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JMONEYBL · 01-21-2003, 5:18 PM

I THOUGHT NEXTEL WAS ON IDEN NOT CDMA OR TDMA

tylerdurden · 01-21-2003, 5:34 PM

That is correct, nextel uses iDEN.

ronin · 01-21-2003, 5:54 PM

YOU DONT HAVE TO YELL.

Yes, Nextel does use iDEN, which is a TDMA based technology, I think.

northform · 01-22-2003, 2:36 PM

iDEN is not based on TDMA (IS-136). What people refer to as TDMA is actually IS-136 and what people refer to as CDMA should be called CDMAOne. iDEN is a system that seperates calls by frequency and time interval, but has nothing to do with IS-136.

ZaphodB · 01-23-2003, 10:33 AM

Quote:

Originally posted by: northform
iDEN is not based on TDMA (IS-136). What people refer to as TDMA is actually IS-136 and what people refer to as CDMA should be called CDMAOne. iDEN is a system that seperates calls by frequency and time interval, but has nothing to do with IS-136.

So it's TDMA/FDMA. It's not IS-136 (which is what most people think of when they say "TDMA") but it *IS* TDMA, at least partially.

Rich · 01-23-2003, 10:52 AM

Quote:

Originally posted by: northform
iDEN is not based on TDMA (IS-136). What people refer to as TDMA is actually IS-136 and what people refer to as CDMA should be called CDMAOne. iDEN is a system that seperates calls by frequency and time interval, but has nothing to do with IS-136.

Actually, it's a form of TDMA & GSM technology mixed, I have to find the link from Nextel & Motorola's web sites to back that up. But it's true, sorry to burst your bubble[img]i/expressions/face-icon-small-wink.gif[/img]

ronin · 01-24-2003, 4:15 PM

Quote:

Originally posted by: northform
iDEN is not based on TDMA (IS-136). What people refer to as TDMA is actually IS-136 and what people refer to as CDMA should be called CDMAOne. iDEN is a system that seperates calls by frequency and time interval, but has nothing to do with IS-136.

I never said iDEN had anything to do with IS-136, only that it is TDMA based, which it is.

Just like GSM is based on TDMA, as Rich pointed out.

northform · 01-24-2003, 4:58 PM

It's just that most people mean IS-136 when they say TDMA. Heck, even manufacturers refer to IS-136 as TDMA.

iDEN is a proprietary motorola technology. It does not use GSM or TDMA technology (defined as intelectual property not as broad sweaping concepts). If it did use the GSM or TDMA codecs or other technology, moto would have to pay for it (licence it) which they don't.

roamer1 · 01-24-2003, 8:01 PM

iDEN takes some design cues from both GSM (SIMs, call forwarding options, etc.) and IS-136 (3:1 timeslots for "cellular" calls). In other ways it's very, very different from nearly anything else out there (a variation of QAM modulation for the RF link, the VSELP vocoder, the ability to put 6:1 dispatch and 3:1 interconnect/"cellular" on the same channel, etc.)

-SC

MichaelV · 01-24-2003, 8:16 PM

I think were most people get the idea that nextel or iDEN uses TDMA is from their website. Here is part of it
Key Technologies

TDMA (Time Division Multiple Access):
iDEN's digital technology divides a channel into different "slots". Each slot can carry one voice or data transmission. By deploying an iDEN system, service providers can increase capacity by as much as six times their current analog Specialized Mobile Radio (SMR) network.

MichaelV · 01-24-2003, 8:30 PM

Sorry about the last post here is the rest of that from iDEN webpage:
Key Technologies

TDMA (Time Division Multiple Access):
iDEN's digital technology divides a channel into different "slots". Each slot can carry one voice or data transmission. By deploying an iDEN system, service providers can increase capacity by as much as six times their current analog Specialized Mobile Radio (SMR) network.
This capacity increase is accomplished using a state-of-the-art technology called TDMA. TDMA utilizes Global Positioning Satellites (GPS) to reference a synchronized time, and then divides the channel into time slots. As a result, channel capacity is increased because one channel has now been converted to multiple voice or data transmission vehicles. TDMA is a proven technology in cellular systems across Europe, the US, and in Japan. iDEN utilizes TDMA for Maximum Spectrum Efficiency.

northform · 01-25-2003, 6:52 AM

Well, technically they are right and everyone else is wrong that calls IS-136 TDMA. Eventually, though, you have to realise what people think and try not to confuse them.

bobolito · 01-26-2003, 10:45 PM

IDEN has 6 times slots within a 25khz channel?...correct me if I am wrong, but I think that's what it is. I don't intend to confuse anyone, but I prefer to explain it this way: TDMA based technologies include:

- IS-136 (what people call TDMA)
- GSM
- IDEN

For some reason, IS-136 gained the name "TDMA", but the fact is IS-136 is just one type of TDMA technology.

