GAME CHANGERS
Two-Way Voice Over GSM A CLOSER LOOK AT TECHNOLOGY ON THE HORIZON
In the past, dealers have typically sold two-way voice as an upgraded feature that communicated over existing POTS lines, however, the emergence of two-way voice over GSM could very well push this alarm capability further into a dealer’s tool kit of services. How does it work?
The technology ‘link’
The “magic bullet” for this capability is really how two-way voice is implemented. The key is ensuring a clear, reliable con- nection between the subscriber and the central station. “Two-way audio is a difficult task because of the different technologies in play, however, the most important thing to consider is the connectivity involved,” said J.D. Benfer, owner of Response Cen- ter U.S.A., a wholesale central station. In fact, highly reputable networks are able to take the two-way voice imple- mentation of today and make it work for wireless technologies, without sacrificing dependable transport. This means that signals are still delivered over data and voice channels, but on a wireless network.
Essentiality, there are three key play- ers for reliable signal transport: wireless technology such as GSM radio, the cen- tral station and the network operating center (NOC). Through a triggered alarm at the radio, a signal is transmitted via the general packet radio service (GPRS) network to the NOC. The NOC then calls the central station receiver and delivers the alarm successfully to the central sta- tion. The NOC also generates a second alarm to the central station, which holds the line open for two-way voice. Then, the NOC acknowledges the alarm and gives the radio a number to call in to. The NOC uses caller ID to route the incoming radio call to the open central station line to create a two-way voice session — and it is all done within seconds.
Getting on board with two-way voice When evaluating two-way voice capabili- ties, dealers should look to ensure voice sessions are delivered without changes to a central station’s operations. For exam- ple, two-way voice should not disrupt
station guidelines or impair the quality of voice sessions, but provide the central station and the end user with seamless, clear two-way communications identical to the original POTS method. Product history and development affect how each technology (wireless and two-way voice) works together, so for dealers, it is imperative to consider a product’s development when researching technologies to deliver two-way voice. For example, some product versions include self-contained lines using control panels and integrated GSM radio modules for transport. Others have a radio that sup- plies the transport or the audio verifica- tion system (AVS) that actually creates the interaction of two-way voice. It is the interaction that counts to consumers. As Benfer points out, “Two- way audio is going to be such a major player in the market because consumers are savvy enough to know the benefit of a hearing a human voice in times of emergency.” — By Dean Mason, senior communications marketing manager at Honeywell Security and Communications
Finalized Certificate Lets Products Display HDcctv Logo
The HDcctv Alliance™, the global security industry consortium estab- lished to manage and publicize techni- cal standards for HDcctv equipment interoperability, announced that it rati- fied the HDcctv compliance certifica- tion program. The certification program consists of a suite of standards documents that describe the requirements, methodol- ogy, compliance test process and test specifications that HDcctv product manufacturers must follow to apply for a certificate of compliance. Obtain- ing a certificate of compliance qualifies an HDcctv product to bear the unique HDcctv logo indicating interoperabil-
98 November 2010
ity per version 1.0 of the HDcctv stan- dard. Compliant products are included in the Compliant Products List main-
od to prove compliance to this stan- dard ensures that any interconnected HDcctv-compliant products are guar- anteed to interoperate,” explained John Hudson, HDcctv Alliance Technical committee chair. Todd Rockoff, HDcctv Alliance
tained by the Alliance on its website (
www.highdefcctv.org/). Other prod- ucts are expected to be added to the Compliant Products List in the fourth quarter of 2010. “The addition of a practical meth-
executive director, added, “With the finalization of the compliance certifica- tion process and the establishment of the first of many planned independent HDcctv Compliance Test facilities, there is now a practical way for Alli- ance members to certify their products and display the HDcctv logo as a guar- antee of interoperability,” concluded Dr. Rockoff.
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