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An "Arista 1G SFP 20KM" refers to

a Small Form-factor Pluggable (SFP) transceiver module for a 1 Gigabit per second (Gbps) network with a maximum transmission distance of 20 kilometers (km). These modules are used in Arista (and compatible) switches to connect network devices over single-mode fiber (SMF) optic cable, with common versions including the LX/LH and BiDi types.

Data Rate: 1 Gbps
Distance: Up to 20 km (12.4 miles) over single-mode fiber (SMF)
Fiber Type: Single-mode fiber (SMF)
Connector: Typically an LC duplex connector
Technology: Includes variants like LX/LH (Long-reach/Long-haul) and BiDi (Bi-Directional) transceivers
Functionality:
- LX/LH: Standard 1310nm wavelength for 20km reach
- BiDi: Uses a single fiber strand and requires a complementary transceiver at the other end, with specific wavelengths like 1310nmTx/1490nmRx
Other Features: Often includes features like hot-swappability, Digital Optical Monitoring (DOM) support, and compatibility with a wide range of Arista and third-party equipment

SFP-1G-BXU-20-AR-AO | Arista Networks® | Transceivers
Specifications. This Arista Networks® compatible SFP transceiver provides 1000Base-BX throughput up to 20km over single-mode fiber...
AddOn Networks
Arista SFP-1G-LX-20 Compatible 1000BASE-LX/LH ... - QSFPTEK
SFP-1G-LX-20-AR Arista® compatible SFP 1000Base - ATGBICS
SFP-1G-LX-20-AR Arista® Compatible Transceiver SFP 1000Base-LX (1310nm, SMF, 20km, LC, DOM) * Form Factor. SFP. * Connector Type. ...
ATGBICS

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Arista SFP-1G-LX-20 1000BASE-LX/LH SFP Transceiver ...

FS.com

https://www.fs.com › ... › 1/2.5G Modules › 1G SFP

FS.com

https://www.fs.com › ... › 1/2.5G Modules › 1G SFP

Arista Networks SFP-1G-LX-20 compatible SFP transceiver supports up to 20km link lengths over LC duplex SMF fiber. Each SFP transceiver module is ...See more

$10.00In stock$45 delivery30-day returns

SFP-1G-BXD-20-AR-C | Arista Networks® | Transceivers

ProLabs

https://www.prolabs.com › arista-sfp-1g-bxd-20-ar-c-10...

ProLabs

https://www.prolabs.com › arista-sfp-1g-bxd-20-ar-c-10...

This Arista Networks® compatible SFP transceiver provides 1000Base-BX throughput up to 20km over single-mode fiber (SMF) using a wavelength of 1490nmTx/1310nmRx

Arista SFP-1G-BXD-20 1000BASE-BX10-D SFP BIDI ...

HiFiber.com

https://www.hifiber.com › item › SFP-1G-BXD-20 › ari...

HiFiber.com

https://www.hifiber.com › item › SFP-1G-BXD-20 › ari...

Support 1.25Gbps Data Links; 1490nm FP TX /1310nm RX; 10-KM @ 9/125 μm SMF; With DDM; Single 3. 3V Power and TTL Logic Interface; Hot-Pluggable SFP ...See more

$9.85

Transceiver 1000BASE-LX/LH SFP 1310nm 20km DOM ...

fiberopticdistribution.com

https://www.fiberopticdistribution.com › arista-networks-...

fiberopticdistribution.com

https://www.fiberopticdistribution.com › arista-networks-...

Transceiver 1000BASE-LX/LH SFP 1310nm 20km DOM SFP-1G-LX-20 Arista Networks Compatible. Fiber Optic Patch Cables Fiber Patch Cables Singlemode Fiber Cables. ...

Arista 1G SFP 20KM from www.fiberopticdistribution.com

$30.00In stockFree delivery28-day returns

SFP-1G-BXU-20-AR-AO | Arista Networks® | Transceivers

AddOn Networks

https://www.addonnetworks.com › Products

AddOn Networks

https://www.addonnetworks.com › Products

This Arista Networks® compatible SFP transceiver provides 1000Base-BX throughput up to 20km over single-mode fiber (SMF) using a wavelength of ...See more

1GBASE-LX-20 SFP 1310nm 20km SMF Module for Arista

NADDOD

https://www.naddod.com › products

NADDOD

https://www.naddod.com › products

Arista SFP-1G-LX-20 Compatible 1GBASE-LX-20 SFP 1310nm 20km DOM Duplex LC transceiver Module for SMF ; In Stock: Available ; Shipping:$ 25.21 to United States ...See more

SFP-1G-BXU-20/SFP-1G-BXD-20 Arista Compatible 1.25 ...

eBay

https://www.ebay.com › ... › Switch Modules

eBay

https://www.ebay.com › ... › Switch Modules

SFP-1G-BXU-20/SFP-1G-BXD-20 Arista Compatible 1.25Gbps 20km Transceiver ; Quantity. More than 10 available ; Item number. 197759626861 ; Country of Origin. China.See more

$33.60Free delivery

Arista® 1000Base-LX/LH SFP 1.25G 20km Transceiver

Fibertop

https://www.fibertopsfp.com › arista-sfp-1g-lx-20-com...

