QSFP: Difference between revisions
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In the world of network switching hardware (and to a lesser degree host [[NIC]]s), | In the world of network switching hardware (and to a lesser degree host [[NIC]]s), '''SFP''', '''QSFP''' and acronyms like it | ||
SFP, QSFP and acronyms like it describe a kind of physical slot that leaves the lowerst level of the [[network stack]], | 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 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, they just move 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). | ||
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'''A little more practically''' | '''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, | In hosts there is not a lot of difference between | ||
but in network switching hardware, the added flexibility (at | : 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. | 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). | QSFP is also hot-swappable (at physical layer, not all ''uses'' will be equally happy with you doing that). | ||
On the hardware side | On the hardware side | ||
* SFP (Small Form-factor Pluggable) | * SFP (Small Form-factor Pluggable) | ||
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* QSFP56 | * QSFP56 | ||
:: 200 Gbit/s, aimed at 200 Gigabit Ethernet, HDR InfiniBand, or 64G Fibre Channel | :: 200 Gbit/s, aimed at 200 Gigabit Ethernet, HDR InfiniBand, or 64G Fibre Channel | ||
Latest revision as of 18:47, 22 April 2024
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