VCL-2710, IEEE C37.94, Multi-Mode to Single Mode Optical Converter


The VCL-2710, IEEE C37.94 Multi-Mode to Single-Mode Optical Converter is a ruggedized, sub-station-hardened converter that converts IEEE C37.94 Multi-Mode signal to Optical Single-Mode Optical signal. The equipment is designed to extend IEEE C37.94 multi-mode signals over extended single-mode optical fiber spans. The VCL-2710, IEEE C37.94 Multi-Mode to Single-Mode Optical Converter includes the clock synchronization and clock re-generation functions which allows it to transmit the IEEE C37.94 multi-mode signal over very long single-mode optical fiber links of up to 50dB optical link loss budget (i.e. typical reach of 167 Miles / 270 Kms).

IEEE C37.94 Multi-Mode to Single Mode Optical Converter

DIN Rail Mount Version

IEEE C37.94 Multi-Mode to Single Mode Optical Converter

1U high, standard 19-inch Rack Mount Version

VCL-2710 is designed for use in point-to-point applications. The VCL-2710 meets and complies with the IEC-61850-3, EMI, EMC, Surge and Temperature specifications making it suitable for sub-station installations to provide uninterrupted service even in the most demanding and harsh environments.

VCL-2710 is available in DIN Rail mount version and 1U high, standard 19-inch rack mount version.

Features & Highlights:

  • Complies to IEEE C37.94 protocol
  • Power Budget 13dB to 50dB in Single Mode
  • Single and 1+1 redundant power supply option

The most common application of the VCL-2710 is to allow the user to transmit the existing IEEE C37.94 multi-mode interface over a single-mode optical fiber link without the need to install any additional multiplexers or transmission equipment, which would otherwise be required to inter-connect the IEEE C37.94 Relays between near-end and the far-end substations.


Power Terminal Block, 2-PIN Supply Connector
IEEE C37.94 Interface ST Connector
Optical Interface SFP Module
External Alarm Terminal Block, 3-PIN Connector


  • DIN Rail Mounting.
  • 1U high, 19-inch Rack Mounting

Power supply

  • 48V DC (18V to 60V DC)
  • 110V DC, 220V DC, 100~240V AC
  • Redundant 1+1 power supply option available in 19-inch Rack Mount Version

C37.94 Interface Specifications

Number of interfaces per card 1 Tx, 1 Rx
Standards IEEE C37.94
Optical 820nm / 850nm Multi-Mode
Optical Connector ST
Optical Transmitter LED

Optical Interface Specifications

Optical Module Type SFP
Connector LC
Fiber Single-mode 1310 nm, 1550 nm
Distance ≤ 15 KM, ≤ 40 KM, ≤ 80 KM, ≤ 160 KM, ≤ 180 KM, ≤ 200 KM, ≤ 260 KM, ≤ 270 KM (typical reach) Type Laser
Type Laser

CE Compliance

  • Low Voltage Directive 2014/35/EU
  • Electromagnetic Compatibility 2014/30/EU

Other Regulatory Compliances:

  • RoHS
  • CE Marking
  • Complies with FCC Part 68 and EMC FCC Part 15
  • Telcordia GR-1089 Surge and Power Contact

Electromagnetic Standards Compliance:

  • EN 50081-2,
  • EN 50082-2
  • IEC 61000-6-2 (Immunity)
  • IEC 610000-6-4 (Emission)
  • Complies to IEEE and IEC standards


  • Per MIL-HDBK-217F: ≥ 37 years @ 24C
  • Per Telcordia SSR 332, Issue 1: ≥ 42 years @ 24C


Application: VCL-2710, C37.94 to Optical Converter

IEEE C37.94 Multi-Mode to Single Mode Optical Converter


Question 1: What is the latency across the VCL-2710 unit in ms, i.e., from the IEEE C37.94 input to the SFP output.
Answer: Less than 125 microseconds (i.e. 0.125 ms).

Question 2: What is the end-to-end transmission time in ms, i.e., the total time on the IEEE C37.94 interface on one unit, across the SMF link, and out the C37.94 interface on the other. (assuming a distance of 40Km / 25 Miles between the units).
Answer: The end-to-end time transmission time is less than 250 microseconds (i.e. 0.250 ms), assuming an optical span of 40KM / 25 Miles.

Question 3: What is the variation (jitter/wander) on the latency, e.g., +/- 125us
Answer: The unit boasts of a very precise clock recovery and jitter attenuation circuitry that makes it extremely suitable for very long optical spans. The output jitter is less than 0.05UI peak-to-peak (which is similar to DS1, TDM transmission equipment). The jitter and wander tolerance meets and exceeds the ITU Rec. G.823 specifications.

Question 4: In regards to the 48V DC supply, is your power supply negative ground, positive ground or free-floating? And does your power supply support the same environmental ratings as the VCL-2710?
Answer: It is a free-floating power supply and the 48V DC version of the equipment works over the range from 18V DC to 72V DC. It can work on 24V DC and 48V DC power inputs without requiring any modifications. The power input is protected against reverse polarity and the equipment is not damaged if the power input is connected backwards, in the reverse polarity. The equipment shall work only once you correct the input power polarity.