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ISP Information:
The Java answer to LDAP. It really means "Java implementation of the Lightweight Directory Access Protocol."
ISP Glossary:
Java Directory Access Protocol - On 28 Jun 2004 02:31:27 -0700, Telecom Digest Editor noted: [TELECOM Digest Editor's Note: Am I correct that the 'walkie-talkie two way feature' was not a Walkie-Talkie in the 'traditional' sense of using a two-way radio as such (RF or radio frequency) signals but was actually a speed dial type thing for one number on the cell phone which in addition to being speed dialed was put on a handsfree type 'loudspeaker' type thing? How did that Nextel feature actually work? PAT]Here's some of the scoop:The digital two-way radio service uses a half-duplex signal. Anormal cell phone call uses two separate frequencies, one to send andone to receive, for each call while a Direct Connect call uses only asingle frequency. Direct Connect relies on the proven technology ofPush To Talk (PTT), commonly used in dispatch radio systems. PTTrequires the person speaking to press a button while talking and thenrelease it when they are done. The listener then presses their buttonto respond. This way the system knows which direction the signalshould be traveling in. To enable Direct Connect, Nextel configuresyour phone to use the dispatch call service to reach the person orpersons you specify. This person (or group) must use Nextel's servicealso. When you make a Direct Connect call to someone, here's whathappens:You hit the Direct Connect button, which is configured with thenumber(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. Ifit is a group call, the network duplicates the digital voice packetsfor each phone in the group. The network routes the packets to thephone (or phones) of the person (or group) you are calling. Theirphone alerts them that they have a Direct Connect call. They answerthe call by pressing the Talk button. Whoever is pushing the button,whether a one-to-one or group call, is the speaker. The call iscompleted and everyone disconnects.Full article:http://electronics.howstuffworks.com/question530.htmOther PTT implementations used by Verizon, AT&T Wireless and others donot use the same PTT technology and do not use SMR as Nextel does.Other non-Nextel services have a lot more latency than the Nextelimplementation. iDen had direct connect in the design of the servicefrom the outset. Other PTT schemes work differently.Here's how PTT works with Verizon Wireless:Motorola's V60p is a standard ultra-compact flip phone; the onlyvisible difference is a small black PTT button on the left side. Whenyou push the PTT button, you see the list of your PTT contacts. Usingup and down arrow keys, you highlight the individual or group you wantto call. Then you push and hold the PTT button, wait about two secondsfor a beep that confirms the connection, and start talking.At the other end, everyone in your group hears a notification beep andthen your voice. If the V60p is set in speakerphone mode --recommended for PTT communication -- you'll be heard clearly even ifthe phone is clipped to a belt or purse strap.When you finish talking and remove your finger from the PTT button,everyone else hears another beep. The next person to press his or herPTT button gets to respond. Someone else in the group hitting thebutton a second later gets a busy signal beep and has to wait.>>http://www.siliconvalley.com/mld/siliconvalley/6637702.htm[Personally, I find any kind of PTT service whether it's Nextel's orthe competition extremely annoying. It's bad enough with people whodo not know how to use a regular cell phone who insist on increasingtheir speaking volume threefold. All the squawks and beeps withdirect connect phones is at best annoying.]As to the original poster's question other articles I found whenlooking up PTT I've found that while there may have been some initialinterest in PTT services there's just not that much interest in it andit'
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