1G SFP refers to a Small Form-Factor Pluggable (SFP) optical transceiver module that supports a data rate of 1 Gigabit per second (Gbps). SFP modules are compact, hot-swappable devices used in networking equipment such as switches, routers, and network interface cards.

Key features of 1G SFP modules include:

1. Data Rate: 1G SFP modules operate at a data rate of 1 Gbps, making them suitable for applications requiring relatively lower bandwidth compared to higher-speed alternatives.

2. Interfaces: 1G SFP modules can have various types of interfaces, including:

• Ethernet: Commonly used for 1 Gigabit Ethernet (1GbE) connections.

• Fiber Channel: Used in Fibre Channel applications that require 1 Gbps connectivity.

3. Form Factor: SFP modules have a small form factor, allowing for high port density in networking equipment. The standardized size and shape facilitate compatibility with a wide range of devices that support the SFP form factor.

4. Fiber Types: 1G SFP modules are available for both multimode and single-mode fiber optic cables, offering flexibility for different network configurations and distances.

5. Applications: 1G SFP modules are widely used in various networking environments, including data centers, enterprise networks, and telecommunications, where 1 Gbps connectivity is sufficient for the specific application.

6. Hot-Swappability: SFP modules are designed to be hot-swappable, meaning they can be inserted or removed from a compatible device without powering down the equipment.

Examples of 1G SFP modules include 1000BASE-SX (for multimode fiber) and 1000BASE-LX/LH (for single-mode and long-distance multimode fiber).

It's important to note that advancements in networking technology have introduced higher-speed alternatives, such as 10G SFP+, 25G SFP28, and 40G QSFP+, which offer increased data rates for applications with higher bandwidth requirements.