The PRI ISDN (Primary Rate Interface Integrated Digital Subscriber Network) comprises 23 64Kb/sec. ISDN B channels and one 64Kb/sec D channel, yielding a maximum data throughput rate of. Note that 1.544Mb/sec this is the same as a T-1 line. To achieve this completive performance, the channels must be bonded. Unlike a T-1 line, it is circuit switched. A T-1 line is dedicated between two points.
To accomplish this, a NT2 device terminates the line and performs the multiplexing and switching on the customer site.
Generally, PRI lines can be found on the incoming side of corporate networks, to provide access to telecommuting employees equipped with ISDN lines at home, or on the incoming side of an ISP that serves users connecting to the ISP via ISDN (usually as an extra-cost option over dial-up service).
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