Re: Reminiscing our first internet connections (WAS) Re: akamai yesterday - what in the world was that

[Lyle Giese <lyle () lcrcomputer net>]

The fudge was required because of the use of copper based T1's. The 
early implementation required a min of 1's density for those old 
repeaters to work properly(AMI, Alt Mark Inversion). Conversion to fiber 
between telco offices allowed them to drop SF and AMI to ESF. Fiber 
equipment dropped the min 1 density to function properly.

Lyle

On 2020-01-27 06:11, Rob Pickering wrote:
> Wasn't the 56/64k thing a result of CAS (bit robbed) signalling which 
> was a fudge AT&T did to transport signalling information in-band on 
> T1s by stealing the low order bit for OOB signalling (it wasnt 
> actually every low order bit, but meant you had to throw away every 
> low order bit as CPE didn't know which ones were "corrupted" by the 
> carrier).
> Proper ISDN was always 64kbit/s clear path with separate D channels 
> carried OOB end to end, away from the B channel data.
>
> On Mon, 27 Jan 2020 at 11:57, Mark Andrews <marka () isc org 
> <mailto:marka () isc org>> wrote:
>
>     The hardware support was 2B+D but you could definitely just use a
>     single B.   56k vs 64k depended on where you where is the world
>     and which style of ISDN the telco offered.
>
>
>     -- 
>     Mark Andrews
>
>     > On 27 Jan 2020, at 22:32, Bryan Holloway <bryan () shout net
>     <mailto:bryan () shout net>> wrote:
>     >
>     > I didn't think one could get a single 'B' channel over ISDN ...
>     but I could be mistaken.
>     >
>     > In my early ISP days, ISDN was 2 x 64k (full-rate) 'B' channels
>     and a 16k 'D' channel for signaling.
>     >
>     >
>     >> On 1/26/20 5:58 AM, Joly MacFie wrote:
>     >> IIRC that 64k was in fact 56k with 8k for overhead.
>     >> I had one, and it would kick in a second channel if you pushed
>     it, for a whopping 112k. Metered, came out to about $500/mo.
>     >> Joly
>     >> On Fri, Jan 24, 2020 at 6:26 PM Ben Cannon <ben () 6by7 net
>     <mailto:ben () 6by7 net> <mailto:ben () 6by7 net <mailto:ben () 6by7 net>>>
>     wrote:
>     >>    I started what became 6x7 with a 64k ISDN line.  And 9600
>     baud modems…
>     >>    in ’93 or so.  (I was a child, in Jr High…)
>     >>    -Ben.
>     >>    -Ben Cannon
>     >>    CEO 6x7 Networks & 6x7 Telecom, LLC
>     >> ben () 6by7 net <mailto:ben () 6by7 net> <mailto:ben () 6by7 net
>     <mailto:ben () 6by7 net>>
>     >>>    On Jan 24, 2020, at 3:21 PM, bzs () theworld com
>     <mailto:bzs () theworld com>
>     >>>    <mailto:bzs () theworld com <mailto:bzs () theworld com>> wrote:
>     >>>
>     >>>
>     >>>    On January 24, 2020 at 08:55 aaron1 () gvtc com
>     <mailto:aaron1 () gvtc com>
>     >>>    <mailto:aaron1 () gvtc com <mailto:aaron1 () gvtc com>> (Aaron
>     Gould) wrote:
>     >>>>    Thanks Jared, When I reminisce with my boss he reminds me that
>     >>>>    this telco/ISP here initially started with a 56kbps internet
>     >>>>    uplink , lol
>     >>>
>     >>>    Point of History:
>     >>>
>     >>>    When we, The World, first began allowing the general public
>     onto the
>     >>>    internet in October 1989 we actually had a (mildly shared*) T1
>     >>>    (1.544mbps) UUNET link. So not so bad for the time. Dial-up
>     customers
>     >>>    shared a handful of 2400bps modems, we still have them.
>     >>>
>     >>>    * It was also fanned out of our office to a handful of
>     Boston-area
>     >>>    customers who had 56kbps or 9600bps leased lines, not many.
>     >>>
>     >>>    --            -Barry Shein
>     >>>
>     >>>    Software Tool & Die    | bzs () TheWorld com
>     >>>    <mailto:bzs () theworld com <mailto:bzs () theworld com>>        
>        | http://www.TheWorld.com
>     >>>    <http://www.theworld.com>
>     >>>    Purveyors to the Trade | Voice: +1 617-STD-WRLD       |
>     800-THE-WRLD
>     >>>    The World: Since 1989  | A Public Information Utility | *oo*
>     >> --
>     >> ---------------------------------------------------------------
>     >> Joly MacFie 218 565 9365 Skype:punkcast
>     >> --------------------------------------------------------------
>     >> -
>
>
>
> --
> --
> Rob Pickering, rob () pickering org <mailto:rob () pickering org>