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Forum Discussion
M4300 & NBASE-T
Hello,
I am using a M4300 as part of an NDI workflow. I am attempting to use a 10Gtek ASF-10G-T SFP+ in one of the 10G ports, connected to a TRENDnet TUC-ET2G 2.5G USB Ethernet adapter. I can get 2.5G link, but bandwidth seems very low. I am getting upwards of 700Mbps from the onboard Realtek NIC in a brand new Intel H310 / Core i7 based PC. On the USB NIC, even with one NDI stream, which is about 180Mbps, the stream is very laggy.
I am not sure if this has to do with the switch or if anyone has more experience with NBASE-T than I do to know where to look for improvements.
According to this document, the 10Gtek should support 2.5G. I don't think this is a USB bandwidth issue as it is on a USB 3.1 port, and this isn't exceeding or approaching the 5G limit of USB 3.1. This review also confirms the functionality.
Is there something in the switch I should be looking at as far as the poor performance? Internet and small packet transfers do work. I am not seeing any errors or discarded packets in the switch monitoring pages. I did notice that the switch says the link is negotiated at 10G and not 2.5G, but I am guessing that is due to the switch not being NBASE-T aware?
As far as configuration, flow control is enabled, jumbo packets are disabled, and EEE features are all disabled as per the NDI guidelines.
I realize Netgear doesn't support 3rd party SFPs.
4 Replies
To my knowledge, all M4300 Series SFP+ slots are spec'ed for 1G/10G only. On the SFP+ slot, there is no auto-negotiation - the speed must be the same from switch<->SFP+<-module-> ... <PC>, certainly for fiber link, and almost certainly for Base-T modules.
Only the M4300-16X (XSM4316PA, XSM4316PB) and the modular M4300-96X with the APM408C/APM408P modules are supporting direct and built-in MultiGig. On the M4300-16X this might have an impact on the SFP+ slots, but not sure.
LaurentMa svp. Vaguely remember you have replied to a similar question before, however I can't locate that thread.
Thank you, this is correct. Fiber SFP+ ports won't support anything else than 1G SFP transceivers/speed and 10G SFP+ transceivers/speed. There is no Multi-Gigabit Ethernet (2.5G speed or 5G speed) support on SFP+ ports, even on the M4300-16X or M4300-96X switches which offer Multi-Gigabit Ethernet on their 10GBASE-T copper (RJ45) ports.
I hope this helps, M4300 datasheet is detailing various speeds supported by every port very precisely page 3 (At a Glance section), and page 33 (Tech Spec section).
Regards,
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