Cisco QSFP-100G-AOC3M InfiniBand cable 3 m -001

Cisco QSFP-100G-AOC3M InfiniBand cable 3 m -001

QSFP28 Cable: FAQs

Q: What is the operating temperature range and the standard of QSFP28 cable?

A: Generally, the operating temperature range of 100G cable is 0°C to 70°C. The standards of the QSFP28 cable are shown below.

Q: What is the maximum transmission distance of QSFP28 cable?

A: 100G DAC cable can achieve over 5m, and 100G AOC cable can provide links up to 100m MMF.

Q: Can 100G QSFP28 cables be used for 40G?

A: Yes, QSFP28 cables can be used for 40G, but not vice versa. There is the rule about mixing optical transceivers at different speed: both ends of the two modules have to match and the form factor needs to match as well. Additionally, port speed needs to be equal or greater than the optic used.

Q: What does breakout mode of QSFP28 cable mean?

A: Breakout mode refers to running a 100G port as 4 separate channels of 25G or 2 separate channels of 50G. When breaking out a single 100G port to 4x 25G or 2x 50G links, Forward Error Correction (FEC) mode on both ends of the link must be the same to ensure link-up.

Q: Can customers use third party QSFP28 Cable?

A: Yes, third-party 100G passive copper cables can be used but all the cables are required to comply with the associated IEEE specifications, as well as SFF-8636 management interface / EEPROM specifications to allow them to be correctly identified and recognized by the switch/router.