By Andee | 20 January 2025 | 0 Comments
How to choose the right 25G Optical transceiver for Data Center?
What is 25G Optical tranceiver?
25G optical transceiver is a high-speed, fiber-optic communication device designed to transmit and receive data at a rate of 25 gigabits per second (Gbps) per channel. It is a compact, plug-and-play module widely used in modern data centers, telecommunications networks, and enterprise networking environments to support high-bandwidth applications.
Key Features of a 25G SFP28 Optical Transceiver:
Speed and Performance
Operates at a data rate of 25Gbps, making it ideal for next-generation Ethernet and optical transport networks (OTNs).
Supports high-performance applications like cloud computing, video streaming, and artificial intelligence workloads.
Form Factors Common form factors include:
SFP28: A Small Form-factor Pluggable (SFP) transceiver designed specifically for 25Gbps performance. It is backward-compatible with SFP+ for 10Gbps applications.
QSFP28: Quad Small Form-factor Pluggable, designed for 4x25Gbps lanes (totaling 100Gbps). Often used in 100G networks but can operate at 25Gbps per channel.
Optical Interfaces
Single-Mode Fiber (SMF): For long-distance communication (up to 10km, 40km, or more).
Multi-Mode Fiber (MMF): For short-range communication (typically up to 100m or 300m using OM3 or OM4 fiber).
Direct Attach Copper (DAC): For very short distances (1–3 meters) with copper cables.
Active Optical Cable (AOC): For short-range applications using pre-terminated fiber-optic cables.
Transmission Distance
25G SFP28 transceivers support varying distances depending on the type of fiber and wavelength:
SR (Short Range): For distances of up to 100–300 meters using MMF.
LR (Long Range): For distances up to 10km using SMF.
ER (Extended Range): For distances up to 40km or beyond with SMF.
Wavelengths
Common wavelengths include 850nm (for MMF), 1310nm, and 1550nm (for SMF).
Compliance Standards
Adheres to IEEE 802.3 standards for 25G Ethernet.
Often compatible with protocols like 25GBASE-SR, 25GBASE-LR, and 25GBASE-ER.
Applications of 25G SFP28 Optical Transceivers:
Data Centers
Used in leaf-spine network architectures to connect switches and servers, enabling high-speed, low-latency communication.
Essential for scalable, high-density deployments in modern hyperscale data centers.
Telecommunications Networks
Used for high-bandwidth backhaul links in 5G networks.
Supports the growing demand for data in mobile broadband services.
Enterprise Networks
Enables faster and more reliable connections for enterprise applications, including virtualization, AI/ML workloads, and data analytics.
Cloud Computing and Storage
Connects servers, storage arrays, and switches in cloud environments, where high-speed connections are critical for workloads.
5G Infrastructure
Plays a significant role in fronthaul, midhaul, and backhaul networks of 5G systems, providing reliable connectivity for high-speed mobile services.
Advantages of 25G Optical Transceivers:
High Bandwidth: Offers a cost-effective way to achieve 2.5x the bandwidth of 10G transceivers.
Power Efficiency: Consumes less power per gigabit compared to 40G or 100G transceivers.
Cost-Effective Scalability: Provides a smooth upgrade path from 10G to 25G, making it suitable for future-proof network expansions.
Compatibility: Backward-compatible with 10G networks, allowing gradual upgrades without replacing the entire infrastructure.
Types of 25G SFP28 Optical Transceivers:
25GBASE-SR:
For short-range communication (up to 100m or 300m).
Operates at 850nm wavelength over MMF.
25GBASE-LR:
For long-range communication (up to 10km).
Operates at 1310nm wavelength over SMF.
25GBASE-ER:
For extended-range communication (up to 40km).
Operates at 1550nm wavelength over SMF.
CWDM and DWDM:
For wavelength-division multiplexing networks, enabling multiple channels over a single fiber.
Comparison with Other Transceivers:
25G optical transceivers are critical components in modern high-speed networks, enabling efficient and scalable connectivity in applications like data centers, 5G, and enterprise networks. They offer a balance of high bandwidth, low power consumption, and cost efficiency, making them a popular choice for future-proof network designs.
How to choose a 25G optical transceiver for Data Center?
