Sycamore Networks

IEEE C37.94 Optical Modules

Improve Safety and Reliability of Intra-Substation Data Links

Low Speed (IEEE C37.94) Optical Modules

  • 1-port and 4-port modules, both IEEE C37.94-compliant
  • Hot-swappable
  • One tri-color LED indicates status of each C37.94 port
    • Green – SYNC
    • Red – UNSYNC/LOS
    • Yellow – Yellow Alarm
    • Flashing Yellow – Loopback

Optical Characteristics

  • Optical Fiber
    • Multi-mode
    • 62.5 μm core diameter optical cable
    • 50 μm core diameter optical cable
  • Optical Source: LED
  • Optical Budget
    • 9.6 db at 50 μm of core size
    • 15 db at 62.5 μm of core size
  • Connector: One pair of Tx/Rx ST-connectors per port
  • Typical transmission distance: Maximum 2 km
  • The center emission wavelength: 820 nm +/- 25 nm

Operating Modes

  • Auto: System detects both Rx and Tx bandwidth by examining the content of the payload
  • Manual: User-configurable Tx bandwidth

Test Patterns

  • 2exp20-1 (QRSS)

Loopback Capabilities

  • Line, Local, Payload

Communication Failure Scenarios

  • LOS: Declared within 1 ms after receiving 2 or more errors in 8 consecutive framing patterns; cleared after receiving 8 consecutive correct framing patterns
  • Yellow: Declared when 3 consecutive received frames have the “Yellow” bit set and there is no LOS; cleared after 3 consecutive received frames have the “Yellow” bit cleared or the LOS is present
  • Framing and Payload Errors

Clocking Criteria

  • Teleprotection equipment should use the signal from the multiplexer for clocking
  • The multiplexer should not use the signal from the teleprotection equipment for clocking

Management

  • Local access via RS232 serial interface
  • Remote access via SNMP MIB and Node Viewer

Fault Management

  • Support for TRAP PDUs
  • Events and TRAPs generated for Port Alarm, Module Insertion/Removal, and Module Failure indications

Alarms

  • Configurable levels (Critical, Major, Minor, Disable) for LOS, and YEL
  • Alarms triggered based on error level thresholds set up for the ES, SES, and UAS

Performance Reports

  • 1 hour, 24 hour, and 7-day intervals available
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