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Digital systems... silly questions.

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VK5ZEA

Member
Joined
Dec 11, 2011
Messages
61
Location
PORT LINCOLN South Australia
Hi Everybody,

I'm trying to get my head around some of the digital systems used in the professional comms sector. I'm going to ask some stupid questions.

P25 is quite easy to understand, Phase 1 and 2...I've had direct exposure to P25 and inter-manufacturer operability with conventional encrypted comms.


DMR (Digital Mobile Radio) - I believe Mototrbo is a DMR "variant". Are all DMR based radios compatible with each other? Can a Mototrbo radio talk to a Hytera? Can a Hytera radio use a Mototrbo repeater?
DMR Association | World Leading Professional Digital Mobile Radio

NXDN... of which Icom and Kenwood have radios... IDAS and Nexedge respectively. Are these two "variations" of NXDN compatible with each other?
NXDN(TM)-Forum SITE

dPMR - Icom are now promoting dPMR IDAS radios with a new FR5100/FR6100 repeaters too? Are they abandoning their NXDN IDAS customer base? A NXDN IDAS radio is not compatible with a dPMR IDAS radio...
Welcome to the dPMR Association, Narrowband 6.25Khz FDMA Digital Private Mobile Radio

Why do manufacturers of digital radios seems to "modify" a protocol/system and give them their own names? Shouldn't a DMR radio be a DMR radio? Is each manufacturers implementation of the standard different enough to stop interoperability between brands?

I find it confusing that NXDN has been "rebranded" by Icom and Kenwood... I know it's a sales thing... but why not promote compatibility?

*EDIT* I found this web page from 2010. It seems that NXDN and dPMR are joining forces... I presume this will eventually obsolete existing Icom and Kenwood NXDN radios.
http://www.icom.co.jp/world/news/100215_2/


Regards,

Michael.
VK5ZEA
 
Last edited:

jim202

Member
Joined
Mar 7, 2002
Messages
2,558
Location
New Orleans region
The simple answer to part of your questions is that radio companies put their own twist on the various formats to create just enough difference to make it so that the competitors radios using the same generic format have incompatibility issues. This is the way they try to limit the penetration onto their networks by other vendors. Then they try to get the using agencies to include these differences to lock out any bids from other companies for equipment to be used on the network.




Hi Everybody,

I'm trying to get my head around some of the digital systems used in the professional comms sector. I'm going to ask some stupid questions.

P25 is quite easy to understand, Phase 1 and 2...I've had direct exposure to P25 and inter-manufacturer operability with conventional encrypted comms.


DMR (Digital Mobile Radio) - I believe Mototrbo is a DMR "variant". Are all DMR based radios compatible with each other? Can a Mototrbo radio talk to a Hytera? Can a Hytera radio use a Mototrbo repeater?
DMR Association | World Leading Professional Digital Mobile Radio

NXDN... of which Icom and Kenwood have radios... IDAS and Nexedge respectively. Are these two "variations" of NXDN compatible with each other?
NXDN(TM)-Forum SITE

dPMR - Icom are now promoting dPMR IDAS radios with a new FR5100/FR6100 repeaters too? Are they abandoning their NXDN IDAS customer base? A NXDN IDAS radio is not compatible with a dPMR IDAS radio...
Welcome to the dPMR Association, Narrowband 6.25Khz FDMA Digital Private Mobile Radio

Why do manufacturers of digital radios seems to "modify" a protocol/system and give them their own names? Shouldn't a DMR radio be a DMR radio? Is each manufacturers implementation of the standard different enough to stop interoperability between brands?

I find it confusing that NXDN has been "rebranded" by Icom and Kenwood... I know it's a sales thing... but why not promote compatibility?

*EDIT* I found this web page from 2010. It seems that NXDN and dPMR are joining forces... I presume this will eventually obsolete existing Icom and Kenwood NXDN radios.
NXDN™ Forum and dPMR MoU Collaboration | Icom Inc


Regards,

Michael.
VK5ZEA
 

JRayfield

Member
Joined
Jul 31, 2009
Messages
791
Location
Springfield, MO
The CAI (Common Air Interface - the 'Over the Air protocol') is DMR - Digital Mobile Radio, which is a standard. Any radio that meets the DMR Tier 2 Standard, can talk to another DMR Tier 2 Standard radio. Yes, MOTOTRBO and Hytera products can communicate with each other, as long as they aren't using encryption. The encryption used by Motorola and Hytera are not the same. Also, the Hytera repeaters can not connect to a Motorola repeater over an IP connection. The 'protocols' used for this are different between the two brands. The DMR Tier 2 Standard does not include anything pertaining to connecting repeaters together via IP.

John Rayfield, Jr. CETma
W0PM

Hi Everybody,

I'm trying to get my head around some of the digital systems used in the professional comms sector. I'm going to ask some stupid questions.

P25 is quite easy to understand, Phase 1 and 2...I've had direct exposure to P25 and inter-manufacturer operability with conventional encrypted comms.


DMR (Digital Mobile Radio) - I believe Mototrbo is a DMR "variant". Are all DMR based radios compatible with each other? Can a Mototrbo radio talk to a Hytera? Can a Hytera radio use a Mototrbo repeater?
DMR Association | World Leading Professional Digital Mobile Radio

NXDN... of which Icom and Kenwood have radios... IDAS and Nexedge respectively. Are these two "variations" of NXDN compatible with each other?
NXDN(TM)-Forum SITE

dPMR - Icom are now promoting dPMR IDAS radios with a new FR5100/FR6100 repeaters too? Are they abandoning their NXDN IDAS customer base? A NXDN IDAS radio is not compatible with a dPMR IDAS radio...
Welcome to the dPMR Association, Narrowband 6.25Khz FDMA Digital Private Mobile Radio

Why do manufacturers of digital radios seems to "modify" a protocol/system and give them their own names? Shouldn't a DMR radio be a DMR radio? Is each manufacturers implementation of the standard different enough to stop interoperability between brands?

I find it confusing that NXDN has been "rebranded" by Icom and Kenwood... I know it's a sales thing... but why not promote compatibility?

*EDIT* I found this web page from 2010. It seems that NXDN and dPMR are joining forces... I presume this will eventually obsolete existing Icom and Kenwood NXDN radios.
NXDN™ Forum and dPMR MoU Collaboration | Icom Inc


Regards,

Michael.
VK5ZEA
 
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