Upstream RF Troubleshooting
Upstream RF Troubleshooting
Upstream RF Troubleshooting
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Group Delay vs. MER<br />
• QPSK typically<br />
requires a<br />
minimum MER of<br />
10~13 dB,<br />
depending on<br />
CMTS make/model<br />
• 16-QAM typically<br />
requires a<br />
minimum MER of<br />
17~20 dB,<br />
depending on<br />
CMTS make/model<br />
Courtesy of Holtzman, Inc.<br />
<strong>Upstream</strong> <strong>RF</strong><br />
<strong>Troubleshooting</strong><br />
© 2003, Cisco Systems, Inc. All rights reserved.<br />
16-QAM<br />
QPSK<br />
DOCSIS 200 ns/MHZ<br />
33
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