I'm guessing, but I think has to do with the gateway ID/outroute. I'm on J2 San Diego - beam 68.
I'll take a swag and say Lost Wages Nevada, Beam 79.
The first three letters after the J2 (or J1). Your gateway is in North Las Vegas.
SDO is San Diego
"FYI, your gateway is in San Diego, as is evidenced by the SDO after the J2 in your IP Gateway Association State. It's just good to know as it can help if ever your system starts having a short term issue, as you can see if there is any inclement weather in San Diego. "
I didn't see this before asking about SDO.
Usually pretty good weather there as well in LA. Worst you'd see is some morning marine layer clouds, but they burn off between 10 PT, noon PT tops.
What's key is the beginning of the gateway string:
Jn = Jupiter sat number, starting with "J"
G = Gateway location trigraph
b = beam number