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A Psub number is the facility to have additional TurboID (MAN) Numbers attached to an existing connection. It's a bit like having additional phone numbers that if dialled, ring the same phone.
Like the Transcomm/Mobitex network, Turbo Exchange also supports PSubs, although one of reasons why you may have had a Psub in the past is now redundant. This is where you may have had two Modems or Modem & IAS for backup, but just one publicly identifiable MAN number regardless of which method of connection was in use.
Psubs for distinguishing between different depots using one connection is supported, and is available on request.