Answer Posted / silpa
There are two forms in which ISDN is supplied.
Basic Rate
• Access to the network is called Basic Rate Access (BRA).
• It is provided through a Basic Rate Interface (BRI).
• This kind of interface is also called an S0 Interface.
• There are two channels that you can use.
Primary Rate
• Access to the network is called Primary Rate Access (PRA).
• It is provided through a Primary Rate Interface (PRI).
• This kind of interface is also called an S2 Interface.
• There are either 30 channels (most of the world) or 23 channels (North America, Japan) that you can use.
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