Operating instructions

DMD20/DMD20 LBST Universal Satellite Modem Rear Panel Interfaces
TM103 – Rev. 2.8 5-29
23 Backward Alarm In – 3 ESCBWI 3 Input
24 No Connection NC ---
25 No Connection NC ---
5.12.5 SD (DDI) (J6)
The Send Data (Drop Data In) Port (Unbalanced) is a 75-Ohm Female BNC Connector.
5.12.6 DDO (J7)
The Drop Data Out Port (Unbalanced) is a 75-Ohm Female BNC Connector.
5.12.7 IDI (J8)
The Insert Data In Port (Unbalanced) is a 75-Ohm Female BNC Connector.
5.12.8 SD (IDO) (J9)
The Send Data (Insert Data Out) Port (Unbalanced) is a 75-Ohm Female BNC Connector.
5.13 HSSI / Ethernet (J1)
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 5-19.
Table 5-19. 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