User manual

Chapter 2. Hardware Installation
2-2
The following table describes the LEDs’ function of the SHDTU03.
LED Color Action Description
On Power is on.
PWR Green
Off Power is off.
On Major alarm occurs.
ALM Red
Off System is working normally.
On System is testing for connection.
System
TST Yellow
Off System is working normally.
On SHDSL line is connected.
Blink Data transmit in SHDSL line.
SYN Green
Off SHDSL line has dropped.
Blink There are error seconds.
ERR Red
Off There are not any error seconds.
On Loopback is on.
SHDSL
LBK Yellow
Off Loopback is off.
On E1 line is connected.
SYN Green
Off E1 line has dropped sync.
Blink There are error seconds.
ERR Red
Off There are not any error seconds.
On Loopback is on.
G.703
LBK Yellow
Off Loopback is off.