C37.94: IEEE Standard for N times 64 kbps Optical Fiber Interfaces between Teleprotection and Multiplexer Equipment
C37.94 is the most commonly used interface between multiplexer and distance and differential protection devices. DNWP Connection Master supports two variants of C37.94 interface units with different optical interfaces and transmission modes over MPLS-TP, SDH and PDH.
This page provides an overview of the supported C37.94 interface options, transmission modes, and technical specifications of the Connection Master platform.
OTP 4 channel plug-in unit for multimode fiber and ST connectors
OTPS 4 channel plug-in unit for SFP transceivers with LC connectors.
Technical data table
| OTP | OTP-SFP | |
|---|---|---|
| Order code | T32004.11 | T32004.12 |
| Channels per unit | 4 | 4 |
| Connector | ST | LC |
| Fiber type | MMF | MMF or SMF |
| Wavelength | 850 nm | 850 or 1310 nm |
| Maximum distance | 2 km | 10 km |
| Transmission mode | Time slot | Direct / Time slot |
| Transceiver Digital diagnostics |
No | Yes |
C37.94 transport modes
| Direct mode, SDH | Transparent C37.94 communication over SDH VC-12 channels, for lowest transmission delay |
|---|---|
| Direct mode, MPLS-TP | Transparent C37.94 communication over MPLS-TP networks using SAToP (Structure-Agnostic TDM over Packet) with integrated MPLS-TP OAM function |
| Time slot mode, MPLS-TP/SDH/PDH |
DS0 64kbps cross connected C37.94 channels for data rates 64-768 kbps. DS0 connected data can be transported over MPLS-TP, SDH or PDH networks |
Connection Master brochure 2025 (English)