Re: PRI, T1, E1 daffynitions (was Re: (PM) No answers!)

Richard Morrell (portmaster@ednet.co.uk)
Fri, 5 Feb 1999 01:04:12 +0000 (GMT)

On Thu, 4 Feb 1999, I don't work for Lucent RABU wrote:

> PRI == 23b + 1d
> E1 == 30b + 2d
>
> Why? Because PRI is on T1 and E1 is E1 (Is the E1 ever called Euro-PRI?)

I'm afraid this is slightly out.

PRI != 23b + 1d
E1 != 30b + 2d

PRI == Primary Rate ISDN
T1 == a 1.544Mb/s digital circuit used in the US (and other places)
E1 == a 2Mb/s digital circuit used in Europe (and other places)

PRI delivered over T1 == 23b + 1 (64k) d
PRI delivered over E1 == 30b + 1 (128k) d

Yes, PRI over E1 is sometimes called Euro-ISDN but only by American
companies selling their products over here. :-P

> from http://www.totaltelcom.com/Glossary/p.html

Your references are correct, but slightly ambigous (which might have
caused the confusion).

Sorry to be a pedant...

--
Richard Morrell                                           richard@ednet.co.uk
System Administrator - edNET: Internet Access for Edinburgh - www.ednet.co.uk




-
To unsubscribe, email 'majordomo@livingston.com' with
'unsubscribe portmaster-users' in the body of the message.
Searchable list archive: <URL:http://www.livingston.com/Tech/archive/>