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SFP+/QSFP

SFP vs QSFP
SFP QSFP
SFP (Small Form-factor Pluggable) transceiver utilizes a single channel to transmit and receive data A QSFP (Quad Small Form-factor Pluggable) combines four channels into one module to achieve four times the bandwidth.
SFP (1 Lane): Features a small footprint with a single lane for transmitting (Tx) and receiving (Rx). It traditionally uses LC duplex or SC simplex connectors. QSFP (4 Lanes): Features a wider footprint. It houses four independent transmit and four independent receive channels. It typically uses high-density MPO/MTP connectors (for parallel optics) or an internal multiplexer over LC duplex (for Wavelength Division Multiplexing).
Form Factor Primary Data Rates Common Standard / Types Typical Use Cases
SFP 1 Gbps 1G SFP Legacy enterprise links
SFP+ 10 Gbps 10G SFP+ Modern enterprise cores
SFP28 25 Gbps 25G SFP28 5G FTTA / Data centers
SFP56 50 Gbps 50G SFP56 Mid-haul wireless, specialized compute
QSFP+ 40 Gbps (4 x 10G) 40G Base-SR4 / LR4 Enterprise distribution layers
QSFP28 100 Gbps (4 x 25G) 100G Base-SR4 / LR4 Data center leaf-spine fabrics
QSFP56 200 Gbps (4 x 50G) 200G FR4 / DR4 AI clusters and cloud infrastructure
800GBASE 2xSR4/SR8 OSFP Finned Top PAM4 850nm 50m DOM Dual MPO-12/APC MMF Optical Transceiver Module

800GBASE 2xSR4/SR8 OSFP Finned Top PAM4 850nm 50m DOM Dual MPO-12/APC MMF Optical Transceiver Module

- Cisco OSFP-800G-VR8 Compatible

- NVIDIA/Mellanox MMA4Z00-NS Compatible

- Arista Networks OSFP-800G-2VSR4 Compatible

- Juniper Networks OSFP-2X400G-VR4-P Compatible

- H3C OSFP-800G-VR8-MM850-DMPO Compatible

- Others

800GBASE 2xDR4/DR8 OSFP Finned Top PAM4 1310nm 500m DOM Dual MPO-12/APC SMF Fiber Optical Transceiver Module

800GBASE 2xDR4/DR8 OSFP Finned Top PAM4 1310nm 500m DOM Dual MPO-12/APC SMF Fiber Optical Transceiver Module

NVIDIA/Mellanox MMS4X00-NM Compatible

The Cisco OSFP-800G-DR8 Compatible

Juniper Networks OSFP-2X400G-DR4-P Compatible

H3C OSFP800-800G-DR8-SM1310-DMPO Compatible

10Gb/s SFP+ Active Optical Cable

10Gb/s SFP+ Active Optical Cable

- The KCO-SFP-10G-AOC-xM Compatible SFP+ Active Optical Cables are direct-attach fiber assemblies with SFP+ connectors and operate over Multi-Mode Fiber (MMF).

- This KCO-SFP-10G-AOC-xM AOC is compliant with SFF-8431 MSA standards.

- It provides a cost-efficient solution as compared to using discrete optical transceivers and optical patch cables and is suitable for 10Gbps connections within racks and across adjacent racks.

- The optics are completely contained inside the cable, which—without LC optical connectors to clean, scratch, or break—dramatically increases reliability and lowers maintenance costs.

- AOCs are most often used for creating 1-30m short switch-to-switch or switch-to-GPU links.

40Gb/s QSFP+ TO QSFP+ Active Optical Cable

40Gb/s QSFP+ TO QSFP+ Active Optical Cable

-Support 40GBASE-SR4/QDR application

- Compliant to QSFP+ Electrical MSA SFF-8436

- Multi rate of up to 10.3125Gbps

- +3.3V single power supply

- Low power consumption

- Operating case temp: Commercial: 0°C to +70 °C

- RoHS compliant

100Gb/s SFP28 Active Optical Cable

100Gb/s SFP28 Active Optical Cable

- Support 100GBASE-SR4/EDR application

- Compliant to QSFP28 Electrical MSA SFF-8636

- Multi rate of up to 25.78125Gbps

- +3.3V single power supply

- Low power consumption

- Operating case temp Commercial: 0°C to +70 °C

- RoHS compliant

400Gb/s QSFP-DD to 2x200G QSFP56 AOC Active Optical Cable MMF

400Gb/s QSFP-DD to 2x200G QSFP56 AOC Active Optical Cable MMF

The KCO-QDD-400-AOC-xM active optical cables are designed for use in 400 Gigabit Ethernet links over OM4 multimode fibers, and contain eight multi-mode fibers (MMF) optic transceivers per end, each operating at data rates of up to 53Gb/s.

This active optical cable is compliant with IEEE 802.3cd, OIF-CEI-04.0, QSFP-DD MSA, and QSFP-DD-CMIS-rev4p0.

Thin and lightweight AOC cables simplify cable management, enabling an efficient system airflow, which is critical in high-density racks.

