DMR Tier III Trunking Pro VR-3 System



Excera DMR Tier III Trunking Pro VR-3, developed on ETSI DMR open standards, is an IP-based and soft switching-adopted digital trunking system infrastructure designed to provide interconnection for base stations across various geographic areas. Automatic roaming is available for radio units (MSs) in the network coverage. The Mobile Switching Center (MSC) in the system has its backup and each base station can operate in single site mode with less capacity when the MSC is down. MSs in the system can communicate with PSTN/PABX and SIP phones and MSs in the MPT trunking system and DMR conventional system. The Network Management System (NMS) supports SNMP and adopts (Browser/Server) B/S structure. This system provides AIS interface for further development, such as dispatching application.


VR-3 digital trunking simulcasting system which is based on DMR T3 standard with the latest digital trunking simulcasting technology. It features good voice quality, high spectrum utilization, strong security and confidentiality, flexible and reliable networking and easy interconnection.VR-3 digital trunking simulcasting system integrates voice communication, data transmission, command and dispatching functions, realizes intelligent management of work groups on the same platform, and brings powerful and excellent communication experience of digital age to users. Its powerful business functions and multiple extension applications can help improve daily operation and management efficiency and enrich management means of enterprises.

Technical Features


?Full IP architecture.

?Modular design.

?Support GPS positioning.

? More safety with encryption.

?Large capacity and big regional coverage flexible networking.

?Digitalized voice and enhancing the anti-jamming ability, which ensuring the good voice quality.

?No base station controller server design with higher reliability and lower cost.

?Adopt dual time slot TDMA technology and spectrum utilization is four times of MPT1327 system.

?Seamless hand-over and keep continuous communications when trans-regional.

Main Technical Patameters


?Signaling Standard                                                         ETSI DMR/PDT

?Frequency Range                                                          300-360MHZ/350-400MHZ/400-470MHZ/450-520MHZ/136-174MHZ


?Working Mode                                                                TMO/RMO

?Channel Space                                                              12.5KHZ/TwoTime-Slot

?Modulation                                                                     4FSK

?Connecting Time(Single BS)                                          <240ms

?Connecting Time(Multiple BS)                                        <700ms

?Networking Interface                                                       E1/IP

?Access Interface                                                            10/100M Auto-adaptable Ethernet Interface

?Working Voltage                                                             220V AC

?Max MSC Capacity                                                         No limited

?Base Station Capacity                                                    No limited

?Carrier Capacity per MSC                                              More than 400

?Carrier Capacity per Base Station                                 32

System Key Features


?Superior Reliability

Modularized design and multi-level fault-tolerant capability for enhanced reliability and e?ciency.Interference monitoring and link detection features guarantee the high performance of the system. Redundancy capability for key hardware components such as base station control unit and trunking main control channel.

MSC supports local and geography redundancy mechanism. When one fails, the other one can take over its services immediately.

?Voice Services

Private call, group call, emergency call, broadcast call, all call, phone call (PSTN and PABX), call via MPT gateway and call via DMR conventional gateway.

?Data Services

Long and short text message, GPS polling, status message, emergency alarm and packet data.

?Supplementary Services

Late entry, ambience listening, monitor, talk group scan, override/ interrupt, dynamic group number assignment, call recording, dynamic base station assignment, call priority, call duration limitation, talk group hunt, subordinate group call, super group call, group call merging, full duplex private/ group call, OTAP, TX pre-empt, queue, call display, call alert, talker ID identi?cation, call permission, group patching, channel monitor, call forwarding and call end alert.

?Security Services

ESN check, authentication, kill/stun/revive and end-to-end encryption.

?Mobility Management

Registration, additional authentication & registration, deregistration, roaming, handover and participant group attachment.

?Network Management

Con?guration management, subscriber management, fault/alarm management, device management, performance management, security management, log management, system topology presentation and remote management and upgrade.

?Powerful Dispatching Services

The client/server structure ensures networking and user-friendly operation interface and versatile functions: voice call, text message, visible dispatching, track playback, channel monitor, log management, multiple screen and touch screen.

?Recording/Query Services

Recording, playback and statistics & analysis.

?Bigger Coverage

Fully compliant with DMR Tier 3 technology which born with the advantage of big coverage over other technologies.Non-linear ampli?er.

?Flexible Networking

The IP-based architecture enables ?exible networking.

Di?erent gateways are provided to connect with other system, such as PSTN, MPT, Tetra, FM, DMR conventional, etc.

?High Spectrum E?ciency


System Composition

?Base Station(VR-3200)

?Base Station Antenna

?DMR Repeater (ER9000)

?Mobile Switching Center(VR-3100)

?Network Management(VR-3400)