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8 61223441L1-5C
Front Panel LEDs T200 H4R Installation and Maintenance Practice
6. FRONT PANEL LEDS
The ADTRAN T200 H4R provides front panel LEDs to display status information. See Table 4 for a listing of the
front panel LEDs and their indications.
Table 4. Front Panel LEDs
Unit LED Indication Description
PWR
{ Off
z On
No span power is present
Span power is present
LP1/LP2
NET
{ Off
z Solid Green
✹ Fast Flashing Green
✹ Slow Flashing Green
z Solid Yellow
✹ Flashing Yellow
z 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 SNR Margin Alarm Threshold, and the attenuation is greater
than the Loop Attenuation Alarm Threshold
Synchronized with a SNR margin greater than 0 dB but less than the
SNR Margin Alarm Threshold
Synchronized with a SNR margin greater than 0 dB but less than the
SNR Margin Alarm Threshold, and the attenuation is greater than the
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 Loop Attenuation Alarm
Threshold
LP1/LP2
CUST
{ Off
z Solid Green
✹ Fast Flashing Green
✹ Slow Flashing Green
z Solid Yellow
✹ Flashing Yellow
z Solid Red
✹ Flashing Red
No span power is present
Synchronized with an Signal to Noise Ratio (SNR) margin greater
than the 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 SNR Margin Alarm Threshold, and the attenuation is greater
than the Loop Attenuation Alarm Threshold
Synchronized with a SNR margin greater than 0 dB but less than the
SNR Margin Alarm Threshold
Synchronized with a SNR margin greater than 0 dB but less than the
SNR Margin Alarm Threshold, and the attenuation is greater than the
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 Loop Attenuation Alarm
Threshold
LL/RL
z Solid Yellow
✹ Flashing Yellow
z 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
1223441L1
PWR
H R
LP1
NET
LP2
LP1
LP2
LL RL
(Y) (G)
/
CUST