[c-nsp] Re: [nsp] What WIC to use with E1 service

[Krzysztof Adamski]

Well, I got the circuit delivered (E1 on Belgium end and T1 on my end),
but I still have not been able to get a strait answer what I need to put
in the cisco2621.

I got some pictures of the box that Belgacom installed, it is DNT2M, it
has a port marked G.704/2M next to an RJ45 plug.
It also has a sticker with:
14HER0+ DNT2M 5C
02WOL0+ 14HER0+ 30N 2P

I was told by GT/360 that it is HDB3 and E1/CRC4

Any ideas what WIC I should use, and what configuration I should have.

K

On Sat, 8 May 2004, Stephen J. Wilcox wrote:

> On Sat, 8 May 2004, Gert Doering wrote:
>
> > Hi,
> >
> > On Sat, May 08, 2004 at 09:55:58AM -0400, Krzysztof Adamski wrote:
> > > > Other carriers (COLT, for example) usually deliver "unframed" only
> > > > anyway...
> > >
> > > The circuit is being delivered in Belgium by FranceTelecom.
> >
> > I have no experience with them.  Sorry.
> >
> > > On my end it is delivered by 360, and it looks like the people that I'm
> > > dealing with have not done this before, so extracting recommendations from
> > > them is difficult. Every answer has "this should work" instead of "this
> > > will work".
> >
> > Expect "it will not work, and nobody can tell you how it was supposed to
> > work in the first place" :-(
> >
> > > Here are the options that 360 told are available:
> > >
> > > E1: G.703/G.704 framed or G.703 unframed
> > > hence framing options: CRC4 or NO-CRC4
> > > coding: AMI or HDB3 (HDB3 most common for data)
> > >
> > > The E1 will be used just for data and will terminate on a T1 on my end.
> > > The other mystery is how will the E1 be changed into T1 on my end?
> >
> > Now this is interesting.  I have no idea how this is planned, but they
> > might try something like this:
> >
> > The E1, when run with G.703/G.704 framing, has 32 timeslots, 64kbit/s
> > each.  Of those, *up to* 31 can be used for data - on a VWIC-Interface,
> > this is configured as, for example
> >
> > contr e1 0/0
> >   channel-group 0 timeslot 1-31
> >
> > to use 1984 kbit/s (the maximum for E1 / framed - ts 0 is used for frame
> > sync).
> >
> > T1 has 23 timeslots.  So it *might* work if you just use
> > "channel-group 0 timeslot 1-23"
> > on the E1 end, and the telco has some multiplexing device that takes
> > 23 individual DS0's from the E1 side, and feeds them into the T1 side.
> >
> > All of this is guesswork, of course.  You need hard data how they
> > do the E1/T1 conversion to decide how to configure your end.
>
> Probably correct tho.. the E1/T1 framing are incompatible. Afaik most people
> doing this usually order one type of circuit and apply a convertor on one end,
> this may be the safer option if the carrier is unclear on how or if this will
> work.
>
> Steve
>