Will a Cisco 10G DAC (SFP-H10GB-CU3M) or a Finisar 10G optic work in a Netgear M5300 1G SFP port?

Question

All 10G ports on a Netgear M5300-28G3 were used, so the poster asked whether a Cisco 3 m SFP+ DAC (H10GB-CU3M) or Finisar FTLX8571D3BCL 10G SR modules could be used in the switch's 1G SFP ports to add another 10G-capable device at reduced speed. Hardware involved: Netgear M5300-28G3, Cisco SFP-H10GB-CU3M DAC, Finisar FTLX8571D3BCL.

Hardware: Netgear M5300-28G3
Transceivers: Cisco SFP-H10GB-CU3M DAC, Finisar FTLX8571D3BCL
Form factor: SFP, SFP+, DAC

Symptoms / messages:

10G DAC in 1G port
speed mismatch

nethawk74 · Accepted Answer

10G DACs and 10G optics are single-speed and will not run at 1G; thee is no such thing as a 1G DAC, so use two 1G optical transceivers with a fibre patch codr.

laserops32 · Answer

Cisco SG500 stacking ports can run such cables at other speeds, but that's a special case.

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