Comtech EF Data CRS-280L - Manual (Page 36)

CRS-280L L-Band IF Switch for 1:N Redundancy Revision 1
Connector Pinouts MN/CRS280L.IOM
3–4
3.3 Rear Panel Control Connectors
Unless otherwise noted, the connectors featured on the rear panel of the CRS-280L are intended
for connection to the companion redundancy switch control interface.
3.3.1 Switch Control Interface Connectors
3.3.1.1 J1 CRS Control Interface Connector, DB-25F
The 25-pin ‘D’ Type female (DB-25F) J1 CRS Control Interface
connector is used to connect the CRS-280L to the IF Switch Control
port, located on the CRS-230 Controller card installed in the CRS-400
1:8 Redundancy Switch or CRS-300 1:10 Redundancy Switch, or to the
P1 IF Switch Control port located on the control interface side of the CRS-500 M:N Redundancy
System’s Data Switch Unit (DSU).
The Comtech EF Data CRS-400 1:8 Redundancy Switch is a legacy product that is
no longer in production.
The J1 CRS Control Interface connector communicates with the logic interface of the companion
redundancy switch to drive the currently selected terrestrial modem, and to decide whether the
system is in bridged or backup mode. The CRS-280L performs the same bridging and backing up
functions of the Tx and Rx IF signals to match what the companion redundant switch does to the
terrestrial data signals.
3.3.1.2 J2 SMS Control Interface Connector, DB-15M
The 15-pin ‘D’ Type male (DB-15M) J2 SMS Control Interface
connector is used to connect the CRS-280L to the J12 IF Control
Interface port of SMS-7000 1:8 Modem Protection Switch’s Data
Switch Unit (DSU).
The Comtech EF Data SMS-7000 1:8 Modem Protection Switch is a legacy
product that is no longer in production.
NOTE
NOTE