These systems can perform in-situ monitoring of many optical parameters of over 200 channels simultaneously. In addition to testing, MET offers compliance consulting and test plan development.


Testing includes:

  • Product geometry
  • Cross-sectioning
  • Geometric tolerances
  • Mechanical testing (vibration, shock, etc.)
  • Fiber integrity (tensile loading, fiber flex and twist testing)
  • Environmental simulation (thermal cycling, thermal shock, life aging)
  • Airborne contaminants
  • Salt spray
  • Fungus resistance testing
  • FIT rate assessment
  • Digital optical component testing (BERT, eye diagram, etc.)



Following are the relevant fiber telecom standards MET tests to:

  • GR-13-CORE Pedestal Terminal Closure
  • GR-20-CORE Optical Fiber and Optical Fiber Cable
  • GR-196-CORE Optical Time Domain Reflectometer (OTDR) – Type Equipment
  • GR-253-CORE Synchronous Optical Network (SONET) Transport Systems
  • GR-326-CORE Singlemode Optical Connectors and Jumper Assemblies
  • GR-409-CORE Premises Fiber Optic Cable
  • GR-449-CORE Fiber Distributing Frames
  • GR-468-CORE Optoelectronic Devices Used in Telecommunications Equipment
  • GR-487-CORE Electronic Equipment Cabinets
  • GR-765-CORE Single Fiber Single Mode Optical Splices and Splicing Systems
  • GR-771-CORE Fiber Optic Splice Closures
  • GR-902-CORE Handholes and Other Below-Ground, Non-Concrete Splice Vaults
  • GR-910-CORE Fiber Optic Attenuators
  • GR-949-CORE Service Terminal Closures Used with Optical Cables
  • GR-950-CORE Optical Network Unit (ONU) Closures
  • GR-1073-CORE Singlemode Fiber Optic Switches
  • GR-1081-CORE Field-Mountable Optical Fiber Connectors
  • GR-1095-CORE Multi-Fiber Splicing Systems for Single-Mode Optical Fibers
  • GR-1209-CORE Fiber Optic Branching Components
  • GR-1222-CORE Fiber Optic Terminators
  • GR-1295-CORE Remote Fiber Testing Systems (RFTSS)
  • GR-1380-CORE Fusion Splice Protectors
  • GR-1435-CORE Multi–Fiber Connectors
  • GR-2853-CORE AM/Digital Video Laser Transmitters and Receivers
  • GR-2854-CORE Fiber Optic Dispersion Compensators
  • GR-2876-CORE Universal Test Sets (UTS)
  • GR-2883-CORE Fiber Optic Filters
  • GR-2898-CORE Fiber Demarcation Boxes
  • GR-2919-CORE Hybrid Splice/Connector for Single-Mode Optical Fiber
  • GR-3125-CORE Outdoor Fiber Distribution Hub (FDH) Closures
  • GR-3126-CORE Generic Requirements for Wall Plates, Moldings, and Raceways that Support Fiber Optic Services

SONET Testing

MET Laboratories is fully capable of testing to Fiber Optic design standards such as GR-253-CORE for SONET equipment as well as its equivalent international standards for SDH equipment.

Testing of SONET/SDH equipment involves a variety of areas, such as:

  • Network Compatibility and verification of Network Interface design
  • Verification of STS-n/STM-n frame structure, Synchronous Payload Envelope/Administrative Unit
  • Timing and Synchronization
  • Jitter and Wander Testing

Physical Parameter Testing involves:

  • Transmitter Characteristics, including Operating Wavelength Range, Extinction Ratio, Side-Mode Suppression Ratio, Eye Diagram Mask and Spectral Characteristics
  • Receiver Characteristics, including Receiver Sensitivity, Overload and Reflectance
  • Characteristics
  • Pointer Adjustment
  • Automatic Protection Switching (APS) Testing
  • Tandem Connection Monitoring (TCM)

The general list of international standards for SDH Equipment is as follows:

  • ITU-T G.703
  • ITU-T G.707
  • ITU-T G.783
  • ITU-T G.957
  • ITU-T G.958

There are various other standards that could apply depending on the function of the Optical Product to be tested. Countries like Brazil, Japan, Switzerland, Poland, and Singapore have their own standards for SDH-type equipment.

MET is able to test against these standards as well as vendor-driven requirements. Our GR-253-CORE testing capability, coupled with our existing capability to test fiber optic components to GR-326-CORE, GR-910-CORE, GR-1073-CORE, GR-1209-CORE and GR-1221-CORE allows MET to satisfy all testing aspects of your Optical Product.

Additionally, MET offers protocol analysis/system level testing to:

  • EC1 (SONET)
  • EC3 (SONET)/STM-1E (SDH)
  • OC1(SONET)
  • OC3 (SONET)/STM-1 (SDH)
  • OC12 (SONET)/STM-4 (SDH)
  • OC48 (SONET)/STM-16 (SDH)
  • OC192 (SONET)/STM-64 (SDH)