2 connector pinouts, j4 – Comtech EF Data SDM-2020 User Manual
Page 142
SDM-2020 Satellite Demodulator
Revision 4
LVDS Data Interface
MN/SDM2020D.IOM
8–6
applications, the polarity of signals may be inverted from the Functional Select:
Configuration: Interface menu.
Table 8-2. DVB Interface Connector Pinout, J3 RX OUT
Pin #
Signal Function/Name
Type
Comment
1 Clock
A
O Demod
2 System
GND
I/GND
Demod,
LVDS Interface - N/A, jumper on GND only
3
Data 7 A(MSB/Serial)
O
Demod
4
Data 6 A
O
Demod
5
Data 5 A
O
Demod
6
Data 4 A
O
Demod
7
Data 3 A
O
Demod
8
Data 2 A
O
Demod
9
Data 1 A
O
Demod
10
Data 0 A
O
Demod
11 DVALID
A
O Demod
12 SYNC
A
O Demod
13 Cable
Shield
O Demod
14 Clock
B
O Demod
15 System
GND
I/GND Demod,
LVDS Interface - N/A, jumper on GND only
16
Data 7 B (MSB/Serial)
O
Demod
17
Data 6 B
O
Demod
18
Data 5 B
O
Demod
19
Data 4 B
O
Demod
20
Data 3 B
O
Demod
21
Data 2 B
O
Demod
22
Data 1 B
O
Demod
23
Data 0 B
O
Demod
24 DVALID
B
O Demod
25 SYNC
B
O Demod
8.1.4.1.2
Connector Pinouts, J4
Note: Table 8-3 is included for reference only. The provided data pertains to the
SDM-2020 Satellite Modulator.
The connector is sub-miniature 25-pin D female, with threaded jack nuts (refer to
Table 8-3 for connector pinouts). All signals for this connector are inputs to the
Modulator, except the signal pair on pins 2 and 15 (for an exception, see Figure 8-1, for
jumper settings).
When used as a serial data port, Data 7 (pins 3 and 16) are the active data pins. For DVB
parallel operation, Data 7 through Data 8 are used.
Signal levels are as defined in TIA/EIA-644. Per TM1449, the differential sense of all
signal pairs is a logic “1” when “A” is positive with respect to “B”. This is the normal
selection in the Functional Select: Configuration: Interface menu. For DBS