phones offer a service called
that allows yous to push button a single push and connect with some other Nextel user. This service is typically free as long as the other user is in the local coverage surface area. You tin even specify a grouping of Nextel users (upwards to 100) that you can connect to all at once, similar to a
like police force or taxi companies utilise. This makes Nextel a very popular provider for companies with a workforce that tin be spread out, such as construction piece of work.
Nextel is unique among service providers because it has an entirely separate special cellular network that has its ain frequencies and equipment in improver to the normal cell network shared with other providers. This network is based on Motorola’due south
Integrated Digital Enhanced Network (iDEN)
and makes Straight Connect possible. Information technology uses the 800 MHz portion of the radio spectrum assigned to
specialized mobile radio (SMR)
service. Nextel has purchased a big segment of these frequencies in a significant number of the national and international cellular service markets.
iDEN uses TDMA engineering science to split a 25 KHz frequency into six separate fourth dimension slots. Using a combination of half-duplex and full-duplex signals, iDEN is able to provide:
- Normal cell phone voice communications
- Messaging (pager, email)
Digital 2-mode radio (one-to-ane and grouping) – This is the
- Data services (Wireless Spider web and individual networks)
The digital two-way radio service uses a half-duplex signal. A normal cell telephone call uses 2 split up frequencies, one to send and one to receive, for each call while a Direct Connect call uses only a unmarried frequency. Direct Connect relies on the proven technology of
Push To Talk (PTT), normally used in dispatch radio systems. PTT requires the person speaking to press a push button while talking and so release it when they are done. The listener so presses their button to respond. This way the organization knows which direction the bespeak should be traveling in. To enable Direct Connect, Nextel configures your phone to utilise the dispatch call service to achieve the person or persons y’all specify. This person (or group) must apply Nextel’s service likewise. When you make a Straight Connect call to someone, here’southward what happens:
- You lot hitting the Direct Connect push, which is configured with the number(southward) of the person (or group) yous are calling.
- Your phone establishes a session with the Nextel iDEN-based network.
The network determines that this is a dispatch phone call (Direct Connect) instead of an
call (a normal cell telephone telephone call).
The network then determines if it is a one-to-i or a group telephone call. If information technology is a group telephone call, the network
the digital voice packets for each telephone in the group.
- The network routes the packets to the phone (or phones) of the person (or group) you are calling.
- Their phone alerts them that they accept a Straight Connect call.
- They answer the call past pressing the Talk button. Whoever is pushing the push button, whether a i-to-1 or grouping call, is the speaker.
- The call is completed and everyone disconnects.
As you can see, the Directly Connect feature still relies on cellular technology to connect to the recipient(south). A normal “walkie talkie” style ii-fashion radio volition just operate if the radios are within a certain distance of each other. Systems using the Direct Connect feature can communicate anywhere within the service area specified by Nextel, typically a large urban area or fifty-fifty an entire state.
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