SafetyNET is an integrated node computer with a rugged rack mount housing. It features front panel controls with security lock, keyboard, mouse, and flat panel monitor. It can be interfaced with any repeater, base station, mobile, or portable radio from an associated two-way radio system. A single SafetyNET device is capable of connecting up to 4 radios (our SafetyNET Quad) and can be cascaded to facilitate additional radio systems.  SafetyNET uses a radio system specific interface cable with a standard 8-pin RJ45 connector to connect to the radio system and uses an Ethernet connection to the Internet. There is no IP provisioning for the end points due to the use of dynamic IP addresses. By offering crossband repeater and RoIP functionality, the inherent limitations of legacy LMR and SMR radio can be easily overcome.

SafetyNET creates instant links anywhere on any frequency band such as UHF, VHF, HF, 700 MHz, 800 MHz, 900 MHz, and Low Band VHF. SafetyNET is not only band agnostic but also mode neutral, creating a common peering structure for SSB, AM, FM, IMBE, P25 I&II, VSELP, DLMR, iDEN, TETRA, LTR, EDACS, SmartNET, OpenSky, NXDN, SmartZone and other legacy wireless communication technologies.

SafetyNET Application Diagram

Using RoIP technology with unique TCP unicast architecture, voice traffic to and from the radio system is converted to IP data and sent over the internet or a private WAN/LAN to a server. Client software which accompanies each device controls the communication sessions and provides secure authorization to gain access to the server.  Each device creates its own secure, manageable identification to the server which is registered with the server administrator after completing the security authorization procedures. Security procedures include a valid server address, port, and password. Once connected to the server, the user can select various talk groups or chat rooms to experience one-to-one or one-to-many conversations with other connected users.

The software allows for the adjustment of both mic and output volumes at the user level. The software also contains automatic gain control (AGC) for automatic level adjustment. As other members of the soft channel participate in a conversation, their respective soft radio ID or SiteCAST/SafetyNET RF link information is highlighted to identify the party speaking and their location.

Each user connected to the same soft channel is listed in the channel presence window or talk group. A note field allows for on-the-fly silent text messaging between soft radio users, and it is typically used for a user description. One entry in the talk group may reflect either an individual on a computer, a smartphone device, or a two-way radio channel via SiteCAST/SafetyNET RF link with many radios. For example, a talk group established on the server can consist of one soft radio client ID communicating to a two-way radio system using SafetyNET with 100 radios, an individual using VBS, and 5 individuals using iWalkie. Although there would be 7 client ID’s in the talk group, the conversation is being broadcast to all 106 radio and soft radios.

All RoIP data is sent to the conference server via real-time TCP unicast over a TCP/IP socket connection. Each user connected to the server requires 9KB of server band width for encoding and decoding, 1 KB when idle. The process uses GSM 6.10EFR W/LPC error correction to maintain quality control of session conversations and toll quality speech. This provides the advantage of being able to provide 99.99% reliability and fidelity with no QoS needed. The enterprise server software, which can be either hosted by Critical RF or directly hosted by the end user on any public or private network, is included in all enterprise class solutions. The server admin program lets you delete, stun and mute users.


Unified Communications