01-21-2003, 5:18 PM	#1
JMONEYBL Shoulda joined long ago! Join Date: Jan 2003 Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts	IDEN I THOUGHT NEXTEL WAS ON IDEN NOT CDMA OR TDMA

01-21-2003, 5:34 PM	#2
tylerdurden Join Date: Sep 2002 Posts: 316 Thanks: 0 Thanked 0 Times in 0 Posts	IDEN That is correct, nextel uses iDEN.

01-21-2003, 5:54 PM	#3
ronin Junior Member Join Date: Jul 2002 Posts: 167 Thanks: 0 Thanked 0 Times in 0 Posts	IDEN YOU DONT HAVE TO YELL. Yes, Nextel does use iDEN, which is a TDMA based technology, I think.

01-22-2003, 2:36 PM	#4
northform Join Date: Dec 2002 Posts: 891 Thanks: 0 Thanked 0 Times in 0 Posts	IDEN iDEN is not based on TDMA (IS-136). What people refer to as TDMA is actually IS-136 and what people refer to as CDMA should be called CDMAOne. iDEN is a system that seperates calls by frequency and time interval, but has nothing to do with IS-136.

01-24-2003, 4:58 PM	#8
northform Join Date: Dec 2002 Posts: 891 Thanks: 0 Thanked 0 Times in 0 Posts	IDEN It's just that most people mean IS-136 when they say TDMA. Heck, even manufacturers refer to IS-136 as TDMA. iDEN is a proprietary motorola technology. It does not use GSM or TDMA technology (defined as intelectual property not as broad sweaping concepts). If it did use the GSM or TDMA codecs or other technology, moto would have to pay for it (licence it) which they don't.

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01-24-2003, 8:01 PM	#9
roamer1 In Memoriam Join Date: Mar 2002 Location: Sandy Springs, GA Posts: 1,749 Phone(s): Palm Treo 680, Sierra AirCard 860, Moto L2 & L6, Nokia 6015i Provider(s): lots of orange, a little Little Rock blue Devices: way too many :) Thanks: 0 Thanked 0 Times in 0 Posts Images: 2	IDEN iDEN takes some design cues from both GSM (SIMs, call forwarding options, etc.) and IS-136 (3:1 timeslots for "cellular" calls). In other ways it's very, very different from nearly anything else out there (a variation of QAM modulation for the RF link, the VSELP vocoder, the ability to put 6:1 dispatch and 3:1 interconnect/"cellular" on the same channel, etc.) -SC __________________ "Never put off until tomorrow what you can do today. There might be a law against it by that time." -/usr/games/fortune sticking it out at you...

01-24-2003, 8:16 PM	#10
MichaelV Junior Member Join Date: Jan 2003 Posts: 61 Thanks: 0 Thanked 0 Times in 0 Posts	IDEN I think were most people get the idea that nextel or iDEN uses TDMA is from their website. Here is part of it Key Technologies TDMA (Time Division Multiple Access): iDEN's digital technology divides a channel into different "slots". Each slot can carry one voice or data transmission. By deploying an iDEN system, service providers can increase capacity by as much as six times their current analog Specialized Mobile Radio (SMR) network.

01-24-2003, 8:30 PM	#11
MichaelV Junior Member Join Date: Jan 2003 Posts: 61 Thanks: 0 Thanked 0 Times in 0 Posts	IDEN Sorry about the last post here is the rest of that from iDEN webpage: Key Technologies TDMA (Time Division Multiple Access): iDEN's digital technology divides a channel into different "slots". Each slot can carry one voice or data transmission. By deploying an iDEN system, service providers can increase capacity by as much as six times their current analog Specialized Mobile Radio (SMR) network. This capacity increase is accomplished using a state-of-the-art technology called TDMA. TDMA utilizes Global Positioning Satellites (GPS) to reference a synchronized time, and then divides the channel into time slots. As a result, channel capacity is increased because one channel has now been converted to multiple voice or data transmission vehicles. TDMA is a proven technology in cellular systems across Europe, the US, and in Japan. iDEN utilizes TDMA for Maximum Spectrum Efficiency.

01-25-2003, 6:52 AM	#12
northform Join Date: Dec 2002 Posts: 891 Thanks: 0 Thanked 0 Times in 0 Posts	IDEN Well, technically they are right and everyone else is wrong that calls IS-136 TDMA. Eventually, though, you have to realise what people think and try not to confuse them.

01-26-2003, 10:45 PM	#13
bobolito iPhone 3G 16GB (White) Join Date: May 2002 Location: in front of my computer Posts: 12,574 Phone(s): iPhone 3G, Sierra 875 3G Aircard Provider(s): AT&T Mobility Devices: WiFi cards/Access points Thanks: 3 Thanked 17 Times in 14 Posts Images: 50 My Auctions	IDEN IDEN has 6 times slots within a 25khz channel?...correct me if I am wrong, but I think that's what it is. I don't intend to confuse anyone, but I prefer to explain it this way: TDMA based technologies include: - IS-136 (what people call TDMA) - GSM - IDEN For some reason, IS-136 gained the name "TDMA", but the fact is IS-136 is just one type of TDMA technology. __________________

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