Capacity Plus
Sales Training
Contents
What is Capacity Plus?
•Trunking capabilities
•Capacity Plus Capabilities
•Digital Features Supported
•Rest Slot function
•Data revert functionality
•Fault tolerance
Programming Overview
•Programming logic
•Programming a system
What is Trunking?
A trunking radio system differs from a conventional radio system in the way it
shares channels between radios
Conventional
Trunking
• A trunking system shares a pool of channels
• 1 channel to one or more groups of user
• Employs no logic in call handling
• Usually 1 call to 1 channel
(2 to 1 with MOTOTRBO digital)
for a large number of users (talkgroups)
• Automatically assigns available channel to
requesting user
• Lowers probability that calls will be blocked
because an open channel will be found
easier
• Allows fewer channels to support larger
amounts of users
Convenmtional vs. Trunking
Conventional
Trunking
Channels dedicated to talkgroups
Channels Shared by Talkgroups
Channel
Channels
Channel
Channel
• Low complexity, low cost
• More efficient use of channels
• Higher traffic density
• Simple user operation
• automatic channel selection, call queuing
What is Capacity Plus?
Increase in the capacity of MOTOTRBO
systems!
•Single Site Trunking
•Up to 12 voice channels and 24 data revert slots
•Up to 1200 users
What is Capacity Plus?
• Single site trunking configuration
• Software ONLY design : NO CONTROLLER NEEDED
• Trunk up to 12 digital voice slots
Digital
mode
only!
• Dedicate up to 24 additional digital data revert slots
• Supports 255 Talk Groups
• 65,535 programmable radio IDs
• Capacity for up to 1200 active radios PLUS larger amounts of data
• Digital Feature Only
System Configuration
12 dynamic voice/data channels
Off the Shelf
3rd-party IP
switch
24 dedicated data channels
RDAC
RDAC –Remote, Diagnotics and Control
Motorola provides a software application that allows a system
administrator the ability to monitor and control repeaters
within the system (analog or digital)
The following features are available:
Repeater Diagnostics
Repeater Control
•Read Enabled/Disabled Status
•Read Analog/Digital Status
•Read Wide or Local Area Status
•Read Transmit Power Status
•Read Available Channels
•Read Inbound RSSI
•Read IPv4 Address and UDP Port
•Change Status „Active“ or
„Disabled“
•Change Channels
•Change Power Level
•Reset Repeater
•Repeater Interrupt
Repeater Alarm
Reporting
•Detect and Report Receiver Lock
Detect Failure
•Detect and Report Transmitter
Lock Detect Failure
•Detect and Report Overheating
•Detect and Report AC Power
Supply Failure
•Detect and Report Main Fan
Failure
• Operates over an IP network or locally via USB or GPIO connection
•
RDAC can only communicate with one wide area system at a time
RDAC User Interface
Main
interface
Diagnostics
Screen
Control
screen
Configuration
screen
Typical End Users
Airports
(domestic)
Events
Hafen
Shopping
Malls
Local
Transportation
(Buses, Taxis,…)
Bank
Districts
Manufacturing
Hardware Requirements
MOTOTRBO repeaters from July Shipped with 1.5 release firmware
MOTOTRBO subscribers
Shipped or upgraded with 1.5 release firmware
IP Switch: from a 3rd Party
Note: Radios not upgraded to a firmware version 1.5 or later will not
be able to operate on a Capacity Plus System
Capacity Plus Features
• PTT ID
• Emergency (w/ TG revert)
• Call Alert
• Radio Check
• Individual Call
• Radio Inhibit
• Voice Privacy
• Talkgroup Scan
• All Call/System Wide Call
All Call
All radios listen to the All Call
(including radios listening to other calls)
Transmitting radios make late entries
After they end their current transmissions
Multi-System Support: Zones
The subscriber can support different system types on the same radio!
• Only 1 system can be active at a given time
• Multiple zones can be programmed in any subscriber
• More then one of a system type can exist on the same radio!
Zone 1: Capacity Plus System 1
Zone 2: IP Site Connect System
Zone 3: Conventional Digital System
Zone 4: Capacity Plus System 2
Note: It is also possible
to program a subscriber
to access different system
types by simply changing
knob positions!
