Ethernet Port on Mac Studio only 100 mbps after power surge

I have multiple suggestions about how to debug YOUR issue.

But you camped on an unrelated post about a Mac that has completely different Ethernet setup.

if you start a NEW discussion, the next time someone is searching, facing a similar issue, they will find YOUR discussion.

The Ethernet port on the Mac studio does NOT support Baseband Ethernet at 100 M bits/sec.

The Mac Studio uses ONLY a modulated signal transmitted on cables with all four pairs of wires and its slowest speed is 1 G bits/sec. Cables with only two pairs of wires will fail to connect.

from AppleSpec:

Ethernet

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

Those options are for other models of Macs. that are grayed out on your pages, because they are not supported.

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>

As far as the Ethernet port being replaceable, a teardown video shows someone removing a small circuit board that has the jack mounted on it. If the lightning strike only fried that board, and not circuitry deeper in the Mac Studio, it might be a relatively simple repair (apart from opening up and putting back together the Mac Studio!).

I think your best bet is to tell Apple what happened and ask them for a repair estimate. I could be wrong, but I think they might give you a repair cost estimate for free, at which point you could make a decision as to whether to fix the port, or to live with it being dead.

my recollection is M1 mini has OPTIONAL 10 G Ethernet port. Default is 1 Gigabit speeds, but only works if the cables have all four pairs, wired correctly.

Did you pay for the upgrade to 10G? Did it ever work at 10 G?

Because the title of this thread is "Ethernet Port on Mac Studio only 100 mbps after power surge" and that is what happened to my mac mini and I wanted to see if the OP had ever resolved it or had it get it replaced.

If I could have direct messaged OP I would have, but instead I responded to his post to see if he found resolution. Have you considered just not responding since I didn't address you and you don't know the answer?

Then why are you posting here?

Please start new discussion with a title that will attract the readers you think can help you!

Start a NEW discussion

Did you ever find a solution for this? My Mini M1 is currently only reading 100Mbps similar to your situation.

I think you misread. I am getting 100mbps, instead of 1GB, like OP said. I was getting 1GB for over a year before suddenly it registering as 100mbps. Nothing to do with the optional 10G port.

Do you have a Mac studio?

Readers who know MacBook Pro will shun this discussion.