asterisk-users at rogg.is
2009-May-26 14:09 UTC
[asterisk-users] Maximum cable length for analog phone from FXS port
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 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20090526/f70dbd06/attachment.htm
John Novack
2009-May-26 14:26 UTC
[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-users at 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20090526/f6c00a9f/attachment.htm
Lyle Giese
2009-May-26 14:36 UTC
[asterisk-users] Maximum cable length for analog phone from FXS port
asterisk-users at 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 > > >It's not expressed in distance. They will supply the current & voltage output and you need to apply ohm's law. That requires knowing the resistance of the cable which is dependent on length and gauge. Lyle Giese LCR Computer Services, Inc. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20090526/f45b27b1/attachment.htm
Danny Nicholas
2009-May-26 14:40 UTC
[asterisk-users] Maximum cable length for analog phone from FXS port
The best a native cat5 can run is 100 meters. Unless you like paying your telco huge bucks, you should go for some kind of SIP connection to your box. _____ From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of asterisk-users at rogg.is Sent: Tuesday, May 26, 2009 9:09 AM To: 'Asterisk Users Mailing List - Non-Commercial Discussion' Subject: [asterisk-users] Maximum cable length for analog phone from FXS port 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20090526/a17fea8d/attachment-0001.htm
Heath Roberts
2009-May-26 16:11 UTC
[asterisk-users] Maximum cable length for analog phone from FXS port
On Tue, May 26, 2009 at 10:09 AM, <asterisk-users at rogg.is> wrote:> 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? >I've not seen a high-current ATA, but you could probably add a KIT8L from here: http://www.sandman.com/longloop.html to a regular terminal adapter to boost the loop voltage/current. -- Heath Roberts htroberts at gmail.com -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20090526/e05179f7/attachment.htm
Tzafrir Cohen
2009-May-26 16:52 UTC
[asterisk-users] Maximum cable length for analog phone from FXS port
On Tue, May 26, 2009 at 12:44:26PM -0400, Jon Pounder wrote:> Wilton Helm wrote: > > one thing I missed mentioning about fxs devices - the linksys/sipura > ones actually allow you to set line characteristics on the slic inside > it. you can vary from the 600ohm default, and tweak gains a bit. Some > mix of a capacitive line or different resistance may help. never tried > myself but there are a ton of things you can play with.Any of those are actually important? Which? -- Tzafrir Cohen icq#16849755 jabber:tzafrir.cohen at xorcom.com +972-50-7952406 mailto:tzafrir.cohen at xorcom.com http://www.xorcom.com iax:guest at local.xorcom.com/tzafrir