Telegra

Emergency Roadside Telephone

ERT Central control station

EMERGENCY ROADSIDE TELEPHONE SYSTEM

· Roadside and tunnel version
· Low cost of ownership over extended lifetime
· Simple to operate and maintain
· Solar powering enabled by low power consumption
· VoIP and GSM execution, optionally
· topXviewTM like ergonomic GUI
· wireless comunication module now available

Emergency Call System is a communication system which provides drivers on roads/highways/tunnels with an ability to call and communicate with a highway attendance staff.
Emergency Roadside Telephone System consists of two parts – central unit, usually located in Operations and maintenance center (OMC) and roadside pillars or tunnel call units, located alongside the road or in tunnels in niches or directly on the tunnel walls.

Emergency roadside telephone (ERT) Central Unit is the heart of the ERT system. It represents an interface between ERT pillars or tunnel call units, handling desk or PC based system and public (PSTN or VoIP) telephone network.

Versatility and modular design of Telegra’s ERT system allows users to configure according to their needs. Fully digital architecture and DSP audio processing provide
for superior sound quality.

Two types of ERT pillars can be connected to ERT Central Unit:
· Roadside ERT pillars connected through single mode optical fiber*/**
· Tunnel ERT call units connected through single mode optical fiber*/**

There are two types of user interface available for ERT Central control station
· standalone handling desk,
· PC software (delivered with speakers and pre–amplified microphone).

Using single mode fiber optic based system system can be extended up to 160 km. Fiber optic line roadside pillars or tunnel call units are connected through the line modules – maximum of 32 ERT pillars/call units can be connected to single line module.

*Roadside pillars and tunnel units with copper cable based communication are available upon request and it is possible to mix copper and fiber optic cable based systems.
**Custom designed pillars and GSM/Cellular system or VoIP based communication systems are available on the request.
ERT Central unit

ERT Central Unit Features:
• Connection of up to 32 pillars to one interface card, and possibility to use up to 16 units int the single system
• Separate controller for each CU to provide better reliability
• Freely defined number of PSTN or VoIP interfeces to the public telephone network
• Interface to PC trough RS–232 interface or Ethernet connection
• Interface for audio recording equipment
• Periodical auto testing of pillars, status monitoring and notification of any errors

Roadside pillar communication unit

Emergency Roadside Telephone (ERT) pillar is a communication device providing signaling and full duplex digital audio transmission in redundant configuration utilizing only two fibers. Its reliability and endurance guarantee full functionality in the harshest of environments.It is ergonomically designed, very easy to use (only one big pushbutton), highly visible and easy to spot. Solar powered fiber optic ERT pillar in conjunction with battery backup allows operation without remote powering and therefore extends ERT system reach up to 160 km.

Communication with central control station is serial by means of SM fiber optic cables.

Two ERT pillars are connected to one communication unit, one on each side of the road. Pillar communication units are connected in series, forming two redundant full duplex serial loops with central control station, making system insensitive to the first failure in any communication line. Maximum of 16 communication units (32 pillars) can be connected in single optical communication line.

· Copper cable based and GSM radio based versions are also available upon request.

Wireless master/slave communication between two ERT pillars
Within one fiber-optic ring there is up to 16 electronic modules which connect pillars to fiber-optics. 16 controllers with 32 pillars mean that two pillars share one electronic module. One of the two pillars is referred to as master and the other one is referred to as slave. Electronic module is located inside the master pillar and connected to the main SM optical cable. Slave pillar connects and communicates to its master via wireless radio link. Wireless communication module (located in both pillars) acts as a replacement for cable between master and slave pillar and transfers both audio and data between the slave and master pillar.
At the time, only one pillar may have active audio conversation with the central unit. However, the other pillars within ring are still able to send individual calls (conversation requests) to the central units. Central unit receives those calls and via Ethernet network sends them to the traffic control center. All pending call are logged at the PC workstation and put on queue. An operator at the traffic control center can switch between pending calls, or terminate current call and accept the next one on queue.

DC electrical specifications:

Parameter	Sym	Min.	Typ	Max.	Unit
Operating Temperature range	to	-30		+70	°C
Supply voltage	Vss	10		25	VDC
Supply current (stand by) @12V	Ics	4		8	mA
Supply current (active) @12V		30		70	mA
Duration of operation, fully charged battery without recharging	Top	480			hours (with 24Ah battery)

Mechanical specifications:

H x W x L :	1625 x 416 x 520 mm (without solar panel)
Pushbutton type:	PIEZO, hermetically sealed
Weight:	53 kg (pillar)

Mechanical specifications regular version:

H x W x L :	300 x 160 x 210 mm
Pushbutton type:	mechanical
Weight:	4 kg

Mechanical specifications version with noise supression:

H x W x L :	450 x 450 x 130 mm
Pushbutton type:	mechanical
Weight:	5,5 kg

Tunnel call unit

Tunnel version of the Emergency Roadside Telephone (ERT) is a communication device providing signaling and full duplex digital audio transmission in redundant configuration utilizing only two fibers. Its reliability and endurance guarantee full functionality in the harshest of environments. It is ergonomically designed, very easy to use (only one big pushbutton), highly visible and easy to spot. By using the single mode fiber as a communication medium, the ERT system operating range extends up to160 km.
Communication with central control station is serial by means of SM fiber optic cables. Two ERT call units are connected to one communication unit, one on each side of the tunnel. Communication units are connected in series, forming two redundant full duplex serial loops with central control station which makes system insensitive to the first failure in any communication line. Maximum of 16 communication units (32 pillars) can be connected in single optical telecommunication line version for direct deployment in tunnel tube – with high speaker power and roadside noise cancellation is also available.

Optical specifications: Cable type: 9/125 single mode - No of fibers: 2 - Connector type: ST, or user selectable

Parameter	Sym	Min.	Typ	Max	Unit
Coupled optical power, single mode	Popt		0.4		mW
Optical budget	Arec	17			dB
Link distance	Dlmin	20			km

Audio specifications:

Parameter	Sym	Min	Type	Max	Unit
Frequency response (-3dB)	fo	300		3200	Hz
Audio encoding			12		bits, PCM
Sampling frequency	fs		7,2		kHz
Speaker audio output power	Pout	2			W

Certificates and Third Party (Independent Laboratory) Test Results

· General Requirements – Information technology equipment – Safety in accordance with IEC 60950–1
· EMC testing in accordance to:
ERT unit meets electro–magnetic interference immunity levels as defined in EN 50293:2000:
· EN 55022: Terminal disturbance voltage, Class B
· EN 55022: Radiated emissions, Class B
· EN 61000–3–2: Limits for harmonic current emissions, Class A
· EN 61000–3–3: Limitation and voltage fluctuations and flicker low voltage supply system
· EN 61000–4–2: Immunity to electrostatic discharge, failure criteria: B
· EN 61000–4–3: Immunity to radiated electromagnetic fields, failure criteria: A
· EN 61000–4–4: Immunity to fast transients (Burst), failure criteria: B
· EN 61000–4–5: Immunity to surges, failure criteria: B
· EN 61000–4–6: Immunity to conducted high frequency interference, failure criteria: A
· EN 61000–4–11: Immunity to voltage drops, short interruptions and voltage variations