Installation guide

Troubleshooting Infor mation 17
Patterns: Normal
Operation
The following table shows LED patterns for the TelephonyModem 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 = SlowFlash
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 SlowFlash =
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 TelephonyModem is online.
2. SlowFlash 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 TelephonyLEDs corre-
sponding to the line or lines where the fault was detected.
TM608 Installation Guide Release 6 Standard 1.0 December 2008