Futurecom Mobexcom P25 User manual

MOBEXCOM P25
DIGITAL VEHICULAR
REPEATER
User’s Guide
8A083X20 (6881013Y38-P) Rev 16 April 2014

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NOTES

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Contents
Contents ........................................................................................................................3
Foreword........................................................................................................................8
Manual Revisions........................................................................................................8
Firmware.....................................................................................................................9
Computer Software Copyrights....................................................................................9
Document Copyrights..................................................................................................9
Disclaimer ...................................................................................................................9
Trademarks.................................................................................................................9
Commercial Warranty and Service ............................................................................10
Notations Used in This Manual ..................................................................................11
Declaration of Conformity ..........................................................................................12
RF Exposure................................................................................................................13
Introduction.................................................................................................................14
Identifying Your DVRS Model....................................................................................15
Frequency Band of Operation............................................................................................... 15
DVRS Mounting Arrangement .............................................................................................. 16
DVRS Operation Basics..............................................................................................18
DVRS Features by PSU Type ...................................................................................19
Powering up the DVRS..............................................................................................20
Turning ON the DVRS...............................................................................................21
Activating the DVRS via the Control Head ........................................................................... 21
Automatic DVRS Activation (AVRA)..................................................................................... 21
Remote Activation of the DVRS............................................................................................ 22
Turning OFF the DVRS.............................................................................................24
Deactivating the DVRS via the MSU Control Head .............................................................. 24
Deactivating the DVRS via Call Alert sent by Dispatch ........................................................ 24
Automatic DVRS Deactivation.............................................................................................. 25
DVRS Status Display.................................................................................................26
DVRS Enabled PSUs................................................................................................27
DVRS Status Tones ..................................................................................................28
DVRS Status Tones - MSU Speaker.................................................................................... 28
DVRS Status Tones - PSU................................................................................................... 29
‘DVRS Enabled’ Mobile Radio TGs / Channels..........................................................31
‘DVRS Disabled’ Mobile Radio TGs / Channels.........................................................31

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DVRS Modes of Operation........................................................................................32
OFF Mode............................................................................................................................. 32
SYSTEM Mode ..................................................................................................................... 32
LOCAL Mode ........................................................................................................................ 33
Selecting DVRS Mode...............................................................................................33
Selecting DVRS Mode from the Control Head...................................................................... 33
Strapped DVRS Mode .......................................................................................................... 33
Selecting DVRS Channel ..........................................................................................34
Independent DVRS Channel Change................................................................................... 34
Strapped DVRS Channel Change ........................................................................................ 34
Primary / Secondary DVR Basics..............................................................................35
Permanent Primary Activation .............................................................................................. 36
Permanent Primary Deactivation.......................................................................................... 36
Multiple DVRS Operating on Different DVR Frequencies .................................................... 36
Legacy Mobexcom II Voting Compatibility Mode.................................................................. 36
MSU Scan.................................................................................................................37
P25 Digital Mode .........................................................................................................38
Digital Mode – Summary of Features ........................................................................39
Digital DVR Mode With P25 Trunking Mode Selected on MSU ........................................... 39
Digital DVR Mode With P25 Conventional Mode Selected on MSU .................................... 40
PSU Affiliation ...........................................................................................................41
Inbound Group Call ...................................................................................................41
Inbound Private Call..................................................................................................41
Inbound Call Alert......................................................................................................41
Outbound Group Call.................................................................................................41
Outbound Private Call ...............................................................................................42
MSU Mic PTT............................................................................................................42
In-Car Monitor ...........................................................................................................42
Talk Group Proxing ...................................................................................................42
Talk Group Translation..............................................................................................42
PSU Talk Permit Tones.............................................................................................43
Inbound Emergency Call / Alarm...............................................................................43
Emergency operation during TG Translation........................................................................ 44
Remote Steering via Call Alert Page to DVR.............................................................45
Remote Steering via Call Alert Page to MSU.............................................................46
Trunking System Status Indication ............................................................................46
Local Mode Indication................................................................................................46
Radio Check / Inhibit .................................................................................................47
P25 Trunking OTAR..................................................................................................47
Patch.........................................................................................................................47

