Introduction To The CISCO SFP-10/25G-CSR-S Module

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.

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 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, please contact us via email: sales@moduletek.com

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Introduction To The CISCO SFP-10/25G-CSR-S Module