QSFP: Difference between revisions
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In the world of network switching hardware (and to a lesser degree host [[NIC]]s), '''SFP''', '''QSFP''' and acronyms like it | |||
describe a kind of physical slot that leaves the lowerst level of the [[network stack]], | |||
the PHY translation, up to the thing that slots in. | |||
The switch-transciever connection is OSI layer 1 - they move data, they are protocol-agnostic (they don't inspect it). | The switch-transciever connection is OSI layer 1 - they move data, they are protocol-agnostic (they don't inspect it, they just move it). | ||
This means that with the right transceiver, it supports | This means that with the right transceiver, it supports | ||
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'''A little more practically''' | |||
In hosts there is not a lot of difference between | |||
: a SFP card plus specific PHY, and | |||
: a card that happens to have that PHY on its board, | |||
but in network switching hardware, the added flexibility (at some extra cost) can save so much headache and, in ''some'' situations, money. | |||
Around switches, seeing the acronym may mean "aside from 1gbit or 10gbit ports, it also has one or two SFP style slots that leave it open how you connect that to the rest of your infrastructure" (e.g. optical/copper variants of 10GBASE or faster, 40gbit) | |||
Only in a limited number of cases would you want to opt for a switch that consists of ''primarily'' unpopulated SFP style slots. | |||
QSFP is also hot-swappable (at physical layer, not all ''uses'' will be equally happy with you doing that). | |||
On the hardware side | |||
* SFP (Small Form-factor Pluggable) | * SFP (Small Form-factor Pluggable) | ||
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* QSFP+ | * QSFP+ | ||
** | ** Typically 40Gbit max, mainly aimed at four 10 Gbit/s channels, 10GFC FiberChannel, or QDR InfiniBand, sometimes a single 40GBit Ethernet link | ||
50 Gbit/s | * QSFP14 | ||
:: 50 Gbit/s, aimed at FDR InfiniBand, SAS-3, 16G Fibre Channel | |||
100 Gbit/s | * QSFP28 | ||
:: 100 Gbit/s, aimed at 100 Gigabit Ethernet, EDR InfiniBand, 32G Fibre Channel | |||
200 Gbit/s | * QSFP56 | ||
:: 200 Gbit/s, aimed at 200 Gigabit Ethernet, HDR InfiniBand, or 64G Fibre Channel | |||
Latest revision as of 18:47, 22 April 2024
✎ This article/section is a stub — some half-sorted notes, not necessarily checked, not necessarily correct. Feel free to ignore, or tell me about it.