Choosing a 25G optical transceiver for a data center involves several important considerations to ensure compatibility, performance, and future scalability. Here's a step-by-step guide to help you make an informed decision:
1. Determine the Required Form Factor
Optical transceivers come in various form factors. The most common ones for data centers are:
SFP28 (Small Form-Factor Pluggable 28): This is the most common 25G transceiver form factor, designed for 25Gbps speeds and typically used in data centers for server connectivity and switch uplinks.
QSFP28 (Quad Small Form-Factor Pluggable 28): If you're considering the need for higher aggregate bandwidth (e.g., 100G or 40G), QSFP28 modules are useful as they can support 4x25G links.
SFP+: This is for 10Gbps, but sometimes data centers use them with breakout cables to achieve multiple 10G links, though SFP28 is more standard for 25G.
2. Choose the Optical Media Type
There are two main types of optical fiber: single-mode fiber (SMF) and multi-mode fiber (MMF). The choice between them depends on the distance and network design.
Single-mode fiber: Ideal for long-distance transmission (up to 10 km or more), typically used for inter-data center connections or long-haul links.
Multi-mode fiber: Better suited for shorter distances (up to 300m to 500m depending on the type of fiber and the transceiver), typically used within the data center.
Transceivers are also classified by the type of fiber they support:
SR (Short Range): Typically for MMF, with distances up to 100 meters.
LR (Long Range): For SMF, with distances up to 10 km or more.
ER (Extended Range): For SMF, designed for distances up to 40 km.
3. Consider the Wavelength and Transmission Distance
Wavelength: Make sure the transceiver matches the wavelength that your fiber type supports. For example, 850 nm is common for MMF, while 1310 nm or 1550 nm is used for SMF.
Transmission distance: Check the maximum transmission distance supported by the transceiver. For example:
25G-SR (Short Range) typically supports up to 100 meters on OM4 multimode fiber.
25G-LR (Long Range) supports up to 10 km on SMF.
4. Check Compatibility with Your Network Equipment
Vendor Compatibility: Ensure the optical transceiver is compatible with your existing switches, routers, and servers. Many data center operators prefer transceivers from the same manufacturer as their networking hardware for compatibility and support reasons.
Network Speed: The transceiver should be capable of matching the network's speed requirements. Ensure that the device supports 25Gbps and that the network can handle the higher speeds.
5. Power Consumption
Consider the power consumption of the transceiver. High power usage can increase operational costs and affect your data center's cooling needs. Generally, 25G SFP28 transceivers have moderate power consumption compared to higher-speed transceivers like 100G, but it’s worth checking the specifications.
6. Opt for the Latest Standards and Features
Compliance: Ensure the transceiver is compliant with relevant standards, such as IEEE 802.3by for 25G Ethernet, and MSA (Multi-Source Agreement) for optical modules.
Advanced Features: Some transceivers come with advanced features such as digital diagnostics (DDM/DOM) that allow monitoring of the transceiver’s performance, including temperature, voltage, and optical power levels.
7. Cost and Availability
Budget: Optical transceivers vary widely in price, and the cost can depend on factors such as form factor, brand, range, and type of fiber used. Make sure you select a solution that fits within your data center’s budget while ensuring future scalability.
Supply Chain: Consider availability and the vendor’s support, especially if you have specific brand preferences or need to procure transceivers in bulk.
8. Brand and Support
Some of the leading brands in optical transceivers include:
Cisco
Arista
Juniper
Mellanox
Finisar
Broadcom
Intel
Choosing reputable brands with solid warranties and customer support can help ensure reliable operation and easier troubleshooting.
9. Testing and Certification
Before finalizing a purchase, it's a good idea to perform in-house or field testing to ensure the transceiver performs as expected. Many vendors offer certified modules that guarantee interoperability with their systems.
Example Use Cases:
Short-range 25G MMF:
Use case: Connecting servers in the same rack or adjacent racks.
Transceiver: 25G SR (Short Range), SFP28, operating on OM3/OM4 fiber, up to 100 meters.
Long-range 25G SMF:
Use case: Connecting two distant data centers or over a campus network.
Transceiver: 25G LR (Long Range), SFP28, operating on SMF, up to 10 km.
By considering these factors, you’ll be able to select a 25G optical transceiver that aligns with your data center's needs, ensuring optimal performance and scalability. Let me know if you'd like more details on any specific aspect!
