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'''Motorola Type II''' refers to the second generation Motorola [[trunking|trunked radio systems]] that replaced fleets and subfleets with the concept of [[talkgroups]] and individual radio IDs. There are no dependencies on fleetmaps, therefore there are no limitations to how many radio ids that can participate on a talkgroup. This allows for greater flexibility for the agency. When you scan Motorala IDs, each Type II user ID you see appears as an even 4 or 5 digit number without a dash (example 2160).
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[[Trunked Radio Systems]] → Motorola Type II
  
The term Smartnet refers to a set of features that make Motorola Type I and II trunked systems [[APCO-16]] compliant. These include better security, emergency signaling, dynamic regrouping, remote radio monitoring, and other features.  
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'''Motorola Type II''' refers to the second generation Motorola [[Trunked Radio Systems]] that replaced fleets and subfleets with the concept of [[talkgroups]] and individual radio IDs.  
  
The following is true of a Type II Smartnet system:
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Variations of the Type II Trunking system include:
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*[[Motorola Type IIi Hybrid]]
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*[[Motorola Type II Smartnet]]
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*[[Motorola Type II SmartZone]]
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*[[Motorola Type II SmartZone OmniLink]]
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*[[Motorola Type II VOC]]
  
* Up to 28 system channels
 
* Up to 65534 unique radio ids
 
* Up to 4095 talkgroups
 
* They use odd numbered talkgroups
 
  
== Status Bits ==
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=== Talkgroup and Radio ID Display ===
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Type II systems have no dependencies on fleetmaps, and therefore no limitations to how many radio ids that can participate on a talkgroup. This allows for greater flexibility for the agency.
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Motorola Type II talkgroups appear on a scanner as an even number without a hyphen, ranging from 16 to 65504 in increments of 16 or 32 (depending on whether the system uses Priority Monitor or not). Talkgroups on systems using Priority Monitor will display as 16, 48, 80, 112 and so on; on systems where Priority Monitor is not used, talkgroups display as 16, 32, 48, 64, 80 and so on.
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Individual radio IDs, on the other hand, appear as a number between 1 and 65534; while Type II systems have some gaps in usable IDs (for system technical reasons), most are capable of up to at least 65000 individual radio IDs.
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=== Emergency Flagging ===
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Motorola systems have two potential forms of flagging a talk group as being in an emergency mode (this gives a user priority on a talk group until the emergency state is cleared by the user or the dispatcher): the first method is to set a status bit in the management traffic, the second is to shift the talk group ID by +2 and patching it to the original talk group ID (+0). Uniden scanners are only capable of detecting the first method. A hack of a solution is to add the original talk group ID and the offset talk group ID (+2) to the system in the scanner and set the priority of the +2 talk group ID to be On; one can then add an alert tone and alert backlight to the offset talk group to simulate the emergency detection functionality available to systems that use the second flagging method.
  
Type II Smartnet systems uses status bits for special transmissions such as Emergency, Patches, DES/DVP scrambled transmissions, and Multiselects on Motorola Trunking systems. Motorola Trunking radios directly interpret them for their special functions, thus no difference is noticed by the person with the radio. The Trunktracker scanners however interpret these special talkgroup status bits as different [[talkgroup|talkgroups]] entirely. Below is the conversion chart for these special status bits.
 
  
{|class="toccolours" border="1" cellpadding="2" style="border-collapse: collapse;"
 
!Dec ID + #
 
!Usage
 
|-
 
|ID+0
 
|Normal Talkgroup
 
|-
 
|ID+1
 
|All Talkgroup
 
|-
 
|ID+2
 
|Emergency
 
|-
 
|ID+3
 
|Talkgroup patch to another
 
|-
 
|ID+4
 
|Emergency Patch
 
|-
 
|ID+5
 
|Emergency multi-group
 
|-
 
|ID+6
 
|Not assigned
 
|-
 
|ID+7
 
|Multi-select (initiated by dispatcher)
 
|-
 
|ID+8
 
|DES Encryption talkgroup
 
|-
 
|ID+9
 
|DES All Talkgroup
 
|-
 
|ID+10
 
|DES Emergency
 
|-
 
|ID+11
 
|DES Talkgroup patch
 
|-
 
|ID+12
 
|DES Emergency Patch
 
|-
 
|ID+13
 
|DES Emergency multi-group
 
|-
 
|ID+14
 
|Not assigned
 
|-
 
|ID+15
 
|Multi-select DES TG
 
|}<br>
 
  
Therefore, if a user was transmitting a multi-select call on [[talkgroup]] 1808, the trunktracker would actually receive those transmissions on 1815. Some common uses of these status bits are as follows:
 
  
* When a user hits their emergency button, all conversations on the [[talkgroup]] revert to the emergency status talkgroup (ID+2) until the dispatch clears the emergency status. Therefore, if someone hit their emergency button and their radio was on [[talkgroup]] 16, all communications would switch to talkgroup 18.
 
