Frame Relay in parallel to ISDN BRI?

Added by laforge 4 months ago

I'm quite familiar with FrameRelay as used over PRI interfaces. In such setups, there is only FrameRelay, with one fat HDLC pipe over 30 concatenated timeslots. There is no D-channel, and there is only FR on the entire PRI.

However, I recently read in a German textbook that there was Frame Relay also for BRI lines, and that it was provided in parallel to the normal ISDN/Q.931 signaling. Basically there would be both LAPB and LAPF? Does anyone know more about this? Was it ever deployed anywhere?

Add picture from clipboard (Maximum size: 48.8 MB)