X.25 can
be carried over the B or D channels of a BRI line, and over the B
channels of a PRI line. X.25 over the D channel is used at many
point-of-sale (credit card) terminals because it eliminates the modem
setup, and because it connects to the central system over a B channel,
thereby eliminating the need for modems and making much better use of
the central system's telephone lines.
X.25 was also part of an ISDN protocol called "Always On/Dynamic ISDN", or AO/DI. This allowed a user to have a constant multi-link PPP connection to the internet over X.25 on the D channel, and brought up one or two B channels as needed.
X.25 was also part of an ISDN protocol called "Always On/Dynamic ISDN", or AO/DI. This allowed a user to have a constant multi-link PPP connection to the internet over X.25 on the D channel, and brought up one or two B channels as needed.
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