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Dynamic Regrouping.................................................................................................47
Phone Interconnect ...................................................................................................47
Adaptive Power Control.............................................................................................47
Audio Buffering..........................................................................................................47
P25 Encryption..........................................................................................................48
Automatic PSU Revert to Talk Around (TA)...............................................................48
Digital Outbound Takeover........................................................................................48
Forced Analog Mode...................................................................................................50
Forced Analog Mode – Summary of Features ...........................................................51
Forced Analog DVR Mode With Conventional Analog Mode Selected on MSU .................. 51
Forced Analog DVR Mode With 3600 Trunking Mode Selected on MSU ............................ 52
Analog Mode................................................................................................................53
Analog Mode – Summary of Features.......................................................................54
Analog DVR Mode With P25 Trunking Mode Selected on MSU .......................................... 54
Analog DVR Mode With P25 Conventional Mode Selected on MSU ................................... 55
Analog DVR Mode With Conventional Analog Mode Selected on MSU .............................. 56
Analog DVR Mode With 3600 Analog or Digital Trunking Mode Selected on MSU............. 57
Inbound Call..............................................................................................................58
Outbound Call ...........................................................................................................58
MSU Mic PTT............................................................................................................58
Leading & Trailing Tones...........................................................................................58
Portable Priority Interrupt (PPI)..................................................................................59
Emergency in Analog Mode.......................................................................................59
Audio Buffering..........................................................................................................60
Remote DVRS Activation via DTMF..........................................................................60
Remote MSU Mode Steering via LPSU PL/DPL........................................................60
Steering and Emergency ...................................................................................................... 60
P25 Encryption in Analog Mode ................................................................................61
Mixed Mode .................................................................................................................62
Special Features Support ...........................................................................................63
Fireground Signaling .................................................................................................63
TPS Signaling ...........................................................................................................63
Troubleshooting..........................................................................................................64
Appendix 1 – DVR Specifications ..............................................................................65
Contact Information....................................................................................................66

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Glossary.......................................................................................................................67
Index ............................................................................................................................69

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List of Tables
Table 1 DVRS Compatibility Scenarios .........................................................................14
Table 2 In-Band DVRS Models .....................................................................................15
Table 3 Cross-Band DVRS Models...............................................................................15
Table 4 DVRS Features vs Type of PSU.......................................................................19
Table 5 DVRS Status Display Messages / Icons...........................................................26
Table 6 DVRS Enabled PSU Models.............................................................................27
Table 7 DVRS Status Tones (MSU Speaker)................................................................28
Table 8 P25 DVRS Enabled PSUs – DVRS Specific Tones..........................................29
Table 9 Analog PSU - DVRS Specific Tones.................................................................30
Table 10 OFF Mode DVRS Basic Operation .................................................................32
Table 11 SYSTEM Mode DVRS Basic Operation..........................................................32
Table 12 LOCAL Mode DVRS Basic Operation.............................................................33
Table 13 Primary DVR Definitions.................................................................................35
Table 14 Remote Steering Typical Scenarios................................................................45
Table 15 P25 Inbound & Outbound Encryption Scenarios in Digital Mode.....................48
Table 16 Handling of Inbound Encrypted Calls on Analog DVR Channel ......................61
List of Figures
Figure 1 Typical Cross-Band DVRS Layout...................................................................16
Figure 2 Typical In-Band DVRS Layout - VHF...............................................................16
Figure 3 Typical In-Band DVRS Layout - 700 or 800 MHz.............................................17