Data Capabilities
Capacity plus supports all legacy data capabilities:
•
GPS
•
Text Messaging (Application and unit to unit)
•
Telemetry
•
RDAC Application
Data capabilities have been enhanced to support larger fleets
Rest Slot: the key to Capacity Plus
•
Acts as a “dynamic home slot”
•
Can be any slot on the system
•
•
Rest Slot will “roll” to different voice slots in the system
Frequently changes during system use
A
Slot 1
B
Rest Channel
Is only the home for inactive radios
C
Slot 2
Slot 3
IP Switch
D
F
G
Slot 4
How does it work?
A
B
C
Slot 1
Slot 5
B
C
C
Slot 2
Slot 6
A
Slot 3
IP Switch
Slot 7
A
B
TG C
Slot 4
Slot 8
Process is repeated over and over ensuring optimal performance!
How does it work? - Repeater
1.
All new calls always start on the Rest Slot
2.
When a call starts, the Rest Slot:
3.
•
Selects an idle slot to be the new Rest Slot
•
Informs all idle subscribers to move to it
•
Converts itself to a traffic slot
•
Begins repeating audio to radios
When a call ends on the Rest Slot:
•
The repeater informs the radios of the new Rest Slot
•
The radios then move to the new Rest Slot
How does it work? - Subscriber
1.
All possible Voice Slots are programmed into the subscribers
•
2.
Radio must “know” of the channel to utilise it
Upon power up:
•
Radio performs a passive search for Rest Slot
•
3.
Listens for an active rest channel
If all channels are idle:
•
A “polite” wakeup message is sent to known channels
•
Known = programmed into radio
•
Messages are sent one by one to each channel
Rest Slot Benefits
1.
Allows system to be “shared channel friendly” since it can still
operate with interference
•
Easier to satisfy the FCC frequency coordination requirements
since protected channels aren’t required
2.
No control slot required
•
No wasted channel capacity = LOWER SYSTEM COSTS!
•
The “request and grant” control mechanism is removed from the
equation, allowing for quicker system access time
Understanding Capacity Plus Preference
Levels
•
The repeaters in a Capacity Plus system use a metric or weighting system to determine which channel should be the next rest
channel and therefore the next voice channel. For example, if there are 4 repeaters in a Capacity Plus system and the fourth
repeater happens to be vulnerable to interference then you can set it’s Preference Level number to a higher value than the other 3
and it will be chosen to be the rest channel less often than others.
•
If RF channels had the same performance, coverage and resistance to interference there would be no need for this control. But
often this is not the case. There’s no point in granting equal access to the fourth repeater if it has inferior coverage (for example).
•
Lower Preference Level numbers mean higher preference. Higher numbers mean the channel will be chosen less often as the next
rest/voice channel.
•
All the repeaters in a system may have the same value
(eg all 4 repeaters could have a Preference Level of 1) or they
all could be different.
Data on Voice Slots
•
All data is sent on trunked Voice Slot
•
Enables single repeater (2 slot) trunking
•
Data will contend with voice calls for channel resources
•
Recommended that data load is small to minimize voice call
channel busies
Revert & Voice Slots
Data on Revert AND Voice Slots
•
The ability to offload data on Revert Slots
•
This is data from a subscriber to an application server
•
Example: GPS Location updates
•
Example: Text messages to text server
Server to SU data on trunked Voice Slots
•
More efficient
•
Radios do not have to scan Data Revert Slots
•
Minimizes late entry scenarios for voice calls (Voice Quality of Service)
•
•
Radios receive messages when idle
Example: Text message from server to radio
SU to SU data on Trunked Voice Slots
•
Radio to radio text messages
Note: You cannot utilize one
slot for data revert and the
other slot for trunking
Capacity Plus Data Revert
•
A Capacity Plus System can be designed to have a “data
subsystem”
•
This system contains a group of dedicated repeaters that are
used to offload data only
•
•
They are NOT used for voice
12 repeaters can be combined to create a revert system
•
24 data revert slots
•
These slots, like voice slots are programmed into the subscriber
•
Radio subscribers move to the revert slots to send data
Do Data Revert Slots Trunk?
•
The Data Revert Slot does not trunk
•
Radio is programmed for all known revert slots
•
Radio will cycle through the list for revert data transmission.
•
If channel is busy, it will switch to the next revert channel in the
list to transmit data.
