previous |
start |
next
Integrated Services Digital Network (ISDN)
ISDN provides an all-digital replacement for the PSTN. ISDN is now
widely available in Australia from Telstra Corporation (although
not from other telco providers), and most Telstra customers now
have the option of choosing it instead of PSTN.
The basic-rate ISDN service provides,
conceptually:
An ISDN service is integrated in the sense that
each B channel can be used to carry either a digitised voice (or
video, FAX, etc) call, or a 64 kbps data call. The D channel is
normally used for signalling (call setup, etc), but can be used as
a 16 kbps data link under some circumstances. Although....
Note that in Australia, the ISDN interface is
owned by the telecommunications provider (or Telco), eg Telstra.
This is not the case in some other countries.
previous |
start |
next