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Fiber Optical Monitoring Alarm System (FOMA)

                             Fiber Optical Monitoring Alarm System (FOMA)

FOMA (Fiber Optical Monitoring Alarm System) is integrated RTU (Remote Test Unit) 、Center Monitoring Server and its management software to achieve integrated operation、remote management、unattended monitor、periodic fiber scan、predictive analysis and support the instant fiber with status information and alarm warning, accurate of long-term fiber data record



Download PDF file for FOMA Specifications 



Application features

  • This FOMA hardware is mutual related with its slotted devices and connected with its plug-in cards. The expansion type with its maintenance type is promoted greatly and protect client to the system investment effectively.
  • Guarantee to minimum the system conflict, keep the system stability and maintenance with integrity and unified, so that the maintenance cost is significantly reduced.
  • With 20 years OTDR professional production experience and design on demand in the system concept, we support client to streamline and increase the device at the  convenience
  • Support the rigorous privilege function to manage the remote control and data transfer functions.
  • The remote user-friendly graphical display as monitoring user interface in LAN and WAN.
  • The embedded Linux system: with its high security system to avoid the virus invasion crisis.
  • With remote control the embedded image: to monitor data center operation and maintain equipment as well as training from the remote site.
  • Highly integrated structure design, which is easily to install and maintenance as well as easy operation.


On-Line Monitoring

Combine test wavelength and operating wavelength in a fiber via WDM device. Use filter to filter out the test wavelength and let the operating wavelength pass. On line monitoring is to put a splitter in the route and separate 3~5% of the light to get the data.

On line monitoring diagram is as below               


Off-Line Monitoring

Use the backup fiber. The fiber network system is easily to set up and maintain. Test wavelength can be the same with operating wavelength.

Off line monitoring diagram is as below             


Features Overview

  • Active maintenence:In the normal operation of the communication system, we shall perform early warning function, detect obstacles in timely maintenance, and change from passive to active maintenance. The fiber optic cable can be timely maintained to increase customer confidence.
  • Pre-alarm:Maintain the less quality of the optical attenuation earlier to prevent cable disconnection, reducing customer repair requests, avoid to impact the reputation. The earlier problem solving, the less maintenance cost.
  • Long-term monitoring:From long-term record of the alarm cable, attenuation, communication of status, you can detect the quality of optical cable construction. This will help maintenance and construction employees to promote the technical quality.
  • Centralized network architecture structureReduce unnecessary costs and no need to build multiple monitoring data center. There is no multi-center data backup issues that can be reduced the problem of database synchronization.

Hardware features

  • Precise mapping of OTDR optical test events with receiving its test curve data.
  • With OCS module to select one of the optical paths to make the multiple fibers test function come true.
  • OPM module can collect and return the optical data.
  • Collect and return the equipment status.
  • Support the network remote control and data transfer functions.
  • Remote control to start the electric power mechanism.
  • Support the cable breakage analysis、fault cause analysis、QoS management and reporting system management
  • Network Laser Source(NLS)

Software features

 • Route monitoring function

 • Protocol management function

 • Data analysis function

 • RTU management function

 With 20 years professional experience and " Design-On-Demand " ideal philosophy, we can high-speed to offer customized software based on customer demand


FOMA Software Management Function Overview                       

  Specified Test

  Specified the remote optical fiber to be tested completely and receive the  test  results, you

  can keep the  transmission characteristics of optical fiber.


  Periodic Test

  Through the pre-test cycle to complete the test and store the analysis of data, according

   to the    implementation result to proceed  the appropriate process accordingly.   


  Alarm Test

  With the collection of Optical power or other alarm information to receive fiber optical alarm

  message, and follow to trigger the system automatically to complete the testing, analysis, 

                         alarm and other functions.


  Optical Power Alarm

  Real-time monitor to learn the loss changes in fiber optical cable and search the hidden

  failures to prevent the disability. 


  Data center management

  Data Center can manage multi-FOMA systems in varied stations through TCP/IP.



  FOMA system operation

  FOMA system can be monitored 4 to 32 routers (depends on number of OCS Optical Channels 

  Switchand number of ports OPM Optical Power Meter) . The OTDR monitoring fiber optical module 

of its dynamic range can support the maximum up to 50 ~ 180 km, if more than this range, be increased in another

region of a FOMA monitoring machine.

RTU Specification 

RTU monitoring station is formed by embedded micro processor module (MCU), OTDR module, Optical Power Measurement module (OPM), Optical Channel Switch module (OCS), Power module (POWER), Wavelength division multiplexing module (WDM) (option).

          MCU  ( Microcontroller Unit  module)  specification         


The function of MCU module is to manage other devices and communicate with the monitoring center server. It can transmit the status of monitoring station to the monitoring center, or perform configuration and operating instructions from monitoring centers. Using embedded control systems, structures refined.

  • Processor: ARM9,200MHz and above
  • Dynamic RAM: 64MBytes and above
  • Storage interface: SD card 2G Bytes and above
  • Including RS-232C and USB external port
  • With Watch Dog to monitor the system operation
  • The Linux system with its high security operation to avoid the virus invasion crisis. 

Power (Power module) specification


Power module is an Intelligent Power. While Traditional power supply designs use analog ICs with fixed functionality to provide regulated power, the Intelligent Power Supply integrates a MCU for following power featuresDigital On/Off control for low standby power, remote communications function feedback the power status, Power supply sequencing and hot-swap control, with light indication and power switch on the panel.

