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SFP/SFP+ Question (GC728X to AX6000)
Hi all,
From what I understand, the SFP+ slots in the GC728X do not permit auto-negotiation when using an AXM765 SFP+ module. My question is, does that limitation originate in the AXM765 modu...
OK let me explain. The AXM765 SFP+ transceiver can work at:
- 2.5Gbps when inserted in a 2.5Gbps SFP port (garage)
- 5Gbps when inserted in a 5Gbps SFP port (garage)
- 10Gbps (30 meters) when inserted in a 10Gbps SFP+ port (garage)
To my knowledge, there is no such switch today with 2.5Gbps or 5Gbps SFP ports (garages). So basically, the AXM765 can only be used in a 10Gbps SFP+ port, on a switch like the GC728X. You can connect another 10GBASE-T device (switch, or host) to the transceiver using CAT6A wiring up to 30 meters, at 10Gbps only.
The SFP+ port will not be capable of 2.5Gbps or 5Gbps, so AXM765 is "forcing" you to connect from a 10GBASE-T host at 10Gbps speed.
If you want, you can use a regular 1Gbps SFP transceiver like the AGM734. In that case, the SFP+ port will automatically revert back to 1Gbps (because it's detected as a purely 1Gbps transceiver), and you will be able to connect to your router using Cat5E or better, but at 1Gbps speed.
I hope this helps!
Regards,
The point is that there is on neither on the fiber link nor on the SFP+ SR & LR optics - different from copper Ethernet we're so used to - no negotiation.
The GC728X Data Sheet says "• 2 x 10GBASE-X Dedicated SFP+ Fiber ports supporting 10G/1G speeds" - so if such a Multi-Gig SFP+ module doesn't work on the other speeds, nothing to complain.
An SFP+ port can support multiple speeds, however even Netgear's real Multi-Gig switches like the unmanaged XS505M/XS508M or the Smart Managed MS510TX show in the specs (and the data sheet) 1G/10GBASE-X SFP+. We've seen in some business grade devices that the SFP+ ports can be configured to auto negotiation resp an error message is thrown when auto-negotiation is on and a SFP+ optics module is plugged.
One could imagine that a Multi-Gig switch might be able to take such a module and might allow to run 2.5Gb or 5Gb and that it's simple not documented accordingly.
LaurentMa need your backing here - aware you are not the PLM for the Smart Managed Pro/Plus switches.
OK let me explain. The AXM765 SFP+ transceiver can work at:
- 2.5Gbps when inserted in a 2.5Gbps SFP port (garage)
- 5Gbps when inserted in a 5Gbps SFP port (garage)
- 10Gbps (30 meters) when inserted in a 10Gbps SFP+ port (garage)
To my knowledge, there is no such switch today with 2.5Gbps or 5Gbps SFP ports (garages). So basically, the AXM765 can only be used in a 10Gbps SFP+ port, on a switch like the GC728X. You can connect another 10GBASE-T device (switch, or host) to the transceiver using CAT6A wiring up to 30 meters, at 10Gbps only.
The SFP+ port will not be capable of 2.5Gbps or 5Gbps, so AXM765 is "forcing" you to connect from a 10GBASE-T host at 10Gbps speed.
If you want, you can use a regular 1Gbps SFP transceiver like the AGM734. In that case, the SFP+ port will automatically revert back to 1Gbps (because it's detected as a purely 1Gbps transceiver), and you will be able to connect to your router using Cat5E or better, but at 1Gbps speed.
I hope this helps!
Regards,
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