Nextel phones offer a service called Direct Connect that allows you to push a single button and connect with another Nextel user. This service is typically free as long as the other user is in the local coverage area. You can even specify a group of Nextel users (up to 100) that you can connect to all at once, similar to a dispatcher's radio like police or taxi companies use. This makes Nextel a very popular provider for companies with a workforce that can be spread out, such as construction work. Nextel is unique among service providers because it has an entirely separate special cellular network that has its own frequencies and equipment in addition to the normal cell network shared with other providers. This network is based on Motorola's Integrated Digital Enhanced Network (iDEN) and makes Direct Connect possible. It uses the 800 MHz portion of the radio spectrum assigned to specialized mobile radio (SMR) service. Nextel has purchased a large segment of these frequencies in a significant number of the national and international cellular service markets.

Digital two-way radio (one-to-one and group) - This is the dispatch call capability. The digital two-way radio service uses a half-duplex signal. A normal cell phone call uses two separate frequencies, one to send and one to receive, for each call while a Direct Connect call uses only a single frequency. Direct Connect relies on the proven technology of Push To Talk (PTT), commonly used in dispatch radio systems. PTT requires the person speaking to press a button while talking and then release it when they are done. The listener then presses their button to respond. This way the system knows which direction the signal should be traveling in. To enable Direct Connect, Nextel configures your phone to use the dispatch call service to reach the person or persons you specify. This person (or group) must use Nextel's service also. You hit the Direct Connect button, which is configured with the number(s) of the person (or group) you are calling.

Your phone establishes a session with the Nextel iDEN-based network. The network determines that this is a dispatch call (Direct Connect) instead of an interconnect call (a normal cell phone call). The network then determines if it is a one-to-one or a group call. If it is a group call, the network duplicates the digital voice packets for each phone 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 have a Direct Connect call. They answer the call by pressing the Talk button. Whoever is pushing the button, whether a one-to-one or group call, is the speaker. The call is completed and everyone disconnects. ­­As­ you can see, the Direct Connect feature still relies on cellular technology to connect to the recipient(s). A normal "walkie talkie" style two-way radio will only 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 even an entire state. See the next page for more information. 3G Newsroom: What is 3G?

Copyright © 2010 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C liability, trademark and document use rules apply. This specification defines an API for storing data in databases that can be queried using a variant of SQL. Beware. This specification is no longer in active maintenance and the Web Applications Working Group does not intend to maintain it further. This section describes the status of this document at the time of its publication. Other documents may supersede this document. This document is the 18 November 2010 Working Group Note of Web SQL Database. Publication as a Working Group Note does not imply endorsement by the W3C Membership. This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than work in progress. The W3C Web Applications Working Group is the W3C working group responsible for this document.

This document was on the W3C Recommendation track but specification work has stopped. The specification reached an impasse: all interested implementors have used the same SQL backend (Sqlite), but we need multiple independent implementations to proceed along a standardisation path. The Web Applications Working Group continues work on two other storage-related specifications: Web Storage and Indexed Database API. Implementors should be aware that this specification is not stable. Implementors who are not taking part in the discussions are likely to find the specification changing out from under them in incompatible ways. Vendors interested in implementing this specification should join the aforementioned mailing lists and take part in the discussions. All feedback is welcome. The latest stable version of the editor's draft of this specification is always available on the W3C CVS server. This specification is automatically generated from the corresponding section in the HTML5 specification's source document, as hosted in the WHATWG Subversion repository.

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