Operating instructions

DMD20/DMD20 LBST Universal Satellite Modem Rear Panel Interfaces
TM103 – Rev. 2.8 5-25
5.11 Ethernet Data Interface (Optional)
The optional modem Ethernet Data Interface provides four RJ-45 10/100 Base-T interface. The
Ethernet interface supports Auto-Crossover and Auto-Sensing. The Ethernet port are referred to
as JS1 through JS4.
JS1 is Port 1
JS2 is Port 2
JS3 is Port 3
JS4 is Port 4
Refer to Figure 5-1 for outline drawings and Appendix J for setup & configuration.
5.12 HSSI / G.703
The HSSI (High-Speed Serial Interface) (J1) 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 5-14.
Table 5-14. J1 – 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