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 efficiency.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 identification, 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
Configuration 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 amplifier.
Flexible Networking
The IP-based architecture enables flexible networking.
Different gateways are provided to connect with other system, such as PSTN, MPT, Tetra, FM, DMR conventional, etc.
High Spectrum Efficiency
System Composition
Base Station(VR-3200)
Base Station Antenna
DMR Repeater (ER9000)
Mobile Switching Center(VR-3100)
Network Management(VR-3400)