Can someone explain how Direct Connect is Transmitted?
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This is they way I figured it works.
I hit the PTT button and talk, the data is sent to whichever cell tower that I'm close too. A sesson is created between me and the person I communicating with.
I though the data still has to travel to the tower, thought a T3 line to the central office and be routed to the cell of the person I'm talking to.
My manager is telling me that DC works from phone to phone, or from Phone to tower to phone.
but if they really do work phone to phone, then why don't they work you your underground using Direct connect with the same users in the same space.
They reason why I'm bringing this up is becasue my dept got an email saying that a DS3 (T3) line went down for 8 min in the DC area. This disrupted all services including direct connect. Now if DC works from phone to phone or from phone to tower to phone, why would a downed T3 line cause the DC service to be out?
but if they really do work phone to phone, then why don't they work you your underground using Direct connect with the same users in the same space.
They reason why I'm bringing this up is becasue my dept got an email saying that a DS3 (T3) line went down for 8 min in the DC area. This disrupted all services including direct connect. Now if DC works from phone to phone or from phone to tower to phone, why would a downed T3 line cause the DC service to be out?
Because pPTT technology is actually a VoIP service. (voice over IP) so if a T3 line that links the PDSN (Packet Data Serving Node) of your home network failed, the the latter can't assign IP addresses. Thus NO data services will work for that a particular area or odd/even number (all depending on that home network setup). Now if other data services were working then the problem might have been datafilling errors or a failure in a scheduled maintenance that just happened to coincide with that T3 problem.
but if they really do work phone to phone, then why don't they work you your underground using Direct connect with the same users in the same space.
They reason why I'm bringing this up is becasue my dept got an email saying that a DS3 (T3) line went down for 8 min in the DC area. This disrupted all services including direct connect. Now if DC works from phone to phone or from phone to tower to phone, why would a downed T3 line cause the DC service to be out?
Because PTT technology is actually a VoIP service. (voice over IP) so if a T3 line that links the PDSN (Packet Data Serving Node) of your home network failed, then the latter can't assign IP addresses. Thus NO data services will work for that a particular area or odd/even number (all depending on that home network setup). Now if other data services were working then the problem might have been datafilling errors or a failure in a scheduled maintenance that just happened to coincide with that T3 problem.
Direct Connect does not work phone to phone. It has to have a tower (or more) to work. Your phone hits the tower it is "on" which hits the other phone or uses phone lines to transfer the data to the tower the receiving phone is "on" and on to the other phone.
Direct Talk, included on some Nextel phones ONLY works phone to phone and while you have them in Direct Talk mode, Direct Connect and the phone won't work.
Direct Connect will only work underground if both phones can get to a tower.
I highly doubt that a tower is ever connected to a DS3 line. It is more than likely multiple DS1 lines or fiber whichever is easier to the location. The DS3 that went down was most likely inside a different facility.
As for DC not working, it was my understanding that limited communcation with a central system is still needed to locate all phones. After that all communication is passed onto the sub systems phone-phone, phone-tower-phone, or however that magic works.
toddz
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I highly doubt that a tower is ever connected to a DS3 line. It is more than likely multiple DS1 lines or fiber whichever is easier to the location. The DS3 that went down was most likely inside a different facility.
As for DC not working, it was my understanding that limited communcation with a central system is still needed to locate all phones. After that all communication is passed onto the sub systems phone-phone, phone-tower-phone, or however that magic works.
toddz
I been googling trying to find out how it all works. It looks like a session needs to be created between the two phones at the central office. That email we got informing us about the DS3 line got my manager worried about this happening during an emergency. I called Nextel and their tech were not even clear on how it works. This the the best think I could find.
I been googling trying to find out how it all works. It looks like a session needs to be created between the two phones at the central office. That email we got informing us about the DS3 line got my manager worried about this happening during an emergency. I called Nextel and their tech were not even clear on how it works. This the the best think I could find.
Motorola makes the iDen Technology that Nextel uses. You can try search there. The 2-way direct connect does not go thru a landline or internet. iDen towers incorporate the 2-way into the same technology as the phone service.
I live in Wash, DC. The day of 9-11 after the plane hit the Pentagon, they released all the workers in town. During this time, the cell towers were swamped and was very difficult to make an outgoing call but I had no issues making a 2-way at all to other Nextel users.
Just wanted to jump into this thread and thank everyone for the entertainment provided here.
90% of the information in this thread is completely wrong. (and some of it is just outright absurd.) I get a kick out of watching the blind lead the blind.
PTT for nextel work basically the same as a police/fire two-way system just on a larger scale and with the ability to connect to a single user instead of a broadcast system. it does not currently use landline or VOIP as stated above. it will in the near future move to a VOIP as Sprint anounced today that they will start releasing Qchat, buy qualcomm early 2008 to start replacing the IDEN network. this VOIP system has proven reliability with speeds to match IDEN with the ability to still communicate with the older IDEN and Sprint Ready-Linc systems.
Can someone explain how Direct Connect is Transmitted?
Balibe 
