Operating instructions

Rear Panel Interfaces DMD20/DMD20 LBST Universal Satellite Modem
5-20 TM103 – Rev. 2.8
5.9 High-Speed Serial Interface (HSSI) (Optional)
5.9.1 HSSI (J6)
The HSSI (High-Speed Serial Interface) (J6) complies with the HSSI Functional and Electrical
Specifications. The physical interface is a 50-Pin SCSI-2 Type Connector. Electrical levels are
ECL. Gapped clocking not supported. The pinouts for this interface are listed in Table 5-11.
Table 5-11. J9 – HSSI (High-Speed Serial Interface) 50-Pin Connector
Pin No. (+) Pin No. (–) Signal Name Description Direction
1 26 SG Signal Ground ---
2 27 RT Receive Timing Output
3 28 CA DCE Available Output
4 29 RD Receive Data Output
6 31 ST Send Timing (SCT) Output
7 32 SG Signal Ground ---
8 33 TA DTE Available Input
9 34 TT Terminal Timing (SCTE) Input
11 36 SD Send Data Input
13 38 SG Signal Ground ---
14 - 18 39 – 43 5 Ancillary to
DCE
Reserved Input
19 44 SG Signal Ground ---
20 - 23 45 - 48 4 Ancillary
from DCE
Reserved Output
24 49 TM Test Mode Output
25 N/A MOD_FLT Alarm Output
50 N/A DMD_FLT Alarm Output
5.10 ASI/DVB/M2P Interface (Optional)
5.10.1 ASI IN (J1)
The ASI IN Port (J1) is supported on the BNC Connector. The interface complies with DVB ASI
Electrical Specifications.
5.10.2 ASI OUT (J2)
The ASI OUT Port (J2) is supported on the BNC Connector. The interface complies with DVB
ASI Electrical Specifications.