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always on/dynamic ISDN (AO/DI)

Always On/Dynamic ISDN (AO/DI) is a service where the ISDN subscriber is always online and can have a higher bandwidth if required. The AO/DI technology uses the D channel of

ISDN for packet-switched transmission. The data rate of the D channel of 16 kbit/s is limited to only 9.6 kbit/s by the protocols

used, such as the Bandwidth Allocation Protocol (BAP), X.25 or Q.931. The user is constantly online via the packet-switched D channel. If the data rate of the D-channel is not sufficient, the two B-channels

can be switched on if necessary with Dynamic ISDN (DI) for a broaderband transmission. TheAO/DI concept was developed by the Vendors ISDN Association (VIA

) and can be operated on existing technologies without hardware changes in the network infrastructure. The AO/DI technology is characterized by high availability and cost-effectiveness and offers the user always-on operation to the Internet. Network operators and providers offer this service with flat rates.

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Englisch: always on/dynamic ISDN - AO/DI
Updated at: 03.03.2008
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