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Why isn't Nextel / iDen used in public safety?

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Jay911

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Some of the things that come to mind about iDEN systems that aren't favorable for emergency services work (IMO) are:

1. Unless you establish separate, isolated networks for exclusive use by emergency services, you are going to be competing for airtime with everyone else using the system. Then the medic calls for police backup when the patient's condition-causer comes back and shoots up the neighborhood more.. only the medic can't get through because some bunch of idiots are jamming the bandwidth, compiling a song on their iDEN phones going "Where you at?!" non stop.

2. Ruggedness/design. I'm aware there are some non-phone-shaped larger devices; the local transit department uses the mobile radio version, and we have a mobile/base unit in our services' basement (looks startlingly like an MCS2K with a handset attachment, hmm!). Nothing I've seen yet even comes close to either a) taking the kind of punishment they'd see in fire/EMS use, or 2) fitting the appropriate design required for quick use in emergency services. If I'm wrong and someone has taken, say, an XTS chassis and thrown an iDEN format radio into it, then I admit I'm wrong. But until you make a radio look and function like a radio, you're going to have firefighters and medics and others who will resist it/be confused by it/etc.

3. Why change? My department is using an 800mhz P16/P25 (however you wish to call it nowadays) 3600bps trunked radio system, and far, FAR from its full potential. Why screw with something that works? Ideally, I'd like to get all the departments in the area on that same abovementioned system, but right now, we have a handful of departments on conventional UHF, some on conventional VHF, one on an MPT1327 radio kludged into the Motorola Centracom setup, another two on a VHF-to-satellite (!) conversion, and yet another coming in on VHF connected to the trunk system via a SmartBridge between two mobiles - one VHF, one 800. My point is, adding iDEN to this is just another system that has to be kludged in. There are already a number who can't talk to one another due to the wacky setups in place (ever tried to patch a talkgroup to either an MPT1327 resource or a satellite radio channel?) - replacing it with iDEN (or adding it, in a 'less worse case') will just mess things up. Like someone on here says in their .sig, "Analog already is interoperable."

Last year after some of our district chiefs' cellphones met untimely ends due to their 'duty cycles' (read: they were beat to crap day in and day out), they demanded more 'rugged' phones and were given MiKE phones (Canada's version of NEXTEL/iDEN) to try out. The phones were returned and removed from service at the end of the trial period and we simply bought new conventional PCS phones - they just aren't suited for emergency operations.
 
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DaveNF2G

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And the number one reason iDEN is not used in public safety:

1) MONEY!!!

The Feds won't fund acquisition or upgrades to proprietary systems. iDEN is very proprietary, which makes it more expensive anyway (no competition). The only existing iDEN systems are commercial, and someone else above has already described why that doesn't work for public safety.

There is no way that Nextel could derive anywhere near the profits they realize from their commercial network if they agreed to build and maintain a private iDEN network for any size local region that excluded commercial use of excess capacity. In fact, they might not be able to profit at all. Nor is Nextel likely to license anyone else to build such a system.

Before anyone comments that the solution is a NATIONWIDE single network - puh-LEEZE. Nobody has yet been able to cover a single STATE reliably, although Motorola has apparently gotten very close in Florida (after M/A-Com dropped the ball). But "very close" is not the ultimate goal in public safety, either.
 

DaveH

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iDEN *is* used for law-enforcement on the north side of the border...Durham Regional Police (Ontario). I don't know if it's a private network or part of the public network; asked the question several times but never got a clear answer.

Dave
 
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N_Jay

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DaveH said:
iDEN *is* used for law-enforcement on the north side of the border...Durham Regional Police (Ontario). I don't know if it's a private network or part of the public network; asked the question several times but never got a clear answer.

Dave

It is used by locals a few places, but in general it is NOT a good idea!
 

