex-by-multiplex view of the transmission channel and reception prediction for each transmitter that is expected to provide a usable signal (i.e. a prediction of at least 50) on at least one multiplex at the address or postcode centroid at any time during the switchover process. The prediction is repeated each time the switchover process gives rise to a change in transmission channel or the reception prediction changes significantly.

Two reception predictions are provided for each multiplex:

The higher the prediction figure, the better the reception margin and hence protection against interference.

A multiplex will be flagged as green where the "Served" prediction is at least 70, which is the threshold for the reception of a multiplex to be considered sufficiently reliable to qualify as a service.

A multiplex will be flagged as amber where the "Served" prediction is less than 70, but the "Marginal" prediction is at least 70. In this situation there is sufficient signal to receive the multiplex, but reception is likely to be subject to periodic interference from other more distant transmitters on the same channel. A decision can be made as to whether this reduced quality of service will be acceptable to the customer.

A multiplex will be flagged as red where the "Marginal" prediction is at least 50 but less than 70. In this situation the multiplex may be received, but reception is likely to be subject to significant periods of interference from other transmitters on the same channel. It is unlikely that the quality of service would be acceptable for the majority of customers.

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