An ISP of their own (was RE: [rescue] Being jobless)

Dave McGuire mcguire at
Wed Jul 30 13:32:51 CDT 2003

On Wednesday, July 30, 2003, at 01:23 PM, Phil Stracchino wrote:
>>>>> The old T1 in the last building just arrived as 4 copper wires from
>>>>> the demark just like the phone lines. Dunno what "format" that was,
>>>>> but there was no internal electronics at all..
>>>> That would be HDSL.  1.5 megabits over two pairs, 2 megabits over 3
>>>> pairs, maximum range about 20,000 feet.
>>> I thought it was not, since the HDSL we have requires a box on the
>>> wall in our office. the old setup had 4 copper wires that came in off
>>> the pole and went right into a CSU/DSU.
>>   It's not.  HSDL didn't exist in 1972, and T1s sure did.  T1/DS1 is a
>> baseband digital protocol that runs relatively high voltages (compared
>> to POTS lines) over bare copper.
> 1972?  I must have misunderstood.  I guess i misinterpreted "just
> arrived".

   I wasn't suggesting *his* circuit was installed in 1972...I was 
saying that T1s were used as customer data circuits as early as 1972 
(and likely earlier, that's just the earliset one I've heard of) when 
HDSL didn't point was T1 != HDSL.

   I'm sorry if I was unclear.


Dave McGuire                 "You don't have Vaseline in Canada?"
St. Petersburg, FL                     -Bill Bradford

More information about the rescue mailing list