Q1: What is an SFP-25G-LR module?
A: The SFP-25G-LR is an SFP28 transceiver module supporting 25 Gbps Ethernet over single-mode fiber (SMF) using a 1310 nm DFB laser, designed for long-reach links up to 10 km.
Q2: What is the typical maximum transmission reach?
A: Up to 10 km over G.652 SMF. Some engineered links may push slightly beyond with low insertion loss and RS-FEC enabled.
Q3: What fiber type and connector does it use?
A: Uses duplex LC connector with 9/125 µm single-mode fiber (SMF), typically OM1/OS2.
Q4: Is SFP-25G-LR compatible with different brand equipment?
A: Yes. It is MSA-compliant, compatible across major vendors (Cisco, Arista, Juniper, Huawei, etc.), assuming host supports SFP28 optics.
Q5: Is the module hot-swappable?
A: Yes, as an SFP28 module, it supports hot-plug insertion/removal without powering down host devices.
Q6: Does it support diagnostics (DDM/DOM)?
A: Yes. It includes Digital Diagnostic Monitoring (SFF-8472), allowing monitoring of optical tx/rx power, temperature, voltage, and more.
Q7: What data rates are supported?
A: Designed for 25 Gbps, typical range up to 28 Gb/s, with many modules also supporting 10 Gbps (10.31 Gbps) depending on host compatibility.
Q8: What is the typical power consumption?
A: Power consumption is typically ≤ 1.5 W (often ~1.2 W), depending on module vendor.
Q9: What operating temperature ranges are supported?
A: Standard modules: 0 °C to 70 °C; extended range: -5 °C to +85 °C; industrial variants may support -40 °C to +85 °C.
Q10: Which standards does it conform to?
A: Complies with IEEE 802.3cc / 25GBASE-LR, plus MSA SFP28 standards SFF-8402, SFF-8431, SFF-8472.
Q11: How to verify compatibility with my networking device?
A: Check if device supports 25GBASE-LR optics and allows generic SFP28 modules; verify module part number or MSA support.
Q12: What applications are typical for SFP-25G-LR?
A: Commonly used for data center inter-rack links, server uplinks, campus backbone, ISP aggregation, and high-speed SMF interconnects.
Q13: Can SFP-25G-LR operate at 10 Gbps?
A: Yes-dual-rate capable modules support 10.31 Gbps, though host port support is required. Reach and diagnostics may vary accordingly.
Q14: Is RS-FEC required for full reach at 25 G?
A: No-10 Gbps mode doesn't need FEC; 25 Gbps mode requires RS-FEC on host ports to reliably reach 10 km.
Q15: Are industrial or rugged variants available?
A: Yes. Industrial-grade versions (e.g. SFP-25G-LR-I) support wide temperature ranges and enhanced reliability, often with lifetime warranties.