Touchstone TM402 Telephony Modem User’s Guide
47
Getting
Battery
USB
Ethernet
Safety
Started
Installation
Installation
Drivers
Configuration
Usage
Troubleshooting
Glossary
LED Indicators: Startup Sequence
The following table shows the Telephony Modem light patterns during each phase
of the startup sequence. There are two phases of startup; the Telephony phase and
the cable modem phase. Both are outlined below.
Cable Modem Start Up Sequence
Power,
DS, US,
Online
Link
Telephone
Battery*
Description
1
2
1
2
Off
Off
Off
Off
Off
Off
No power to Cable Modem
Flash
Flash
Flash
Flash
Flash
Flash
Power-on Self Test**
See “Cable Modem Start Up Sequence” Below
On
On
Flash
Off
Off
Off
Retrieving telephone network
information
On
On
Off
Flash
Off
Off
Retrieving telephone line information
ON
On
Flash
Flash
Off
Off
Activating telephone service
Normal Operation
* = Battery LED only applies to those models with battery backup
** = If this pattern of all LEDs flashing persists, the Telephony Modem has detected foreign voltage
on the telephone line. Disconnect the telephone connection and call a qualified telephone installer to
troubleshoot.
Power
DS
US
Online
Description
On
Flash
Off
Off
Downstream search
On
On
Flash
Off
Downstream found, upstream search
On
On
On
flash
Downstream and Upstream found,
retrieving setup information from cable
operator
CM Normal Operation
