25 Mar
2007
25 Mar
'07
8:10 p.m.
On 25 Mar 2007 at 21:30, Jay West wrote:
One end MUST be a digital connection. For 56K,
on the ISP end, the line must be ISDN, PRI, etc. Regular analog POTS line
won't work on the ISP end. In ADDITION, there can't be more than one analog
to digital transition anywhere in the circuit from source to destination.
Bridge clips will also invalidate 56K connections on POTS lines.
Apropos to the vintage aspect...
Telcos used to (maybe prior to 1990) offer copper-to-copper
connections for things like fire and burglar alarms. Some
enterprising souls were making a go of using these connections
instead of ISDN (probably over a short haul, it might work). I was
surprised at how quickly all of the RBOCs got rid of the all-copper
arrangement.
Cheers,
Chuck