Clear DefinitionsSFP Module
1 min read
Pronunciation
[ess-eff-pee mod-yool]
Analogy
Like a replaceable light bulb that you can swap out without turning off the lamp.
Definition
A Small Form-factor Pluggable transceiver that provides modular, hot-swappable network connectivity over fiber or copper.
Key Points Intro
SFP modules enable flexible network interface configurations in servers and switches.
Key Points
Hot-swappable: can be inserted or removed without powering down
Multi-protocol: supports 1G/10G/25G speeds and various media
Distance: choices for short-reach copper or long-reach fiber
Diagnostics: supports digital optical monitoring (DOM)
Example
A data center operator uses SFP+ modules in a blockchain node rack to connect via single-mode fiber at 10 Gbps.
Technical Deep Dive
SFP modules comply with IEEE 802.3 and SFF-8472 standards, using LC connectors for fiber and RJ45 for copper. DOM provides voltage, current, temperature, and optical power metrics via I²C. Host NICs use EEPROM IDs to auto-detect module capabilities.
Security Warning
Physical access to SFP ports can enable malicious taps or interceptors if the network is not encrypted.
Caveat
Module compatibility varies by vendor and device; ensure firmware support for desired protocols.
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