highway emergency dispatching system solution


        This is the Emergency Telephone functional specification for the ET system Implemented along the expressway. The document will be divided into three portions namely Road side Equipment Hardware, Control Room Equipment Hardware and Software and Graphical user interface section.

        One number of the Single Mode fibre optics core will be used for all the site emergency telephone connectivity with the control room system. Each Master ET is equipped with Optical converter, (where it is the heart for the ET system) solar panel, solar charge controller, battery, Surge protection board.

        Each slave ET will be connected to the respective master ET. All the ET at the roadside are equipped with microphone, speaker and push button. When a road user makes a call from an ET, optical interface equipment(control room rack 1) will receives the signal and the Audio Matrix equipment(control room rack 1) will also receives the signal and establishes the communication between road user and operator and the recording will be started.The recorded conversation will be kept in the ET server. The operator in the control room will be equipped with Call In software to facilitate them to perform their task conveniently. The Call In software will be available on client computers. The operating system for the ET server and clients will be based on LINUX Operating System.

highway emergency dispatching system solution

Optical converter box

        Each pair of Emergency Telephone Call Box uses only one set of Optical converter box.


highway emergency dispatching system solution

  The whole system is generally leered in two locations:

        a. Roadside

        b. Control Room

Equipments that are involved at Roadside:

Item Description Functionality
1 Emergency Call Box(ECB) To mount caller interface equipment
2 Speaker and Microphone To allow voice reception and dissemination.
3 Push button To activate the system and alert the Control Cemre Operator
4 Solar Power System Consist of solar panel, batery changer and battery
5 Opcical Interface Fibre Based data and voice transmission electromic equipment

The Control Centre Unit:

Functional Deseription

        1.Location and identification of calling ECB

        2.Telephone communication control (put on hold, return to call, end of commucation)

        3. Ringing when an ECB is calling

        4. Visual indication of calling ECB number

        5.Queue control

        6. Automatic or manual test of ECB, setting

        7.Operating status of ECB (audio, on hold, stand-by, out of order).

        8.Call time recording

        9.Call transfer to another operator, 3 person conference communications.

        10. Automatic dialling of emergency service

        11. Automatic display of ECBOB and Central Control equipment status and alarms

        13. Conversation recording and tracing(with recorder option)

    The master ECB contain ECBOB, solar panel, battery charger, battery, a speaker, a microphone and a push button and slave ECB contain a speaker, a microphone and a push button.

highway emergency dispatching system solution


Microphone, speaker and push button positions in ET

Speaker and microphone specifications

Description Characteristic
Audio output level (0 to 5)W
Loudspeaker Impedance 8 Ohm 5W
Type Electro Dynamic Microphone

Battery specifications

Description Characteristic
Nominal Voltage 12 V
Rated Capacity 22 AH
Capacity 20 hour rate(900 mA) 18.0Ah
10 hour rate(1620 mA) 16.2Ah
5 hour rate(2000 mA) 10.0Ah
Internal Resistance Full Charged Battery ≤190 mΩ

Solar Panel Specifications

Description Characteristic
Nominal Voltage 18 V
Power supply 40 W
Size 520 * 500 * 20 (MM)


highway emergency dispatching system solution

highway emergency dispatching system solution

Description Characteristic
System Voltage 12V
Max Load current 10A
Dimensions 82 x 58 x 20mm(w x hx d)
Self consumption 10mA
Final Charge Voltage 13.8V
Type of protection IP68

System standby: 32 Hours after full charged

System Audio mode time: 17 hours after full charged.

   EM21 Main unit VoIP telephone Specifications :

VoIP SIP2.0 telephone        DTMF dialing                                   Audio Codes:G.711, G.723,G.726, G.729

MTBF:100000hours           MTTR: 2 hours                                 Network:10/100 BaseTX Ethernet, RJ45

Hot-line (maximum length of each number is 16 digits)         connectors, Cat5e or better 

Communication: Full duplex 2-way hands-free                        IP Protocols:IPv4, TCP, UDP, RTP, DHCP, SIP

 communication                                                                         1 x LAN Protocols:Power over

Call Control Signaling:VOIP SIP Info(DTMF), RFC                  Ethernet(PoE,802.3af),

2833(DTMF)                                                                              1x LAN(IEEE 802.3af), Network Access

Power:Power over Ethernet, IEEE802.3af, Class 0                  Control(IEEE 802.1x),STP(IEEE 802.1d),

Local power, 12VDc,Idle 2W, Max 10W                                  RSTP(IEEE 802.1d-2004)

Auxiliary Contacts: (option)                                                     Programming:Non-volatile flash memory

1 Aux Output, dry contact                                                       programming and configuration through Web GUI 

Contact Ratings. Load: Resistive load                                    Management and Operation:DHCP and static IP,

Rated load:0.3 A at 125 VAC; 1 A at 30 VDC                         remote automatic software upgrade, centralized

Rated carry current:1A                                                           monitoring. 

Max.switching voltage:125 VAC,30VDC                                Echo cancellation code:G.167/G.168   

System topology

 highway emergency dispatching system solution

Operator console center

highway emergency dispatching system solution

IP PBX Server 

highway emergency dispatching system solution

highway emergency dispatching system solution


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