The GBIC Connection of Cisco WS-C2960S-24PS-L

The GBIC Connection

Need to terminate two fibres and use two gbics on each end and that this is due to how single-mode gbics/fibres work (and in this particular case its single-mode being used, not multi-mode)

The whole point behind this is that we're going to connect a "main-cabinet" to two "sub-cabinets", and we are trying to figure out if a WS-C2960S-24TS-L has sufficient "gbic-room" to connect the four WS-C2960S-48TS-L's (two in each "sub-cabinets")

1 The bottle neck would not be the 24TS-L itself, but speed of the up-links to the 24TS.
For each 48TS-L you will have up to 48 devices connect at 1 Gbps, that all are going to try and go over the same single 1 Gbps up-link to the 24TS-L.
The only way to remove that bottle neck would be to ether get new switches that allow for  10 Gbps up-links or run multiple 1 Gbps links in a Etherchannel setup.

2 "Is the right gbic to use this one: GLC-LH-SM=   ?"

Yes, but make sure the installed fiber is "single mode"  That gbic will NOT work with "multi mode" fiber

"And each one of these gbic takes 2 stands of fiber?"

 Yes

"How would you lay fibres in such a setup?"

I would give each 48TS a connection straight back to the 24TS.  I would not connect the 48TS's to each other.  That runs the risk of creating a spanning-tree loop, which could take down the network.

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