25G optical transceiver is a high-speed, fiber-optic communication device designed to transmit and receive data at a rate of 25 gigabits per second (Gbps) per channel. It is a compact, plug-and-play module widely used in modern data centers, telecommunications networks, and enterprise networking environments to support high-bandwidth applications.
Key Features of a 25G SFP28 Optical Transceiver:
Speed and Performance
Operates at a data rate of 25Gbps, making it ideal for next-generation Ethernet and optical transport networks (OTNs).
Supports high-performance applications like cloud computing, video streaming, and artificial intelligence workloads.
Form Factors Common form factors include:
SFP28: A Small Form-factor Pluggable (SFP) transceiver designed specifically for 25Gbps performance. It is backward-compatible with SFP+ for 10Gbps applications.
QSFP28: Quad Small Form-factor Pluggable, designed for 4x25Gbps lanes (totaling 100Gbps). Often used in 100G networks but can operate at 25Gbps per channel.
Optical Interfaces
Single-Mode Fiber (SMF): For long-distance communication (up to 10km, 40km, or more).
Multi-Mode Fiber (MMF): For short-range communication (typically up to 100m or 300m using OM3 or OM4 fiber).
Direct Attach Copper (DAC): For very short distances (1–3 meters) with copper cables.
Active Optical Cable (AOC): For short-range applications using pre-terminated fiber-optic cables.
Transmission Distance
25G SFP28 transceivers support varying distances depending on the type of fiber and wavelength:
SR (Short Range): For distances of up to 100–300 meters using MMF.
LR (Long Range): For distances up to 10km using SMF.
ER (Extended Range): For distances up to 40km or beyond with SMF.
Wavelengths
Common wavelengths include 850nm (for MMF), 1310nm, and 1550nm (for SMF).
Compliance Standards
Adheres to IEEE 802.3 standards for 25G Ethernet.
Often compatible with protocols like 25GBASE-SR, 25GBASE-LR, and 25GBASE-ER.
Applications of 25G SFP28 Optical Transceivers:
Data Centers
Used in leaf-spine network architectures to connect switches and servers, enabling high-speed, low-latency communication.
Essential for scalable, high-density deployments in modern hyperscale data centers.
Telecommunications Networks
Used for high-bandwidth backhaul links in 5G networks.
Supports the growing demand for data in mobile broadband services.
Enterprise Networks
Enables faster and more reliable connections for enterprise applications, including virtualization, AI/ML workloads, and data analytics.
Cloud Computing and Storage
Connects servers, storage arrays, and switches in cloud environments, where high-speed connections are critical for workloads.
5G Infrastructure
Plays a significant role in fronthaul, midhaul, and backhaul networks of 5G systems, providing reliable connectivity for high-speed mobile services.
Advantages of 25G Optical Transceivers:
High Bandwidth: Offers a cost-effective way to achieve 2.5x the bandwidth of 10G transceivers.
Power Efficiency: Consumes less power per gigabit compared to 40G or 100G transceivers.
Cost-Effective Scalability: Provides a smooth upgrade path from 10G to 25G, making it suitable for future-proof network expansions.
Compatibility: Backward-compatible with 10G networks, allowing gradual upgrades without replacing the entire infrastructure.
Types of 25G SFP28 Optical Transceivers:
25GBASE-SR:
For short-range communication (up to 100m or 300m).
Operates at 850nm wavelength over MMF.
25GBASE-LR:
For long-range communication (up to 10km).
Operates at 1310nm wavelength over SMF.
25GBASE-ER:
For extended-range communication (up to 40km).
Operates at 1550nm wavelength over SMF.
CWDM and DWDM:
For wavelength-division multiplexing networks, enabling multiple channels over a single fiber.
Comparison with Other Transceivers:
| Feature | 10G | 25G | 40G | 100G |
| Data Rate | 10Gbps | 25Gbps | 40Gbps | 100Gbps |
| Efficiency (per Gbps) | Lower | Higher | Lower | Higher |
| Power Consumption | Higher | Lower | Higher | Moderate |
| Applications | Legacy networks | Modern data centers, 5G | Large networks | Hyperscale data centers |
25G optical transceivers are critical components in modern high-speed networks, enabling efficient and scalable connectivity in applications like data centers, 5G, and enterprise networks. They offer a balance of high bandwidth, low power consumption, and cost efficiency, making them a popular choice for future-proof network designs.
How to choose a 25G optical transceiver for Data Center?