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Foreword
This manual provides User guidelines for all models of the Futurecom Mobexcom P25
Digital Vehicular Repeater (DVR). The DVR is designed to be interfaced to a Remote
Mount Motorola XTLTM5000 Mobile Subscriber Unit (MSU) with O3 or O5 Control Head
or to a Remote Mount XTLTM2500 with M5 Control Head.
When the DVR is interfaced to an XTLTM2500 or XTLTM5000 MSU, the complete
equipment package is referred to as Digital Vehicular Repeater System (DVRS).
The DVR may also be used as a standalone (Tactical) repeater. The operation of the
Tactical DVR is described in publication 8A083X21.
The DVR cannot be interfaced to XTLTM5000 radios which are using the W-series control
heads.
For W-series Control Head compatible equipment, please refer to the Mobexcom II
Analog VR Documentation.
For details on the DVRS Installation and Programming Guidelines, please refer to
publication 8M083X01.
For details on the XTLTM5000 and XTLTM2500 Mobile Radio operation, please refer to
the applicable User’s Manuals available from Motorola.
Manual Revisions
Revision #
Date
ECN
Notes & References
0
10/18/05
na
Original Release – Phase I
1
12/14/05
05170
Various updates
2
1/11/06
06005
Motorola Manual Number added
3
9/6/06
06183
380-430MHz operation added
4
12/20/06
06246
Phase II a operation update
5
11/26/07
07175
Phase II b operation update (App. 2.83)
6
09/30/2009
9085
Application 3.00 update
7
12/10/2009
9114
Application 3.10 update
8
04/23/2010
10030
Application 3.20 update, Not released
9
11/12/2010
10055
Application 3.22, customer specific release
10
2/1/2011
11005
Application 3.22, factory release
11
9/30/2011
11043
Application 3.30 update
12
1/18/2012
12005
Application 3.31 update
13
3/1/2012
12014
MSU and APX PSU FW compatibility update
14
3/16/2012
12026
Application 3.32 update
15
9/28/2012
12078
Application 3.40 update
16
25/04/2014
14019
Application 3.41 Update

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Firmware
The DVRS Operation described in this Document requires the following Firmware:
XTLTM2500 / XTLTM5000 - firmware release: Host R20.00.05
XTSTM1500 /XTSTM2500 / XTSTM5000 - firmware release R17.01.01.
APXTM4000 / APXTM6000 / APXTM7000 – firmware release R07.00.05 or later
O3/O5/M5 Control Head - firmware release R16.00.00
DVR must be loaded with firmware release:
Application 4C083X01 R03.41 or later
Tweaker Programming software – Version 3.45 or later
Computer Software Copyrights
The products described in this manual include copyrighted Futurecom computer
programs stored in semiconductor memories or other media. Laws in the United States,
Canada and other countries preserve for Futurecom certain exclusive rights for
copyrighted computer programs, including but not limited to, the exclusive right to copy
or reproduce in any form the copyrighted computer programs. Any copyrighted computer
program contained in the Futurecom products described in this manual may not be
copied, reproduced, modified, reverse-engineered, or distributed in any manner without
the express written permission of Futurecom. The purchase of Futurecom products shall
not be deemed to grant either directly or by implication, estoppels, or otherwise, any
license under the copyrights, patents or patent applications of Futurecom, except for the
normal non-exclusive license to use that arises by operation of law in the sale of a
product.
Document Copyrights
No part of this manual may be reproduced, distributed or transmitted in any form or by
any means, for any purpose without written permission of Futurecom.
Disclaimer
The information in this document is carefully examined and is believed to be entirely
reliable. However, no responsibility is assumed for inaccuracies.
Futurecom Systems Group, ULC. reserves the right to make changes to any products
herein to improve reliability, function or design. Futurecom does not assume any liability
arising out of the application or use of any product or circuit described herein.
Trademarks
MOTOROLA, ASTRO, XTLTM2500, XTLTM5000, XTSTM1500, XTSTM2500, XTSTM5000,
APXTM4000, APXTM6000, APXTM7000, MDC1200 are trademarks of Motorola Inc.

