[asterisk-users] t1 cards

[Gordon Henderson]

On Fri, 3 Oct 2008, Eric Fort wrote:

> yes, more than 300 meters (longer than copper based ethernet allows).  Yes
> to E1, as I understand it, it's just a config change on many cards anyway.
> I'm specificly looking at pci based t1/e1 cards because I'm finding single
> port cards on ebay going for 100-200 usd.  in some cases I may want to drive
> a channel bank at the far end, thus t1/e1.  anyone have experience on how
> far these pci based cards will drive when wired back to back?

Looks like this is the thing then:

   http://www.blackbox.com/Catalog/Detail.aspx?cid=381,1452,1468&mid=5362

Just over $1000 a pair...

couple that with an OpenVox PRI card at one end, channel bank at the 
other, and off you go...

Gordon


>
> Eric
>
> On Thu, Oct 2, 2008 at 11:34 PM, Gordon Henderson <
> gordon+asterisk at drogon.net <gordon%2Basterisk at drogon.net>> wrote:
>
>> On Thu, 2 Oct 2008, Eric Fort wrote:
>>
>>  I presently need to connect a few channels of voice and data between
>>> multiple locations where I own the copper between them.  Each location
>>> exceeds 300M from any other location.  I'm thinking of generating T1's and
>>> running those between locations.  If I use PC based cards wired back to
>>> back
>>> (I can do that, right?) what kind of distance can I expect to be able to
>>> span without needing repeaters?  What inexpensive cards can you recommend
>>> for use with asterisk?  I'm considering either digium or sangoma.  Would I
>>> get any better performance if I used a sync-serial card connected to a
>>> separate csu/dsu?
>>>
>>
>> 300 metres, right? (not 300 miles?)
>>
>> Why stop at T1? Go for E1 :) with the right kit at each end you ought to be
>> able to get 2Mb/sec or more. (distance depending)
>>
>> Personally, I'd go for a technology that gave me Ethernet at each end -
>> then it makes it much easier to mix voice and data - But using something
>> like a sync. modem and line driver then you need a media converter of some
>> sorts at each end which might bump up the cost - at the savings of the E1
>> card in the PC though. Last time I had bare copper to play with (a BT EPS8
>> circuit) I had a 2Mb modem at each end going into a Cisco 2600 which was
>> running CHDLC over the link and acting as nothing more than a dumb media
>> converter to give me Ethernet at each end. This was 6 years ago though.
>>
>> Ah, Looks like the technology has improved somewhat:
>>
>>  http://www.blackbox.com/Catalog/Detail.aspx?cid=381,1452,1468&mid=5261
>>
>> From the UK site:
>>
>> Or even:
>>
>>  http://www.blackbox.com/Catalog/Detail.aspx?cid=425,1423,1424&mid=4946
>>
>> (same thing from the UK site:)
>>
>>
>> http://www.blackbox.co.uk/solutions/display.asp?cs=dvh&id=1&doc=lb300a-r2&tx=LAN&sx=Network%20Appliances
>>
>> You need a pair, obviously...
>>
>> Hm. US site is $305, UK £253. Rip-off Britain again by the looks of it....
>>
>> As for inexpensive cards - OpenVox. Their E1 cards seem to work OK, but if
>> using a LAN extender, then they're not neeed at all...
>>
>> Gordon
>>
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>