Ethernet connection loss on mac studio

10Gb Ethernet:

"energy efficient" drops power to the 10Gb Ethernet chip to save energy. It is NOT compatible with Top Speed. In the hardware pane, under Duplex, set: “Full-Duplex, Flow Control” NOT “Full-Duplex, Flow Control, power efficient” to disable power saving and boost top speed.

The Mac Studio has a 10Gb Ethernet port. This 10G Ethernet port is NOT compatible with speeds slower than ONE-Gigabit Ethernet. It is also NOT compatible with cables that have fewer than all four pairs available for data (NO power-over-Ethernet allowed.)

If you have some fancy equipment at the other end of the cable, it is possible it is trying to make a 10Gb connection. A 10Gb (or 5Gb or 2.5Gb) connection is only stable when cables are excellent and fairly short (like Category-6 rated cables under 100 feet). If either of those are not true, or you have you added patch cables that are not Category-6 rated, you could be seeing it connect at a faster-than-Gigabit speed, then error out and disconnect.

The setting [√] ABV/AEV mode   selected on the hardware pane of advanced Wi-Fi or Ethernet OR in your Router may constrain the connection in unexpected ways that could limit overall performance. The feature is used ONLY for prioritizing video streams.

MrHoffamn--

you are right in every case EXCEPT that the Mac Studio Spec explicitly says, "no 100 M Bits/sec Ethernet"

Ethernet

• 10Gb Ethernet (Nbase-T Ethernet with support for 1Gb, 2.5Gb, 5Gb, and 10Gb Ethernet using RJ-45 connector)

Mac Studio - Technical Specifications - Apple

Note the missing speeds lower than 1 Gbits.

Above is correct, save for a detail or two.

Per Apple, the 10GBASE-T (10 GbE) port is compatible with 100BASE-T (100 MbE), given a Cat 5e or Cat 6 cable.

Details: About the 10 Gigabit Ethernet port on Mac - Apple Support

The port should also work with 10 GBASE-T capable PoE switch, too.

And yeah, older patch cables and older wiring won’t necessarily play very well with 10 GbE. For reliable 10 GbE, Cat 5e+ (350 MHz), or Cat 6, or better is needed. (Yeah, Cat 5e+ 350 MHz isn’t part of a standard, but various vendors were selling that before 5e solidified at 100 MHz. I installed a lot of it, too.)

Mac Pro tower 2023 as well:

Two 10Gb Ethernet ports

• 10Gb Ethernet (Nbase-T Ethernet with support for 1Gb, 2.5Gb, 5Gb, and 10Gb Ethernet using RJ-45 connector)

I think they chose not to support sub 1 Gigabit baseband (two pair cables) at all.

Actual Speed:

The good way to check the actual connection speed USED to be Network Utility, But in Catalina and later, Apple has deprecated Network Utility and now you have to use a Terminal command to see your actual connection speed. First, you need to know what en number the link is. then you use a command like this one, substituting the actual en number.

my main Ethernet connection uses BSD name en2 (as shown in) :

 menu > about this Mac > (system report) > network:

Aquantia AQC107-B0:

Name: ethernet

Type: Ethernet Controller

Bus: PCI

Slot: Slot-3

Vendor ID: 0x1d6a

Device ID: 0x87b1

Subsystem Vendor ID: 0x1d6a

Subsystem ID: 0x0001

Revision ID: 0x0002

Link Width: x4

BSD name: en2

Kext name: AppleEthernetAquantiaAqtion.kext

Location: /System/Library/Extensions/IONetworkingFamily.kext/Contents/PlugIns/AppleEthernetAquantiaAqtion.kext

Version: 1.0.64

Terminal command:

ifconfig en2 | grep media

with this as my output for 10 Gigabit Ethernet:

media: 10Gbase-T <full-duplex,flow-control>

For ‘regular’ Gigabit Ethernet, you should get this instead:

media: 1000baseT <full-duplex,flow-control>

Errors detected:

To see if an Ethernet link is throwing more than a handful of initial errors, you can use Terminal command:

netstat -I en5

This is the resulting output. Counters are In-packets, In-errors, Out-packets, Out-Errors, Collisions. There should never be more than handful of errors from starting up, and in most cases, NONE.

Name       Mtu   Network       Address            Ipkts Ierrs    Opkts Oerrs  Coll

en5   8163  <Link#4>    00:01:d2:1a:00:dd   696697     0   484301     0     0

en5   8163  grantsmacpr fe80:4::461:ea0d:   696697     -   484301     -     -

en5   8163  192.168.0/23  192.168.0.204     696697     -   484301     -     -

If the link were running beyond its ability to run and be stable, for example it auto-speeded to 10Gb but the cabling could only reliably support 2.5Gb, we would see non-zero errors counts, and errors increasing over time. (and possibly, disconnecting)

Interesting. Conflicting documents from Apple. Nit the first time that’s happened. Bug logged.