
DD240XR High-Speed Digital Demodulator Electrical Interfaces
MN-DD240XR – Rev. E 5-5
5.9 J8 Ports
J8 is the External Clock Input for the G.703 and HSSI Interfaces.
J8 is the Parallel/Serial RS-422 Output for the ASI Interface.
5.9.1 PARALLEL (ASI/DVB SPI or ASI/M2P Interfaces)
M2P/DVB is supported on the DB-25 Female Connector. It complies with RS-422 Electrical
Specifications. Refer to Tables 5-5a and 5-5b for pinouts for this connector. The maximum data
rate is 157.5 Mbps.
Table 5-5a. J8
Parallel - 25-Pin Female
Pin No. M2P Signal Name DVB Signal Name Direction
1 No Signal Present CLK+ Output
14 No Signal Present CLK- Output
2 CLK+ GND Output
15 CLK- GND Output/Ground
3 SYNC+ D7+ Output/Ground
16 SYNC- D7- Output
4 VALID+ D6+ Output
17 VALID- D6- Output
5 D0+ D5+ Output
18 D0- D5- Output
6 D1+ D4+ Output
19 D1- D4- Output
7 D2+ D3+ Output
20 D2- D3- Output
8 D3+ D2+ Output
21 D3- D2- Output
9 D4+ D1+ Output
22 D4- D1- Output
10 D5+ D0+ Output
23 D5- D0- Output
11 D6+ VALID+ Output
24 D6- VALID- Output
12 D7+ SYNC+ Output
25 D7- SYNC- Output
13 GND GND Ground
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