![]() ![]() Dispatch applications can track multiple user locations and travel routes with job site time stamps to manage and dispatch remote workers. Group calls can be made to pre-programmed groups, or dynamic call groups can be easily created by selecting users from a list or grouping within an area on the dispatch map. Dispatch applications provide a comprehensive fleet dispatching and group calling visual interface for instant nationwide voice and video calling and GPS location tracking. PoC systems include web-based dispatching applications that can be run on a web browser. PoC systems can be deployed very quickly over existing cellular and W-Fi networks, and they can work out-of-the-box with SIM cards pre-installed. PoC also eliminates the need for expensive FCC radio frequency licenses, which may not even be available in some high-density urban areas. There is no need to purchase, operate, and maintain equipment such as repeaters and multiple antenna systems. PoC requires no FCC frequency licenses or traditional radio infrastructure. Call groups can be set up based on emergency call groups, employee job functions (educator, maintenance, administration, security) people can belong to multiple groups if they are a manager or team lead. PoC provides the same group calling capabilities as traditional two-way radio systems, enabling instant group calls to multiple users with the press of a button on a handheld or mobile PoC radio or from a dispatching application. An app on the PoC device provides simple and convenient access to PoC services. The result is access to existing and reliable networks that require no maintenance or operational infrastructure expenses. This alphabet soup of terminology may be confusing, but simply put, PoC devices access the internet through 4G/LTE cellular and Wi-Fi networks for wide-area radio communications. PoC radios are also known as Internet of Things (IoT) devices that access the internet for data communications via Wi-Fi networks like any other mobile device. ![]() A data plan SIM card-like those used in cell phones-is installed in the PoC device to enable access to the internet using the 4G/LTE cellular infrastructure of mobile network operators like AT&T, T-Mobile, and Verizon. Similar to Voice over IP (VoIP), RoIP devices are portable two-way radios that access cloud-based PoC services via the internet for unlimited voice and video calling. PoC is also referred to as Radio over IP (RoIP). Radio users are untethered by the range of repeaters and base stations required for traditional radio networks. The speaker and receiver also have a better chance of understanding if there has been a technological malfunction, rather than just lag time.Push-to-Talk Over Cellular (PoC) provides group and individual communication services over both Wi-Fi, 4G and Long Term Evolution (LTE) technology, creating a nationwide radio network. ![]() The hand switch means both the speaker and listener know immediately when to talk or listen, depending on the interlocutor’s communication and when the conversation is interrupted. While this means an automatic silence for the last few seconds of a transmission, it also means that speakers must wait for it to expire before they can speak or receive conversation again.Ī PTT radio gives the user control of when to speak and when to listen. In addition, the VOX employs a hang timer, which can last between 1 and 3 seconds, so it remains engaged during pauses in speech. Though most VOX circuits have a sensitivity adjustment, the effectiveness varies with different models. This can lead to conversations that are hard to maintain and unnecessary time spent clarifying messages. The VOX can also be triggered by the loudspeaker that picks up sounds on the other side of the conversation. In a VOX radio, the switch can be triggered by any minor sound, such as heavy breathing, side conversation, or background noise beyond the speaker’s control. While this is practical, a Push-To-Talk (PTT) walkie talkie still has certain advantages. It also saves storage space and battery life on devices. Because VOX is automatic, it has the benefit of letting the speaker keep their hands free while talking. The VOX includes a delay before it switches direction to ensure that it doesn’t cut out when a speaker pauses. It gives the illusion that the transmitter turns on when someone is talking and turns off when they stop. A radio containing a VOX switch, such as the X-Talker T71VP3 Two-Way Radio, detects a sound over a specific limit and then changes speaker direction. The alternative to PTTs is voice-operated switches, also known as VOX, designed to automate the switching process. The Benefits of PTT Radio Over a VOX Radio ![]()
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