Emergency call box system over optical fiber

The emergency call system over optical fiber transmission allows voice and control data communications between the roadside emergency call boxes and the Control Center where the emegency calls are received and the whole system is managed. Musatel offers solutions for different types of configurations, depending on the transport network between the emergency call boxes set and the Control Center.

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Configuration 1: transport network is SDH.

Emergency call box system over optical fiber SDH transport network

Transport of voice and data between the optical header equipment and the Control Center is made over SDH. The equipments involved in this configuration are:
Roadside:
• A set of call boxes distributed along a road or tunnel.
• Optical header equipment (ECL) to which the call boxes are connected. This equipment adapts the optical-electrical interfaces and also performs automatic calibration of the optical power transmitted by the call boxes.

Located at the Control Center:
• Communication front-end interface (FEI RS232 and audio)
• Management software for emergency call attention and supervision handled by an operator.

Configuration 2: transport network is IP

Emergency call box system over optical fiber with IP transport network

In this configuration the Optical Front End Interface(FEI) IP acts as a optical header equipment that is directly connected to the optical fiber of the emergency call boxes in one side and to the Control Center in the other side (over an IP transport network). Voice and data transport between FEI and Control Center is done over an IP network using standard protocols TCP/IP, UDP/IP y voice over IP. Control Center software for this configuration is Musatel SOS. Allocation of the Control Center that handles the emergency call network is done dinamically by means of a message sent to the FEI from the Control Center software.
The equipments involved in this configuration are:
Roadside:
• A set of call boxes distributed along a road or tunnel.
• Optical FEI IP equipment.
Located at the Control Center:
• Musatel SOS Management Software for emergency call attention and supervision handled by an operator.

Configuration 3: IP transport network, Control Center software does not handle IP header

Emergency call box system over optical fiber with IP transport network and IP- RS232 audio converter This configuration is used if the Control Center software does not implement the Optical FEI IP communication protocol. The adapter equipment that must be installed in the Control Center provides RS232 connection and audio managed by a conventional FEI.
The equipments involved in this configuration are:
Roadside:
• A set of call boxes distributed along a road or tunnel.
• Optical FEI IP equipment.
Located at the Control Center:
• Optical FEI IP-CC converter.
• Management software for emergency call attention and supervision handled by an operator.

Configuration 4: Optical header equipment is located at the Control Center

Emergency call box system over optical fiber with optical header located at the Control Center

In this configuration the management of the emergency call boxes is performed at the optical header location.
The equipments involved in this configuration are:
Roadside:
• A set of call boxes distributed along a road or tunnel.
Located at the Control Center:
• Optical FEI RS232 and audio.
• Management software for emergency call attention and supervision handled by an operator.

Following configuration is used if the optical header is located at the Control Center and the communication between the header equipment and the Emergency call management computer must be done over IP:

Emergency call box system over optical fiber with optical header located at the Control Center

The equipments involved in this configuration are:
Roadside:
• A set of call boxes distributed along a road or tunnel.
Located at the Control Center:
• Optical FEI IP equipment.
• Musatel SOS Management Software for emergency call attention and supervision handled by an operator.

How to increase the number of call boxes connected to an optical header

The number of call boxes that can be connected to an optical header equipment (ECL) is set by the optical signal attenuation due to fiber coupling losses in each splitter and the optical fiber attenuation. The Optical Repeater equipment regenerates the optical signal so that an increased number of call boxes can be connected to the same optical header.

Emergency call box system over optical fiber with optical repeater

Required equipment: Optical repeater.

Emergency call optical fiber solutions

Optical fiber call box electronic board

Handles a master call box and a slave call box. Functionalities: user and maintenance call, call box testing under request , automatic alarm notification and low power consumption. Consumption : 2,5 mA idle state and 180 mA in call state.Temperature range: –25 to 70º C.

Optical header equipment (ECL)

Performs adaptation of optical-electrical interfaces and automatic calibration of the optical power transmitted by the call boxes. The ECL equipment is an electronic board mounted on 19´´ rack with a 220 Vac power supply. External ports:

• 2Mbits port for Front-end equipment coonection: digital electrical signal, full-duplex, bit rate 2048 kBits/s., ITU-T rec.G704 frame. 2xBNC Connector, coaxial cable.
• Connection port for the optical line from the call boxes: single-mode fiber cable, full-duplex , bit rate 4096 Kbits/s. 2xFC/SPC Connector, ITU-T Rec. G.704 frame.

FEI RS232 and audio

FEI RS232 and audio is an electronic board mounted on 19´´ rack with a 220 Vac power supply. External ports:
• Port for optical header equipment(ECL) coonection: digital electrical signal, full-duplex, bit rate 2048 kBits/s., ITU-T rec.G704 frame. 2xBNC Connector, coaxial cable.
• Port for connnection with management system: RS232 port.
• Port for 4-wire handset for voice communication with the call boxes.

Optical FEI RS232 and audio

Optical FEI RS232 and audio is an electronic board mounted on 19´´ rack with a 220 Vac power supply. External ports:
• Connection port for the optical line from the call boxes: single-mode fiber cable, full-duplex , bit rate 4096 Kbits/s. 2xFC/SPC Connector, ITU-T Rec. G.704 frame.
• Port for connnection with management system: RS232 port.
• Port for 4-wire handset for voice communication with the call boxes.

Optical FEI IP

Optical FEI IP is an electronic board mounted on 19´´ rack with a 220 Vac power supply. External ports:
• Ethernet 10BASE-T , RJ-45 connector.
• Serial port for configuration and maintenance.
• Connection port for the optical line from the call boxes: single-mode fiber cable, full-duplex , bit rate 4096 Kbits/s. 2xFC/SPC Connector, ITU-T Rec. G.704 frame.

Optical FEI IP-CC converter

Provides audio and RS232 connections for a FEI RS232 and audio acting in the Control Center as a converter for the Optical FEI IP. External ports:
• Ethernet 10BASE-T , RJ-45 connector.
• Serial port for configuration and maintenance.
• Port for connnection with management system: RS232 port.
• Port for 4-wire handset for voice communication with the call boxes.

Optical Repeater

The Optical Repeater equipment increases the number of call boxes that can be connected to the same header. Optical Repeater includes the following functionalities:
• Regenerates the optical signal between the call boxes network and the optical header.
• Controls the expanded network of call boxes acting as an optical header.
• Calibration of the optical power transmitted by the call boxes
• Calibration of the optical power transmitted by the repeater according to the adjustments received from the optical header.
Optical Repeater is an electronic board mounted on 19´´ rack with a 220 Vac power supply. External ports:
• Single-mode fiber cable, full-duplex , bit rate 4096 Kbits/s. 2xFC/SPC Connector, ITU-T Rec. G.704 frame.