[nsp] What WIC to use with E1 service

[Neil J. McRae]

Most telco's use a DACCS [we use Nokia at COLT] for sub 2M services. 

Note though that an E1 is not an SDH service it's a emulated PDH
service inside an STM-1, if its delivered via a SDH service [which is 
an SDH service] that's why on an E1 you need master/slave at either 
end of the link and on STM-1 you sync from the line at both ends. 
Coverting from T1 to E1 is relatively simple assuming both use 64K DS0 
[some use 56K] , the other way around is a real pain, especially if the 
user is using more than 20 channels. 

Regards,
Neil. 

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of 
> Stephen J. Wilcox
> Sent: 08 May 2004 22:22
> To: Gert Doering
> Cc: Krzysztof Adamski; cisco-nsp at puck.nether.net
> Subject: Re: [nsp] What WIC to use with E1 service
> 
> On Sat, 8 May 2004, Gert Doering wrote:
> 
> > On Sat, May 08, 2004 at 06:16:13PM +0200, Stephen J. Wilcox wrote:
> > > Probably correct tho.. the E1/T1 framing are incompatible. 
> > 
> > "inside" the line, there are DS0s (64kbit channels).  So 
> going through 
> > an TDM add-drop-multiplexer an fractional-E1-to-T1 
> conversion "should"
> > be doable...
> 
> Agree, but afaik most muxes used commonly by telcos dont go 
> down to sub-SDH levels (sub E1/T1) ie 64k which means this 
> service ends up being a special, or perhaps thats just my 
> impression from my small view of the world.
> 
> > > Afaik most people
> > > doing this usually order one type of circuit and apply a 
> convertor 
> > > on one end,
> > How would such a convertor look like?
> 
> http://www.google.com/search?q=t1+e1+converter&ie=UTF-8&oe=UTF-8
> http://www.rad.com/Article/0,6583,17705,00.html
> 
> 
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