Switch access architecture for quad voice lines with data on-demand per ISDN BRI

A single international-standard ISDN (integrated services digital network) basic rate interface (BRI) has been arranged so that a data terminal and either two, three, or four voice terminals can be operated simultaneously through the interface. The switch access architecture for quad voice lines with data-on-demand ISDN BRI (basic rate interface) is introduced. The BRI S/T interface bit framing requirements and the Q.931 call control procedures required for the new service are discussed. The results show that relatively simple additional hardware could be used to upgrade an existing ISDN 5ESS switch to quad voice lines with data capability per BRI.<
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