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100G Transceivers Guide

100G Transceivers Guide

100G QSFP28 transceivers are high-speed, compact optical transceivers designed for data centers, enterprise networks, and high-performance computing environments. These transceivers support data rates up to 100 Gigabits per second (Gbps) and are commonly used for high-density 100G Ethernet and InfiniBand applications.


Scalable 100G Solutions for Spine-Leaf Architectures

JTOPTICS® 100G transceivers are essential for high-speed, high-density data center connectivity. They enable fast and reliable data transmission between switches, servers, and storage systems in both spine-leaf and core-distribution network architectures. These modules support scalable bandwidth for cloud computing, virtualization, and AI workloads, making them ideal for modern enterprise and hyperscale data centers.
JTOPTICS 100G Optical Transceiver Module for High-Speed Data Center Connectivity
JTOPTICS 100G Optical Transceiver Module for High-Speed Data Center Connectivity
100G QSFP28 SR4 Transceiver
100G QSFP28 SR4 Transceiver
100GBASE-SR4 QSFP28 transceiver is a parallel 100G optical transceiver. It provides increased port density and total system cost savings. This 100G QSFP28 full-duplex optical transceiver offers 4 independent transmit and receive channels, each capable of 25 Gbps operation for an aggregate data rate of 100 Gbps on 100 meters over OM4 MMF. Generally, 100GBASE-SR4 QSFP28 transceiver converts parallel electrical input signals into parallel optical signals by a driven VCSEL array. The transmitter module accepts electrical input signals compatible with CML (common mode logic) levels.
100G QSFP28 PSM4 Transceiver
100G QSFP28 PSM4 Transceiver
100GBASE-PSM4 QSFP28 transceiver is a parallel 100G single-mode optical transceiver with an MTP/MPO fiber ribbon connector. It uses 8 fibers (4 transmit and 4 receive), each transmitting at 25 Gbps, resulting in an aggregate data rate of 100 Gbps on 500 meters over SMF. The working principle of 100GBASE-PSM4 QSFP28 transceiver is nearly the same with the 100G QSFP28 SR4 transceiver. The only difference is that PSM4 works over SMF, while SR4 works over OM4 MMF.
100GBASE-CWDM4 QSFP28 Transceiver
100GBASE-CWDM4 QSFP28 Transceiver
100GBASE-CWDM4 QSFP28 transceiver is a full duplex 100G QSFP28 optical transceiver that provides a high-speed link at aggregated data rate of 100 Gbps over 2 km on SMF. The transmitter path converts four lanes of serial electrical data to optical signal. The optical signals from the four lasers are optically multiplexed and coupled to single-mode fiber through an industry standard LC optical connector. The optical signals are engineered to meet the CWDM4 MSA specifications. On the receive side, the four incoming wavelengths are separated by an optical demultiplexer into four separated channels.
100G QSFP28 LR4 Transceiver
100G QSFP28 LR4 Transceiver
100GBASE-LR4 QSFP28 transceiver converts 4 input channels of 25 Gbps electrical data to 4 channels of LAN WDM optical signals and then multiplexes them into a single channel for 100G optical transmission. On the receiver side, the module demultiplexes a 100G optical input into 4 channels of LAN WDM optical signals and then converts them to 4 output channels of electrical data. The central wavelengths of the 4 LAN WDM channels are 1295.56, 1300.05, 1304.58 and 1309.14 nm as members of the LAN WDM wavelength grid defined in IEEE 802.3ba.

Frequently Asked Questions

They are the same. The “QSFP” form factor was originally defined for <10G speeds. When it was adopted for 40G, the name became QSFP+ to denote the higher aggregate performance. The same “QSFP” form factor was later adopted for 100G but the electrical interface had to be upgraded to handle 25Gbps/lane. The electrical interface for 100G can handle up to 28Gbps, hence the engineering and industry name is QSFP28. JTOPTICS refers to the 100G form factor as “100G QSFP” to avoid any confusion.

The JTOPTICS QSFP-100G-ZR4 supports link distances up to 80km. A minimum of 12dB attenuation is required to prevent permanent damage to the receiver - refer to the optics datasheet for optical specs. The QSFP-100G-ZR4 is supported on a limited set of platforms – refer to the Transceiver and Cable Guide for supported platforms. The QSFP-100G-LR4 supports links up to 10km over duplex single mode fiber. Enabling FEC with QSFP-100G- LR4 optics on JTOPTICS switches can allow for links beyond 10km with single mode fiber. 

Like the QSFP-100G-SWDM4 transceiver described above, the JTOPTICS QSFP-100G-SRBD transceiver also provides 100Gbs bandwidth over standard duplex multi-mode fiber. However, unlike the SWDM4 transceiver (which transmits 4 x 25Gbps wavelengths out of the Tx port, and receives 4 x 25Gbps wavelengths on the Rx port), each optical port on the SRBD contains both a transmitter and receiver, running at full duplex 50Gb/s over a single fiber. The two ports of the QSFP-100G-SRBD provide an aggregate 100Gb/s of bandwidth. The QSFP- 100G-SRBD is supported on all JTOPTICS QSFP 100G ports, and can be used for links up to 70m of OM3 or up to 100m of OM4 multi-mode fiber.

