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i have never heard of Motorola Tetra?...is this an IDEN Type of trunking?
or is it something diffrent?...i have never heard of it?
or is it something diffrent?...i have never heard of it?
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Can anyone tell me what is "Motorola Tetra"?
- Thread starter Fivealpha11
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N_Jay
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Fivealpha11 said:
Tetra is the European standard for a system very similar in function to iDEN, but based around GSM and the ETSI open standard process.
Motorola TETRA, is either refering to a specific TETRA system or product using Motorola equipment, or a misnomer.
My guess it is the latter. :twisted:
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So more less for Cell phone use in other countries?
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N_Jay
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Fivealpha11 said:
No, more or less a super duper cellular styled trunked system. (like iDEN)
Think of Tetra as another 2 way digital radio standard. Its kind of like APCO25 but probably more advanced as it has encryption by default and is designed for data as well as voice. Here in the UK all Police forces are just moving onto a Tetra system called Airwave. Some of the forces (the Met in London and PSNI in Northern Ireland) are using Motorola handhelds but other forces are using Nokia or Sepura handhelds.
Regards
Ian
Regards
Ian
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N_Jay
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ianw said:
For those of us on this side of the pond, it is MUCH closer to iDEN or even OpenSky than it is to P25.
Hello
Yes I suppose it is. However Tetra also has modes where it can be run through a repeater or simplex both without a network so in that way it resembles APCO25. Sadly we don't have many APCO25 systems here in the UK so there is very little digital monitoring.
Regards
Ian
Yes I suppose it is. However Tetra also has modes where it can be run through a repeater or simplex both without a network so in that way it resembles APCO25. Sadly we don't have many APCO25 systems here in the UK so there is very little digital monitoring.
Regards
Ian
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DaveNF2G
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TETRA = TErrestrial Trunked RAdio
Raccon
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iDEN is a proprietary digital trunking system by Motorola. TETRA is a standarized (by ETSI) digital trunking system.
Motorola also offers TETRA infrastructure and terminals, called DimetraIP. AFAIK their compact TETRA system is based on hardware from Damm.
Motorola also offers TETRA infrastructure and terminals, called DimetraIP. AFAIK their compact TETRA system is based on hardware from Damm.
TETRA is not encrypted by default. Encryption is optional (and expensive I may add since it also requires Authentication, which is also optional).
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N_Jay
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Raccon said:
I find it amazing that TETRA, which post-dates GSM would leave authentication and Encryption as optional components.
What were those goofy ETSI people thinking?
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I believe at the time the first TETRA networks and terminals were being installed/delivered the manufacturers were not able to implement authentication and air-interface encryption (AIE) right away (and GSM encryption was probably not deemed suitable to fullfil the stringent requirements for PSS organizations).
Even later, when authentication was available, encryption wasn't necessarily available, too - or encryption was only available based on common, static keys (AIE Class 2).
Now the major vendors support AIE Class 3, the highest class that uses individual & dynamic keys.
That said IMO not all TETRA networks require AIE, e.g. small commercial networks or certain sectors like transportation may have no use for it, so it may acutally make sense to specify it as an option since it keeps cost down.
But those that demand AIE, like public safety and security organisations, can have it if they want.
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N_Jay
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It would have still seemed prudent to implement the existing GSM authenticationa dn encryption protocols as a baseline and develop the higher levels as needed.
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