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Introducing the CISCO SFP-10/25G-CSR-S Module

Time: 2023-04-20

      The 10G network is based on the IEEE802.3 specification (10GBASE-SR), which states that the 10G-SR module can transmit up to 300m/400m over OM3/OM4 fiber. Network builders built the equipment at both ends of the fiber according to the maximum distance of 300m/400m, but the 25G-SR module only transmits up to 70m/100m on OM3/OM4 fibers, and some 10G networks can't be directly upgraded to 25G using the 25G-SR module.
      CISCO has introduced an optical module model SFP-10/25G-CSR-S, which supports transmission of 300m/400m over OM3/OM4 fiber.

SFP-10/25G-CSR-S optical module transmission rate level transmission type
Figure 1 SFP-10/25G-CSR-S optical module transmission rate level transmission type

      The module also has a dual-rate feature that allows it to interconnect with 25GBASE-SR and 10GBASE-SR optical modules.

Table 1 Optical Module Types for Interconnecting with SFP-10/25G-CSR-S Optical Modules

Type of local module Type of opposite module Link transmission rate Link transmission rate
@OM3/OM4
CISCO 10/25G CSR 10G-SR 10G 300/400m
CISCO 10/25G CSR 25G-SR 25G 70/100m
CISCO 10/25G CSR CISCO 10/25G CSR 10/25G 300/400m

 

      For interconnection with 25G modules, RS-FEC (Forward Error Correction) is required to be enabled on the 25G ports, and the types of FEC supported by the SFP-10/25G-CSR-S are listed below:

Table 2 FEC types supported by the SFP-10/25G-CSR-S

Interface Description Bit Error Rate (BER) before FEC  FEC Requirement (host side) Bit Error Rate (BER) after FEC Maximum Transmission Distance(OM3/OM4)
IEEE 25GBASE-SR
CISCO SFP-25G-SR-S		 Multimode Short-Range Transmission
(OM3/OM4)		 5E-05 RS-FEC 1E-12 70/100m
CISCO SFP-10/25G-
CSR-S		 Multimode Short-Range Transmission
(OM3/OM4)		 5E-05 RS-FEC 1E-12 300/400m#
1E-08 FC-FEC* 1E-12 70/100m
1E-12 No-FEC* 1E-12 30/50m

                     # Transmission distance when interconnecting SFP-10/25G-CSR-S and IEEE 25GBASE-SR or SFP-25G-SR-S: 70/100m
                     * SFP-10/25G-CSR-S modules at both ends of the fiber
      It is also known that host vendors such as HP-ARUBA (Model: JL485A), H3C (Model: SFP-25G-CSR-MM850), Extreme (Model: 10503) and other host vendors have already launched 25G-CSR/25G-eSR/25G-ESR optical module products with transmission distances of up to 300 meters @ OM3/400 meters @ OM4 。
      Moduletek Limited can provide CISCO SFP-10/25G-CSR-S compatible optical module products and 25G-CSR/25G-eSR/25G-ESR optical module products compatible with host vendors such as HP-ARUBA, H3C and Extreme.
      If you have any questions about the above content, you can contact us by Email : web@moduletek.com
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