Specifications

DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces
MN-DMD20-20LBST Revision 14 5–30
5.13.8 SD (IDO) (J9)
The Send Data (Insert Data Out) Port (Unbalanced) is a 75-Ohm Female BNC Connector.
5.14 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
25
N/A
MOD_FLT
Alarm
Output
50
N/A
DMD_FLT
Alarm
Output