Troubleshooting Procedures
45
D3CM1604 DOCSIS 3.0 Cable Modem Administrator Manual
Table 5-1. Checking Basic Cable Modem Functions
The POWER and other LEDs are OFF.
1. Turn off the cable modem and then turn it on again to see whether the problem is
resolved.
2. Check that you are using the power adapter supplied with the cable modem.
3. Be sure the power cord is connected to the cable modem and to a functioning
power outlet.
4. Plug a working device, such as a lamp, into the power outlet to confirm that the
outlet is working.
5. Be sure the power outlet is not controlled by a wall switch that can inadvertently
remove power from the outlet.
The DS and US LEDs are OFF.
1. Be sure the Ethernet cable connections are secure at the cable modem and at the
computer.
2. Be sure that power is turned on to the computer connected to the cable modem.
3. Be sure you are using the Ethernet cable supplied with the cable modem or one
configured similarly to it.
Advanced Troubleshooting Procedures
Most advanced troubleshooting procedures fall into one of the following categories:
Physical - an underlying problem with cables, a bad cable modem, or similar hardware
problem. See page 45.
Configuration - a problem with the configuration of one or more of network components.
See page 46.
Software - a failure of one or more software applications, an undesired interaction
between two or more applications, or an undesired application that has been introduced
into the network. See page 49.
Troubleshooting Physical Network Problems
When you experience network troubles, start by checking the physical network devices and
connections. These problems are the most easily fixed and include:
Performing a thorough physical inspection of your network.
Checking that all hardware devices, including the cable modem, are plugged in and
physically connected to the network.
Making sure you are using the proper network cables (for example, not using a
crossover cable with a NIC that requires a straight-through cable).
Making sure all network cables are in good condition and well seated. Often, reseating
the cable into a connector is all that is required to ensure a firm connection.
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