6. LED Description
All the status LED’s are located in the front panel of the E1 Plus unit. The
indicators are arranged into four groups according to their function as detailed
below.
Power
The power LED (green) lights when power supplied to the device that is the unit
is connected to the appropriate power source and the power switch on the rear
panel is switched on.
Optical
Tx – Transmit indicator (green); this LED lights up when the device is
transmitting on its optical port.
RX – Receive indicator (green); this LED shows the presence of an optical
signal on the RX side of the optical port.
Rx S. Loss – Receive Sync Loss (red); this LED lights when the unit has lost the
sync of the incoming signal on the optical port.
Re S. Loss – Remote Sync Loss (red); this LED indicates that the remote unit is
sending Sync Loss Frames, which means it has lost the sync on its optical side.
Equipment
Tx – Transmit indicator (green); this LED lights up when the device is
transmitting on its E1 port. If the signals are reversed on the G.703 port e.g. the
transmitter is connected to the opposite transmitter, the indicator is blinking. If
the device detects a short circuit on the TX line the LED goes out.
Rx – Receive indicator (green); this LED lights up when the device is receiving
valid data on its G.703 interface.
SLS – Signal loss (red); this LED indicates that there is no signal present on the
RX side of the E1 port.
AIS – All ones (red); this LED is turned on when the equipment is receiving
AIS signals on the E1 line interface.
