| 摘要 |
<p>A single electronic computerised gateway box, SR GW1, with bespoke interfaces allows interconnectivity between a TETRA or P25 narrowband radio technology switch and standard TCP/IP versions 4 and 6 (IPv4/1Pv6) command and control or control room dispatcher systems. It allows infinite or large number of radio to smart mobile phone talkgroups (between 1-1000) known as PTT "push to talks depending upon the bandwidth of the radio manufacturers interface. The gateway connects to the MotorolaRTM TETRA family of products (specifically to AmbassadorRTM and DimetraRTM switches) via the AEB (Ambassador Electronics Bank) or CEB (Central Electronics Bank) interface. The gateway collects relevant voice calls and packages them into TCP/IP Voice over IP calls using SIP (Session Initiation Protocol). The connectivity can be through an RS232 asynchronous or full synchronous connection or El carrier interface into the CEB and then connecting via RJ45 UTP or Fibre LC connection into any other 3 party dispatcher service product, thereby allowing an infinite number of talk groups as opposed to the conventional 4 wire system which has a limitation of around 150 talkgroups per device.</p> |
