Q1: What is an SFP-25G-SR-S module?
A: The SFP-25G-SR-S is an SFP28 transceiver module supporting 25 Gbps Ethernet over multimode fiber (MMF) at 850 nm wavelength, compliant with 25GBASE-SR standards.
Q2: What is the maximum supported transmission distance?
A: Supports up to 70 m on OM3 and 100 m on OM4 multimode fiber at 25 Gbps. RS-FEC (Reed-Solomon Forward Error Correction) on host ports is required to achieve the full reach.
Q3: What connector and fiber type are used?
A: It uses LC duplex connectors over 50/125 µm multimode fiber (MMF) like OM3 or OM4.
Q4: Is SFP-25G-SR-S compatible across brands?
A: Yes. It is MSA-compliant and works with major vendors such as Cisco, Arista, Juniper, Huawei, Dell, Extreme, etc., given their equipment supports 25 Gbps optics.
Q5: Does it support hot-swapping?
A: Yes, as an SFP28 module it is fully hot-pluggable, allowing insertion/removal without shutting down host equipment.
Q6: Does SFP-25G-SR-S support Dual-rate (10/25G) operation?
A: Yes, many compatible versions support dual-rate operation, allowing them to work at both 10 Gbps and 25 Gbps speeds (e.g., IEEE-compliant fallback mode).
Q7: Does it support Digital Diagnostic Monitoring (DDM/DOM)?
A: Yes. SFP-25G-SR-S modules typically support DOM/DDM via SFF-8472, enabling monitoring of optical power, temperature, voltage, etc.
Q8: What is the power consumption of the module?
A: Typical maximum power consumption is around 1.2 W, depending on vendor and operation mode.
Q9: What temperature range is supported?
A: Standard commercial grade supports 0 °C to 70 °C. Industrial variants may offer extended ranges (-40 °C to 85 °C) depending on vendor specifications.
Q10: Which IEEE/Multi-Source Agreements does SFP-25G-SR-S conform to?
A: Conforms to IEEE 802.3by (25GBASE-SR), and SFP28 MSA SFF-8402, along with SFF-8431/8432/8472 for form factor and diagnostic protocols.
Q11: How to verify compatibility with my equipment?
A: Check that your switch or NIC supports 25GBASE-SR optics and accepts generic/third-party SFP28 modules without firmware restrictions. Compatibility lists often include this module's part number or equivalent.
Q12: What applications is SFP-25G-SR-S ideal for?
A: Ideal for data center top-of-rack/inter-rack uplinks, high-throughput SANs, server-to-switch and switch-to-switch links in high-density rack deployments.
Q13: Can SFP-25G-SR-S auto-negotiate to 10G?
A: Yes, dual-rate versions can operate at 10.31 Gbps (10GBASE-SR) where supported by host hardware. However, operating distance for 10G may extend slightly based on fiber quality and FEC requirement.
Q14: Is RS-FEC required for full distance at 25G?
A: Yes-full 70-100 m reach on OM3/OM4 requires RS-FEC enabled on host ports as per IEEE802.3by clause requirements.