Installation manual

LBI-38987B CONFIGURATION
14
Use the following procedure to install the modem if it is
not already installed:
NOTE
If the SCAT station is setup to use the Wide Area
Digital option, a Rockwell Modem must also be
installed in the Station GETC. This allows the
station to send and receive digital information to
the CEC/IMC through the audio path.
Use the following steps to set up the basic audio line
levels. If the Station GETC is linked to a MultiSite system
other than the CEC/IMC (i.e. Data Gateway), different
levels may be required. Consult the applicable system
installation manual for the required levels.
1. Ensure jumpers are installed on J11 pins 1 & 2 and
J12 pins 1 & 2.
2. Apply power to the GETC.
3. Adjust the receive level by monitoring U18 pin 1
(refer to Figures 5 and 6) and adjusting the receive
level potentiometer R1 (located on the GETC
Logic Board) for 400 mVpp as measured with an
oscilloscope (85 mVrms if using an RMS
Voltmeter).
4. Verify the presence of demodulated signal data at
TP107.
5. Adjust the transmit level potentiometer R2 for the
maximum output level allowed by the phone line,
microwave link, or equivalent communication line.
For telephone lines linking the Station GETC to the
CEC/IMC Uplink GETC, adjust R2 for .77 Vrms
(0 dBm) measured across J6-8 and J6-9 (TB10-1
and 2). For microwave links, adjust R2 for -10
dBm across J6-8 and J6-9.
6. Initialize the modem by pressing S4 (on the GETC
Logic Board) to reset the Station GETC or cycle
the GETC Shelf's operating power.
Jumper Installation
There are a few jumpers on the GETC Logic Board
which must be re-configured for different applications. To
properly configure the GETC jumpers, refer to jumper tables
in SRN1060 or SRN1061 and install or remove jumpers
according the intended GETC application. The location of
the jumpers may be found using the board layout diagram in
Figure 6.
NOTE