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System Administration and Maintenance - Here is where radio system managers can discuss some of the more intricate details of managing their complex radio systems.

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Old 12-15-2016, 6:53 AM
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Default Question about ISSI gateways on P25

Hi sysadmins,

Please school me on what is probably a really basic question:

If two systems are linked via an ISSI gateway, will it show up on CC decoders in the "peers" or neighbors info, as in site xyz on system 1 is a peer of site abc on system 2?
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Old 12-15-2016, 7:04 AM
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From what I believe I've seen using Pro96Com, yes - the connected system shows up as a neighbor site.
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Old 12-15-2016, 5:29 PM
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Yes.

In Moto stuff, it's configured as a "Foreign System". The foreign system gets included in the matrix of neighbor sites, and the sites of the foreign system will be listed as neighbors to sites on the home system exactly as you describe. As example, system BEE00-A2E Zone 1 Site 2 might report the following neighbor list over the air:
BEE00-A2E - 1 - 1
BEE00-8E2 - 1 - 1
BEE00-A2E - 1 - 3
BEE00-A2E - 3 - 5
91FE2-003 - 1 - 2


Not really that basic a subject, though that particular answer is straightforward. ISSI is clunky and complicated, and Motorola makes it doubly so when it comes to configuration and use.
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Last edited by dpcain; 12-15-2016 at 5:39 PM..
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Old 12-15-2016, 8:43 PM
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Thanks folks. Haven't seen anything yet on a system I know is getting some ISSI testing going on, but maybe I'm not looking on the right sites.
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Old 12-16-2016, 1:58 PM
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The Kansas City MARRS system is connected with Missouri's Moswin system via ISSI.

The interconnected sites are broadcasting packets that are (so far) unknown to Pro96Com.

To me, Opcode 33 appears to be the Frequency Identifier table for the adjacent system:

Code:
"03/08 17:08:29","37","37 FD 00 01 BE E0 81 33 02 B0 0A 66 ","Multi-Block Unknown 0 - OpCode: 33 (IDEN_UP_TDMA) Mfg: 00 (Standard)"
"03/08 17:08:29","0A","0A 25 10 A2 70 80 32 00 B8 CD 35 1B ","Multi-Block Unknown 1 - OpCode: 33 (IDEN_UP_TDMA) Mfg: 00 (Standard)"
Opcode 3E appears to be information about the adjacent System/Site

Code:
"03/08 17:08:34","37","37 FD 00 00 12 B0 81 3E 04 01 12 F3 ","Multi-Block Unknown 0 - OpCode: 3E (Unknown Code 0x3e) Mfg: 00 (Standard)"
"03/08 17:08:34","00","00 33 FF FF 70 BE E0 00 ED 3E AA 94 ","Multi-Block Unknown 1 - OpCode: 3E (Unknown Code 0x3e) Mfg: 00 (Standard)"
I don't have official documentation detailing these opcodes....only guesswork.
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Old 12-24-2016, 2:25 PM
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Quote:
Originally Posted by Jay911 View Post
Thanks folks. Haven't seen anything yet on a system I know is getting some ISSI testing going on, but maybe I'm not looking on the right sites.
We are testing (and utilizing) ISSI automatic roaming on our system. Select talk groups have to be provisioned in the foreign systems to allow roaming. On our subscribers, one has to then specify the "home" (destination) of each and every TG as far as what system/WACN.

It works VERY well. The subscriber may not even be aware he/she is on a foreign system with automatic ISSI, unless they look at their display for the roaming indicator and incoming caller ID (which will show the origin of an individual ID predicated by the foreign system/WACN).
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