[H-GEN] Beware the JabberRIMy my friend (X2/K56Flex/V90)

[Steve Pinel]

I was actually working at Telstra a few years ago when these things were being
put in, and helped do the design work (read - connect this black box to these
cables, turn on, and test according to some book I don't understand.  Design
means totally  different things in Telstra to the rest of the world).

RIMs (Remote Integrated Multiplexor) were designed to be an extension of an
exchange, and in theory, should give you equivalent service as if you were
connected directly to the exchange by copper.  Think of it as physically
locating part of the switching equipment out in the streets, and just run the
high speed 2Mbps fibre straight into the switcher.  Only one A/D between you
and the Exchange.  Hence the title Remote Integrated Multiplexor.

Very nice indeed

Except that the software we used to record (not control) such things couldn't
handle, so they decided to demultiplex the signal from 2Mbps back to 30
individual signals, and then feed them into the switch, which would convert it
to 2Mbps again, for a total of 3 D/A or A/D changes.

When they finally got their recording software working properly, they started
installing something they termed IRIM (Integrated Remote Integrated
Multiplxors), which works the way it was meant.  Meanwhile, there are probably
still quite a few RIMs still around in the streets.

In any case, Telstra only guarantees 9600 baud down their lines, so at 19k2,
they would probably say you're lucky.  Stiff cheddar about your 56k modem.

System-12 and RIMs are also made by different companies, and are a bugger to
get to work properly.

Hope there's no Telstra big nobs out there, as that was probably
Commercial-in-Confidence.  If my house turns into a smoking ruin, you know they
probably tracked me down.

James Lever wrote:

> A very interesting post from Christopher Burke to uq.general
>
> cheers,
> James
>
> ---
>
> Path: nargun.cc.uq.edu.au!bunyip.cc.uq.edu.au!not-for-mail
> From: zzcburke at uq.net.au (Christopher Burke)
> Newsgroups: bne.general
> Subject: Beware  the JabberRIMy my friend (X2/K56Flex/V90)
> Date: Thu, 07 May 1998 08:34:21 GMT
> Organization: University of Queensland
> Lines: 30
> Message-ID: <355171fe.66381762 at news.uq.net.au>
> NNTP-Posting-Host: zzcburke.dialin.uq.net.au
> X-Newsreader: Forte Free Agent 1.11/32.235
> Xref: nargun.cc.uq.edu.au bne.general:3155
>
> Well I have found out why I will never ever get better than V34 on my
> phone - its called a RIM and is used in new estates (last 5 years).
>
> I thought to myself that being 2kms from a brand new System-12
> exchange in a new suburb with new cables that I wouldn't have the
> problem, but not the case.
>
> A RIM is an amazing 'corner cutting' device that means all our local
> phone lines get digitised onto a fibre, then at the exchange all the
> lines get converted back to analog and then into the exchange which
> immediately digitises them again.
>
> So when you see the error on your X2 modem 'Multiple CODECS in
> channel' thats what it means - only one D/A or A/D conversion allowed
> between your modem and the ISP's system.
>
> Well I've got three, and whats worse if I dial up my other line in the
> house the best I get is 19.2k - you guessed it - because there is now
> 6 D/A or A/D lines.
>
> Apart from high speed modems, I will not be able to receive calling
> number display either - and who knows what other advanced facilities.
>
> So lesson of the day - if you want advanced comms facilities don't
> move into a new suburb.
>
> So if anyone else has this problem - e-mail me, maybe we will start up
> a RIM support group.
>
> C.L.Burke
>
> --
>
> James
>
> :>
> Computer Science/Music Student
> The University of Queensland.
> <e9322899 at student.uq.edu.au>
>
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