Feature: Connectors
The CS connector specification is supported by the CS consortium, a group of fibre-connectivity manufacturers formed to promote the new 400Gb fibre-optic connector
interface while still maintaining backward compatibility with today’s four-channel QSFP28 modules (via an adapter for OSFP). Applications for the CS interface include patch cables and cassette and breakout setups for single and multimode fibres.
Doubling down on density Complex applications are driving the requirement to push higher data density to the rack, and dense compute technologies need close proximity to optimise workflows. Critical assets need to be physically located where space is at an increased premium or simply not available. Based on the size of traditional connector systems, Panduit’s CS connector provides 50% greater port density per RU when used in Panduit’s HD Flex cabling system, and double the density in QSFP-DD and OSFP transceivers compared with LC connector solutions. Much of the need for a new type of connector is driven by the
continued search for higher density in today’s modern data-centre applications. Te narrower CS adapter allows more connectors in the same RU footprint. Its decreased height allows for additional vertical space between adapters, and improves physical access to the adapter release mechanism – normally an issue with highly- dense LC duplex patch fields. For example, a 1RU enclosure with duplex LC cassettes will max out at 144 fibres, whereas the same enclosure can accept up to 216 fibres (using 36-fibre, 18-port, double-width CS cassettes), or 192 fibres (using 16-fibre, 8-port standard width CS cassettes).
Patching and cassettes Te CS fibre patch cord is available in single and multi mode and has a very low profile, with a unitary cable and push/pull tab to facilitate easy moves, adds and changes in ultra-high-density installations. CS cassettes, also available in single and multi mode, provide 4-to-1 or 8-to-1 breakout options for 100G, 200G and 400G applications. Te 4-to-1 breakout cassette has 2 MPO-12 connectors on the back and eight CS connectors on the front, providing two distinct breakout channels for SR4 applications. Te 8-to-1 breakout cassette has one MPO-24 connector on the back and eight CS connectors on the front for 400G SR8 applications using an MPO-24 connector. Both cassettes provide install densities of 192 fibres per RU. A third cassette type provides three MPO-12 connectors on the back and 18 CS connectors on the front. Tis cassette is universally
wired and is used on both ends of a cassette-trunk-cassette link. Tis offers the flexibility to increase the density of Panduit HD Flex from 144 fibres using LC connectors to 216 fibres using CS connectors. Cable management in the rack using unitary cable reduces
congestion in pathways, and the push-pull insert/withdraw feature allows easy access in high-density applications without disturbing adjacent circuits. Te CS connector, therefore, reduces the connectivity footprint within hyperscale, multi-tenant and large data-centre environments. Te CS connector is set to become an increasingly popular
choice following its adoption within QSFP and QSFP MSA backing by the consortium for on-board optics (COBO), and more recent progression as a new TIA connector standard – TIA 604-19/FOCIS-19, where CS is referenced as the SEN connector. Panduit is a founding member of the CS consortium, a vendor-
neutral organisation dedicated to educating end users and design consultants on the technical merits of the CS fibre connector solution.
Panduit CS connectors and patch-cords
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