This is a follow-up to my earlier post: https://community.cisco.com/t5/small-business-switches/need-cabling-advice-to-connect-c3750g48ts-and-sg300-20-using-sfp/td-p/3902730
After reading this:
10GBASE-LRM and EDC: Enabling 10GB Deployment in the Enterprise
... I'm beginning to re-think my choice of SFP modules. Because this is a home lab cost and distance are major consideration. The limitation is the SG300-20 and available SFP modules which can be summarized as:
1000BASE-BX-20U SFP transceiver, for single-mode fiber, 1310 nm wavelength, support up to 40 km
1000BASE-LH SFP transceiver, for single-mode fiber, 1310 nm wavelength, support up to 40 km
1000BASE-LX SFP transceiver, for single-mode fiber, 1310 nm wavelength, support up to 10 km
1000BASE-SX SFP transceiver, for multimode fiber, 850 nm wavelength, support up to 550 m
(Q1) I made the assumption that shorter maximum distance meant lower cost for both SFP modules and cabling. Is this correct in the case of SFP + cabling for the SG300?
(Q2) Will a MGBSX1 and SFP-10G-SR (https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-455693.html) work together?
(Q3) If the answer to Q2 is yes, is OM3 or OM4 my best choice for re-usability in 10G and lower cost?
(Q4) If the answer to Q2 is no, what do you recommend?
So then there is no way to mix 1G and 10G, i.e. 10G is not backwards compatible like with the older 10/100/1000M? I just want to make sure I'm crystal clear on that point.
Assuming that the answer to the above question is 'correct' it now becomes a question of will the MGBSX1 work with the GLC-T (https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/gigabit-ethernet-gbic-sfp-modules/datasheet-c78-366584.html)?
You can connect a 1G SFP to a 10G SFP+ module, providing the speed has been set to 1000. You cannot put a SFP module in a SFP+ slot and vice versa.
As for whether a MGBSX1 will work with a GLC-T, they will not. They use different transmission media, ie fibre and UTP.
If you want a really short 10G run, have you considered Twinax cables? This only go to a maximum of 10 metres and a comparatively extremely cheap!
Quoting from my first post in this thread:
"Because this is a home lab cost and distance are major consideration. The limitation is the SG300-20 and available SFP modules which can be summarized as..."
(Q1) Of the four, actually eight, SFP modules available for the SG300 I had assumed that the "MGBSX1" would be the cheapest. Is this a correct assumption?
(Q2) On the C3750G48TS side I could use a "GLC-SX-MMD" (https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/gigabit-ethernet-gbic-sfp-modules/datasheet-c78-366584.html) to match the "MGBSX1". Is this a correct assumption?
Don't ask me where the idea to use the "GLC-T" came from. Even I know you can't mix copper and optical. Sheesh.
(Q3) The real question is: is there a 10 Gbps module that I can use on the C3750G48TS that will play nice with the MGBSX1 at the other end? The reason for asking is if/when I get rid of the C3750G48TS and replace it with 10G hardware it would be nice to re-use the module.