Word of warning, get the version 5 or higher FXS cards with the
ADIT600,
else you will have echo problems. This is just from personal
experience.
Supposedly the 5 and higher cards have dynamic impedance adjustment,
it's worth it.
Matt
-----Original Message-----
From: Peter Hoppe [mailto:[EMAIL PROTECTED]
Sent: Friday, April 08, 2005 12:23 PM
To: asterisk-users@lists.digium.com
Subject: [Asterisk-Users] Channel bank replacement
Thank you so much for your answers already, I really appreciate it!
I have looked into using an Adtran Total Access 750 platform instead,
but got away from that idea after I saw the totally confusing amount of
options of different modules I can buy. The Adit 600 seemed so much
simpler to put together. Also, the Adit 600 had such an excellent
appraisal in the asterisk voip-info - see
http://www.voip-info.org/tiki-index.php?page=Asterisk%20Channel%20Bank
But maybe I need to come back to the Adtran TA750. Unfortunately that
platform seems to only offer 24 fxs ports per unit and I need to buy an
expensive T1 card. I would buy the Digium T1 card - it seems that it is
by far the least expensive card, but $500 is still something. That's
why
I toyed with the Adit 600 plus cmg card - all I need is a standard
network card on the Asterisk machine.
We have sorely abandoned the idea of using an extensive amount of voip
phones on the property, as we are not a homogenous office setup (ppl
also live on the property).
This solution would mean
* putting in an entire new cat5 network. I would be the person who
would
have to put it all in place - When would I be finished? In 2 years? 4
years? 10 years?
* lots of admin hassle to enable all the phones / add new phones /
remove phones
* users can't easily extend stations at end points. With two wire phone
they simply switch one parallel to the existing one - no admin hassle /
extra hubs etc.
* two wire technology enables us to buy almost any phone available.
* security concerns with the SIP protocol. See
http://secunia.com/advisories/8169/ as an example
* users potentially plugging their laptops into the voip sockets and
browsing/downloading away => lots of setup/admin hassle with the
firewall (how do you block Kazaa?)
* Phones potentially breaking when users unplug power during firmware
download. For example, this is an issue with the Grandstream phone.
The only alternative that seems feasible at the moment would be
* a different channel bank than the adit 600 or
* a voip gateway that multiplexes many fxs ports into one ethernet
connection. But before I would go down that route I would have to be
absolutely sure that the SIP conforms to the standard, the upgrades are
free and the fxs ports are compatible with uk standard two wire phones.
I found that some two wire phones actually use 4 wires - confusing
* a bank of ATAs (handytone 286 or similar). I *really* don't like that
solution, as it is a bad botch job and throws lots of issues like which
REN they have, many power supplies (or one big one). I really ought to
be red in the face for even mentioning that solution. But if nothing
else is available, I would probably have to buy them in bulk, take the
boards out and mount them in a 19'' box together with a hub so I build
my own voip gateway :) maybe it's not so botch after all :) )
For connection to the PSTN: We have three BT lines, and again, we would
not like to move over to a different technology like ISDN. The lines
work for us, and 'if it ain't broke, don't fix it'. We would use three
Sipura SPA-3000 interfaces to connect them to the internal network. The
SPA-3000 is sold in the UK and has the CE approval, so it should
legally
be ok. I am experimenting with one unit at the moment, and am smacked
by
the literally hundreds of options it has. But I heard good reports
about
that one, so I expect it to work well in our setting.
Hi Peter, I'm not sure how you are getting PSTN lines into your * box,
but if
it's not ISDN30, you might want to consider some of the cheap IAX
phones on
the market now rather than trying to soldier on with old analogue kit?
e.g. http://www.iaxtalk.com/product_info.php?cPath=1&products_id=29
Shipping for 30 units and UK power supplies was $340, and with the
weak dollar
right now, that works out at just over 40 quid per phone - I'm sure
there's
movement on the unit price when buying in bulk...
Now remove the need for an Asterisk Quad-E1 / T1 interface card and
you've
dropped the cost by nearly a grand.... food for thought :)
They also sell a single-ethernet-port version of the phone for $10
less if you
have enough ethernet sockets.
Cheers,
Gavin.
I got an Adtran 600 with 12 X FXO and 12 X FXS cards for $495 from
Penny Doyen [EMAIL PROTECTED] With the strength of the pound, that
would practically be free to you!
Chris Mason
Date: Fri, 8 Apr 2005 17:42:56 +0200
Maybe following options:
1-) Get another channel bank from ebay at low cost. Which will also
need another T1 card;
2-) Use 40 voip phones at 50 USD each and you no longer need the card
neither the channel bank. But a reliable local network ;
Hello,
I am working for a charity in the UK and I am projecting a new phone
system.
We would like to connect our two-wire telephones (40 or so) to an
ADIT 600 channel bank, and connect that into an Asterisk box via the
CMG card or T1 card.
I have been in talks with Carrier Access about the purchase of a new
channel bank and we tried to get a minor version of it first for
testing with the intention of upgrading to the full product if we are
happy with it.
Unfortunately since a few months I cannot get any further with CAC,
as they keep not coming back to us on how we proceed. I feel that the
channel bank would be the best solution, but it seems that we are
just to small fish to fry for them.
So - would there be any other way to connect 40+ telephones (two
wire) into an asterisk box? Are there any voip gateways that actually
conform to SIP standard (unlike what I heard from the Mediatrix voip
gateways 1124 and 1204 which seem to use non standard SIP and have
pay-as-you-upgrade)?
Thank you very much for your consideration!
Peter Hoppe
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