Comtech EF Data SMS-458B - Manual (Page 32)

SMS-458B Modem Protection Switch Revision 2
Installation MN/SMS458B.IOM
2–6
2.3.1 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 4
(1 module for every 2 slots).
• A9 and A10 are the backup module slots (1 module for every 2 slots).
Prime interface switch modules have two sets of connectors:
• Connectors J1, J2, and J5 on the top connect to terrestrial equipment.
• J3, J4, and J6 on the bottom connect to the prime modem.
The backup interface switch module has three connectors designated J1, J2, and J3 for
backup modem connection.
Refer to Section 4.2 for electrical specifications and pinouts of the data connectors.