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PRI ISDN
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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