QSFP28 100G PinOut Guide
Welcome to our QSFP28 100G PinOut guide! This resource is designed for network engineers, hardware designers, and anyone interested in understanding the intricacies of QSFP28 100G connectors. You’ll find into on the functionality and usage of each pin in the QSFP28 connector.
QSFP28 100G Pin Description Table
Below, we provide a detailed overview of each pin’s function in the QSFP28 100G connector:
| Pin | Name | Description | Logic | Note |
|---|---|---|---|---|
| 1 | GND | Ground | 1 | |
| 2 | TX2n | Transmitter Inverted Data Input | CML-I | |
| 3 | TX2p | Transmitter Non-Inverted Data Output | CML-I | |
| 4 | GND | Ground | 1 | |
| 5 | TX4n | Transmitter Inverted Data Input | CML-I | |
| 6 | TX4p | Transmitter Non-Inverted Data Output | CML-I | |
| 7 | GND | Ground | 1 | |
| 8 | ModSelL | Module Select | LVTLL-I | |
| 9 | ResetL | Module Reset | LVTLL-I | |
| 10 | VccRX | +3.3V Power Supply Receiver | 2 | |
| 11 | SCL | 2-Wire Serial Interface Clock | LVCMOS-I/O | |
| 12 | SDA | 2-Wire Serial Interface Data | LVCMOS-I/O | |
| 13 | GND | Ground | 1 | |
| 14 | RX3p | Receiver Non-Inverted Data Output | CML-O | |
| 15 | RX3n | Receiver Inverted Data Output | CML-O | |
| 16 | GND | Ground | 1 | |
| 17 | RX1p | Receiver Non-Inverted Data Output | CML-O | |
| 18 | RX1n | Receiver Inverted Data Output | CML-O | |
| 19 | GND | Ground | 1 | |
| 20 | GND | Ground | 1 | |
| 21 | RX2n | Receiver Inverted Data Output | CML-O | |
| 22 | RX2p | Receiver Non-Inverted Data Output | CML-O | |
| 23 | GND | Ground | 1 | |
| 24 | RX4n | Receiver Inverted Data Output | CML-O | |
| 25 | RX4p | Receiver Non-Inverted Data Output | CML-O | |
| 26 | GND | Ground | 1 | |
| 27 | ModPrsL | Module Present | LVTTL-O | |
| 28 | IntL | Interrupt | LVTTL-O | |
| 29 | VccTX | +3.3V Power Supply Transmitter | 2 | |
| 30 | Vcc1 | +3.3V Power Supply | 2 | |
| 31 | LPMode | Low Power Mode | LVTTL-I | |
| 32 | GND | Ground | 1 | |
| 33 | TX3p | Transmitter Non-Inverted Data Input | CML-I | |
| 34 | TX3n | Transmitter Inverted Data Output | CML-I | |
| 35 | GND | Ground | 1 | |
| 36 | TX1p | Transmitter Non-Inverted Data Input | CML-I | |
| 37 | TX1n | Transmitter Inverted Data Output | CML-I | |
| 38 | GND | Ground | 1 |
Notes:
- GND is the symbol for signal and supply (power) common for QSFP28 modules. All are common within the QSFP28 module, and all module voltages are referenced to this potential unless otherwise noted. Connect these directly to the host board signal common ground plane.
- VccRX, Vcc1, and VccTX are the receiving and transmission power supplies and shall be applied concurrently. VccRX, Vcc1, and VccTX may be internally connected within the QSFP28 transceiver module in any combination. The connector pins are each rated for a maximum current of 1000 mA.
We hope this QSFP28 100G PinOut guide has enhanced your understanding of the QSFP28 pins. Whether you’re a network engineer or a hardware designer, this comprehensive breakdown will assist you in your projects and designs. Should you have any further questions or need additional resources, feel free to explore our other materials or contact our support team. We’re here to help with your network needs.
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100G QSFP28 Optical Transceivers
Welcome to our collection of 100G QSFP28 transceivers! The 100G QSFP28 optical transceiver are designed according to SFF-8665 standard which specifies QSFP+ 28 Gb/s 4X Pluggable Transceiver Solution (QSFP28) for 100 Gigabit Ethernet. 100G QSFP28 transceivers have the exact same footprint as it’s predecessor 40G QSFP+, but has variations where modules can have NRZ modulation (100G SR4, LR4, ER4, ZR4…) and there are some newer generation 100G QSFP28 Single Lambda modules (100G LR1, FR1, DR1) which use PAM4 modulation (more on PAM4 vs NRZ). We offer a wide range of optical modules tailored to diverse networking environments to cover all industry needs. Some of our most popular 100G modules are the 100G QSFP28 SR4 (PN: 100G-QSFP28-100) designed for short range (below 150m) Multi-Mode Fiber connections, 100G QSFP28 LR4 (PN: 100G-QSFP28-10) designed for long range (up to 10km) Single-Mode Fiber connections and 100G QSFP28 ER4 (PN:100G-QSFP28-40) designed for long range (up to 40km) Single-Mode Fiber connections. To help engineers find the correct units for their setup, we’ve sorted our 100G QSFP28 transceivers in the categories below based on their type and functionality. Not only do we offer a wide range of MSA compatible modules, but all of them can be re-programmed to be compatible with a wide range of devices. From industry-standard solutions to specialized modules, find the perfect fit for your network requirements.