Subj : Re: Serial Port: YouTube over Dialup
To   : poindexter FORTRAN
From : Bob Worm
Date : Mon Oct 20 2025 11:38:09

  Re: Re: Serial Port: YouTube over Dialup
  By: poindexter FORTRAN to Bob Worm on Sat Oct 18 2025 15:12:30

Hi, pF.

 > You could - ISDN Primary Rate Interface was 23 64K channels plus a 8k D
 > channel. we used Ascend Pipeline routers that'd bring in a PRI on one side
 > and accept connections from users with BRI lines on available channels -
 > then route them to our network.

Thanks for the explanation - every day's a school day and it's always more interesting to get a real life answer than to look it up on Wikipedia (no offence to Wikipedia, I love that site).

I'm surprised the PRI's D channel was only 8k - seems like having the same size D channel for a BRI with two bearers vs. 23 would be a bit generous. My memory has disappeared down the time tunnel a bit but I thought European PRI were 30 x 64k B channels + 2 x 64k D channels to make it up to 2048k. Maybe you need to lose some for framing *shrug*. Come to think of it, I could have sworn BRI had a 16k D channel?

I met up with some of the (other) old fogies from my time in Alcatel-Lucent the other week, maybe the next time I see them I'll bring up TDM and watch their eyes light up...

BobW
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