Motorola MOTOTRBO SYSTEM PLANNER Specifications Page 127
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118 System Components and Topologies
November, 2008
3.2.2 Repeater Mode
There are a few reasons why a customer may require a repeater in their system. The first is, if the
required coverage area is large, they may require strategically located high power repeaters in
order to cover all of their operating space. Even if their required coverage area is small, due to
geographical limitations such as mountains, valleys or man made obstructions, they may still need
multiple high power repeaters to reach all the coverage areas. They also may need the extra
bandwidth a repeater offers. One channel may not be able to support a large number of users;
therefore additional channels may be required.
In many of these cases, the insertion of a MOTOTRBO repeater can alleviate the problems with
minimum additional cost. Such a repeater is transparent to field radio communications. They just
select the required channel using their channel selector, and continue their normal
communications. However, as in most conventional systems, if the repeater coverage does not
overlap, the user needs to know his location, and switch to the other channel when required.
Even just having one MOTOTRBO repeater provides increased user capacity. The digital repeater
operates in TDMA which essentially divides one channel into two virtual channels in digital mode;
therefore the user capacity doubles. Without the repeater, this TDMA synchronization is not
possible. The repeater utilizes embedded signaling to inform the field radios of the status of each
channel (time slot). It informs the field radios of each channel’s busy/idle status, the type of traffic,
and even the source and destination information.
Another advantage during digital operation is error detection and correction. The further a
transmission travels, the more interference it encounters, and inevitably more errors are
introduced. The receiving MOTOTRBO radio, operating in digital mode, utilizes built-in error
detection and correction algorithms, native to the protocol, to correct these problems. The
MOTOTRBO repeater uses the same algorithms to correct the errors prior to retransmission, thus
repairing any errors that occur on the uplink; it then transmits the repaired signal on the downlink.
This greatly increases the reliability and audio quality in the system, which increases the
customer’s coverage area.
In digital mode, the repeater only retransmits digital signals from radios configured with the same
system identifier. This aids in preventing co-system interference. The repeater does not block
transmissions of radios within its own system.
As previously described, the repeater utilizes embedded signaling to announce the current status
of each channel. It is up to the radios in the field to interpret these signals, and grant or deny their
user’s request for transmission. Therefore, when a user or a group of users utilizes a channel (time
slot), the repeater announces that the channel is being used and who is using it. Only radios that
are part of that group are allowed to transmit. The repeater additionally allows a short duration of
reserved time after a transmission. This allows other users in the group to respond to the
originator. This reserved hang time greatly increases the continuity of calls, because new calls
cannot start until the previous call ends. Without this feature, users may experience delays in
responses (that is, between transmissions of calls), due to other calls taking over the channel in-
between their transmissions.
After this reserved hang time, the repeater stays active for a short period of time, and offers an
opportunity for any user on the system to transmit or start a new call. If no user transmits for a
duration of time, the repeater stops transmitting. When the next radio transmission occurs, the
repeater starts repeating again.
- System PlannerSystem Planner 1
- Manual Revisions 3
- Computer Software Copyrights 3
- Documentation Copyrights 3
- Disclaimer 3
- Trademarks 3
- Section 1 Introduction 4
- SECTION 1 INTRODUCTION 10
- 1.2 Software Version 11
- 2.1.1.3 Part Three: Framing 13
- Today’s Analog 15
- MOTOTRBO 15
- Analog 2-Channel System 16
- MOTOTRBO 2-Channel System 16
- Voice Call 2 (or Data) 17
- Voice Call 1 (or Data) 17
- Improving Audio Quality 20
- Analog Digital 20
- Professional Series 22
- Operations 23
- 2.3.1.1 Group Calls 29
- 2.3.1.2 Private Calls 29
- 2.3.1.3 All Call 30
- 2.3.2.1 PTT ID and Aliasing 31
- 2.3.2.3 Remote Monitor 32
- 2.3.2.4 Radio Check 32
- 2.3.3 Digital Emergency 33
- 2.4.1 Overview 37
- 2.4.3 Location Services 41
- Disabled 43
- 2.4.3.4 GPS Revert Channel 45
- 2.4.4 Telemetry Services 46
- 2.4.4.2 Telemetry Examples 47
- 2.5 Scan 48
- 2.5.1 Priority Sampling 49
- 2.5.2 Channel Marking 50
- 2.5.3 Scan Considerations 50
- Scanning 55
- 2.6 Site Roaming 57
- 2.6.2 Active Site Searching 58
- 2.6.3.2 Scan or Roam 62
- Low Roaming RSSI Threshold 63
- High Roaming RSSI Threshold 63
- Not Roaming 63
- Good Coverage 63
- 56 System Feature Overview 65
- 2.7 Voice and Data Privacy 71
- 2.7.3 Scope of Protection 72
- 2.7.7 Key Mismatch 76
- Desk Set 82
- Remote Adapter 82
- Repeater 82
- GPIO Pins 84
- Antenna Switch 84
- 2.9.2 Usage Consideration 86
- 2.10 Analog Features 87
- Feature Name Description 88
- Fixed Pins Description 91
- CPS Programmable 91
- Description 91
- NA = Not Applicable 92
- 2.10.4.3.2Zetron Controllers 93
- 2.10.5 Comparison Chart 95
- Digital Signaling Features 96
- Analog Scan Features 96
- Digital Scan Features 96
- Mixed Mode Scan Features 96
- Feature Name DM 3601 96
- Developer 97
- Application Partner Program 98
- November, 2008 100
- 92 System Feature Overview 101
- TOPOLOGIES 102
- 3.1.2 Mobile Components 105
- Battery Type Battery Life 106
- 3.1.2.1.1 User Interface 107
- 3.1.2.2 MOTOTRBO Mobile 110
- 3.1.2.2.1 User Interface 111
- 3.1.2.2.6 Text Messaging 113
- 3.2 System Topologies 115
- “Door Open” 118
- esirpretn 121
- Radios in Direct Mode 125
- 3.2.2 Repeater Mode 127
- esirpretnE 134
- 3.2.3 IP Site Connect Mode 140
- Mu lti-Channel Device Driver 142
- ( MASTER ) 143
- Local Area 146
- Wide Area 148
- 4.1 Purpose 152
- 4.2 Migration Plans 152
- 4.3 Frequency Licensing 153
- 4.4.3 Estimating Loading 156
- 4.6.1 System Capacity 167
- IP Site Connect 168
- System 2 168
- 4.6.3.2.1 Delay/Latency 170
- 4.6.3.2.2 Jitter 171
- 4.6.3.2.3 Packet Loss 171
- Private Network 176
- Radio IP 185
- Accessory IP/PC Network 185
- Interface IP 185
- 16776415 196
- Administrative 197
- Repeater Mode or Direct Mode 198
- 4.8.6.3 All Call 199
- 4.8.6.4 Radio Disable 199
- 4.8.6.5 Remote Monitor 199
- 4.8.6.6 Radio Check 200
- 4.8.6.7 Call Alert 200
- 4.8.7.5.1 Emergency Alarm 204
- Location Request 205
- Location Request (Emg.) 205
- Considerations 209
- 4.11 Failure Preparedness 211
- 4.12 Configurable Timers 212
- Description Notes 213
- 5.1 Purpose 218
- 5.2 Applications Overview 218
- 5.3 Service Equipment 218
- Motorola Part No. Name 220
- 5.4.2 MOTOTRBO Trainings 221
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