Upstream RF Troubleshooting
Upstream RF Troubleshooting
Upstream RF Troubleshooting
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<strong>Upstream</strong> Integrity<br />
• Verify that the upstream digitally<br />
modulated carrier amplitude at the input to<br />
the CMTS upstream port is within spec<br />
<strong>Upstream</strong> <strong>RF</strong><br />
<strong>Troubleshooting</strong><br />
A typical value is 0 dBmV, but this may vary<br />
depending on the CMTS manufacturer’s specs<br />
and CMTS configuration<br />
• Check the upstream carrier-to-noise,<br />
carrier-to-ingress, and carrier-tointerference<br />
ratios<br />
DOCSIS assumes a minimum of 25 dB for all<br />
three parameters<br />
© 2003, Cisco Systems, Inc. All rights reserved.<br />
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