Fibertop

https://www.fibertopsfp.com › arista-sfp-1g-lx-20-com...

Product Highlights · Supports up to 1.25Gbps bit rates · Hot-pluggable SFP footprint · 1310nm FP laser and PIN photo detector, Up to 20km for SMF transmission.

Arista Networks SFP-1G-CW-1590-20 Compatible 1.25Gbps SFP ...

dawnraytech.com

https://www.dawnraytech.com › product › arista-networ...

dawnraytech.com

https://www.dawnraytech.com › product › arista-networ...

SFP CWDM1590-LX provides 1Gb/s throughput up to 20km over single-mode fiber ... Arista Networks Compatible 1G CWDM SFP 20km Transceiver Module Wavelength Options.

People also ask

What is the maximum distance for SFP?

Fiber Optic Cable Distance: A Comprehensive Guide

The maximum distance for an SFP is determined by the module type and the cabling. For short distances, SFP copper modules (1000BASE-T) can reach up to 100 meters, while SFP Direct Attach Copper (DAC) cables are typically limited to around 10 meters. For longer distances, fiber-optic SFPs can go much further: multimode fiber SFPs can transmit up to 550 meters or 2 km, while single-mode fiber SFPs can reach 10 km, 40 km, 80 km, or even up to 160 km or more, depending on the specific module.

Copper

SFP Copper Module (1000BASE-T): Up to 100 meters over Cat5e or Cat6a/Cat7 cables.
SFP DAC Cable: Around 10 meters, with some exceptions up to 15 or 20 meters.

SFPs 101: Six Fundamentals of SFP Transceivers - StarTech.com
Jan 8, 2019 — Single mode SFP transceivers can transmit anywhere from 2km all the way to 80km in distance. Standard Single mode SFPs ...
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SFP Transceivers: SFP, SFP+, SFP28 - What are the Differences?
SFP for Gigabit Ethernet. Copper-based SFP modules using Gigabit Ethernet (1000BASE-T and 1000BASE-TXI) networking have a range of...
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What Is an SFP Port on a Gigabit Switch? - FS.com
May 24, 2025 — Primarily used for short-range connectivity in LAN settings. SFP Ports: Multimode Fiber (MMF): Supports distances up t...
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Introduction of Cisco 10G SFP+ Modules - FS.com
The maximum transmission distance can be 300m on standard singlemode fiber (SMF, G. 652). Cisco SFP-10G-SR-X, however, can achieve...
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Single Mode SFP vs Multimode SFP: What the Differences ... - Optcore
Dec 2, 2024 — 2. Transmission Distance. Single-mode SFP modules utilize specially designed transmitters and SM fibers to enhance outp...
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What is SFP Port? Everything You Need to Know - Optcore
Nov 29, 2024 — FAQ * If you use a 1000BASE-T copper SFP module, the max distance reaches 100m over the cat5e cable. * If you use a f...
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How Far Can 10GbE Run by 10GBASE-T SFP+ or Fiber to Ethernet ...
Mar 21, 2025 — Additionally, the max distance of connection over Ethernet copper is 100 meters. Check the Cisco website, the SFP-10G-
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Unlocking the Potential of Fiber SFP Modules: A Comprehensive Guide
May 17, 2024 — Q: What maximum distance can be achieved using gigabit fiber SFP modules? A: The maximum achievable distance depends o...
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Ultimate Guide to SFP Transceiver Modules - Cables and Kits
The SFP-10G-LR is what you need. It can send data up to 10 kilometers over single-mode fiber at a wavelength of 1310 nm. This make...
CablesAndKits

What is the maximum length of SFP DAC cable？ - Walsun
The maximum length of an SFP DAC (Direct Attach Copper) cable is typically around 10 meters. However, some manufacturers may offer...
Walsun

SFPs 101: Six Fundamentals of SFP Transceivers - StarTech.com

Jan 8, 2019 — Single mode SFP transceivers can transmit anywhere from 2km all the way to 80km in distance. Standard Single mode SFPs ...