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Commercial Warranty and Service
Futurecom Systems Group, ULC. warrants to the original purchaser all standard
products sold by Futurecom Systems Group, ULC. to be free of defects in material and
workmanship for one (1) year from the date of shipment from Futurecom Systems Group
ULC.
Futurecom’s warranty hereunder DOES NOT cover the following :
(i) Defects or damage resulting from use of the product in other than its normal and
customary manner.
(ii) Defects or damage from improper installation, testing, operation, or maintenance.
(iii) Defects or damage due to alterations, modifications or adjustments carried out by
the Buyer without Futurecom’s explicit approval.
(iv) Defects or damage from misuse, accident, water or neglect.
(v) Freight costs to the repair depot.
(vi) Scratches or other cosmetic damage to the product surfaces that does not affect
the operation of the product.
(vii) Normal wear and tear.
The warranty set forth herein is conditioned upon proper storage, installation, use and
maintenance in accordance with applicable written recommendation of Futurecom. The
warranty furnished hereunder does not extend to damage to items purchased hereunder
resulting in whole or in part from the use of components, accessories, parts of supplies
not furnished by Futurecom Systems Group, ULC.
Futurecom’s sole obligation shall be to repair or replace, at Futurecom’s option, any
defective component or item and pay transportation expenses for such replacement at
no charge to Buyer who shall provide labor for the removal of the defective component
or item and installation of its replacement at no charge to Futurecom. Buyer shall bear
all risk of loss or damage to returned goods while in transit. In the event no defect or
breach of warranty is discovered by Futurecom upon receipt of any returned item, the
item will be returned to Buyer at Buyer’s expense and Buyer will reimburse Futurecom
for the transportation charges, labor and associated charges incurred in testing the
allegedly defective item.
Except as expressly provided herein, Futurecom makes no warranty of any kind,
expressed or implied, with respect to any goods, parts and service provided by
Futurecom including, but not limited to, the implied warranties or merchantability and
fitness for a particular purpose. The sole and exclusive remedy for breach of any
warranty is limited to the remedies provided in the paragraph above. Futurecom shall
not in any event be liable for any other damages arising out of or in connection with
furnishing of goods, parts or service hereunder, or the performance, use of, or inability to
use any goods, parts or service, or otherwise, whether based on contract, tort or any
other legal theory.
To exercise this warranty, please contact Futurecom’s Administration Department in
Concord, Ontario, Canada at 1-800 701 9180 to obtain a return material authorization
(RMA) and shipping instructions. No product will be accepted for return without an RMA.
The repair of a product by Futurecom pursuant to this warranty is warranted for the
balance of the original warranty period, or at least 90 days from date of shipment to
Buyer of the repaired product.

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Notations Used in This Manual
The following notations will be used throughout the text of this document:
NOTE:
A clarifying statement that expands on the text that follows.
IMPORTANT!
An important statement that should be considered and / or implemented in order
to achieve adequate equipment operation.
ATTENTION!
An instruction that must be followed to insure compliance with the appropriate
standards or proper equipment operations.

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Declaration of Conformity
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation.
FCC LABELS:
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions:
(1) This device may not cause harmful interference.
and
(2) This device must accept any interference received, including interference
that may cause undesired operation.

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RF Exposure
ATTENTION!
Changes or modifications not expressly approved by Futurecom Systems Group,
ULC. could void the User’s authority to operate the equipment.
To satisfy FCC/IC RF exposure requirements for mobile transmitting devices, the
minimum separation distances specified in the “RF Safety” Book (shipped with
the DVRS) should be maintained. To ensure compliance, operations at closer than
this distance is not allowed.
ATTENTION!
Futurecom requires the P25 DVRS operator to ensure FCC Requirements for
Radio Frequency Exposure are met. The minimum distance between all possible
personnel and the body of the DVRS equipped vehicle is specified in the “RF
Safety” book shipped with the DVR.
Failure to observe the Maximum Permissible Exposure (MPE) distance exclusion
area around the antenna may expose persons within this area to RF energy above
the FCC exposure limit for bystanders (general population).
It is the responsibility of the repeater operator to ensure MPE limits are observed
at all times during repeater transmissions. The repeater operator must ensure at
all times that no person comes within MPE distance from the vehicle body.

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Introduction
The P25 DVR allows Portable Subscriber Units (PSU) to be used in areas where only
MSU coverage is available and PSU coverage is either intermittent or does not exist at
all.
Installed in the trunk of a car, fire truck, armored vehicle, ambulance or configured as a
Transportable or Fixed mount DVR, the P25 DVRS extends radio communications when
the PSU users are outside of the vehicle, inside a nearby building or in any portable
radio marginal coverage areas.
The P25 Digital Vehicular Repeater (DVR) is designed to be seamlessly interfaced to a
Remote Mount XTLTM2500 or XTLTM5000 Digital Mobile Subscriber Unit (MSU) with M5,
O3 or O5 Control Head.
The DVR may also be used as a standalone (Tactical) repeater. The operation of the
Tactical DVR is described in publication 8A083X21.
The DVR not only extends voice (clear or encrypted) communications but it also
supports key trunking system features and can be configured to provide various
advanced options to the Users.
The following table summarizes the DVRS compatibility scenarios:
FIXED NETWORK TYPE / MOBILE RADIO MODE
Portable
Radio Type /
Mode
Conventional
Analog MSU
Conventional P25
MSU
3600 Analog /
Digital Trunking
MSU
9600 P25 Trunking
MSU
Conventional
Analog PSU
YES
A
YES
A/M
YES
A
YES
A/M
Generic
Conventional
P25 PSU
NO
YES
D/M
NO
YES
D/M
DVRS Enabled
Conventional
P25 PSU
YES
FA
YES
D/FA/M
YES
FA
YES
D/FA/M
Table 1 DVRS Compatibility Scenarios
*DVRS Channel Types:
A = Analog
D = Digital
M = Mixed
FA = Forced Analog

