Comtech EF Data OM20 - Manual (Page 217)

OM20 Universal Outdoor Modem Appendix G
MN-OM20– Revision 5 H–3
There are safeguards built into the AUPC System. First, the modulator has two parameters,
which allow control of the maximum and minimum output power Levels. Second, a nominal, or
default, power level is specified which takes effect if the receive signal or messaging is lost.
This nominal power should be set to a level high enough to re-establish communications
regardless of rain fade.
EF AUPC, also provides some control over the rate of power change; while the Radyne and Near
Side AUPC use a optimized rate for rain fade compensation.
The AUPC Menu Functions and their descriptions are shown on Table H-1 ands H-2.
Table H-1. Local AUPC Functions
Function AUPC Available Options Description
AUPC MODE DISABLE, NEARSIDE, RADYNE,
EFDATA
Enables/Disables the AUPC to function
locally
NOMINAL POWER -20 TO -45 dB Sets default output power to be used
MINIMUM POWER -20 TO -45 dB Sets minimum output power to be used
MAXIMIM POWER -20 TO -45 dB Sets maximum output power to be
TARGET Eb/No 4.0 TO 16 dB Desired E
b
/N
0
of remote modem
TRACKING RATE 6.0 to 0.5 dB/MIN Adjustable in .5dB increments
LOCAL CL ACTION HOLD, MAXIMUM, NOMINAL Allows user to determine what power
setting the remote modem will use in
the event of a carrier loss at the local
side.
REMOTE CL ACTION HOLD, MAXIMUM, NOMINAL This setting allows users to determine
what local output power setting to use
in the event that the remote end has a
carrier loss.
1. The AUPC Menus are located under the Modulator Menu as shown in Section 4.
2. The EF AUPC Menu displays when EFAUPC Framing is enabled in the Demod and Mod set up menus.
3. Highlighted areas are activated when modem is set to EF AUPC
Table H-2. Remote AUPC Functions (EF AUPC Only)
Function AUPC Available Options Description
AUPC MODE Disable, EFDATA Enables/Disables the AUPC to function
remotely
LOOPBACK Enabled/Disabled Loop back test over satellite link
TX 2047 TEST BER Enabled/Disabled Initiates 2047 Test pattern BER Test
RX 2047 BER Status Menu Identifies the BER status on the distant
RX side
AUPC DEF LVL Sets default output power to be used
The Remote AUPC Menus are only supported by EFAUPC