StarTech.com

SFP Transceivers: SFP, SFP+, SFP28 - What are the Differences?

SFP for Gigabit Ethernet. Copper-based SFP modules using Gigabit Ethernet (1000BASE-T and 1000BASE-TXI) networking have a range of...

Pro Optix

What Is an SFP Port on a Gigabit Switch? - FS.com

May 24, 2025 — Primarily used for short-range connectivity in LAN settings. SFP Ports: Multimode Fiber (MMF): Supports distances up t...

FS.com

Introduction of Cisco 10G SFP+ Modules - FS.com

The maximum transmission distance can be 300m on standard singlemode fiber (SMF, G. 652). Cisco SFP-10G-SR-X, however, can achieve...

FS.com

Single Mode SFP vs Multimode SFP: What the Differences ... - Optcore

Dec 2, 2024 — 2. Transmission Distance. Single-mode SFP modules utilize specially designed transmitters and SM fibers to enhance outp...

Optcore

What is SFP Port? Everything You Need to Know - Optcore

Nov 29, 2024 — FAQ * If you use a 1000BASE-T copper SFP module, the max distance reaches 100m over the cat5e cable. * If you use a f...

Optcore

How Far Can 10GbE Run by 10GBASE-T SFP+ or Fiber to Ethernet ...

Mar 21, 2025 — Additionally, the max distance of connection over Ethernet copper is 100 meters. Check the Cisco website, the SFP-10G-

QSFPTEK

Unlocking the Potential of Fiber SFP Modules: A Comprehensive Guide

May 17, 2024 — Q: What maximum distance can be achieved using gigabit fiber SFP modules? A: The maximum achievable distance depends o...

AscentOptics

Ultimate Guide to SFP Transceiver Modules - Cables and Kits

The SFP-10G-LR is what you need. It can send data up to 10 kilometers over single-mode fiber at a wavelength of 1310 nm. This make...

CablesAndKits

What is the maximum length of SFP DAC cable？ - Walsun

The maximum length of an SFP DAC (Direct Attach Copper) cable is typically around 10 meters. However, some manufacturers may offer...

Walsun

Do SFP modules have to match?

No, not all SFP modules are compatible with every device. While they follow a standardized physical form factor that allows them to fit into any SFP port, many network device manufacturers require their specific, vendor-locked modules for a device to function properly. This is often due to vendor-specific codes that the device uses to verify the module's authenticity.

Why compatibility is limited

Vendor lock-in:
Many manufacturers, such as Cisco, HP, and Huawei, program their switches and routers to only recognize their own brand of SFP modules. This is often done through a "code" or a whitelist stored in the device's firmware.
Internal configurations:
Even if a module is physically compatible, internal configurations and data stored in the module's EEPROM can cause it to be rejected by the host device.
Hardware and software requirements:
Some SFP modules require specific hardware or software versions on the network device to work correctly.

Check the vendor's compatibility list:
The most reliable way to ensure a module will work is to consult the specific device manufacturer's compatibility list, available in the device's datasheet or on their website.
Purchase vendor-specific SFPs:
To avoid compatibility issues, you can buy modules that are explicitly made for your brand of equipment, though these are often more expensive.
Use compatible third-party SFPs:
Many third-party manufacturers create modules that are coded to work with specific brands. It's essential to purchase from a reputable supplier and to check that the third-party module is compatible with your specific device model.

Do all cisco SFP modules works in all switches? - Cisco Community
Sep 28, 2024 — Not all Cisco SFP modules are universally compatible across all Cisco switches, even if the SFP port on the switch is ...
Cisco Community

How come SFP modules are so incompatible?
Jan 19, 2022
Network Engineering Stack Exchange

SFP Compatibility Guide - LightOptics
SFP delivers 1Gbps of data and SFP+ supports the data rates up to 10 Gbps. Having the same size, an SFP module can fit seamlessly ...
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SFP Compatibility Guide and How to Use a Compatible SFP Module?
Prominent manufacturers often claim that only their branded SFP modules can function with their equipment. While using branded mod...
Unoptix

Are ALL SFP Modules Compatible - Key2Optics
Oct 26, 2022 — The answer is NO. ... Are ALL SFP Modules Compatible? Unfortunately, there is no SFP module (Optical Modules, Wiki) in...
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Are SFP Modules Universal? The Ultimate Truth | Cloudtronics
May 7, 2025 — How to Know If an SFP Module Will Work * Check the switch/router manual. Brands list the SFP modules that work with th...
Cloudtronics

SFP Module Compatibility: What You Need to Know
SFP module compatibility refers to the ability of a transceiver to operate seamlessly with a specific switch, router, or networkin...
Anderson Corporation

