Skip to Main Content
  • Contact

CS Connector

The Original CS® Standard connector design offers exceptional performance at an economical price. The CS is a Very Small Form Factor (VSFF) connector and is ideal for space-saving solutions. The CS connector allows you to double the density in patch panels compared to an LC duplex. It offers the ability to add more room for cable management as well as better airflow within a rack. The unique push-pull tab allows for better usability in high-density applications. The connector accepts up to 2.0/3.0mm duplex fiber. The connector has been adopted by QSFP-DD, OSFP, and COBO, Standardized by TIA.
CS Licensees

  • Performance exceeds LC
  • 40% size reduction over LC Duplex
  • Grade B IEC61753-1 Random Mating
  • Exceeds GR-326-CORE requirements
Parameters Single-mode Multimode
SM Premium Low Loss SM Premium SM Premium Low Loss SM Premium Premium
Typical Insertion Loss (dB)* 0.05 0.08 0.07 0.12 0.05
Max Insertion Loss (dB)* 0.15 0.20 0.15 0.25 0.15
Typical Return Loss (dB) ≥55 ≥65 ≥25
Operating Temperature (°C) -40 to +75
Durability <0.2dB typical change, 500 mating’s
Ferrule Ø 125μm 127μm

* Per random mating testing IEC 61753-1

Data Center

Onboard Optics



Quantum computing


REACH logo
International Electrotechnical Commission
TIA logo

CS Connector, is now standardized by Telecommunications Industry Association (TIA). TIA has published ANSI/TIA-604-19 Type SEN on 7/30/2021, which is the intermateability standard of CS Connector, Adapter, and Transceiver.

Yes, the CS connector can accept cable up to 3mm in diameter.

The CS connector has 4 different length push/pull tabs that can be used. The tab is designed to be held and pushed or pulled to remove the connector from an adapter or transceiver .