[Asterisk-Users] FXO/FXS card

[Luis Vazquez]

TC, please re-read my statement:
"T1 plus channels bank is a solution for USA but not ... other countries"

and note the "T1". 
So "T1" channels banks (the ones proved an referenced in the wiki, most of the list messages and all the asterisk documentation) are developed to be used in USA so their signaling (is only compatible with USA POTS signaling (whe have bought many CAC AccessBankI here, acceptable price, but only usefull for FXS). Same for Adtran channel banks as long as we have found in the internet. I guess this respond your last question on Marcelo's comments.

Respect to E1 channel banks: as stated by Marcelo E1 channels banks are not a clear option because of high costs, I've searched the internet and the lower price for these devices (with the FXO cards included ) is U$2000 and above. Not acceptable for a deal with a small/medium company with 6 to 12 FXO lines, lesser if you firt have to buy the product to test if you are lucky and it works with Asterisk (as is stated many times by mainstream asterisk developers E1 zaptel drivers are much less tested than T1).
On the other side, trusting like idiots first on Voicetronix and then on Digium Support ("Yes this card works perfectly with Asterisk, and we have many clients using them", "FXO modules are perfect to deploy a PBX with up to 12 PSTN lines") we have wasted to much money in these cards (1400 U$ in voicetronix os12 and close to $3000 in many TDM04B's) just to find none of them work's in an acceptable way (static noice, system frezes, asterisk frezes/crashes, stucked channels, hangups, and many etc)
Not a good start point to ask the boss to spend 2500 more bucks to play with some brand new E1 channel bank.

Regarding your question respect our PSTN signaling protocol, here we use Siemmens an Ericcsons pstn exchanges, and the signaling is 425 Hz tone pulses with diferent cadence for busy(500T-500P), disconnect(200T-200P-200T-600P), congestion(250T-250P), ringing(1000T-4000P), etc. I think this kind of signaling (diferent frequencies diferente cadences) is used in many/many countries in the world out there.
We also can purchase (incoming/outgoing) disconnect supervision service by polarity reversal on every PSTN line if we need it.

Best regards
Luis

Pd: what fkth is mfg?


TC wrote:

>>Em Sex 01 Out 2004 16:13, TC escreveu:
>>    
>>
>>>>T1 plus channels bank is a solution for USA but not for many other
>>>>countries because disconnect suppervision in USA is different from
>>>>allmost all the rest of the world (USA people is allways special :)
>>>>        
>>>>
>>>hmmm
>>>can you not get channel bank fxo ports that work in your part of the
>>>world ?
>>>as long the cb's signal the T1/E1 interface this should not be an issue
>>>sice the t1 or e1 signal is a universal standard.
>>>I just find it kinda hard to belive that with a technology that has been
>>>around as
>>>a channel banks that some mfg has not got it right by now ?
>>>      
>>>
>>Marcelo Pacheco
>>
>>E1 channel banks are extremely expensive.
>>    
>>
>Why do you care for e1 all you realy need are compible fxo ports
>so an t1 channel bank with fxo ports that work with your countries analog
>line would do you just fine
>where are you located & how does you provide supply supervison ?
>  
>
>>At least so far I couldn't find an E1 channel bank for 32 FXS under US$
>>    
>>
>1000
>  
>
>>anywhere in the world.
>>There are US$ 500 24 FXS T1 channel banks.
>>    
>>
>you can use these to drive any analog phones any where.
>Again why do you think you need e1 channel banks to service analog phones or
>analog
>fxo line ?
>
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