* A lot of Fire and EMS departments dispatch tone-outs and alarms as Multi-select communications (ID+7). Therefore, if your fire department dispatch [[talkgroup]] is 1616, and they do dispatch tone-outs and alarms as Multi-selects, then those communications will be on [[talkgroup]] 1623.
 
  
This can be a problem, because you will miss communications if you don't have those [[talkgroup|talkgroups]] programmed. By setting the Type II block you are monitoring with a fleetmap of S-1 (Mot Size A), you'll essentially get Type I subfleets for each Type II [[talkgroup]] - encompassing all of the status bits into one subfleet.  Some scanners also allow you to disable the status bit information so that you will alwys see the ID+0 regardless of the status of the [[talkgroup]].
 
  
SmartNet systems also added a scanning feature, called "Priority Monitor," which permitted priority scanning of talkgroups. The subscriber radio has the choice of selecting two priority talkgroups (one high and one low priority in addition to eight non-priority talkgroups). When the radio is in the middle of a voice call it is continually receiving sub-audible data on the voice channel indicating the talkgroup activity on the other channels of the system. If a talkgroup id pops up which is seen as a higher priority to the active call the radio will switch back to the control channel to look for the late entry data word indicating which channel to tune to.
 
  
This voice channel sub-audible datastream has a limitation in the number of bits it can use to represent a talkgroup id. Because of this the last digit of the talkgroup id (right-most) is removed. The radio then presumes any id it receives is an odd numbered talkgroup id. This is the reason behind odd numbering of talkgroups on SmartNet systems. If the systems adminsitrator assigned odd AND even numbered talkgroups there would be a lot of confusion with the Priority Monitor feature when reading the data over the voice channel. With the early versions of the Radio Shack PRO-92 you saw this trouble as it used only the sub-audible data to track trunked systems.
 
 
[[Category:RR Glossary]]
 
[[Category:RR Glossary]]
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[[Category:Professional Radios Glossary]]
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[[Category:Receivers Glossary]]
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[[Category:Scanners Glossary]]
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[[Category:Signal Analysis and Decoding Glossary]]
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[[Category:Trunktracking Glossary]]

Latest revision as of 23:01, 29 January 2016

Trunked Radio Systems → Motorola Type II

Motorola Type II refers to the second generation Motorola Trunked Radio Systems that replaced fleets and subfleets with the concept of talkgroups and individual radio IDs.

Variations of the Type II Trunking system include:


Talkgroup and Radio ID Display

Type II systems have no dependencies on fleetmaps, and therefore no limitations to how many radio ids that can participate on a talkgroup. This allows for greater flexibility for the agency.

Motorola Type II talkgroups appear on a scanner as an even number without a hyphen, ranging from 16 to 65504 in increments of 16 or 32 (depending on whether the system uses Priority Monitor or not). Talkgroups on systems using Priority Monitor will display as 16, 48, 80, 112 and so on; on systems where Priority Monitor is not used, talkgroups display as 16, 32, 48, 64, 80 and so on.

Individual radio IDs, on the other hand, appear as a number between 1 and 65534; while Type II systems have some gaps in usable IDs (for system technical reasons), most are capable of up to at least 65000 individual radio IDs.


Emergency Flagging

Motorola systems have two potential forms of flagging a talk group as being in an emergency mode (this gives a user priority on a talk group until the emergency state is cleared by the user or the dispatcher): the first method is to set a status bit in the management traffic, the second is to shift the talk group ID by +2 and patching it to the original talk group ID (+0). Uniden scanners are only capable of detecting the first method. A hack of a solution is to add the original talk group ID and the offset talk group ID (+2) to the system in the scanner and set the priority of the +2 talk group ID to be On; one can then add an alert tone and alert backlight to the offset talk group to simulate the emergency detection functionality available to systems that use the second flagging method.