I have read that the Tablo ethernet port is 10/100. Is there any way to know if the port is running at 10 or 100? My Tablo is connected to an Ethernet switch, but the switch only shows a differentiation between 10/100 and 1000.
As long as you aren’t running a hub/switch/router that just has 10 Mpbs ports, the Tablo will run at 100 Mpbs.
Tablo should be running at 100. It isn’t capable of 1000 as you already know. I understand your switch only shows indications either of 10/100 vs 1000. So if it’s running at 10 you can’t tell because 1 light means either 10 or 100, the other light indicates 1000. That’s pretty common among switches.

Similar situation, have consumer grade 4 port switch that does not have any software to interrogate the ports. I’ve been mulling over why my Tablo Roku channel sometimes has trouble playing back 1080 content. Tablo 1080 content requires 10Mbps of bandwidth - which means it can work on a 10Mbps connection, but just barely - any glitch/slowdown and you’re out of business. Trying to see if there is a way to rule out the Tablo port speed as a cause. Maybe I can borrow a regular switch from work to actually test the port speed.
The other device on my 4 port switch is my Roku 2XS, added the SpeedTest channel and I can get about 25Mbps, so it’s definitely on a 100 connection. Have a 2-tuner Tablo.
Edit: It just occurred to me that I could try using a crossover cable to attach a laptop directly to the Tablo. I know I can’t do anything with the Tablo, but with the laptop I could at least see the port speed (speed negotiated between the two).
If you want to see if the problem is between the Tablo and the Roku, test the connection between a wired PC and the Tablo. You can install apps to see what sort of bandwidth your PC is using. Also watch the Tablo from multiple other devices; phone, pc, etc. If you can do that, then the Tablo is connected 100.
I had some minor issues until I changed my recording to the 720p Roku/Chromecast setting then all issues went away. Studies show that unless the TV is larger than 52" or so and you sit as close as 10’ or less, you won’t have a discernible difference between 720 and 1080. You have to have a large TV and sit relatively close for it to matter. That’s why Tablo put in the 720p Roku setting for recording - Roku and chromecast just don’t fair well with the other settings, and the majority of TV watchrs won’t notice.
@ShadowsPapa - agree with your suggestion on using 720, it’s what I ended up doing. Every so often I try 1080 to see if the issues are straightened out.
Hooked up a PC with a crossover cable to the Tablo. Could not get a link light when I set the adapter to 10Mbps full or half duplex. Link light did come on when set to 100Mbps full or half duplex. So from what I can see the port is running at 100Mbps.
That matches what I observe here as well.
Enjoy - the more I use this, the more they change and fix it and the more others here work on their scripts and such to help handle extracting and converting recordings, the more I love this beast.