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Rear Panel Interfaces
5.9 RF Switch Control
Each modulator has a 9-pin D-sub connector for the switch. A 1:1 cable is connected from each
modulator to the switch. The pinout for the control connector is listed in Table 5-5.
Pin No.
5
Signal Ground
9
Backup Select
1
2
nPrime_Sel
7
nBackup_Sel
8
Local Fault
4
Distant Fault
3
Switch-State
6
5.10 ASI/Parallel RS-422 Interface
This interface supports four terrestrial interface types.
5.10.1 M2P (Parallel, RS-422, J8)
M2P is supported on the DB-25 female connector. It complies with RS-422 Electrical
Specifications. Refer to Table 5-5 for pinouts for this connector. The maximum data rate is 238
Mbps.
Table 5-5. J8 − M2P RS-422 Parallel - 25-Pin Female
Pin No.
1
OUTCLK+
14
OUTCLK-
2
CLK+
15
CLK-
3
SYNC+
16
SYNC-
4
VALID+
17
VALID-
5
D0+
5-6
Table 5-5. RF Switch Control 9-pin 'D' Female
Signal
One modulator is designated as
Backup. This line is tied low on the
Backup Mod Control connector.
+DC
Forces On-Line output to Prime
Forces On-Line output to Backup
NC
Signal Name
DM240-DVB High-Speed Digital Modulator
Description
Modulator GND
+12V DC power
Fault output of modulator
State of distant modulator
Switch state monitor.
Logic '1' = Prime Online
---
Direction
Output
Input
Output
Output
Output
Output
Input
Input
---
Direction
Output
Output
Input
Input
Input
Input
Input
Input
Input
TM083 - Rev. 3.0
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