Comtech EF Data SMS-458B - Manual (Page 30)

SMS-458B Modem Protection Switch Revision 2
Installation MN/SMS458B.IOM
2–4
2.3 External Connections
All connections between the switch and other equipment are made through rear panel
connections. Table 2-1 lists these connectors, and Figure 2-2 shows their locations. The
uses of these connectors are described in the following sections.
Table 2-1. Rear Panel Connections
Name
Ref Desig Connector
Type
Function
DATA I/O MODULES J5, J6
J1 – J4 50-pin D BNC
BNC Mod, Demod Faults
G.703, ECL/HSSI, I/O
REMOTE J1, J2, J3 9-pin D Remote Interface
ON-LINE STATUS J4, J5 25-pin D Online Status Reporting
RELAY/REMOTE FAULTS J6 25-pin D Relay/Remote and Faults
DOWNLINK INPUTS J7 to J10,
J12 to J15 BNC Downlink IF Inputs
BACK-UP DEMODS J11, J16 BNC Downlink Outputs to Backup
Demods
PRIME MOD INPUTS J18 to J25 BNC Modulator IF Inputs
BACK-UP MOD INPUTS J26, J36 BNC Backup Mod IF Inputs
OFF-LINE IF OUTPUTS J17, J27 BNC Offline Mod IF Outputs
IF OUTPUTS J28 to J35 BNC IF Outputs to Uplinks
AC POWER J37, J38 CEE22 AC Power Input
GROUND J39 #10-32 stud Chassis Ground
Note: All unused BNC connectors must have a 75
Ω termination.