C3KX-NM-10G at 3750x in 1G mode

[slyfox]

Hello,

We cannot run C3KX-NM-10G at 1G mode for all 4 ports.
3750x recognize(can work) only with two 1G GLC-LH-SM SFP modules in the same time, what ever port are used G1 /G2 or G3/G4.

[Mark Malone]

Hi

These are the combinations you should be able to use 

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/hardware/install/notes/net_mod_note.html

[Mark Malone]

C3KX-NM-10G (Figure 2)

The module has four slots. Two slots support only 1-Gigabit SFP modules. Two slots support either 1-Gigabit SFP or 10-Gigabit SFP+ modules. Note The GLC-T SFP is not supported on the SFP+ slots of C3KX-NM-10G. The four slots are grouped as two pairs, with each pair consisting of one SFP slot and one SFP+ slot. Each pair supports either two 1-Gigabit SFP modules or one 10-Gigabit SFP+ module. A 10-Gigabit SFP+ module cannot operate at the same time as the corresponding 1-Gigabit SFP module in the pair.

[slyfox]

Hello Mark,

The Cisco guide was the first thing I did, but there is no an answer why module recognize only first two inserted sfp what ever port are used.

[Mark Malone]

Sorry i dont get what you mean its only supposed to support 2x1gb thats the way its designed , if you want a module that supports 4x1gb you need to use the 1g C3KX-NM-1G

[slyfox]

So, C3KX-NM-10G support only two 1G SFP connected same time per 4 ports?

But, what does it mean:

Supported combinations of SFP and SFP+ modules:
•Slots 1, 2, 3, and 4 with 1-Gigabit SFP modules
and
 The four slots are grouped as two pairs.Each pair supports either two 1-Gigabit SFP modules or one 10-Gigabit SFP+ module. 

[Mark Malone]

Yes i need to test it to be sure the doc is not that clear as it also says

The module has four slots. Two slots support only 1-Gigabit SFP modules

[slyfox]

Official Cisco integrator confirmed the possibility of using all four slots with 1G modules in the same time.