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How can I tell if my cable modem is functioning properly?

How can I tell if my cable modem is functioning properly?

Depending on the modem model you have, there are two different light patterns to determine connectivity (lights may be in a different order). Lights highlighted in bold indicate cable network connectivity.

Pattern 1

Power: Solid
Cable: Solid
PC: Solid
Data: Flashing
Test: Off

Pattern 2

Power: Solid
Downstream (DS): Solid
Upstream (US): Solid
Online: Solid
Link: Solid/Flashing

Toshiba PCX1100/PCX1100U

Front Panel (Top to Bottom)
o Power: Solid
o Cable: Solid
o PC: Solid
o Data: Flashing
o Test: Off

Rear Panel (Top to Bottom)
o Ethernet 10/100
o USB (Not Supported)
o DC Power In
o RF/Coax In

Toshiba PCX2500/PCX2600

Front Panel (Top to Bottom)
o Cable: Solid
o PC: Solid
o Data: Flashing
o Test: Off
o Power: Solid

Rear Panel (Top to Bottom)
o Ethernet 10/100
o USB (Not Supported)
o RF/Coax In
o DC Power In

Terayon TJ-715x

Front Panel (Top to Bottom)
o Power: Solid
o Cable: Solid
o PC: Solid
o Data: Flashing
o Test: Off

Rear Panel (Top to Bottom)
o RF/Coax In
o DC Power In
o USB (Not Supported)
o Ethernet 10/100

Arris CM550

Front Panel (Right to Left)
o Power-Solid
o DS-Solid
o US-Solid
o Online-Solid
o Link-Solid/Flashing (Flashing when data is being passed)

Rear Panel (Right to Left)
o RF/Coax In
o Ethernet 10/100
o USB (Not Supported)
o DC Power In

Arris TM-402G

Front Panel (Top to Bottom)
o Power: Solid
o DS: Solid
o US: Solid
o Online: Solid
o Link: Solid/Flashing (Flashing when data is being passed)

Rear Panel (Left to Right)
o RJ11 In
o USB (Not Supported)
o DC Power In
o Ethernet 10/100
o RF/Coax In

Motorola SBG900

Front Panel (Top to Bottom)
o Power: Solid
o Receive: Solid
o Send: Solid
o Online: Solid
o PC/Activity: Solid/Flashing (Flashing when data is being passed)
o Wireless: Solid (Only if wireless connectivity is enabled)

Rear Panel (Top to Bottom)
o Ethernet 10/100
o USB (Not Supported)
o RF/Coax In
o DC Power In

Motorola SBG901

Front Panel (Top to Bottom)
o Power: Solid
o Receive: Solid
o Send: Solid
o Online: Solid
o Wireless: Solid/Flashing Green/Amber (Designates activity as well as if connection is encrypted or not)

Rear Panel (Top to Bottom)
o Ethernet 10/100
o RF/Coax In
o Reset button
o DC Power In