Comtech EF Data CRS-400 - Manual (Page 35)

CRS-400 1:8 Redundancy Switch Revision 0
Installation and Setup MN/CRS400.IOM
19
Pin Description
16 BU Demod Replaces Traffic Demod “N”, Bit 2 of 3 – NO Contact
3 BU Demod Replaces Traffic Demod “N”, Bit 3 of 3 – NO Contact
15 Unused Relay – NO Contact
2 Unused Relay – NO Contact
14 Unused Relay – NO Contact
1 Common contact for pins 3-6 and 15-18
* Note: Mod/demod Select 0-3 represent the binary address of the Mod/Demod.
2.6.4 IF S
WITCH
C
ONTROL
C
ONNECTOR
The IF Switch Control connector should be cabled directly to the corresponding
connector on the CRS-280 IF Switch, if used. This supplies power to the CRS-280, along
with the logic interface to drive the currently selected traffic mod/demod, and to decide
whether the system is in bridged or back-up mode. The CRS-280 must perform the same
bridging and backing up functions to the transmit and receive IF signals to match what
the CRS-400 does to the terrestrial data signals. Table 2-3 provides the pinout
information.
Table 2-3 IF Switch Control Connector, 25-Pin D Type Male
Pin # Condition
16 Enable
5 Clock
17 Serial Data
4 Mod_Backup
8 Demod_Backup
3 Rev_Bit0, (for PCA hardware revision control)
18 Rev_Bit1
6 Rev_Bit2
19 Rev_Bit3
7 Product_ID_Bit0, (for IF switch identification)
20 Product_ID_Bit1
21 IF Switch Present