RCPF-1000 Fiber Optic System Controller
209872 REV -
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5.3 Downlink / RX Loop Back Verification
Refer to
Figure 5-2
for a block diagram of the test setup for Loop Back Verification
Tests.
Remove the Spectrum analyzer/Power meter from the system.
Connect the crossguide coupler output to the Loop Test Translator (LTT) input and the
LTT output to the LNB input. Adjust the system gain using the LTT to prevent the LNB
from operating beyond the P
1dB
point. Other attenuators may be required to keep all
the system elements within their operating parameters.
To verify system receive level, disconnect the RCPF-1000 Port J22, RX IFL from the
system. Monitor this port using the Spectrum analyzer. Receive power can also be
monitored on the modem front panel.
Once the system has been verified to be operating according to specification, a BER
test can now be performed.
Reconnect the cable to the RCPF-1000 Port J22, RX IFL, if necessary.
Switch the modem from CW to the appropriate digital communications scheme. The
system should now be operating at a high EB/No with no errors. System EB/No can be
set and a BER curve derived using the appropriate system configuration. However, this
test is beyond the scope of the quick start guide.
Figure 5-2: Diagram, Downlink / RX Loop Back Test Block Diagram
LINK
J5
M & C
J4
SWITCH
J6
J1
J6 PROGRAM
J22 IFL OUT
P/N: L204634-X
J9 ETHERNET J5 SERIAL LOCAL
J7 PARALLEL I/O
J4 SERIAL MAIN
MODEL: XXXXXXXXXXXX
S/N: XXXX
PS1
J1
J22 IFL IN
J21 OPT TX/RX
TX
RX
Summary of Contents for RCPF-1000-CO
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