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QSFP28 100GbE

QSFP28 carries 100GbE using four 25 Gbps lanes. Used in data center top-of-rack switches and 100G routers with SR4, LR4, and CWDM4 optical variants.

// Specifications
Standard
SFF-8665 IEEE 802.3bm
Speed
100 Gbps 4x25 Gbps
Lanes
4 TX and 4 RX
Hot Plug
Yes
Use Case
100GbE data centers
// Pin Reference Table
Pin Name Function Type
1 GND Ground GND
2 TX2n TX lane 2 negative BUS
3 TX2p TX lane 2 positive BUS
5 TX4n TX lane 4 negative BUS
6 TX4p TX lane 4 positive BUS
8 MOD_SEL# Module select I/O
9 RESET# Module reset I/O
10 VCC_TX TX supply 3.3V PWR
11 SCL I2C clock BUS
12 SDA I2C data BUS
14 RX3p RX lane 3 positive BUS
15 RX3n RX lane 3 negative BUS
17 RX1p RX lane 1 positive BUS
18 RX1n RX lane 1 negative BUS
20 ModPrsL Module present active low I/O
22 VCC_RX RX supply 3.3V PWR