Comtech EF Data LCS-4 - Manual (Page 19)

LCS-4 L-Band Combiner Switch Revision 1
Introduction MN/LCS4.IOM
1.5 E
XTERNAL
BUC/LNB F
AULT
I
NPUT
Use of this connector is optional. This connector permits fault inputs from ODU/BUC or
LNB that have fault contacts for fault indication. Normally, this connector is used in
applications where the ODU/BUC power supply or LNB power supply is external to the
LCS-4 to permit a means of indicating a fault to the LCS-4 so that ODU/BUC or LNB
switchover still occurs.
The external fault inputs are enabled in one of two ways:
1. By grounding the BUC Input Enable and /or the LNB Input Enable.
2. Activating the DIP-switches that control the BUC Input Enabled and/or LNB
Input Enable.
J21, 9-pin D Female
Pin #
Signal Name Signal
Direction
Description
1
2
8 BUCA_FLT
BUCB_FLT_BUF
BUC_FLT_EN I
I
I External BUC A Fault. (Grounded is OK)
External BUC B Fault. (Grounded is OK)
External BUC Fault Input Enable – with
GND
6
7
3 LNBB_FLT
LNBB_FLT_BUF
LNB_FLT_EN I
I
I External LNB A Fault (Grounded is OK)
External LNB B Fault (Grounded is OK)
External LNB Fault Input Enable – with
GND
4,5,9 GND GND Ground
1–5