Comtech EF Data SDM-300A - Manual (Page 288)

SDM-300A Satellite Modem Revision 6
ASYNC/AUPC Interface MN/SDM300A.IOM
11–6
11.2.1.1 Remote AUPC
This feature allows the user to monitor and control a remote modem location using the
front panel or serial port of the local modem. The operator can set or reset the following
commands:
• Baseband loopback
• TX 2047 pattern
• AUPC enable
11.2.1.1.1 Remote Modem AUPC Configuration and Monitor
The menu for this feature is remote AUPC, which is at the same level as the
Configuration and Monitor menus. The menus are structured as follows:
Menu Description
Function Select Remote AUPC Press <ENTER> to proceed.
Remote AUPC Configuration Press <ENTER> to proceed.
AUPC Enable Select On to enable Remote AUPC.
B-Band LoopBack Select On to place the unit at the distant end of the link in
loopback.
TX 2047 Pattern Select On for the distant end to TX a 2047 pattern. Select Off to
stop the pattern distant end.
Remote AUPC Monitor Press <ENTER> to proceed.
2047 Error This indicates the BER at the distant end measured from the 2047
pattern. This requires that the 2047 pattern is tuned On at the near
end.
11.2.2 Self-Monitoring Local Modem AUPC Control
This AUPC mode allows the modem to adjust its carrier power to maintain a target
Eb/No while it monitors its own carrier returned through the satellite. This is often used
in broadcast applications where a hub maintains control of the outbound carrier that is
delivered to many remotes. This requires that the Earth Station is located within the
satellite footprint.
The self-monitoring AUPC does not require any special hardware or software options.
However, if the Overhead Card or Reed-Solomon Cards are installed, do not select either
the ASYNC or AUPC from the Modem Type menu located under the Utility: Modem
Type menu, because these are used for AUPC between two modems.
To setup the modem for the self-monitoring operation, enter the Local Modem AUPC
menu located under the Utilit: Modem Type menu and select On. This enables the
Configuration: Local AUPC menu to permit adjustment of the AUPC parameters
described in Table 11-1.