Also be wary of the loop you get.
Depending on the Telco you are dealing with, and the type of loop you get, "Alarm circuit, etc." they may , and have the right to, put in a low pass circuit to limit bandwidth to 15 Hz. That keeps people from using cheap alarm circuits for voice. It is not likely they will go to the trouble. But, they can do it. Cary Fitch _____ From: asterisk-users-boun...@lists.digium.com [mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of John Novack Sent: Tuesday, May 26, 2009 9:26 AM To: bald...@rogg.is; Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [asterisk-users] Maximum cable length for analog phone from FXS port That is a pretty long run. The type of analog phone can be an issue. How LITTLE loop current will it operate on? Most need more than 20 Ma to signal properly, and the voltage output of the ATA needs to be known Type of signaling? DTMF? pulse? Interconnection cable wire size and capacitance will affect high frequency response, loop current, inductive pickup and pulse shaping to name just a few. The ATA requirements need to be known. A total loop resistance of 500 ohms should work, but go out to 1200 and most will fail Do you really have control over this or will you be renting a pair from the local telco? Protection should be applied on both ends for safety of the user(s) and devices. There MUST be a better way??? asterisk-us...@rogg.is wrote: Hello. I am looking for details of the maximum allowed/usable/effective wire/cable length of the connection from a FXS port of Digium analog cards to the analog telephone handset. To clarify my intention, I need to have an analog telephone connection to my asterisk box that is 3000 meters (3km) away at least. If you have any details of ATA boxes or other similar devices that I could use to do this, I'd appreciate your input. It must be able to use a regular analog telephone handset on the far end. I've searched high and low and either I'm not clever enough in using the right terms for this or it is rarely documented? Any details much appreciated. Thank you! Baldvin _____ _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- Dog is my co-pilot
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