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RCS11 1:1 Redundancy Switch
2.2.2 Configuring the RCS11 (Refer to Figure 2-1)
The purpose of the 'ENABLE' pushbutton on the front panel is to reduce the risk of accidentally
changing the operating modes of the RCS11 by accidentally bumping any one of the front panel
pushbuttons. For any one of the front panel pushbuttons to function, the 'ENABLE' pushbutton
must be depressed simultaneously with the desired function pushbutton.
Depress the 'ENABLE' pushbutton. This pushbutton must be depressed to allow the operator to
proceed with any other configurations. The 'MANUAL' LED should illuminate and the FAULT
indicator may momentarily flash. Under the MOD region of the front panel, depress 'SELECT A'
to bring Modem 'A' modulator online. The green LED should illuminate. Under the DEMOD
region of the front panel, depress 'SELECT A' to bring modem 'A' demodulator online. The
Green LED should illuminate. The RCS11 should now be in backup mode with modem 'A' online.
2.2.3 Manual Mode
To manually select which MOD or DEMOD is to be placed online, simultaneously depress the
'ENABLE' pushbutton and the appropriate MOD or DEMOD 'SELECT' pushbutton. When a MOD
or DEMOD selection is made, the RCS11 enters Manual Mode to carry out the selection, and will
not respond to either modem's MOD or DEMOD Fault signals until placed back into Auto Mode.
2.2.4 Auto Mode
To enable automatic backup in the event of a MOD or DEMOD failure, the RCS11 must be
placed into the Auto Mode. First, select which MOD and DEMOD are to be active by following
the 'Manual Mode' procedure in the previous paragraph. To enter the Auto Mode, simultaneously
depress the 'ENABLE' pushbutton and the 'SELECT AUTO' pushbutton. The RCS11 will then
enter into Auto Mode with the last selections made in Manual Mode. In the Auto Mode, the
decision to switch from one MOD or DEMOD to another is made automatically by monitoring the
Fault signals from each modem.
2.2.5 Power-Up Defaults
During power-Up, the RCS11 initializes itself to the last mode set by the operator on the front
panel pushbuttons. For example, if the operator desires the RCS11 to operate in the Auto Mode,
with both Mod and Demod set to Modem B, by placing the RCS11 into this condition using the
front panel pushbuttons, the settings are stored into non-volatile memory. If MOD B was to fail,
and the RCS11 was to backup with MOD A, the new backup setting would not be saved. If the
power was to be removed and restored, the RCS11 would again power-up in AUTO MODE, with
both MOD and DEMOD set to Modem B.
2.3
RCS11 Major Assemblies
The RCS11 Redundancy Control Unit contains the modules that control and monitor the
operation of the 1:1 Switch system. The 1:1 Switch is composed of the following major
assemblies and components:
Main Switch Board
Front Panel Board
Dual Redundant Power Supplies
MN-RCS11 – Revision 9
Theory of Operation
2–2
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