It is used extensively in cloud and supercomputers due to its low cost, high-value proposition, and increased reliability.

200G QSFP-DD Active Optical Cable OM3

200G QSFP-DD Active Optical Cable OM3

The KCO-200G-QSFP-DD-xM active optical cable is designed for use in 200 Gigabit Ethernet links over OM3 multimode fiber.

This KCO-200G-QSFP-DD-xM active optical cable is compliant with QSFP-DD MSA V5.0 and CMIS V4.0.

It provides a connection of a 200G QSFP-DD port to another QSFP-DD ports and is suitable for quick and simple connections within racks and across adjacent racks.

Cisco QSFP-4 x 10G-AOC1M Compatible 40G QSFP+ to 4 x 10G SFP+ Active Optical Breakout Cable

Cisco QSFP-4 x 10G-AOC1M Compatible 40G QSFP+ to 4 x 10G SFP+ Active Optical Breakout Cable

- The KCO-40QSFP-4SFP10-AOC-xM Cisco QSFP-4X10G-AOC1M Compatible 40G QSFP+ to 4 SFP+ Breakout Active Optical Cable operates over Multi-Mode Fiber (MMF).

- This breakout cable is compliant with SFF-8436, SFF-8431 and SFP+ & QSFP MSA standards.

- It provides a connection of a 40G QSFP+ port on one end and to four 10G SFP+ ports on the other end and is suitable for quick and simple connections within racks and across adjacent racks.

Cisco Compatible 1G SFP Passive Direct Attach Copper Twinax Cable SFP to SFP 30AWG

Cisco Compatible 1G SFP Passive Direct Attach Copper Twinax Cable SFP to SFP 30AWG

- The KCO-1G-DAC-xM 1G SFP Passive Direct Attach Copper Twinax Cable is designed for use in 1GBASE Ethernet.

- This KCO-1G-DAC-xM DAC cable is compliant with SFF-8472, SFF-8024, and SFP+ MSA.

- With these features, this easy to install, high speed, cost-effective direct attach copper twinax cable is suitable for short-distance connectivity within a rack or between adjacent racks in data centers.

The usage of SFP and QSFP on FTTH and FTTA Solution

 Design Metric  FTTH (Fiber-to-the-Home)  FTTA (Fiber-to-the-Antenna)
 Edge Module (SFP)  GPON / XGS-PON SFP (Simplex SC)  25G SFP28 eCPRI (Duplex or BiDi LC)
 Core Module (QSFP)  QSFP28 / QSFP-DD Network Uplinks  QSFP28 Port-to-SFP28 Radio Breakouts
 Primary Protocol  Ethernet / ATM Layering  CPRI (4G) / eCPRI (5G Packetized)
 Temp Requirement  Commercial (0°C to 70°C) inside CO  Industrial (-40°C to 85°C) up the mast
 Usage [ Central Office OLT ] ===( QSFP Uplink )===> [ Core Switch ]
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( PON SFP )
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[ Passive Splitter ] ——> [ Home ONT / ONU ]
 [ BBU Hub / DU ] ===( QSFP28 Breakout )===> [ 4x SFP28 Tower Ports ]
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( Vertical Trunk )
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[ 25G SFP28 RRU ]
 FTTH networks rely heavily on Passive Optical Network (PON) topologies to distribute internet from a Central Office (CO) to individual homes  The SFP28 (25G) Standard: Modern 5G Macro cells run on 25G SFP28 transceivers built specifically for eCPRI (Enhanced Common Public Radio Interface) protocols.
 OLT Side: Optical Line Terminal (OLT) chassis use specialized PON SFP modules (GPON, XGS-PON, or 25G-PON). These are unique because they are BiDi (Bidirectional) simplex SFPs—using a single SC connector to transmit on one wavelength (e.g., 1490nm) and receive on another (e.g., 1310nm) to serve up to 32 or 64 homes over one fiber strand.  Industrial Hardening: SFTs deployed up the tower must be Industrial Temperature rated (-40°C to 85°C) to survive extreme seasonal weather. They are integrated into ruggedized outdoor housings like FullAXS or ODVA before being plugged directly into the Remote Radio Unit (RRU)
 ONT/ONU Side: The client-side optical network terminal inside the home or business often utilizes standard 1G SFP or 10G SFP+ modules plugged into a residential gateway.  BiDi & CWDM: To save weight and fiber resources on the tower asset, technicians frequently use BiDi SFP28 or CWDM SFP28 modules, allowing multiple frequency bands to share fewer glass strands.
 QSFP Usage (The Central Office Core: Home users do not use QSFP modules. Instead, QSFP28 (100G) or QSFP-DD (400G/800G) transceivers are used inside the Central Office. They aggregate the massive combined traffic coming from dozens of PON SFP line cards and route it upstream out to the broader internet core.  Breakout Deployments: Instead of running 24 individual SFP cables, a high-density baseband router will utilize QSFP28 (100G) ports in breakout mode. A single QSFP28 port maps out to a 1-to-4 breakout MPO trunk cable, efficiently delivering four independent 25G eCPRI channels straight up to four separate tower radios.

Process
Process
Process