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SDM-2020 Satellite Demodulator
A.8.4
Loopback Connection
Refer to Table A-40 for additional requirements for Loopback.
ASI Interface is active in Modulator
LVDS Interface is active in Modulator
ASI Interface is active in Demodulator
LVDS Interface is active (output) in
Demodulator
A.8.5
Loop Thru
The operation of Loop Thru is the same as Loopback except the normal operating mode
not a test mode, and the TEST LED does not illuminate.
Rev.3
Table A-40. Looback Connections
Loops ASI input, J3 (or J4), to ASI output, J7. If JP1 is Off,
then J3 (J4) also loops to J6, the LVDS-DVB parallel output
The LVDS signal contains D0-D7, Sync, Dvalid, and Clock
If J1 is On, then J6 (LVDS-DVB input) is looped to the ASI
output J7.
JP1 is Off (Normal): When Loopback is engaged the TX ASI
(J3) input connects simultaneously to the RX ASI (J7) and to
the RX LVDS connector (J6). The LVDS signal contains D0-
D7, Sync, Dvalid, and Clock
JP1 is On: When Loopback is engaged the TX LVDS (J6)
input connects to the RX ASI (J7) connector.
JP1 is ON: When Loopback is engaged the TX LVDS (J6)
input connects to the RX ASI connector (J7). The LVDS signal
contains D0-D7, Sync, Dvalid, and Clock.
JP1 is OFF (Normal): When Loopback is engaged the TX ASI
input connects to the RX ASI connector and to the RX LVDS
connector. The LVDS signal contains D0-D7, Sync, Dvalid,
and Clock.
Data Interfaces
A–71
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