Hi, I have a potential client who has legacy alarm systems which use modems to transmit encoded data to a remote location through the PSTN. They wish to replace the 'PSTN' bit with an IP link. I am aware that it would be best if the data was transmitted directly over IP rather than modulated and then sent on the internet, but that is not possible because of the legacy equipment. I was wondering if there was some specialized ATAs of some kind that would do TDMoIP and which could be used for this purpose? Link latency is about 300ms with no more than 10ms jitter. If you have a solution please let me know! Cheers, Jean-Michel.
Hey jean, I have had to deal with the same situation many times what we have come to the conclusion is you can actully get them to work only under the 4-2 signaling that the alarm companys use. Just about all alarms now are set to use contact id which we have found out that we send the data ok but we don't get a kiss back telling the alarm to silent. Note the different between 4-2 and contact id are 4-2 basically calls and says there is a issue here. Contact id will call and say there is an issue on the 4th floor room 410 closet. Basically with contact id you get spacifics of the issue. Note set the alarm speed to as low as possible. And in some cases the alarm comapnys are ass's and wont change it to 4-2 because they have to re id everything. Oh yea and when testing make sure you call the alarm company and put it in test mode the fire dept dosnt exactly like it when the get false calls. Carlos Alcantar Race Technologies, Inc. 101 Haskins Way South San Francisco, CA 94080 P: 650.246.8900 F: 650.246.8901 E: carlos@race.com -----Original Message----- From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Jean-Michel Hiver Sent: Saturday, October 22, 2005 12:59 PM To: Asterisk Users Mailing List - Non-Commercial Discussion; Commercial and Business-Oriented Asterisk Discussion Subject: [Asterisk-Users] Modem Over IP: solutions ? Hi, I have a potential client who has legacy alarm systems which use modems to transmit encoded data to a remote location through the PSTN. They wish to replace the 'PSTN' bit with an IP link. I am aware that it would be best if the data was transmitted directly over IP rather than modulated and then sent on the internet, but that is not possible because of the legacy equipment. I was wondering if there was some specialized ATAs of some kind that would do TDMoIP and which could be used for this purpose? Link latency is about 300ms with no more than 10ms jitter. If you have a solution please let me know! Cheers, Jean-Michel. _______________________________________________ --Bandwidth and Colocation sponsored by Easynews.com -- Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
alex@pilosoft.com
2005-Oct-22 16:48 UTC
[Asterisk-Users] Re: [Asterisk-biz] Modem Over IP: solutions ?
On Sat, 22 Oct 2005, Jean-Michel Hiver wrote:> I have a potential client who has legacy alarm systems which use modems > to transmit encoded data to a remote location through the PSTN. They > wish to replace the 'PSTN' bit with an IP link. > > I am aware that it would be best if the data was transmitted directly > over IP rather than modulated and then sent on the internet, but that is > not possible because of the legacy equipment. > > I was wondering if there was some specialized ATAs of some kind that > would do TDMoIP and which could be used for this purpose? > > Link latency is about 300ms with no more than 10ms jitter. If you have a > solution please let me know!No. Terminate the connection on the remote side. Equipment such as Lucent MAX to do that is a dime a dozen now (4-port max6000 is ~200$) -alex
We use use RS232 to Ethernet converters to solve this kind of applications, for instance Moxa. Jorge Mendoza Jean-Michel Hiver wrote:> Hi, > > I have a potential client who has legacy alarm systems which use > modems to transmit encoded data to a remote location through the PSTN. > They wish to replace the 'PSTN' bit with an IP link. > > I am aware that it would be best if the data was transmitted directly > over IP rather than modulated and then sent on the internet, but that > is not possible because of the legacy equipment. > > I was wondering if there was some specialized ATAs of some kind that > would do TDMoIP and which could be used for this purpose? > > Link latency is about 300ms with no more than 10ms jitter. If you have > a solution please let me know! > > Cheers, > Jean-Michel.