Comtech EF Data RCS20 - Manual (Page 83)

RCS20 M:N Redundancy Switch Revision 15
User Interfaces MN-RCS20 and CD-RCS20
4–49
4.3.2.24 REFERENCE DISTRIBUTION CONFIGURATION
This screen displays the configuration of the optional Reference Distribution Module Expansion Card
(RDM), located at the rear of the RCU20. The following are two configuration parameters for the RDM:
Fallback Programming - The fallback programming determines how the three frequency sources (External
A, External B, Internal) are automatically selected when any of the sources are removed.
Internal Reference Frequency - The internal frequency selects the frequency of the internal reference.
The line directly above the FALLBACK Line displays the current source with '***'. This line will display the
message NO RDM PRESENT if the RDM is not installed in the RCS20 system.
4.3.2.24.1 Programming steps:
1. Press to cycle to the RDM FALLBACK CONFIGURATION Screen for fallback
programming configuration.
2. Press to cycle to the RDM INTERNAL REFERENCE CONFIGURATION Screen for
internal frequency reference configuration.
Key Label Function
S1 FALL Press to cycle to the RDM FALLBACK CONFIGURATION Screen.
S2 FREQ Press to cycle to the RDM INTERNAL REFERENCE CONFIGURATION Screen.
S3 --- N/A
S4 NEXT Press to cycle to the next screen.
Numeric Keypad --- N/A
REFERENCE DISTRIBUTION CONFIGURATION
NO RDM PRESENT
FALLBACK : EXTA ONLY
INTERNAL FREQ : 10.0 MHZ
( ‘***’ INDICATES CURRENT SOURCE)
FALL FREQ NEXT