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CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier®
Rear Panel Connectors
3.3.6.2
HSSI Connector Pin Assignments
Signal Function
Signal Ground
Receive Timing
DCE Available
Receive Data
Loopback circuit C
Send Timing
Signal Ground
DTE Available
Terminal Timing
Loopback Circuit A
Send Data
Loopback Circuit B
Signal Ground
Not used
TX DVALID
Ext Carrier Off
reserved (to DCE)
reserved (to DCE)
Signal Ground
Carrier Detect
reserved (to DTE)
Signal Ground
The HSSI interface features a 50-pin female SCSI-2 connector
(mini-D), with pin assignments as follows:
HSSI
EIA-613
Pin # (+,-)
Signal
Circuit
SG
102
RT
115
CA
107
RD
104
LC
undefined
ST
114
SG
102
TA
108/2
TT
113
LA
143
SD
103
LB
144
SG
102
undefined
undefined
SG
102
undefined
undefined
undefined
undefined
undefined
142
SG
102
3–12
Circuit
Direction
1, 26
2, 27
from DCE
3, 28
from DCE
4, 29
from DCE
5, 30
from DCE
6, 31
from DCE
7, 32
8, 33
to DCE
9, 34
to DCE
10, 35
to DCE
11, 36
to DCE
12, 37
to DCE
13, 38
14, 39
15, 40
16
to DCE
17, 42
18, 43
19, 44
20
from DCE
45
21
46
22, 47
from DCE
23, 48
from DCE
24, 49
from DCE
25, 50
Revision 7
MN/CDMQX.IOM
Comment
Ground
Not used
Ground
Not used
Not used
Ground
Not used
Not used
Not used
Not used
Not used
Ground
Not used
Not used
Not used
Not used
Not used
Not used
Ground
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