  • Input two kinds of voltage with 48VDC and 90~240VAC, the electricity power for each module is output: +5VDC power supply
  • The location for AC and DC is located at the backplane of the chassis
  • With light indication and power switch on the panel

 OTDR  (Optical Time Domain Reflectometer) specification           

OTDR test device is work with OCS device to find fiver cable fault location OTDR can test and analysis the change of the optical path periodically according the parameter.

  • Operation wavelength :1310/1550/1625nm
  • Dynamic range @ NR=1,Pulse=20 us : 30dB~45dB 
  • X-axis resolution : 25 cm
  • Y-axis resolution : 0.01dB
  • Refraction index :Between 1.4000 and 1.7000   range,each layer is 0.0001
  • Accuracy:±(1m + 3 x10-5 x Distance +Marker Resolution )
  • Attenuation Dead Zone @ 0.01 msec and below:≦ 9 m
  • Event dead zone @ 0.01 msec and below :≦ 3 m
  • Pulse width:at least support 8 pulse width:10 ns /30ns/100ns/300ns/1us/3us/10 us/20 us
  • Maximum Sampling points:More than 128,000 points
  • USB interface  port (to connect with IPC) 

OCS ( channel selection module) specification 

OCS is the abbreviation of optical switch. OCS is a kind of tool with one or more optional transmitting ports. Its role is to switch or logically operate optical transmission line and the congregation of optical signal, simply means that you can use a optical fiber which is connected to a port and use it to connect to more ports by OCS switch.

  • Channel number: 2/4/8/12/16/24/32/48 ports
  • Passband: ±15nm@ 1310nm, ±20nm@ 1550nm and 1625nm
  • Back Reflection: > 55dB
  • Insertion loss: ≦1.0dB
  • Switching time: ≦75ms
  • Crosstalk: > 70dB
  • Repeatability, in the room temperature after operation for 1 hr:≦ 0.1dB
  • Life time: able to switch 10 million cycle min
  • RS-485 port ( connect to AIM)

OPM (Optical Power Measurement module )  specification

An optical power meter (OPM) is a device used to measure the power in an optical signal. The term usually refers to a device for testing average power in fiber optic systems. A typical optical power meter consists of a calibrated sensor, measuring amplifier and display

  • Operation wavelength : 1310nm‚ 1550nm and 1625nm three segments
  • Dynamic range‚ input optical power : -2.2 dBm ~ -65 dBm
  • Accuracy:≦ 0.5 dB
  • Resolution:≦0.1dB
  • Linearity, between -10 and -55 dBm: ≦± 0.5 dB
  • Output ports: 2/4/8/12/16/24/32 ports to select
  • Build-in LP optical filter
  • RS-485 port ( connect to AIM) 

GSM Server (Message system for mobile )  specification

Support multi languageOne- to- many messages deliveryTCP/IP interface for secondary development ( HTTP web development interface is optional )

  • Processor: ARM7
  • Operation System:uClinux 
  • Communication Network:10/100Mb
  • Power:+/- DC 48V (standard), DV 24V or DC 12V is optional 

Video (Video module) specification

Data center can work to remote equipment for maintenance and education

  • Channel1 / 2 / 4 / 8 port
  • Image output : 30 fps real time ( 1,2,4 port) , 15 fps ( 8 port)
  • Image Compression Format : Motion-JPEG, VGA
  • Output Format : NTSC/PAL
  • Support Video recording, Snapshot, image ftp , SMS & Email

NLSU (Network Laser Source Unit) specification

NLS Network controlled Stabilized Laser Source is a mounted laser source of remote control by network capabilities and embedded 2/4/6/8 ports laser source; in any combination with 1310/1490/1550/1625 nm to better suit your application. With CGI (Common Gateway Interface)or API(Application Programming Interface) command, each pair of laser  source(1/2,3/4,5/6,7/8)can be turn on/ off with remote control independently. It is ideal for offline optical power output testing of Fiber Optical Monitoring Alarm system.

Technical Specification  



Laser Type

FP Laser, Class






Spectral Width


Output Ports

2 or 4 or 6 or 8

Output Power

-3.0dBm   or   -7.0dBm

Stability in 8Hr



0 ~ 505 to 95%RH(non-condensing)


-10 ~ 705 to 95%RH(non-condensing)

Optical Connector

FC or SC (PC)


 Channel number2/4/8/12/16/24/32/48 por



Specification Requirement

Operating System Requirement

Operating system

Windows 2003 Server Enterprise edition

Software Requirement


SQL Server 2008 Enterprise edition (EN version)

Windows module

IE Browser 7.0 and above

IIS Internet Information Services module

.NET Framework SDK 3.5 and above

Server Specification



Suggested 4 GHz or above


Minimum  2 GB RAM

Suggested  4 GB RAM or above

Hard disk

Minimum 250 GB

Suggested    1 TB or above



Display device

Support Super VGA1024 × 768or above


Keyboard and Microsoft mouse or or compatible pointing device

Regular specification


285 (L) x 483 (W) x 265 (H) mm



Operation temperature

Operation temperature: 0 to +50

Storing temperature:-10 to +70

Operation humidity

0 to 90 %