User guide

2-20 Solo E1 DSU User Guide—June 1998
2
Standalone And Module Front Panel LEDs
The LEDs on the Solo E1 DSU provide the status of the data port, network
port, and diagnostic tests.
Table 2-10 Ensemble Shelf DL2001 Module Jumper Settings
Ensemble Shelf DL2001 Module DL2020E-120NA
Jumpers 7, 8 Required. Jumper default: 1-2.
11 Open
12, 13, 14, 15 Jumper 1-2. Directs signal to network port.
4, 5, 6, 9, 10 Open, 120 ohm
Table 2-11 Solo E1 DSU LED Descriptions
Item Status Description
PWR/TEST LED Solid green
Off
Solid yellow
Blinking yellow
Solid red
Power is on.
Power is off.
Test is running (other than Self Test).
Self Test running.
Self Test failed. LED turns green after 10 sec
(Module—a solid red LED means alarm is present)
NET LED Solid green
Off
Solid red
Alternate red/green
Solid yellow
E1 network operation normal.
Loss of network signal.
Solo E1 DSU cannot synchronize to net frame.
Receiving CRC4 or CV.
Remote Alarm Indication bit asserted in signal from network
port.
NET LPBK LED Solid yellow Net Loopback test running.
REMOTE LPBK
ACK LED
Solid yellow
Blinking yellow
Off
Solo E1 DSU has detected Set or Reset code.
Blinks 3 sec when Loop Up or Loop Down remote test
successful.
Solo E1 DSU has not detected Set or Reset code.
DTE LPBK LED Solid yellow
Blinking yellow
Solo E1 DSU performing DTE Loopback test initiated by user
of management station.
Solo E1 DSU performing DTE Loopback test initiated by DTE
equipment asserting LT line.
TD Solid green
Off
Pulses from DTE detected.
No pulses from DTE detected or no DTE connected.
RD Solid green
Off
Pulses to DTE detected.
No pulses to DTE detected, Net carrier loss or Net sync loss
signal detected.