Choosing a 25G optical transceiver for a data center involves several important considerations to ensure compatibility, performance, and future scalability. Here's a step-by-step guide to help you make an informed decision:
1. Determine the Required Form Factor
Optical transceivers come in various form factors. The most common ones for data centers are:
SFP28 (Small Form-Factor Pluggable 28): This is the most common 25G transceiver form factor, designed for 25Gbps speeds and typically used in data centers for server connectivity and switch uplinks.
QSFP28 (Quad Small Form-Factor Pluggable 28): If you're considering the need for higher aggregate bandwidth (e.g., 100G or 40G), QSFP28 modules are useful as they can support 4x25G links.
SFP+: This is for 10Gbps, but sometimes data centers use them with breakout cables to achieve multiple 10G links, though SFP28 is more standard for 25G.
2. Choose the Optical Media Type
There are two main types of optical fiber: single-mode fiber (SMF) and multi-mode fiber (MMF). The choice between them depends on the distance and network design.
Single-mode fiber: Ideal for long-distance transmission (up to 10 km or more), typically used for inter-data center connections or long-haul links.
Multi-mode fiber: Better suited for shorter distances (up to 300m to 500m depending on the type of fiber and the transceiver), typically used within the data center.
Transceivers are also classified by the type of fiber they support:
SR (Short Range): Typically for MMF, with distances up to 100 meters.
LR (Long Range): For SMF, with distances up to 10 km or more.
ER (Extended Range): For SMF, designed for distances up to 40 km.
3. Consider the Wavelength and Transmission Distance
Wavelength: Make sure the transceiver matches the wavelength that your fiber type supports. For example, 850 nm is common for MMF, while 1310 nm or 1550 nm is used for SMF.
Transmission distance: Check the maximum transmission distance supported by the transceiver. For example:
25G-SR (Short Range) typically supports up to 100 meters on OM4 multimode fiber.
25G-LR (Long Range) supports up to 10 km on SMF.
4. Check Compatibility with Your Network Equipment
Vendor Compatibility: Ensure the optical transceiver is compatible with your existing switches, routers, and servers. Many data center operators prefer transceivers from the same manufacturer as their networking hardware for compatibility and support reasons.
Network Speed: The transceiver should be capable of matching the network's speed requirements. Ensure that the device supports 25Gbps and that the network can handle the higher speeds.
5. Power Consumption
Consider the power consumption of the transceiver. High power usage can increase operational costs and affect your data center's cooling needs. Generally, 25G SFP28 transceivers have moderate power consumption compared to higher-speed transceivers like 100G, but it’s worth checking the specifications.
6. Opt for the Latest Standards and Features
Compliance: Ensure the transceiver is compliant with relevant standards, such as IEEE 802.3by for 25G Ethernet, and MSA (Multi-Source Agreement) for optical modules.
Advanced Features: Some transceivers come with advanced features such as digital diagnostics (DDM/DOM) that allow monitoring of the transceiver’s performance, including temperature, voltage, and optical power levels.
7. Cost and Availability
Budget: Optical transceivers vary widely in price, and the cost can depend on factors such as form factor, brand, range, and type of fiber used. Make sure you select a solution that fits within your data center’s budget while ensuring future scalability.
Supply Chain: Consider availability and the vendor’s support, especially if you have specific brand preferences or need to procure transceivers in bulk.
8. Brand and Support
Some of the leading brands in optical transceivers include:
Cisco
Arista
Juniper
Mellanox
Finisar
Broadcom
Intel
Choosing reputable brands with solid warranties and customer support can help ensure reliable operation and easier troubleshooting.
9. Testing and Certification
Before finalizing a purchase, it's a good idea to perform in-house or field testing to ensure the transceiver performs as expected. Many vendors offer certified modules that guarantee interoperability with their systems.
Example Use Cases:
Short-range 25G MMF:
Use case: Connecting servers in the same rack or adjacent racks.
Transceiver: 25G SR (Short Range), SFP28, operating on OM3/OM4 fiber, up to 100 meters.
Long-range 25G SMF:
Use case: Connecting two distant data centers or over a campus network.
Transceiver: 25G LR (Long Range), SFP28, operating on SMF, up to 10 km.
By considering these factors, you’ll be able to select a 25G optical transceiver that aligns with your data center's needs, ensuring optimal performance and scalability. Let me know if you'd like more details on any specific aspect!
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