Comtech EF Data SDM-2020, Installation And Operation Manual

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SDM-2020 Satellite Demodulator Operation
Rev. 3 3–15
3.3.1.2 Configuration Interface Menu
Refer to Figure 3-5.
RX CLOCK PHASE Programs Receive Clock phase to NORMAL or INVERT.
On entry, the current setting for the RX Clock Phase is displayed. Press [
↑
] or [
↓
]
to select NORMAL or INVERT. Press [ENTER] to execute the change.
RX DATA PHASE Programs Receive Data phase to NORMAL or INVERT.
On entry, the current setting for the RX Data Phase is displayed. Press [
↑
] or [
↓
]
to select NORMAL or INVERT. Press [ENTER] to execute the change.
RX DATA FAULT Receive data fault. Press a directional key to select one of the following modes
(see Note):
•
NONE: The receive interface alarm DATA/AIS is not activated.
•
AIS (Alarm Indication Signal): Sets receive interface alarm DATA/AIS to
monitor an alarm condition of all 1s in data stream.
•
DATA STABLE: Sets receive interface fault DATA/AIS to monitor an
alarm condition of all 1s or 0s. This is referred to as a data-stable
condition, which means that the data is not transitioning.
Upon entry, the current RX Data Fault that is being monitored is displayed. Press
[
↑
] or [
↓
] to make the selection. Press [ENTER] to execute the change.
Note: Detection of these conditions produces an alarm indication, not a fault.
DVB FRAMING TYPE Programs the DVB framing type for 188, 204, or NONE.
Note: Pressing <ENTER> in this selection, turns Off RX-IF Output.
The framing type describes the format of the data into the demodulator. The
equivalent serial data rate at the data interface connector is based upon the clock
rate of the incoming data stream. Refer to Section 3.1 for information on the
different framing types.
Upon entry, the current status of the DVB framing type is displayed. Press [
↑
] or
[
↓
] to make the selection. Press [ENTER] to execute the change.
RX 2047 PATTERN
Note:
This is a test mode
and the front panel test
LED, will blink when
2047 pattern.
Displays “LOCKED” upon detection of a valid 2047 pseudorandom data pattern.
Displays “NO DATA” when the demodulator cannot detect a valid 2047
pseudorandom data pattern. Displays:
“NOT ENABLED” if “RX 2047 PATTERN” is selected OFF in the
<CONFIGURATION><INTERFACE> menu.
Upon entry, the current status is displayed. Press [
↑
] or [
↓
] to make the selection.
Press [ENTER] to execute the change.