Frequently Asked Questions
Understanding and Troubleshooting RF
What are some general RF plant troubleshooting rules?
How do I troubleshoot cable modems dropping offline?
How do I use the Cable Flap List to diagnose RF problems?
What are the DOCSIS Cable Upstream RF specifications?
What are the DOCSIS Cable Downstream RF specifications?
How do I measure the upstream RF signal (Zero span)?
How do I measure the downstream power signal from the MC-xx card?
How do I measure the downstream power signal from the upconverter output?
Why is it on GI upconverters the frequency must be set at 1.75 MHz less than the center frequency?
What is meant by "unity gain"?
What is the correlation between mini slots and channel width?
Helpful Troubleshooting Commands
What do the "Show Cable Modem" state mean?
What CMTS commands do I use to check the downstream?
What CMTS commands do I use to check the upstream?
What does the "*" and "!" mean for the power level reading on the "show cable modem" command?