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Does ISDN need PBX

Updated: 11/1/2022
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15y ago

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I'm uncertain as to whether you're asking because you simply don't know or if you're trying to open a 'what might have been' debate. ISDN could integrate voice and data but the principal functionality was circuit-switched technology and so would require the use of layer 2 switching to disseminate call requests around a network; PBXs certainly provided layer 2 switching. There is a data capability but this really is a small-scale enterprise, it is used chiefly for signalling and low-rate user data eg keystrokes or things like (I'm guessing) chat windows. Data was inherent in the BRI and was only switched out of the same channel at the PBX where voice, data and signalling were separated but the point is that the data needed the PBX in order to implement that separation. ISDN was not well-equipped for large file transfers so it is unrealistic to consider its data capability as a peer of its telephony capability. Computer communications (it has to be stipulated, some years ago now) utilised the higher-rate B-channel and Frame Relay was a purpose-built protocol designed for B-channel computer communications but the ISDN solution never emerged as a dominant market player, I recall some mystifyingly high equipment and line pricing strategies had alot to do with it.

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Q: Does ISDN need PBX
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