Chapter 4
Using the telephony modem
This chapter describes the controls and features available on your cable modem and covers
basic troubleshooting procedures.
Indicator lights for your cable modem
Your cable modem LED indicator lights can be helpful when troubleshooting.
Wiring problems
If your cable modem begins flashing all its lights for more than 10 seconds, this indicates a
problem with the telephone wiring — the red and green wires may be shorted (touching), or
there may be undesired voltage on the lines. If this pattern persists for more than 10
seconds, disconnect the telephone lines from your cable modem, replace the telephone
cable, or contact a wiring technician for assistance.
Patterns: normal operation
The following table shows light patterns during normal operation:
Mode
Power
US/DS
Online
Tel 1 / Tel 2
AC power
On
On = connected to the
Internet (ultra-high speed)
Flash = not connected to
the Internet
On = Internet avail
Off = Internet not
available
On = on-hook
Flash = off-hook
Off = disabled
SURFboard
®
SBV2402 Internet and Voice Cable Modem for Xfinity
®
customers User Guide STANDARD Revision x.3 22
Summary of Contents for ARRIS SURFboard SBV2402
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