The number of Physical Communication Channel (Physcommchan or PCC) configured on this V5 link. V5 links are structured as 8000 frames per second of 32 timeslots each. A timeslot can carry voice data, or alternatively signalling, e.g. synchronization data, CRC's, or D-channel data. Timeslot 0 is always used for signalling by lower level layers of E1. For higher level signalling like D-channels, additional timeslots must be explicitly allocated - these are called physcommchans. Timeslots 16, 15 and 31 are available for this purpose. So, a V5 link can have from zero to three physcommchans. Timeslots are always allocated in the order mentioned above, that is the following configurations are possible: Timeslots allocated to v5LinkNumberOfPcc higher level signalling 0 - 1 16 2 16,15 3 16,15,31 Timeslots that are not used for signalling are available for voice data. So, a link can have from 28 to 31 voice data channels.