29
CHAPTER 4: Operation
4.2 Operating Instructions
The G.703 Codirectional Converter operates unattended once it has been
installed and powered up. Intervention is only required when the Converter
is set up for the first time, when it must be adapted to new operational
requirements, or when diagnostic loops are necessary.
4.2.1 T
URN
-O
N
P
ROCEDURE
The Converter is turned on as soon as power is connected. When power
is connected, the PWR LED comes on and remains lit as long as the unit
receives power.
If the LOS LED is ON, check the line and make sure it is connected properly.
The TEST LED is ON while either the DIG or ANA pushbutton is depressed,
or when Pin 18 in the 25-pin connector is active.
4.2.2 A
CTIVATING
L
OOPS
When performing tests, observe the following guidelines and restrictions:
• Activation of a test loop interrupts normal traffic flow.
• Only one test may be activated at a time.
4.2.3 T
URN
-O
FF
P
ROCEDURE
The Converter can be turned off only by disconnecting its power.
NOTE
Always disconnect the power cord from the AC outlet before you
disconnect it from the Converter.
4.3 Diagnostic Loops
Local analog loopback or local digital loopback can be activated by
depressing the front-panel pushbutton labeled ANA or DIG respectively.
Local analog loopback can also be activated from the local DTE through
Pin 18.
Activating local analog loopback causes a loop in the local G.703-interface
circuit, towards the local data equipment (as shown in Figure 4-2).
Activating local digital loopback causes a loop in the local unit on the
DCE-interface circuitry, towards the G.703 interface (as shown in Figure 4-3).