Mozilla

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Nextel

Picture this : take 3-5 vheicles and using your Nextels attempt to follow as subject without being spotted... do this in a major metropolitan or at least decent sized city and try it at rush or peak traffic hours ( read into this peak nextel traffice time also)
See how long it takes you to begin loosing some of your vehicles. More importantly realize that for more than two units you have to go to group call / talk and the money meter is running, for all 3-5 units and further more as you begin to hit busy and no signals
you will realize how unreliable it is versus a good radio system.
During the hurricanes one of the local county departments ( not public safety ) which
had turned down a chance to go on the county radio system was using Nextel.
They stopped talking the nite of the storm and did not have any semblance of reliable coverage for 3 days.They ending up coming to borrow radios so they could go out after the storm and work.
At best its good for some administrative functions and support, but should not be used for any serious activity. Multiple points above this have pointed this out.....
 
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DaveNF2G

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And just try to sneak up on a suspect or surveillance target while talking on a Nextel. BEE-BEE-BEEP-SCRATCH!!! There goes your cover.
 

W4KRR

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DaveNF2G said:
And just try to sneak up on a suspect or surveillance target while talking on a Nextel. BEE-BEE-BEEP-SCRATCH!!! There goes your cover.

Even when they're working correctly (50% of the time?) they sound like crap.

I constantly get cut off while using the Direct Connect. Often when I hit the PTT to reply, I get that long "boink" sound, and the "User not available CO" message. Not available? I'm in the middle of a conversation with them! The only thing I can figure is that the systems gets full before I have a chance to hit the PTT again.
 

Al42

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DaveNF2G said:
And just try to sneak up on a suspect or surveillance target while talking on a Nextel. BEE-BEE-BEEP-SCRATCH!!! There goes your cover.
Why use the speaker? Nextels are perfectly capable of being used without them.

I see this topic as "why doesn't LE use Nextel or iDen?" (you can't use Nextel without using iDen, so why else was iDen mentioned?) I can't see any reason to not use iDen - as long as it's on a system owned by the city/county/department, etc.
 
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wwhitby

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The City of Birmingham, Alabama used to be a user on the SouthernLinc iDEN system. There were quite a few complaints from the police officers about equipment durability, poor coverage and lack of reception. Those complaints made the newspapers and had the police union up in arms. Eventually, they junked the SouthernLinc system and set up their own 3600 Motorola digital system.

The Montgomery County (Alabama) Sheriff's Department lost the use of their SouthernLinc radios when the system went down one day last december for several hours. Fortunately, they primarily use an EDACS system that did not go down.

I've actually used the SouthernLinc system while employed as a contractor at the Alabama Department of Transportation. I wasn't impressed with the coverage. Trying to talk to someone using "direct connect" or by the phone portion was very difficult when they were inside buildings. The reception was poor and the signal distorted. The company my father works for tried them out as well, and didn't care for them.

Based on my experiences and those of others, iDEN systems aren't something that I would want to trust with my life or the lives of others.

Warren
 

N4DES

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Al42 said:
I can't see any reason to not use iDen - as long as it's on a system owned by the city/county/department, etc.

Simply iDEN doesn't have the back-up failure modes that the typicial public safety radio system has. Once it looses it's connectivity to the outside word the site goes off line.
With Motorola systems, for instance, it has 3 fall back modes which are Site Trunking, Site-Wide Failsoft, and Site Distributed Fail-Soft. The first 2 are automatic and the 3rd. requires manual intervention. iDEN has none of these and has a single point of failure should data connectivity go away.
 

Mozilla

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Iden & Nextel

Al42 said:
Why use the speaker? Nextels are perfectly capable of being used without them.

I see this topic as "why doesn't LE use Nextel or iDen?" (you can't use Nextel without using iDen, so why else was iDen mentioned?) I can't see any reason to not use iDen - as long as it's on a system owned by the city/county/department, etc.

