It has been confirmed by many users, along with Toshiba Tech Support, that this feature has been turned off by "factory default" once the Cable Modem has established an Internet connection between you and the head-end. For more detailed information, you can read through one of our archived threads (dates back to 2003) here: /forum/remark,8829913
This thread too: /forum/remark,9427096 which confirms by many using RR that the feature has indeed been disabled.
•Receive/Downstream: -15dbmV to +15dbmV •Transmit/Upstream: 30dbmV to 53dbmV •Signal to Noise Ratio(SNR): 33dB or Greater
Note: If your power levels are out of range, it can cause packet loss, re-transmissions which will eventually lead to speed loss; otherwise signals have nothing to do with your speed.
Open your Internet browser and enter the following into your address bar: »192.168.100.1
Note: When accessing your Modem's HTML interface you may be challenged for a "User name" and "Password". If so, the User Name is: root and Password: root. Not all these diagnostic screens will be present on all models.
Well, most modems these days have internal HTML interfaces which extracts Modem information to the viewer via Internet browser, and it's mostly thru the Modem's IP address: »192.168.100.1 It doesn't hurt to try on your modem.