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Identifying Your DVRS Model
Frequency Band of Operation
Depending on the frequency band of operation of the MSU and the interfaced DVR, the
DVRS models are classified as follows:
In-Band – when the MSU and DVR operate in the same frequency band.
Cross-Band – when the MSU and DVR operate in two different frequency bands.
In-Band
The following In-Band DVRS Model Groups are available:
DVR BAND OF OPERATION [MHz]
136-174
380-430
450-470
470-512
764-776
794-806
806-825
851-870
XTLTM 2500
XTLTM 5000
BAND OF
OPERATION
[MHz]
136-174
380-470
OR
450-520
380-470
OR
450-520
380-470
OR
450-520
762-776
794-806
OR
806-825
851-870
762-776
794-806
OR
806-825
851-870
Table 2 In-Band DVRS Models
Cross-Band
The following Cross-Band DVRS Model Groups are available:
DVR BAND OF OPERATION [MHz]
136-174
380-430
450-470
470-512
764-776
794-806
806-825
851-870
XTLTM 2500
XTLTM 5000
BAND OF
OPERATION
[MHz]
380-470
OR
450-520
OR
762-776
794-806
OR
806-825
851-870
136-174
OR
762-776
794-806
OR
806-825
851-870
136-174
OR
762-776
794-806
OR
806-825
851-870
136-174
OR
762-776
794-806
OR
806-825
851-870
136-174
OR
380-470
OR
450-520
136-174
OR
380-470
OR
450-520
Table 3 Cross-Band DVRS Models
NOTE:
The DVR can be interfaced to a High Power MSU, however, the Transmit power of the
MSU must be reduced to comply with the maximum power restrictions described in the
RF Safety Booklet, which is shipped with the DVR.
External power amplifiers can not be used.
NOTE:
The In-Band filters connected to the MSU have typical insertion loss of 1.5dB.

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DVRS Mounting Arrangement
Side-By-Side DVRS
Side-By-Side mounting is the standard option for vehicular type installations. The Cross-
Band DVRS package includes a DVR Repeater and Duplexer Enclosure, mounted on
one side and a Remote Mount MSU mounted next to the DVR.
Figure 1 Typical Cross-Band DVRS Layout
The In-Band models are comprised of a DVR Repeater and its associated filtering
shelves mounted on one side, a model-specific in-band filtering shelf (shelves) mounted
as close as possible to the DVR and a Remote Mount MSU mounted next to the in-band
filtering.
Figure 2 Typical In-Band DVRS Layout - VHF
NOTE:
The DVR and MSU always require two separate antennas.

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Figure 3 Typical In-Band DVRS Layout - 700 or 800 MHz
Transportable DVRS
The Transportable DVRS is packaged in a durable suitcase and includes all necessary
electronics and filtering. The Transportable unit can be easily deployed in the field and is
powered up either by plugging into an AC outlet or by using an optional battery backup
kit.
The battery backup kit is also packaged in a suitcase for ease of transportation.
The Transportable Model requires two antennas - one connected to the MSU and one to
the DVR.
The MSU antenna needs to be strategically deployed in order to ensure reliable link
between the MSU and the Radio System Infrastructure.
The DVR antenna needs to be positioned to provide optimum radio coverage for the
portable radio users. For further details, please refer to publication 8F083X02.
Fixed DVRS
The Fixed DVRS model is housed in a wall-mount indoor enclosure and includes all
necessary electronics and filtering. The Fixed DVRS is intended for permanent i.e.
‘Fixed’ type installations. For further details, please refer to publication 8F083X01.
Fixed DVRS Transportable DVRS (TDVRS) Battery Pack
for TDVRS

