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10–1
Chapter 10. REDUNDANCY
Redundancy is built into the modem and can be enabled using the FAST optioning.
Redundancy can be selected so as to perform back up in the following scenarios:
• 1:1, (one modulator for one modulator), (one demodulator for one
demodulator), (one modem for one modem)
• 1:2, (one modulator for two modulators), (one demodulator for two
demodulators)
• 1:3, (one modulator for three modulators), (one demodulator for three
demodulators)
Location of the modules in the chassis is critical for correct operation of the redundancy
functions. When single modules are being backed up the back up unit must be located in
the lower right-hand slot as viewed from the rear. When modules grouped as modems
are being configured as redundant the back up modem has to be located in the right hand
column of slots, with the modulator on top.
If a 1:1 modulator and a 1:1 demodulator configuration is desired, group the boards as
modems and set up as described above.
Redundancy switching is implemented after the data interface. This means that the unit
or units designated as the back ups do not require a data interface that matches the online
units or an interface at all to operate as a back up.
Note: CEFD recommends that at least one extra interface be purchased, so that if an interface
should fail in the field the interface can be replaced. This is easily accomplished by removing the
modulator or demodulator, removing four screws, replacing the interface and reinstalling the four
screws.