Questions tagged [40g]

For questions about 40 Gigabit Ethernet in relation to professional Networking. For instance, you are designing a new campus and want to use 40G in your backbone, but have questions about the technology or how to configure it.

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Can I use a 40G transceiver in a QSFP56 NIC to connect to a 10G transceiver/switch if the NIC supports 10G speeds?

We're purchasing new servers that have Mellanox ConnectX 6 network cards in them, which accept QSFP56 transceivers. The card says it supports 10/25/40/50/100/200G. However, our switching backbone is ...
15 votes
3 answers

Serialization and serialization times in 40G/10G and 100G/25G Ethernet

I've recently been involved in discussions about lowest-latency requirements for a Leaf/Spine (or CLOS) network to host an OpenStack platform. System architects are striving for the lowest possible ...
5 votes
1 answer

Must 40/100G uplink ports on a 10G switch be connected to another switch?

I'm looking at a switch like this: It has 48 10-GbE SFP+ ports and 6 40-GbE uplink ports. I would like to use some of these uplinks to cross-connect to another ...
2 votes
1 answer

QSFP BiDi 40GB with two LC-LC

This Cisco module QSFP-40G-SR-BD is Bi-Directional (BiDi) 40Gbps QSFP, which means a single link used for RX & TX, each link 20Gbps, two LC links in total gives 40Gbps connection. If we will use ...