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Livingston Portmaster 3 PM3A-1E is a RAS (Remote Access Server) that: - terminates one 1E line (30 B-channels) - provides ISDN dial-up on those channels - pr
by Terretta 4y ago
Livingston Portmaster 3 PM3A-1E is a RAS (Remote Access Server) that:
- terminates one 1E line (30 B-channels)
- provides ISDN dial-up on those channels
- provides DSP based modems in case analog modem calls should be handled
This was a key component of being an ISP in early days.
https://osmocom.org/projects/retronetworking/wiki/Livingston_Portmaster_3 https://osmocom.org/projects/retronetworking/wiki/Livingston...
- deleted 4y ago[deleted]
- mlyle 4y agoI just bought an AS5300 to play with a few months ago to see if I could get 56k modem connections to work over VOIP. SIP channels -> voice card -> out a T1 (network) -> in another T1 (CPE) -> to DSP modem. (Or dialout, DSP modem -> out a T1 (CPE) -> in a T1 (network) -> voice card -> SIP. It just -doesn't quite- work. I can get 14400 no problem, but V.90 doesn't seem to entrain. Still troubleshooting (could be undesirable jitter buffer settings on my ISP side). I just barely missed end-of-sales of ISDN BRI in my area which could have been useful for get to the PSTN at high quality.