Overview
ISO/IEC TR 29125:2010 - Information technology - Telecommunications cabling requirements for remote powering of terminal equipment - is a Type 2 Technical Report published by ISO/IEC JTC 1. It provides guidance for using generic balanced cabling to deliver remote power (extra-low voltage, limited power source - ELV LPS) to terminal equipment across customer premises. The report is intended as provisional guidance to support new installations and renovations where power must be supplied over telecommunications cabling.
Key topics and technical requirements
The Technical Report consolidates practical design and installation considerations without replacing safety or EMC regulations. Key topics include:
- Cabling selection and performance: guidance on which classes of balanced cabling are suitable for carrying both data and remote power while meeting transmission requirements.
- Installation conditions: effects of ambient temperature, cable bundling and routing, and factors that influence conductor temperature rise and current carrying capacity.
- Transmission requirements: ensuring that powering does not adversely affect data transmission performance of the cabling subsystem.
- Remote power delivery: architectural options for power insertion (endpoint, midspan, combinations) and how powering affects cabling design and performance.
- Connecting hardware: considerations for mating/unmating connectors that carry power, and selection of compatible terminations and patching hardware.
- Mitigation measures (Annex A): practical options to reduce temperature rise or limit impacts (e.g., bundle management, cable selection, installation layout).
- Informative data: tables and figures illustrating relationships such as current-per-pair versus temperature rise and example powering topologies.
Note: ISO/IEC TR 29125:2010 complements but does not replace local electrical safety or EMC standards.
Applications
This Technical Report is practical for deployments where remote powering over balanced cabling is required, for example:
- Networked terminal equipment in offices, homes, industrial sites and data centres that receive ELV/LPS power via the cabling infrastructure.
- New cabling installations or renovations where future powered devices may be added.
- Design reviews to verify that cabling topology, bundle sizes and routing support both data and remote power.
Although the report is technology-agnostic, it is commonly referenced when implementing remote power solutions (for example Power over Ethernet-style deployments) to ensure cabling suitability.
Who should use it
- Cabling designers and specifiers
- Installation contractors and integrators
- Network and facilities managers
- Systems architects evaluating powered-device deployments
- Equipment manufacturers assessing cabling requirements
Related standards
Keywords: ISO/IEC TR 29125:2010, remote powering, balanced cabling, telecommunications cabling requirements, ELV LPS, cabling selection, installation conditions, current carrying capacity, transmission requirements.