MikroTik SFP Transceiver Modules: Essential Guide to Compatibility and Performance
Aug 19, 2024 — In most cases, however, different manufacturers use industry-standard modules, which means that these can work on vari...
FiberMall

Can wrong SFP module damage equipment?
Jul 6, 2023 — No, wrong or incompatible SFP modules are not normally expected to damage equipment. SFP modules are designed to be ele...
Network Engineering Stack Exchange

SFP: Complete guide to Small Form-Factor Pluggable: 7 things you need to know
Apr 8, 2024 — In most cases, SFP+ modules are backwards compatible with SFP ports, but they will be limited to 1.25Gbps. However, SFP...
A3 Association for Advancing Automation

networking - Must I install SFP+ transceivers in pairs?
Apr 4, 2011 — Short note about buying SFP:s on eBay, it's becoming more and more common that switch manufacturers firmware only accep...
Server Fault

Do all cisco SFP modules works in all switches? - Cisco Community

Sep 28, 2024 — Not all Cisco SFP modules are universally compatible across all Cisco switches, even if the SFP port on the switch is ...

Cisco Community

How come SFP modules are so incompatible?

Jan 19, 2022

Network Engineering Stack Exchange

SFP Compatibility Guide - LightOptics

SFP delivers 1Gbps of data and SFP+ supports the data rates up to 10 Gbps. Having the same size, an SFP module can fit seamlessly ...

LightOptics

SFP Compatibility Guide and How to Use a Compatible SFP Module?

Prominent manufacturers often claim that only their branded SFP modules can function with their equipment. While using branded mod...

Unoptix

Are ALL SFP Modules Compatible - Key2Optics

Oct 26, 2022 — The answer is NO. ... Are ALL SFP Modules Compatible? Unfortunately, there is no SFP module (Optical Modules, Wiki) in...

key2optics.com

Are SFP Modules Universal? The Ultimate Truth | Cloudtronics

May 7, 2025 — How to Know If an SFP Module Will Work * Check the switch/router manual. Brands list the SFP modules that work with th...

Cloudtronics

SFP Module Compatibility: What You Need to Know

SFP module compatibility refers to the ability of a transceiver to operate seamlessly with a specific switch, router, or networkin...

Anderson Corporation

MikroTik SFP Transceiver Modules: Essential Guide to Compatibility and Performance

Aug 19, 2024 — In most cases, however, different manufacturers use industry-standard modules, which means that these can work on vari...

FiberMall

Can wrong SFP module damage equipment?

Jul 6, 2023 — No, wrong or incompatible SFP modules are not normally expected to damage equipment. SFP modules are designed to be ele...

Network Engineering Stack Exchange

SFP: Complete guide to Small Form-Factor Pluggable: 7 things you need to know

Apr 8, 2024 — In most cases, SFP+ modules are backwards compatible with SFP ports, but they will be limited to 1.25Gbps. However, SFP...

A3 Association for Advancing Automation

networking - Must I install SFP+ transceivers in pairs?

Apr 4, 2011 — Short note about buying SFP:s on eBay, it's becoming more and more common that switch manufacturers firmware only accep...

Server Fault

Feedback

SFP-1G-BXD-AR Arista® compatible SFP 1000Base

ATGBICS

https://atgbics.com › products › sfp-1g-bxd-ar-arista-co...

ATGBICS

https://atgbics.com › products › sfp-1g-bxd-ar-arista-co...

ATGBICS Arista® Compatible SFP-1G-BXD-AR SFP 1000Base-BX form factor network transceiver supports a distance of up to 20km over single-mode fibre (SMF) ...

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AI Overview

Arista SFP-1G-LX-20 1000BASE-LX/LH SFP Transceiver ...

SFP-1G-BXD-20-AR-C | Arista Networks® | Transceivers

Arista SFP-1G-BXD-20 1000BASE-BX10-D SFP BIDI ...

Transceiver 1000BASE-LX/LH SFP 1310nm 20km DOM ...

SFP-1G-BXU-20-AR-AO | Arista Networks® | Transceivers

1GBASE-LX-20 SFP 1310nm 20km SMF Module for Arista

SFP-1G-BXU-20/SFP-1G-BXD-20 Arista Compatible 1.25 ...

Arista® 1000Base-LX/LH SFP 1.25G 20km Transceiver

Arista Networks SFP-1G-CW-1590-20 Compatible 1.25Gbps SFP ...

Related Links

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Is SFP Compatible With SFP+? Can 10G SFP+ Run at 1G SFP Port?

Introduction of Cisco 10G SFP+ Modules

SFP-1G-BXD-AR Arista® compatible SFP 1000Base

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