Siemon exceeds ISO/IEC class II channel requirements with TERA


Class II channels and permanent links are qualified up to 2GHz and constructed from category 8.2 connecting hardware, cables and cords to meet future 25 Gb/s (25GBASE-T) and 40 Gb/s (40GBASE-T) applications.

Third party test laboratory Intertek ETL performed the electrical testing on a two connector 30-metre TERA channel and verified compliance to the draft ISO/IEC requirements. The test configuration was constructed of Siemon’s TERA connectors, new category 8.2 cable and hybrid TERA to RJ-45 equipment cords. Not only did the testing verify compliance for all parameters, including coupling attenuation, but the results clearly indicated headroom to draft class II limits.

‘After testing a representative sample, Intertek confirmed compliance of the TERA system to the class II requirements, thus making it suitable to support IEEE 802.3bq 25GBASE-T and 40GBASE-T,’ said Antoine Pelletier, project engineer, Intertek. ‘State-of-the-art test equipment and fixtures are used to verify this in the laboratory. Compliant category 8.2 products are precisely designed and manufactured for smooth transmission performance up to 2,000MHz.’

‘Siemon’s fully shielded TERA category 7A/class FA end-to-end cabling solution has long been the highest-performing twisted-pair copper cabling system available,’ said Lee Funnell, technical manager EMEA at Siemon. ‘Due to its already superior performance, we were confident that TERA would easily achieve category 8.2 compliance with plenty of margin.’

Utilising TERA’s quadrant-pair isolation technology, Siemon’s class II channel provides an end-to-end cabling solution to support future 25GBase-T and 40GBase-T implementations in data centre switch-to-server applications. Class II twisted-pair cabling will share open and common specifications, which ensures interoperability and backwards compatibility with the reach to support a much broader range of architectures for switch-to-server connections, including switches placed in top of rack (ToR), middle of row (MoR) and end of row (EoR) configurations.

For access to more information and to view the Interk ETL report, visit:

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