Troubleshooting Infor mation
17
Patterns: Normal
Operation
The following table shows LED patterns for the Telephony Modem during
normal operation.
Operating
Mode
Po wer
DS
US
Online
Link
Tel. 1 – 8
On =
On =
On = CPE On-hook
network connected
On =
On =
available
Flash
=
Online Online
Off = CPE Off-hook
AC Power disconnected
Good
Flash
=
Flash
=
Off =
Slow Flash
2
=
Off-line Off-line network Line card
not
Flash
= CPE error
available activity
1
Off =
disabled
On
On =
On-hook
Flash
=
Off-hook
AC Power
Fail Slow Flash =
Line card
error
Off =
disabled
Flash
Off
Off
Off
Off
Firmware
Upgrade
x
3
Flash
Flash
On
x
x
Line Card
Flash Flash
Flash Flash
Flash Flash
Protection
State
4
Off
Off
Off
Off
Off
(line)
1. This state is valid only if the Telephony Modem is online.
2. Slow Flash is 1 flash per second.
3. An x indicates the LED state reflects the ‘‘A C Power Good’’ or ‘‘A C Power Fail’’ status.
4. Line Card Protection indicates foreign voltage present on one or more lines. In this state,
the LED pattern alternates between all LEDs flashing and only the Telephony LEDs corre-
sponding to the line or lines where the fault was detected.
TM608 Installation Guide Release 6 Standard 1.0 December 2008
