Overview - IEC 61935-2:2003 (Patch cords and work area cords)
IEC 61935-2:2003 specifies test methods and requirements for modular plug cords (patch cords and work area cords) used in generic cabling systems in accordance with ISO/IEC 11801. The standard’s objective is to ensure compatibility, performance and long‑term reliability of modular plug terminations and cable assemblies by defining acceptance (per‑unit) tests and periodic (sampled) durability tests and by describing the required test configuration and equipment.
Key topics and technical requirements
- Scope and purpose
- Defines methods to verify that modular plug cords are compatible with ISO/IEC 11801 cabling and perform reliably over their operational lifetime.
- Test configuration and equipment
- Uses a network analyzer, r.f. transformers (baluns), twisted‑pair test leads and impedance matching terminations; nominal test impedance is 100 Ω (methods may be used for 120 Ω or 150 Ω but are not evaluated for them).
- Test heads terminate each end of the patch cord; test head characteristics influence pass/fail criteria (see Clause 7).
- Acceptance tests (per cord)
- Visual inspection (workmanship and marking)
- Wire map (continuity, shorts, transposed/reversed/split pairs)
- Pair‑to‑pair NEXT (Near End Crosstalk)
- Return loss
- Additional tests when components are not certified: insertion loss (attenuation), ELFEXT, propagation delay, delay skew, DC resistance and resistance unbalance.
- Periodic (sampled) tests
- Mechanical and environmental durability tests performed on representative samples, including tensile strength, flexure, bending/twisting, crushing, dust exposure, climatic sequence and coupling attenuation.
- Measurement considerations
- Differential and common‑mode terminations per IEC 61935‑1 are required; resistive terminations preferred.
- Calibration, uncertainty and test head NEXT/return‑loss centring are described to ensure valid measurements.
Applications and who uses this standard
- Cable and connector manufacturers - to qualify patch cord designs and production processes.
- Test laboratories and certification bodies - to certify compliance with ISO/IEC 11801 cabling systems.
- Network installers and system integrators - to verify installed patch cords meet performance and reliability requirements.
- Procurement and QA teams - to specify acceptance criteria and sample test schedules for purchasing or quality control.
Practical benefits include reduced interoperability issues, predictable channel performance, and demonstrated lifetime reliability of work area cabling.
Related standards
Keywords: IEC 61935-2, patch cords, work area cords, testing, modular plug cords, ISO/IEC 11801, NEXT, return loss, insertion loss, cable assembly testing.
