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239 H4R Installation and Maintenance Practice
7.
FRONT PANEL LEDS
The ADTRAN 239 H4R provides front panel LEDs to display status information. See
front panel LEDs and their indications.
Unit
Label
LP1/LP2
NET
239 H4R
1223445L1
LP1
NET
LP2
LP1
CUST
LP2
LL RL
/
(Y) (G)
LP1/LP2
CUST
LL/RL
61223445L1-5D
Table 6. Front Panel LEDs
Indication
! Off
Solid Green
"
4
Fast Flashing Green
4
Slow Flashing Green
"
Solid Yellow
4
Flashing Yellow
Solid Red
"
4
Flashing Red
! Off
Solid Green
"
4
Fast Flashing Green
4
Slow Flashing Green
Solid Yellow
"
4
Flashing Yellow
Solid Red
"
4
Flashing Red
Solid Yellow
"
4
Flashing Yellow
"
Solid Green
Description
No span power is present
Synchronized with an Signal to Noise Ratio (SNR) margin greater than
the recommended SNR Margin Alarm Threshold
(Flashing 3 times per second) Attempting to synchronize with the
H4TU-C
(Flashing once per second) Synchronized with a SNR margin greater
than the recommended SNR Margin Alarm Threshold, and the attenua-
tion is greater than the user recommended Loop Attenuation Alarm
Threshold
Synchronized with a SNR margin greater than 0 dB but less than the
recommended SNR Margin Alarm Threshold
Synchronized with a SNR margin greater than 0 dB but less than the
recommended SNR Margin Alarm Threshold, and the attenuation is
greater than the user recommended Loop Attenuation Alarm Threshold
Synchronized with a SNR margin of 0 dB
(Flashing once per second) Synchronized with a SNR margin of 0 dB,
and the attenuation is greater than the recommended Loop Attenuation
Alarm Threshold
No span power is present
Synchronized with an Signal to Noise Ratio (SNR) margin greater than
the recommended SNR Margin Alarm Threshold
(Flashing 3 times per second) Attempting to synchronize with the
H4TU-R
(Flashing once per second) Synchronized with a SNR margin greater
than the recommended SNR Margin Alarm Threshold, and the attenua-
tion is greater than the user recommended Loop Attenuation Alarm
Threshold
Synchronized with a SNR margin greater than 0 dB but less than the
recommended SNR Margin Alarm Threshold
Synchronized with a SNR margin greater than 0 dB but less than the
recommended SNR Margin Alarm Threshold, and the attenuation is
greater than the user recommended Loop Attenuation Alarm Threshold
Synchronized with a SNR margin of 0 dB
(Flashing once per second) Synchronized with a SNR margin of 0 dB,
and the attenuation is greater than the recommended Loop Attenuation
Alarm Threshold
Indicates that a loopback is active at the H4R towards the H4TU-C
H4R is armed but not in loopback
Indicates that a loopback is active at the H4R towards the H4TU-R
Front Panel LEDs
Table 6
for a listing of the
9
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