Capacity Plus Data Revert: Value Proposition
Greatly increases channel efficiency
•
•
•
Voice calls do not disrupt data
More data can be offloaded on system
Example: Faster GPS update periods
Understanding the subscriber revert process
Subscriber cycles through it’s list of data revert slots to send its data
Subscriber evaluates up to 4 data revert channels
•
Tries to find an idle channel and TX the data
Example 1
Example 2
•
Evaluate 1st channel in list – busy
•
Evaluate 1st through 4th channels – all busy
•
Evaluate 2nd channel in list – busy
•
•
Evaluate 3rd channel in list – idle
Return to trunked channels and set a random hold
off timer
•
Transmit data
•
•
Random hold off timer expires –radio looks to
send data again
Return to trunked channels
•
Evaluate 5th channel in list – idle
•
Transmit data
•
Return to trunked channels
Data System: Trunked Control Station
Capacity Plus Systems utilise a “Trunked Mobile” control station
•
Connects to an Application Server
•
•
Always follows rest slot
Returns all data ACKs to the subscribers (from application)
•
•
Delivers text messages to radio system from text applications
Legacy data applications still also utilise control stations
Must be programmed with all known Voice Slots
•
Sends all data on the voice slots (Rest Slot)
Systems can have more than one (1) Trunked Control Station
•
Driven by the amount of application data sent to the radio system
•
Can be dedicated to a range of radios
•
Example: TCS 1 can address radios 1-100, and TCS 2 can address radios
101-200
Mobile Control Stations Summary
Subscriber cycles through it’s list of data revert slots to send its data
Subscriber evaluates up to 4 data revert channels
•
Tries to find an idle channel and TX the data
Trunked Control Stations
These stations move with the rest slot
and send data to your radio fleet
Data Revert Control Stations
Up to 24 stations can be utilized to
receive data from your radio fleet
Understanding the Control Stations
Trunked Control Station
101001
Application Server
101001
Revert Control Station
Slot 1
Slot 1
Revert Control Station
Capacity Plus Rest Slot
Capacity Plus Data Revert System
Operation:
1)
Upon power up a radio sends its registration data to an application, this is sent on the Legacy Control
Station (this operates like conventional MOTOTRBO today)
2)
The Trunked Control Station “returns the ack” to the most current rest slot
Data Reverts Channel: How it works?
A
Slot 1
B
C
A
Slot 2
Slot 5
B
Slot 6
S
5
S
6
Application Server
IP Switch
B
C
Slot 3
C
Slot 4
Slot 7
Slot 8
S
7
S
8
Do I NEED Data Revert?
•
•
It is not required to create a data revert system
Radios can be programmed to send data on voice slots
•
This can reduce data reliability and QoS
•
Especially in very large fleets
Data Revert loading table
Repeater 1
Update
Period
1 Minute
2 Minute
3 Minute
4 Minute
5 Minute
Repeater 2
Repeater 3
Repeater 4
Revert Slots Revert Slots Revert Slots Revert Slots Revert Slots Revert Slots Revert Slots Revert Slots
1
2
3
4
5
6
7
8
20
40
60
80
100
120
140
160
40
80
120
160
200
240
280
320
60
120
180
240
300
360
420
480
80
160
240
320
400
480
560
640
100
200
300
400
500
600
700
800
Every Revert Repeater added greatly increases the amount of supportable subscribers
Fully Loaded Capacity Plus System
12 Voice Slots
Up to 1200
Subscribers
RDAC
24 Data Slots
GPS
36 Control Stations
TEXT
Telemetry
Capacity Plus Application Support
•
•
Most existing 3rd party applications will be usable on Capacity Plus,
however…
…due to some data enhancements some slight modifications will need to
be made by the developer of your application
Motorola’s Text Messaging & Location Services Suites, have NOT been optimized to
work with Capacity Plus
Fault Tolerance Conditions
Voice Repeater Fails
•
Receive an indication on RDAC
• If it’s being used
•
System remains operational
• Will operate with less capacity
•
Heavily loaded systems could experience
higher instances of system busies
All Channels are busy
•
Radio will ‘bonk’
•
Display radios will exhibit “system busy”
string
IP Switch fails
•
Receive an indication on RDAC
• If it’s being used
•
Radios will continue to “trunk” but only on
the repeater that they were on at the time
of failure
•
All repeaters revert to a “2 slot trunked”
configuration
•
Radio distribution will impact system
performance
System Planing &
Programming
System Planning: Channel Frequencies
•
Is this a new system?