No. The 100G QSFP form factor has just 4 electrical lanes, which is not enough to support 10 lanes of 10G electrical interface. A 100G QSFP can only support a 4x10G or 4x25G electrical interface, which can be used as 4x10GbE or 4x25GbE, but not 10x 10GbE.. As a result the 100G QSFP SR4 cannot interoperate with SR10 based 100GbE transceivers. A complex design with a reverse gearbox (4x25G to 10x10G) can achieve this but results in expensive and power hungry optics.

Breakout mode refers to running a 100G port as 4 separate channels of 25GE. Transceivers or copper cables that enable optical or electrical breakout allow one 100G QSFP100 port to connect to four physically separate 25G links. When breaking out a single 100G port to 4x 25G links, care must be taken to use the same Forward Error Correction (FEC) mode on both ends of the link to ensure link-up. JTOPTICS transceivers and copper cables that support 100G to 4x25G breakout are listed below.

The 100G-DR/FR/LR transceivers can be plugged into any JTOPTICS 100G QSFP port. The electrical connector interface is 4 x 25G NRZ – the same as all existing ‘legacy’ 100G QSFP modules. The optical output is a single wavelength (or “lambda”) 100Gbit/s PAM-4 optical signal. The 100G-DR/FR/LR modules include a gearbox chip to convert the 4 x 25G NRZ electrical signals to a 1 x 100G PAM-4 optical signal. This is in contrast to legacy QSFP100 modules (such as a CWDM4 or LR4 100G module), which have 4 x 25G NRZ optical wavelengths multiplexed onto one fiber.

The Arista CAB-Q-Q-100G is a high-performance 100G DAC (Direct Attach Copper) cable designed for seamless connectivity in modern networking environments. Featuring QSFP28 connectors on both ends, this passive twinax copper cable supports short-distance data transmission, typically up to 5 meters. It..
₹ 3,495.00
The Brocade 100G-Q28-Q28-C is a high-performance 100G DAC (Direct Attach Copper) cable designed for reliable connectivity in data-intensive networking environments. Equipped with QSFP28 connectors on both ends, this passive twinax copper cable is optimized for short-distance applications, typically ..
₹ 3,495.00
The Cisco QSFP-100G-CU is a high-performance 100G DAC (Direct Attach Copper) cable designed for efficient data transmission in networking environments. Featuring QSFP28 connectors on both ends, this passive twinax copper cable provides reliable connectivity for short-distance applications, typically..
₹ 3,495.00
The Dell DAC-Q28-100G is a high-quality 100G DAC (Direct Attach Copper) cable designed for seamless data transmission in high-performance networking environments. Featuring QSFP28 connectors on both ends, this passive twinax copper cable supports short-distance connections, typically up to 5 meters...
₹ 3,495.00
The Extreme 10411 is a high-performance 100G DAC (Direct Attach Copper) cable designed for efficient data transmission in demanding networking environments. Featuring QSFP28 connectors on both ends, this passive twinax copper cable is optimized for short-distance connectivity, typically up to 5 mete..
₹ 3,495.00
The HPE Aruba R3B52A is a high-performance 100G DAC (Direct Attach Copper) cable designed for efficient data transmission in networking applications. Featuring QSFP28 connectors on both ends, this passive twinax copper cable supports short-distance connectivity, typically up to 5 meters. It delivers..
₹ 3,495.00
The Juniper QFX-QSFP28-DAC is a high-performance 100G DAC (Direct Attach Copper) cable designed for efficient and reliable data transmission. With QSFP28 connectors on both ends, this passive twinax copper cable is optimized for short-distance connectivity, typically extending up to 5 meters. It off..
₹ 3,495.00
The Mellanox/Nvidia MCP1600-C is a high-performance 100G DAC (Direct Attach Copper) cable designed for reliable connectivity in advanced networking environments. With QSFP28 connectors on both ends, this passive twinax copper cable supports short-distance connections, typically up to 5 meters, ensur..
₹ 3,495.00
JTOPTICS 100G QSFP28 to 4x 25G SFP28 PCC (Passive Copper Cable), also known as Direct Attach Copper (DAC) cable or Twinax cable, provides robust connections between 100G Ethernet and 25G Ethernet systems. Each cable consists of four lanes each operating at data rates of up to 25Gb/s. The passive cop..
₹ 6,880.00
The HPE Aruba Q9S72A is a versatile 100G DAC (Direct Attach Copper) breakout cable designed for efficient connectivity in high-performance networking environments. It features a QSFP28 connector on one end that splits into four QSFP28 connectors, allowing seamless connections between a 100G device a..
₹ 6,880.00
The Mellanox/Nvidia MCP7F00-A is a high-performance 100G DAC (Direct Attach Copper) breakout cable designed for versatile connectivity in advanced networking environments. Featuring a QSFP28 connector on one end, it splits into four QSFP28 connectors, enabling efficient connections between a 100G de..
₹ 6,880.00
JTOPTICS® 100G QSFP28 AOC is a 4x25Gb/s active optical cable, which is designed for 100G Ethernet (100GbE) and InfiniBand FDR/EDR applications. They are composed of QSFP28 transceivers in both ends and OM3(OM4) multi-mode fiber cable. It has four channels in each direction with 100Gb/s total bandwid..
₹ 17,363.00
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