GLC-SX-MMD vs SFP-10G-SR ： What's the difference?

Both the GLC-SX-MMD and the SFP-10G-SR are transceiver modules, but they have different specifications, speeds, and applications. Here's a breakdown of the differences:

1. Speed:

   • GLC-SX-MMD: Operates at 1 Gigabit per second (1 Gbps or Gigabit Ethernet).

   • SFP-10G-SR: Operates at 10 Gigabits per second (10 Gbps or 10 Gigabit Ethernet).

2. Wavelength and Cable Type:

   • GLC-SX-MMD: Typically uses an 850nm wavelength and is designed for Multi-Mode Fiber (MMF). It can reach distances up to 550 meters using OM2 MMF.

   • SFP-10G-SR: Also uses an 850nm wavelength for MMF but is designed for 10G data rates. Depending on the type of MMF used (OM3, OM4), it can reach distances of 300m (OM3) to 400m (OM4).

3. Digital Optical Monitoring (DOM):

   • GLC-SX-MMD: The "MMD" in the name indicates that this module supports DOM, which allows users to monitor parameters of the SFP, such as optical output power, optical input power, temperature, laser bias current, and supply voltage.

   • SFP-10G-SR: Typically, these modules also support DOM, but it might not always be indicated in the name.

4. Applications:

   • GLC-SX-MMD: Used for Gigabit Ethernet applications on switches, routers, and other networking equipment.

   • SFP-10G-SR: Used for 10 Gigabit Ethernet applications in high-bandwidth environments like data centers, high-performance computing networks, and enterprise core/distribution layers.

5. Form Factor:

   • Both modules use the Small Form-factor Pluggable (SFP) design, but the SFP-10G-SR is specifically an SFP+ module, which is an enhanced version of SFP designed to support higher data rates like 10G.

6. Compatibility:

   • Compatibility with network equipment largely depends on the manufacturer and the specific device. While many devices are designed to support a wide range of SFP modules, it's always a good idea to check the compatibility list of the device in question. Some devices may not support 10G modules or might have specific requirements for Gigabit modules.

In summary, the main difference between the two is the data rate: GLC-SX-MMD is for 1 Gigabit Ethernet, while SFP-10G-SR is for 10 Gigabit Ethernet. If you're planning to deploy or upgrade your network, ensure that your equipment is compatible with the modules you intend to use and that you choose the right module for the desired data rate and distance.
 

What do GLC-SX-MMD and SFP-10G-SR represent respectively?

What is GLC-SX-MMD?

GLC-SX-MMD is one of the most commonly used standard Cisco SFP, and it is a hot-swappable input/output device plugged into a Gigabit Ethernet port. It is an improved version of the GLC-SX-MM in that they include Digital Optical Monitoring (DOM) to monitor the transceiver status. These transceivers operate over multimode fiber (MMF) and can reach distances of up to 550 meters.

The GLC-SX-MMD Small Form-Factor Pluggable MMF 850 nm Transceiver is a Gigabit interface converter that links your switches and routers to the network. The hot-swappable input/output device plugs into a Gigabit Ethernet port or slot. It is compatible with the IEEE 802.3z 1000BASE-SX standard, operates on legacy 50μm multimode fiber and links up to 550m on 62.5μm Fiber Distributed Data Interface (FDDI)-grade multimode fiber links up to 220m and up to 1km over laser-optimized 50μm multimode fiber cable.

The GLC-SX-MMD is a specific model of Cisco's SFP (Small Form-Factor Pluggable) transceiver module. Here's a breakdown of its specifications and features:

1. Speed and Protocol: The GLC-SX-MMD is designed for Gigabit Ethernet (1 Gbps) operations.

2. Wavelength and Fiber Type:

   • Operates on an 850nm wavelength.

   • Designed for use with Multi-Mode Fiber (MMF).

3. Reach/Distance: Depending on the type of multi-mode fiber used, it can achieve distances up to:

   • 550 meters with OM2 MMF.

   • Longer distances with OM3 and OM4 MMF.

4. DOM Support (Digital Optical Monitoring): The "MMD" in its name indicates that this module supports Digital Optical Monitoring. This feature allows users to monitor real-time parameters of the SFP, such as optical output power, optical input power, temperature, laser bias current, and supply voltage.

5. Form Factor: It uses the standard SFP form factor, which allows for hot swapping (i.e., you can plug it in or remove it without turning off the device).

6. Applications: Commonly used in Gigabit Ethernet applications on Cisco switches, routers, and other networking equipment.

7. LC Connector: Like many SFP modules, the GLC-SX-MMD uses an LC duplex connector and is used mainly for short to medium distances in data centers, enterprise wiring closets, and other networking environments.

The GLC-SX-MMDis the most popular multimode 1G SFP transceiver for low-cost fiber networking. It utilizes the advantage of GLC-T and GLC-SX-MM, which have been the most cost-effective SFP module in the market.

In summary, the GLC-SX-MMD is a Cisco SFP module designed for Gigabit Ethernet operations over multi-mode fiber, with support for Digital Optical Monitoring. If you're using or planning to use this module, always make sure to check the compatibility with your specific Cisco equipment, as not all devices support all SFP modules.

 

What is sfp 10g sr?

The SFP-10G-SR is a 10GBASE-SRSP+ module, which can reach up to 300 meters matched with OM3 Multimode Fiber (MMF), known as the lowest-cost, lowest-power modules implemented with a VCSEL.

The SFP-10G-SR is a specific model of Cisco's SFP+ (Small Form-Factor Pluggable Plus) transceiver module. Here's a detailed breakdown of its specifications and features:

1. Speed and Protocol:

   • Designed for 10 Gigabit Ethernet (10 Gbps) operations.

   • Also used in 10G Fibre Channel applications.

2. Wavelength and Fiber Type:

   • Operates on an 850nm wavelength.

   • Designed for use with Multi-Mode Fiber (MMF).

3. Reach/Distance:

   • It can achieve a range of up to 300 meters on OM3 MMF.

   • For OM4 MMF, the reach can be up to 400 meters.

4. Form Factor:

   • Uses the SFP+ form factor, an enhanced version of the SFP design to accommodate higher speeds (up to 10 Gbps).

   • Allows for hot swapping (i.e., you can plug it in or remove it without powering off the device).

5. Applications:

   • Commonly used in 10 Gigabit Ethernet applications on Cisco switches, routers, and other networking devices.

   • Due to its speed and small form factor, it's popular in modern data centers, enterprise networks, and high-bandwidth applications.

6. LC Connector:

   • Uses an LC duplex connector.

   • Designed for short-range communication, making it ideal for connecting devices within the same data center or building.

7. Other features:

   • Many SFP+ modules, including the SFP-10G-SR, support Digital Optical Monitoring (DOM), allowing the user to monitor parameters of the transceiver in real-time, such as optical output power, optical input power, temperature, and more.

In essence, the SFP-10G-SR is a Cisco SFP+ module designed for 10 Gigabit operations over multi-mode fiber for relatively short distances (up to 400 meters depending on the type of MMF). As with any module, it's important to check compatibility with your specific Cisco equipment, since not all devices support all SFP+ modules.