Specifications

Chapter 3 Operation FOM-40 Installation and Operation Manual
3-2 Turning On FOM-40
Table 3-1. FOM-40 Front Panel Controls and Indicators
Name Type Function
PWR Green LED ON – Power is on.
RTS Yellow LED ON – The DTE activates Request To Send.
TD Yellow LED ON – Steady SPACE is being transmitted.
Blinks – Data is being transmitted.
RD Yellow LED ON – Steady SPACE is being received.
Blinks – Data is being received.
DCD Yellow LED
ON – A valid receive signal is present.
TEST Yellow LED ON – FOM-40 is in one of three loopback modes, or the PATT
pushbutton is pressed.
ERR Red LED ON or blinks if errors are present.
DIG Pushbutton Pressing the digital loopback pushbutton causes the local
FOM-40 to loop received data to its transmitter (see Figure 4-3).
ANA Pushbutton Pressing the local loopback pushbutton causes the local FOM-40
to loop its transmitter output back to its receiver
(see Figure 4-1). This loopback may also be activated from the
DTE when SW5/5 is set to EN (excluding X.21, G.703 and
Ethernet interfaces).
REM Pushbutton Pressing the remote digital loopback pushbutton causes the
remote FOM-40 to loop received data to its transmitter
(see Figure 4-2). This loopback may be also activated from the
DTE when SW5/5 is set to EN (excluding X.21, G.703 and
Ethernet interfaces).
PATT Pushbutton Pressing the PATT switch causes FOM-40 to send and receive a
test pattern. If errors occur, the ERR indicator lights up.
SW5/5 dip switches control the LLB and RLB activation only from the DTE interface.
The jumper settings do not affect the ANA and REM pushbutton operation.
3.2 Turning On FOM-40
When power is connected to FOM-40 it turns on, the PWR indicator lights, and
remains lit as long as the unit receives power.
FOM-40 requires no operator attention once installed, except for occasionally
monitoring front panel indicators. Intervention is required only when the modem
is configured to new operational requirements, or diagnostic tests are performed.
Note