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DVRS Operation Basics
IMPORTANT!
The Operation of the DVRS is determined by the following:
Firmware Options and Programming settings of the DVR (DVR personality).
Firmware Options and Programming settings of the XTLTM2500 / XTLTM5000
interfaced to the DVR.
Configuration Capabilities and Programmed settings of the Radio System.
Type and Programming settings of the Portable Radios used for
communications through the DVR.
IMPORTANT!
Depending on the selected Personality Settings and Configuration Capabilities of
the complete Radio System Infrastructure, the Options described throughout this
document may or may not be applicable to the specific DVRS operation.

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DVRS Features by PSU Type
When the PSU User is out of System Radio Coverage, the PSU can be switched to a
dedicated DVR channel so that the PSU can communicate via the DVRS. The features
available to the PSU User depend on the PSU type, programming and selected mode.
The table below specifies what features are supported by the different PSU types.
PSU FEATURE SUPPORT BY
DVRS
DVRS Enabled
PSU [Note 5]
Generic
P25 PSU
Analog PSU
REGISTRATION /
DEREGISTRATION
Yes
Yes [Note 1]
No [Note 3]
TALK GROUP
PROXING/TRANSLATION
Yes
Yes
No
GROUP CALL
Yes
Yes
Yes
PRIVATE CALL
Yes
No
No
EMERGENCY CALL/ALARM
Yes
Yes
Yes
P25 ENCRYPTION
Yes
Yes
No
CALL ALERT
Yes
Yes
No
FAILSOFT / OUT OF RANGE / SITE
TRUNKING INDICATION
Yes
No
No
LOCAL MODE INDICATION
Yes
No
No
TALK PERMIT TONES
(GENERATED BY PSU)
Yes
No
No
TRAILING TONES SENT BY DVR
No
No
Yes
RADIO INHIBIT
Yes
Yes
No
RADIO CHECK
Yes
Yes
No
P25 TRUNKING OTAR
Yes
No
No
ADAPTIVE POWER CONTROL
Yes
No
No
PHONE INTERCONNECT
Yes
No
No
PATCH
Yes
No
No
DYNAMIC REGROUPING
Yes
No
No
EMERGENCY ID PASS THROUGH
Yes
Yes
Yes [Note 2]
PSU HOT MIC
Yes [Note 4]
No
No
EMERGENCY REVERT
Yes
Yes
Yes
PSU SCAN
No
No
No
REMOTE DVR ACTIVATION via
CALL ALERT SENT BY PSU
Yes
Yes
No
REMOTE DVR ACTIVATION VIA
DTMF SENT BY PSU
No
No
Yes
REMOTE DVR ACTIVATION via
PSU EMERGENCY ALARM
Yes
Yes
Yes
(MDC1200)
Table 4 DVRS Features vs Type of PSU
Note 1 When selecting a DVR Mode on the Generic P25 PSU, it registers upon first Group Call. Generic
PSU is deregistered after a preprogrammed timer counting the period of inactivity expires.
Note 2 Supported only with MDC1200 capable portables.
Note 3 Analog PSU is registered on the P25 system with its MDC1200 ID if PSU Emergency (MDC1200) is
initiated.
Note 4 Requires firmware R12.00.13 or later in the PSU.
Note 5 The PSU models that can be programmed as DVRS Enabled are listed in Table 6

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Powering up the DVRS
The DVR powers up together with the MSU.
The Power up Mode and Channel are programmable.
Depending on the programmed personality, the DVR can power up in one of the
following states:
DVR Disabled Mode, last selected DVR channel
OFF Mode
SYSTEM Mode, last selected DVR channel
SYSTEM Mode, preprogrammed DVR channel
LOCAL Mode, last selected DVR channel
LOCAL Mode, preprogrammed DVR channel
If the DVRS powers up on a ‘Slaving enabled’ mobile radio channel, the DVR will be
steered according to the Talk Group selected on the MSU. The steering may involve
both DVR Channel and mode change.
NOTE:
For a detailed description of the DVRS Modes of Operation, please refer to the DVRS
Modes of Operation paragraph of this document.