Because neither the phones or the systems are designed for it... up until this year the phones could not do " simplex" that is without a system, within the last 2 years they could finally go to an isolated network if the system failed, aka. closest tower site.
Configurations for talk groups, failsoft, dynamic regrouping, emergency etc are all lacking.
The power levels between the radios, base stations, etc are all lower with Nextel... Hence many more sites... Heres another dirty word... interoperability... with limited patching capablity and no other options to even talk conventional..... who would you talk to !!!!! Maybe reading the Smartnet, Smartzone and EDACS papers or the Wikki will help and then compare it to what you know about Nextel.
IDEN by the way is VSELP based... The original Motorola adventure into digital... they have dropped it.... PS. since you don't have a compliant system... you can forget grants or funding.... Its also sole source..... Did I mention that an FRS radio will talk farther than a Nextel in simplex mode . What happens when you flip your phone open or touch a key or it rings... it also lights up, audio levels are not the same etc...
 

johnvassel

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Around these parts, Nextels are used as a form of communications _in_addition_to the regular UHF comms. Lot of BS'ing, etc.. private info, but nothing that should go over the radio.
They record all UHF comms, not the nextel comms. For this reason they are frowned upon for using the nextels for anything 'official'.
I've wanted to chuck my nextel too many times just during fluff conversations... I sure as heck wouldnt want to rely on it for critical info.

john
 

Al42

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KS4VT said:
Simply iDEN doesn't have the back-up failure modes that the typicial public safety radio system has. Once it looses it's connectivity to the outside word the site goes off line.
Nextel's implementation of it doesn't. iDen is simply a coding method, and I can't see any reason to not use it in PS systems. As I said, there are two issues here - Nextel and iDen. iDen doesn't mean "a system owned by Nextel" or "a system just like the one Nextel uses".
 
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DaveNF2G

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As a digital encoding method, Motorola seems to consider iDEN obsolete. That would mean no support or upgrades. Another excellent reason not to START using it now.
 

N4DES

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Al42 said:
Nextel's implementation of it doesn't. iDen is simply a coding method, and I can't see any reason to not use it in PS systems. As I said, there are two issues here - Nextel and iDen. iDen doesn't mean "a system owned by Nextel" or "a system just like the one Nextel uses".

I disagree, I have read the Motorola engineering documents for iDEN and there are no fall back modes of operation. The network will not do single site trunking nor will it continue work if it looses connectivity with the iDEN trunking controller. I have never mentioned NEXTEL in my posts as there are other iDEN providers out there. I don't know where your going with this.....

There are also other issues such as the iDEN subscriber only has a .6 watt maximum output which is far cry from a 3 watt PS radio. Frequency re-use would be an issue as well as the typical county/city isn't big enough to re-use frequencies as you will quickly find out that most, if not all agencies don't have enough frequencies in a pool to just use them once in a geographic location.

Too many negatives to make it a vialble option.
 

N4DES

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DaveNF2G said:
As a digital encoding method, Motorola seems to consider iDEN obsolete. That would mean no support or upgrades. Another excellent reason not to START using it now.

True and most agencies don't have contiguous frequencies to deploy WiDEN which is current technology for Motorola.
 
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N_Jay

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KS4VT said:
True and most agencies don't have contiguous frequencies to deploy WiDEN which is current technology for Motorola.

WiDEN is GPRS concepts on iDEN Channels. It does not require continous spectrum (except maybe to avoid interferring, but reular iDEN does that just fine.
 
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N_Jay

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KS4VT said:
I disagree, I have read the Motorola engineering documents for iDEN and there are no fall back modes of operation. The network will not do single site trunking nor will it continue work if it looses connectivity with the iDEN trunking controller. I have never mentioned NEXTEL in my posts as there are other iDEN providers out there. I don't know where your going with this.....

There are also other issues such as the iDEN subscriber only has a .6 watt maximum output which is far cry from a 3 watt PS radio. Frequency re-use would be an issue as well as the typical county/city isn't big enough to re-use frequencies as you will quickly find out that most, if not all agencies don't have enough frequencies in a pool to just use them once in a geographic location.

Too many negatives to make it a vialble option.

iDEN does have some fall back modes that can be designed into a system.

It is not a standard feature like it is in commercial and public safety systems.
 
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