•
Are the frequencies being used new?
•
•
If yes, have propagation studies been completed
Are there any interference issues that need to be
addressed?
System Planning: Channel Loading Considerations
•
How many users will be on the system?
•
Will the system add new users in the future?
•
•
Applies to voice and data users
System planners should design the system to accommodate future users that
may be added
•
It is possible that more channels may need to be added if larger volumes of
subscribers are added
•
Capacity plus ideally can support 100 subscribers / slot
•
If attempting to put 300 subscribers on a 2 slot voice system “busies” could
result.
•
Adding more data radios or shortening the GPS update period could also drive
the need for more revert slots on the system
•
Plan accordingly!
See the MOTOTRBO System Planner for detailed loading specifications
System Planning: Future Considerations
•
How many users will be on the system?
•
The number of users and talk patterns should drive the amount of
voice slots required
•
High traffic patterns will require more channels in the system to
ensure a good QoS
•
Will the system add new channels, talk groups in the future?
•
•
Applies to voice and data revert channels
It is important to note that all subscribers will need to be
reprogrammed if new channels or TGs are added in the future.
See the MOTOTRBO System Planner for detailed loading specifications
Know Your System Topology!
•
MOTOTRBO CPS has been slightly changed to accommodate
Capacity Plus programming
•
System programmers still need to follow the same logic as
programming a conventional system
•
Plan the system in advance!
Programming methodology
Like a conventional system plan the following:
1.
What are / how many voice channels do I need to program?
2.
What are the Talk groups that I need to program?
3.
What TGs do I need to hear on MY radio?
4.
Will I be using a data application
5.
If using data revert, what are the channels?
6.
Do I need more than 1 zone?
1.
Do I need to access an IP Site Connect system
2.
Do I need to access a conventional system
Example: Simple System Design
1.
Plan number of Talk Groups and users in each
2.
It is also helpful to plan ID schemes and assess assumed traffic loading
3.
Evaluate data traffic assumptions
Talk Group
Name
Talk Group ID
Users / Group
Activity
Applications
Group A
100
40
High
GPS 3 min update
Group B
120
60
High
NO
Group C
130
50
High
NO
Group D
140
50
Low
GPS 3 min update
•This system will have 200 users and 4 talk groups
•It will also require data revert channels (90 radios sending 3 minute GPS updates)
Example: Simple System Design
Talk Group Name
Talk Group ID
Users / Group
Activity
Applications
Group A
100
40
High
GPS 3 min update
Group B
120
60
High
NO
Group C
130
50
High
NO
Group D
140
50
Low
GPS 3 min update
•
In the following example we will program 2 voice repeaters (4 voice slots)
•
We will program 1 Data Revert Repeater (2 data slots)
•
•
Note: at 3 minute intervals 1 repeater (2 slots) can accommodate 120 subscribers
We will program 1 portable for all the channels referenced and 4 Talk groups, as well
as a few private ids.
Guidance on the following programming
•
The following slides will highlight changes specific to Capacity Plus
programming
•
They assume that basic programming i.e. radio ID, group ID programming etc.
are understood.
Program a Voice Repeater
•Open a repeater sample:
•Right click on zone: add “Capacity Plus Voice Channel”
•You may delete the default channels once you
•add the capacity plus channel.
•Program frequency information etc.
•Note: Adding a single channel automatically creates 2 Voice
•Slots labeled 1& 2. (Slot Channel ID above)
•Rename the channel if desired
Program a Voice Repeater
•On the Networks tab turn on IP Site Connect.
•Designate the repeater a Master or Peer. Note only 1 Master
is required per Capacity Plus system
Program a Voice Repeater
•Repeat the same process for the secondary repeater,
however, note that in the slot channel ID field you need to
increment the Slot channel ID to 3, which will automatically
create a 4th slot
Program a Data Revert Repeater
•Programming a Revert Repeater is straightforward, click on zone,
add “Capacity Plus Data Channel, rename as required.
•Program frequency information etc.
•Like, Voice Channels, you will need to turn on IP Site Connect in
the Networks tab
NOTE: Capacity plus uses the IPSC protocol even though it operates in single site only.
Programming Summary
•
•
We now have 2 Voice Repeaters programmed
•
Slots 1&2
•
Slots 3&4
We now have 1 Data Revert Repeater
•
Slots 1&2
•
You will need to verify that you have turned IP Site Connect on for
both repeaters.
