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04.0 <br />Can we use our existing computer network to create an IP -based <br />dispatch system, or do we need to build a new one? <br />The answer to this question depends on the IP dispatch <br />system application. In many cases we can use existing IP <br />networks, but in other cases like public safety applications <br />you may want to think about creating a secure standalone <br />communications network Here are a few things to consider <br />with regard to IP dispatch solutions <br />- How much traftic is on my existing network and how much <br />bandwidth s available to dedicate to a commun catioms <br />solution? <br />- Does your netwctk support niulticasting Multi�asting is <br />an important element to making our dispatch .;olutions as <br />How much bandwidth will the dis <br />With a C -Soft low -bit vocoder, there can be a bandwidth <br />savings of up to 30 percent. This depends on hov, many <br />radios and dispatch positions you want or. the system. The <br />breakdown is simple e device you connect to the system <br />that operates in simpl(-x mode requires 50 k6its of available <br />effectve as possible VVe can - Mork with non- multicasting <br />networks but there are some limitations <br />- <br />• Do yot, , ant to connect and ccmmunicate between multiple <br />locations or installations via an IP dispatch network'-' If so, <br />that means you have to have a good network connection <br />between them Anywhere you have a network connection <br />could to a potential location for communications equipment <br />If you have offices across the country that are all connected <br />wta a net .ork, you could communicate between them using <br />tw. way radios because the network ties them together <br />patch system use on the network? <br />bandwidth Multiply that times the number of communication <br />lines you have on the system — a base stations means 8 x 50 <br />L Bit or 4C0 kBit for effective simultaneous communications <br />Always innke sure the network has the capacity to account for <br />the maximum possible number of simultaneous transmissions. <br />How important are SIP capabilities in a dispatch system? <br />The Session Initiation Protocol (SIP) is a signaling protocol <br />used for establishing sessions in an IP network For a radio <br />dispatc ier, SIP is one way of bringiny control of telephone <br />onto the console, be it a simple two-way call or a collaborative <br />conteience session This allows dispatch to control phone calls <br />incoming and outgoing phone calls and use features such as <br />hold unhold call for conterencing, voice mail and call <br />transfer One of the most mportant features is the ctosspatch <br />capability Df radio and phone rJoti a police officer on a radio <br />channel car be connected to a phone call to coordinate <br />activities - )r assist dispatch with a critical situation. SIP can be <br />configured to use existing switches so a large number of lines <br />are a'lailable if required. SIP is becoming an important part of <br />dispatch :onsoles Like the IP console SIP is a powerful yet <br />s!mple tool which is also eery flexible and scalable. <br />I have two dispatch locations, but can only afford to update one <br />console to /P. Will I be able to communicate with the old console? <br />In most cases Telex will be able to interface an IP -223 or <br />gateway tc each channel at the location where the radios <br />would be interfaced to the analog corsole usually the Central <br />Electronics Ban" (CEB). The IP -223 is cenfiguied in console <br />mode, and allows the channels configured this way to be <br />put on the same IP network system as the near IP console. <br />Through the network the analog console can be monitored <br />and operated like it was another IP console. The flexibility of <br />this design provides a way for an end user to start a migration <br />path to a c3mplete IP changeover when replacing the dispatch <br />consoles !r multiple locations. When required this concept <br />also provides a very cost - effective backup console to existing <br />aralog consoles. <br />4 1 www.telex.com /radiodispatch <br />