System Structure and Components

SCT-2000 digital Trunking system is made up of base-station, networks management terminal and mobile.

1. Base-station: using RLX8310 flat, is made up of Main Control Unit, Channel Control Module, Register Unit, Prompt Voice Unit, Cycle Trunking Unit, Digital Trunking Unit, Dispatching Unit, Integrate power supply, Control Bus Box, Repeater, Antenna and Feeder, Cabinet, and so on.
2. Networks management terminal: can configure computer networks according to using requirement. The computer networks can include Communication Server, Dispatching Terminal, maintenance Terminal, networks HUB, and so on.
3. Mobile: including portable, vehicle radio, Data adapter, Data Display Terminal, and so on.

SCT-2000 Site structure diagram

RLX8310 System Structure

RLX-8310 station control plat include Digital Voice Exchange Unit (VXU), Digital Voice Channel Control unit (VCM), Prompt Voice Unit (MUS), Digital Trunking Unit (DTU), Cycle Trunking Unit (COB) and integrate power supply (PS-1), etc.

DXU- Digital Main Control Unit
It’s in charge of call handling, channel controlling and monitoring on the operation status of the other parts in the system. It also provides the real-time user management. Its 512×512 data transmission can be used for all kinds of voice and data transmission. The exchange unit has taken the redundant standby, which can greatly improve the system reliability.
DCM- Digital Channel Control Module
Full Duplex working method is of fail-soft ability. It can offer the function of channel controlling, traffic channel controlling and management. It can handle all the MPT1327 signaling and digital voice encode/decode. Each channel console can take the control of two channels.

Repeater–MX800

MX800 trans-receiver is employed in the base-station, which is the smallest full specification Base Station/Repeater in its class. With advanced modular construction techniques, as found in military grade equipment, MX800 has reliable and long lasting performance.

1. Power: 50W
2. Channel spacing: 25KHz
3. Channel: Max 128
4. Modular design
5. PC programmable
6. Power Supply: 13.8 VDC +/-20%
7. Temperature Range: –10 to +60°C
8. Duty Cycle: 100% continuous
9. Dimensions (W x D x H): 483 mm x 330 mm x 89 mm
10. Weight: 9 kg

Features

1. Frequency range: 30mhz～960mhz (each band)
2. Channel numbers: maximum 255
3. Transmitting modularization response: dc to 3.4khz

Using efficient two-point modulation technology and unique compensation process brings excellent frequency and phase linearity of transmitting modularization from dc to 3.4khz.

1. Transmitting time: 4ms

Apply advanced decimal divided frequency synthesizing technology to ensure fast lock of PLL.

1. Low spurious transmitting:

Efficient ellipse filter ensures low spurious transmitting, while unique soft-starting control technology ensures excellent transmitting transient feature.

1. Low conduction radiation

All radio frequency modules are encapsulated in individual, high shielding machine milled aluminum box to reduce conduction radiation.

1. Broadband design

Each performance index in working frequency band keeps high consistency, frequency changed without manual adjustment.

1. Intelligent power control technology

Intelligent power control technology provides complete protection on long time safe working for transmitter, while high reliable temperature controlling & aircooled system controls the transmitter working temperature efficiently.

1. Low power consumption

Mx800 keeps low current consumption no matter in transmitting or receiving state, and applies power save model to reduce standby power consumption further.

1. Transmitting/receiving modules are completely separately with multi frequency band duplex.

Transmitting and receiving are applied separately module to empower mx800 working in any transmitting/receiving frequency combination.

1. Comprehensive hardware/software working setting

Such as: dc modularization, trunk/base station function setting, monitor and conversation function of trunk state, squelching close etc 25 settings for user customization.

1. Computer programming setting

Applying mxtools to program various parameters of mx800 including frequency, power, frequency interval, ctcss calling selection etc.

1. Monitor function

Using computer to remote monitor working state of mx800 including real time parameters reading, state indication, alarm message etc.

Network and Dispatching Center

The network and dispatching center connect to the zone controller by TCP/IP. The max number of the terminal in the network is 32. The center consists of network management system and one Maintenance terminal, one Monitor terminal and dispatching terminals, running on the NT platform. The dispatching terminal is used for voice and command dispatching; the maintenance terminal is used for system parameter adjustment while the Monitor terminal is to monitor the system status.
 

1. Maintainer (SP-TM): It provides the function of configure, modify and save of the system and users. It can monitor and display the system status. It has Ethernet and RS-232 interface. It is the basic configure of the system.
2. Network controller (SP-CS): It provides the serve between network terminal and base-station. It has Ethernet and RS-232 interface. It is optional for dispatch console of network terminal.
3. Dispatching terminal (SP-DT): It can provide all of dispatching task, transit, chiming in, etc. It has Ethernet and RS-232 interface. Optional and multiple.

Maintenance Terminal （SP-TM）
Connecting with the site control unit through the NT network line, the Maintenance Terminal provides the following features:

1. System Management: Modify and save all sorts of the system parameters.
2. User Management: Dynamic regrouping and mobile inhibit and uninhibited
3. Real time monitoring: Display the status of each channel, Caller ID, Emergency call and fault report when the system testing is failed.
4. Monitoring/interposing: The Central Dispatching Station can monitor any channels, when interposing, the dispatching station will speak with broadcasting style to avoid self-triggering, and the radio communication channel will be cut off temporarily.
5. Remotely inhibit – remotely kill the radio or restore the radio.

Dispatch Terminal（SP-DT）
Connecting with the site control unit through the NT network line and voice line, the Dispatch Terminal provides the following features:

1. ?Voice dispatching: Private call, group call, fleet call, system call, transfer call.
2. Alarm calls: Display the emergency call called by the mobile user on the screen, and display the mobile user information for further action.

Digital Trunked Terminal

Two sorts of radio digital trunked terminals are available: portable radio NPT-800 and mobile radio NPT-868D. Both have three working modes: digital (analog) trunked, direct talk, conventional.
Besides the normal trunked function, there are some new functions such as dispatching broadcast, call locked GPS orientation and data transfer etc.