said by GeekGirl1 :

I haven't looked at the diagnostic menu since I've had Comcast, so it's about time to dig into it for Verizon FiOS. (Thanks to knarf829 for the access code: »Line Attenuators)

With your STB powered on, hit "Power, Select, Select" quickly in sequence from the front panel. Don't use your remote. To exit the menu, hit "Power" to turn off the STB. The next power up will be back to normal.

The setup menu is where you configure the display, 4:3 override, HDMI settings, etc. is accessed by hitting "Power, Select, Menu". That's different than the diagnostic menu described here.

This menu is how your STB tells you what's going on. Everything from signal quality to channel encryption status to it's IP address and who it's talking to over the MoCA ethernet. The Line Attenuator thread contains a link that describes what the screen looks like and how to find SNR and AGC: »cjhengineering.com/hdtv/cablehdt···diag.htm. However, it's old and Verizon's menu contains additional entries.

I don't think you can hurt anything as this menu doesn't allow for user entry. Read-only. I think...

D06 Current Channel Status: Displays details about the flags used to set copy protection. Those interested in recording over firewire may want to visit AVS forum to understand the CCI and other bits to determine if a program can be copied / recorded: »www.avsforum.com/avs-vb/showthre···page=148. The menu shown in the link above is old.

D16 Connected Home: Page 4 (scroll up/down) shows the STB's TX data rates, in Mbps. I think it might be useful for those with home media DVRs that transfer their videos around the house. I don't know, as I don't have one. But it looked interesting. My data rate is around 230 Mbps.

D11 Interface Port Status: You can find the display EDID data here. It's a map of supported video resolution formats. Helpful for debugging 480i vs. 480p vs. 720p vs. 1080i.

D03 OOB Status: Out Of Band, meaning this is the RF channel for the program guide. 75.25 MHz.

D04 Inband Status: The status of the current channel. Select the channel of interest, then access the diagnostic menu. The menu will report the channel it's currently tuned to.

Note: Be careful to note which tuner is in use. My HD-DVR has 2 tuners, the current channel was on Tuner 2, not Tuner 1. I did not enter the diagnostics menu while it was recording as I didnt' know what would happen and didn't want to risk lose anything.

I checked the SNR, AGC, and correctable errors for a few channels. SNR is >37 dB, AGC "Good", 0 errors. Helpful if you have pixelation errors (those that are not from Verizon) or lose a channel. I mapped a few channels:

Channel       Name              Frequency   Modulation
    75     Versus SD             795 MHz     256-QAM
   829     Comcast Sportsnet-HD  639 MHz     256-QAM
   833     HDNet                 501 MHz     256-QAM
   846     Discovery HD          669 MHz     256-QAM

Knowing the right frequency is very helpful if you think you are having signal problems. Like if you are having a problem on a channel at 800 MHz and not having problem at 100 MHz, check your coax. Or, if you are using a QAM tuner without an STB, you could map frequencies to channels and see why your QAM tuner won't decode a channel.