Comtech EF Data SMS-301 - Manual (Page 109)

SMS-301 Redundancy Switch SDM-2020 System Installation
Rev. 3 C–7
The cable pin assignments are specified in Table C-4.
Table C-4. Cable Pin Assignments (CA/6217)
SMS-301 (DB-37) SDM-2020M DVB
Pin # Name Signal Function
Parallel or Serial
(J3 DB 25 EIA-422)
19
37 CLK-A
CLK-B Master Clock
(TT Serial) 1
14
34
15 SYNC-A
SYNC-B Synchronized 12
25
33
14 VAL-A
VAL-B Data Valid 11
24
32
13 DAT7-A
DAT7-B Data Bit 7
(Serial Data Bit) 3
16
31
12 DAT6-A
DAT6-B Data Bit 6 4
17
30
11 DAT5-A
DAT5-B Data Bit 5 5
18
29
10 DAT4-A
DAT4-B Data Bit 4 6
19
28
9
DAT3-A
DAT3-B Data Bit 3 7
20
27
8
DAT2-A
DAT2-B Data Bit 2 8
21
26
7
DAT1-A
DAT1-B Data Bit 1 9
22
25
6
DAT0-A
DAT0-B Data Bit 0 10
23
1 SG Signal Ground 13
21
2
REFCLK-A
REFCLK-B Reference Clock
(ST Serial) 15 Reference Clock or
2 Ground
22 DF DEMOD Fault AUX (J5) Pin 2 DB 9
3 MF MOD Fault AUX (J5) Pin 6 DB 9
C.1.3.2 Connect to SDM-2020 Modulator with EIA-422 DVB TX Interface
Refer to Figure C-3.
1. Connect the “COMM” data interface connector (J1) to the DTE equipment.
Note: Equivalent cable shall be computer grade, 100
Ω, incorporating twisted and
shielded pairs. Typical length shall be
≤ 16 feet (5 meters).
2. Connect the “A” data interface connector (J2) to the prime SDM-2020 Modulator
“SERIAL” (J4) connector and “AUX” (J5) connector using Cable (CA/6217) or
equivalent.
3. Connect the “B” data interface connector (J3) to the backup SDM-2020
Modulator “SERIAL” (J4) connector and “AUX” (J5) connector using Cable
(CA/6217) or equivalent