[Asterisk-Users] Channel bank replacement

Jerry jjones at quiddesign.com
Sat Apr 9 18:08:50 MST 2005


I enjoy using the Adit 600 with the new FXS cards via the controller T1 
interfaces. Works well. I do have concerns with using the CMG card via 
MGCP. Has anyone done this? How is it working?

On Apr 8, 2005, at 12:50 PM, Matt Schulte wrote:

> 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:peter at radioworldwide.org]
> Sent: Friday, April 08, 2005 12:23 PM
> To: asterisk-users at 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 [pdoyen at mnitx.com]. 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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