•
Capacity plus uses the IPSC protocol
CPS Quick Start – Subscriber checklist
•
Add CapPlus Private IDs – Who do you want to be able to talk to?
•
Add CapPlus Group IDs Build –What Talk Groups do you need access to?
•
CapPlus RX Group Lists –What Talk groups do you need to hear?
•
Add Voice Channels in Pool – One covers both slots (only 1 entry for each repeater)
•
Add Data Channels in Pool – One for each slot (2 entries for each repeater)
•
Build Voice Channel Lists – add Voice Channels in order
•
Build Data Revert Lists – order doesn’t matter
•
Add a CapPlus Personality to regular Zone
•
•
Reference Voice List
•
Reference Data List
•
Reference RX Group List
•
Reference TX Contact
Remove any default Analog or Conventional Digital Channels that you are not
planning to use.
Program a Subscriber Radio: Private IDs
Add Capacity Plus private IDs
CPS Quick Start – Subscriber checklist
•
Add CapPlus Group IDs Build –What Talk Groups do you need access to?
Program a Subscriber Radio: Group IDs
Add Capacity Plus Group IDs
CPS Quick Start – Subscriber checklist
•
CapPlus RX Group Lists –What Talk groups do you need to hear?
Program a Subscriber Radio: RX Group List
On the RX Group List, highlight TG List 1 under
Capacity Plus.
Then highlight and add the TGs to this list.
These are the TGs that you wish to hear on your
subscriber.
You may rename this list.
CPS Quick Start – Subscriber checklist
•
Add Voice Channels in Pool – One covers both slots (only 1 entry for each repeater)
Programming the Subscriber: Channel Pool
•
Capacity plus subscribers contain a special zone called a Channel Pool
•
This zone allows programmers to add all the channels that may potentially be
used in the system
•
Analog
•
Digital
•
Capacity Plus Voice
•
Capacity Plus Data
•
This zone is deliberately not viewable by the end user
•
This becomes a “holding place” for all channels that don’t need to be directly
accessed by the end user
•
•
Via channel knob / rocker
•
Or via menu
Reasoning: There is no reason for the user to physically access a data revert
Program a Subscriber Radio: Add Voice Channels to Channel Pool
Under Channels, you will see Channel Pool, right
clicking on the Pool will allow you to add any type
of MOTOTRBO channel. Add Capacity Plus Voice
Channel this will create a single channel, however
it will encompass (2) Voice Slots
CPS Quick Start – Subscriber checklist
•
Add Data Channels in Pool – One for each slot (2 entries for each repeater)
Program a Subscriber Radio: Add Data Channels to Channel Pool
Right clicking on the Pool will allow you to add any
type of MOTOTRBO channel. Add Capacity Plus
Data Channel this will create a single channel,
however it will encompass (1) Voice Slots. This will
need to be done twice / repeater.
Program a Subscriber Radio: Add Data Channels to Channel Pool
Note: Adding a Data channel only creates (1) data
slot, therefore (2) must be added / repeater. You
will need to assign a slot to each data channel
created. All channels (voice & data) can be
renamed to coincide with their function
CPS Quick Start – Subscriber checklist
•
Build Voice Channel Lists – add Voice Channels in order
Program a Subscriber Radio: Create Voice Channel List
Under Capacity Plus entry, Create a Voice
Channel List, this is all the channels that will be
accessible in the Capacity Plus system. Add them
according to their slot order, i.e. 1&2, then 3&4….
CPS Quick Start – Subscriber checklist
•
Build Data Revert Lists – order doesn’t matter
Program a Subscriber Radio: Create Data Revert List
Follow the same process for the data channel list.
Order of addition to the list does not matter.
CPS Quick Start – Subscriber checklist
•
•
Add a CapPlus Personality to regular Zone
•
Reference Voice List
•
Reference Data List
•
Reference RX Group List
•
Reference TX Contact
Remove any default Analog or Conventional Digital Channels that you are not
planning to use.
Program a Subscriber Radio: Create A Capacity Plus Personality
Under the Zone, right click and Add Capacity Plus
Personality, you may delete the rest of the
channels in the zone once added. These channels
are defaulted there. You can also rename the
personality to be more descriptive
Program a Subscriber Radio: Program the Capacity Plus Personality
If using data, turn on
ARS
Add Voice list created in previous step
1
Add Data list created in previous step
2
Choose Contact TG
Add RX list created in previous step
3
4
Listen / Talk to only one talk group
•
1.
