Basic Rate Access (BRA) is used when two channels are required, and consists of two products ISDN2 (used for digital equipment) and ISDN2a (used for digital and analogue equipment). BRA offers two 64 kbps channels (or 128 kbps when bonded) and one 16 kbps channel (known as the D Channel). The B Channel may be used for voice; data, video or image communications by the user and the D channel is used for signalling. The two B Channels that are available can be used simultaneously and independently, for example; you may use the Internet, receive a phone call, send or receive a fax – any two at the same time
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Primary Rate Access (PRA) is used when thirty channels are required. The ISDN30 service is applicable and offers 30 B Channels of 64 kbps each and one 64 kbps D Channel, which is used for signalling.
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