Cisco DPC2203C Installation And Operation Manual page 62

Chapter 4 Troubleshooting the Installation
4 Is the upstream level or the ratio outside of the operating range?

If yes, correct the upstream channel to the cable modem.

If no, go to step 5.
5 Check the status of the CMTS.
Check the status of the CMTS signal on the node attached to the cable modem.
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