mmh, I would advice the 3560 series. For example WS-C3560G-48TS.
The question is what you (or the customer) wants. Low cost solutions mostly offers low flexibility/scalability...especially monitoring.
But don't forget the proportion between the Access Layer and the Backbone. Offering 1GB at the Access-Layer normally leads to the need of 10 GB at the Backbone(Proportion 1:10). Sure the users won't use the whole bandwith at their ports but 48 GB ports -> share <- 1 GB Uplink or a 4 Gig Uplink (Etherchannel).
Lets say you have got 3 buildings you want to link , with 500 users in each building.
and you want to use fiber interlinks ( good choice).
your core switch`s will need 2 FB links to the core. that all 3 building in a triangle.
Or just two building connected for redundency.
Then lets say you want to connect each access switch to the core/dist
500 users is about 11 switchs .
Each access switch needs dual links .
So you now have 20 fiber cables that need connecting...
the 3750/3560 come with a max of 4.
so straight away your into a chassis based switch
i think a 4503 with a 24 port SFP card will suffice.
if you can use TP to connect each access switch , then you can use a 3750G which will give you GIG for each access switch.
As for Voip , please be aware that if you load a 3560 or 3750 with 48 phones requiring power , there are known issue with provding power to all of them , i also noticed when testing that 30+ simultanious phone calls caused "buggy" type behaviour to be seen by the 3560`s , i believe due to overheating of the switch/Brown-out type behaviour.
For your clients , you still dont really need more than 100mb, your average desktop users doesnt go above that.
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