A primary rate (PRI) ISDN line is designed to provide ISDN facilities to corporate EPABX extensions or access to a Server computer / corporate Intranet.

A PRI ISDN line supports 30 B channels and depending on bandwidth requirements, for any one communication any combination of B channels - up to 30, can be used.

The bit transmission rate on a PRI ISDN link is 2 Mb/s with time slot structure same as that of a normal TDM / PCM link used for inter-exchange junctions. So, the link is supported either on copper cable with Digiplexers at both ends, or on all standard media used for inter-exchange links e.g. optical fibre, microwave, satellite etc.

The PRI ISDN line is terminated onto NT2 at the Customer’s premises.
( NT2 is to be provided by the customer )

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