Comtech EF Data SMS-758 - Manual (Page 33)

SMS-758 Modem Protection Switch Installation
MN/SMS758 Rev. 3 2–5
Table 2-1. Rear Panel Connections
Name Ref. Desig. Connector Function
DATA I/O A1 - A10
J1, J2 37-Pin D
34-Pin Block
15-Pin D
37-Pin D
50-Pin D
50-Pin D
RS-422/449 and
MIL-STD-188-114 I/O
V.35 I/O
DS-1 and G.703 I/O
DCTN I/O
IDR I/O
IBS I/O
EXTERNAL
RS485
RS232 J1
J2 9-Pin D
9-Pin D
Remote Interface
MODEM
CONTROL RS485 J3 9-Pin D Remote Interface
ON-LINE STATUS J4 and J5 25-Pin D Mod and Demod Online Status
Reporting
REMOTE/FAULTS J6 25-Pin D Relay/Remote and Faults
DOWNLINK
INPUTS J7 through J10,
J12 through J15 BNC Downlink IF Inputs
BACK-UP
DEMODS J11 through J16 BNC Downlink Outputs to Backup
Demods
PRIME MOD
INPUTS J18 through J25 BNC Modulator IF Inputs
BACK-UP MOD
INPUTS J26 and J36 BNC Backup Mod IF Inputs
OFF-LINE IF
OUTPUTS J17 and J27 BNC Offline Mod IF Outputs
IF OUTPUTS J28 through J35 BNC IF Outputs to Uplinks
AC POWER J37, J38 CEE22 AC Power Input
DC POWER J37, J38 Terminal
Block 48 VDC Power Input
GROUND J39 #10-32 Stud Chassis Ground
Note: All unused BNC connectors must have a 75
Ω
termination.
2.4.1 Data I/O
Connect the Modem and Terrestrial Data I/O to the plug-in interface switch modules in
the lower rear section of the switch. The interface switch module slots are designated A1
through A10 (left to right, viewed from the rear). A1 through A8 are slots for prime
interface switch modules 1 through 8. A9 and A10 are backup module slots 1 and 2.
Prime interface switch modules have two connectors: J1 on the top connects to terrestrial
equipment; J2 on the bottom connects to the prime modem. (See Note below.) Backup
interface switch modules have one connector, J1, for backup modem connection. Refer
to Section 4.3 for electrical specifications, and data pin-outs.
Note: For the RS-422/449/MIL-STD-188-114 interface switch modules: J1 on the left
connects to the prime modem, and J2 on the right connects to the terrestrial equipment.