2.
It’s easy to program a Capacity Plus radio to talk and listen to a single talk group
When creating RX list ONLY add the single TG that you wish to hear
Add that TG as your Contact Name on the Capacity Plus Personality
ONLY add TG A to Rx
List
TG A is the contact
name on the Capacity
Plus Personality
Programming Summary
So…what do we have?
• 2 Voice repeaters
•
•
•
1 Data Repeater
•
•
•
Slots 1&2
Slots 3&4
Slot 1
Slot 2
4 Talk Groups
Understanding Capacity Plus Beacons
•
The Capacity Plus repeater hosting the rest channel will send out a beacon every Beacon Interval (ms). The subscriber units listen
for the beacon and if they don’t hear it in the specified interval they’ll go thru the Voice List looking for the next rest channel. If a
subscriber hasn’t found a rest channel in the Rest Channel Acquisition TOT (min) then it will sound a tone indicating to the user
that it has lost the system.
•
The intervals for the repeater and subscriber should be set to the same value.
Understanding Capacity Plus RSSI Threshold
•
FCC Type 1 compliance may not be an issue for areas outside the
United States. However, the RSSI Threshold (dBm) is used in
Capacity Plus systems to determine if a repeater is available to
become the next rest channel or not.
•
For example, if the RSSI Threshold (dBm) is set to -115 for repeater
1 in a 4 repeater Capacity Plus system and the rest channel is
currently on repeater 2. Repeater 1 may have RF interference
(analog or digital) above that threshold at -110dBm then repeater 1
channel will be considered ‘busy’ and it will take itself out of
contention to become the next rest channel and the next rest
channel would end up being assigned to repeater 2, 3 or 4.
•
If you always want the repeater to be considered a candidate for
the next rest channel assignment regardless of ambient RF levels
you should set this value to the maximum -40dBm value.
Improving Channel Capacity by Adjusting Hang Times
•
MOTOTRBO supports message trunking by keeping a channel reserved for the duration of hang
time after a transmitting radio has de-keyed the microphone. During the hang time, only the
members of the ongoing call can start a transmission.
•
The advantage is that it provides guaranteed access to the channel for the duration of a
call.
•
The disadvantage is that the channel remains unused during the hang times.
•
To improve channel utilization, change the call hang time in the repeater.
•
Set to Zero (0) - system acts as if the channel is allocated for only one transmission
(Transmission Trunking)
•
Reduce call hang time from the default value - may improve overall call throughput if there
are many members in a group, and they are replying instantly to the group call
•
Increase call hang time from the default value if the group members are not replying
instantly to the communication and the channel still needs to be reserved, to prevent group
call participants from switching to other group calls or loosing the channel when the system
may becomes busy with other calls
Ways to Improve Data Throughput
Compress the UDP/IPv4 headers between radios (including control stations)
•
•
•
applies to clear, Basic Privacy, and Enhanced Privacy transmissions in both repeater mode
and direct mode
transparent to server applications
Radios sends compressed data messages only if the feature is enabled, but they process
compressed data messages even if the feature is disabled. A legacy MOTOTRBO radio
cannot receive compressed data messages.
Use unconfirmed data message
Note: GPS data in IP Site Connect and Capacity Plus modes is always unconfirmed and not
configurable
Transmit a data message with or without the preambles
•
•
MOTOTRBO radio sends one (in repeater mode) or two (in talkaround mode) preambles for
increasing the battery life.
If there are legacy radios (i.e. release 1.4 or earlier) in the system, all the radios in the
system should be configured to send battery saver preambles.
Call Priority in Capacity Plus Mode
•
If there is more than one calls active in a Capacity Plus system, then a radio joins its
most preferred call in the following conditions:
•
The call that the radio was participating in, ends
•
A radio powers on, or returns from a fade when all trunked channels are not
busy.
•
•
The preference list for a radio (in decreasing order) is:
•
All Call
•
the radio’s transmit talkgroup
•
the radio’s receive talkgroup
Call priority is enforced by a radio only while it is entering a call. Once the radio
joins a call, it will not look for any other high-priority call in the system (except
an All Call).