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239 H4R Installation and Maintenance Practice Front Panel LEDs
61223445L1-5D 9
7. FRONT PANEL LEDS
The ADTRAN 239 H4R provides front panel LEDs to display status information. See Table 6 for a listing of the
front panel LEDs and their indications.
Table 6. Front Panel LEDs
Unit Label Indication Description
LP1/LP2
NET
! Off
" Solid Green
✹ Fast Flashing Green
✹ Slow Flashing Green
" Solid Yellow
✹ Flashing Yellow
" Solid Red
✹ Flashing Red
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
LP1/LP2
CUST
! Off
" Solid Green
✹ Fast Flashing Green
✹ Slow Flashing Green
" Solid Yellow
✹ Flashing Yellow
" Solid Red
✹ Flashing Red
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
LL/RL
" Solid Yellow
✹ Flashing Yellow
" Solid Green
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
239 H4R
1223445L1
LP1
NET
LP2
LP1
LP2
LL RL
(Y) (G)
/
CUST