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Bt's 21cn and your alarm monitoring


Added: 12-08-2011
Author: Steve Nutt
Category: VoIP 		← Back | ↓ Related | Home →


If you have a monitored alarm system is more than British Telecom landline then you must understand the consequences of sending a signal about the new 21CN network. 21CN BT analogue unlike the existing land, but digital and use the Internet Protocol (IP) as its main protocol. About it, he uses the Session Initiation Protocol (SIP) which is equivalent to an Internet protocol that is used by many Voice over IP providers. Standing is because that he would suffer a lot 21CN network issues such as alarm systems, suffer for years trying to send a signal through a VoIP service provider network to 3rd parties.

Unfortunately, many alarm companies hold only to find out how their customers' systems will be affected by 21CN. If the document describes the BT 21CN Trials their problems not only for their new network. Carrier Pre-Select and local t. former loop means that the more basic network of the other Telcos are used for alarm signal transmission to VoIP (Voice over Internet Protocol) - often without the knowledge of the alarm installation company or client.

History has shown that panels and digital alarm communicator modems can not be trusted to send their signals through the VoIP network. 21CN to allow companies the previous results, but will suffer more as time continues and as increasing numbers of users to the network under load. If the number of customers already have internet connection available, it makes sense to fix the problem now rather than waiting for expensive failures in communication.

One problem is that BT will not recognize the fact that there is a possibility that many of the issues in the field of monitoring the alarm, however, 21CN other documents that seem contrary to the view, which has caused confusion in the security alarm industry.

In 2007 BT told us there would be no problem with the alarm association in 21CN. In 2008 we were told that the system will be prepared out of 21CN Cardiff trial as a result of the work undertaken by the British Security Industry Association.

In April 2009 the test plan BSIA publishes BT 21CN. Test plan has been put together after nearly two years of development by the BSIA and its members with the periodic system is approximately 21 Century Network'equipment in BT's Adastral Park and Swansea. The main reasons for concern are:

Echo cancellation, but always use a high-speed fax modem or see

Audio path discontinuity would happen if the buffer length Matter changes, both during a voice call or when a modem or a fax appear.

Potential increase the round trip delay

State testing programs continue Please note: Any results obtained from testing will not prove that the CPE (customer equipment building) will be a lot of BT 21CN network.

So, with information from BT as alarm companies and their heads in the sand, you are also advised to do your own research and find companies and Alarm Monitoring Center who took the issue a bit more serious.



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