P300H
P300 Series Modem Installation and Operating Handbook
Page 32
[Monitor/AGC Option]
Facilities Provided
Demodulator Rx carrier signal monitoring & level display ( 5dB)
0 -10 V Analog output (Signal level, Eb/No or Rx offset frequency)
Buffered constellation monitor port
Sounder for audible feedback from keyboard
Traffic Log
Capacity
Total 500 entries
Entry Format
Fault message with time & date. Separate entry when fault clears/
changes
Automatic Entries
Average & minimum Eb/No
(user defined
Average & minimum estimated user BER
interval)
Buffer fill status
Average & 1 minute minimum measured BER from PRBS tester (may
run continuously through ESC or Aux channel for continuous traffic
quality monitoring)
Interrogation method
View on front panel LCD, Print to rear panel serial port (`D` type) either
all entries or just unprinted entries read over remote M&C bus
[Auto Uplink Power Control] (AUPC)
Modes of operation:
Monitor of distant Eb/No & BER only, Full distant Eb/No maintenance,
& Self monitor (broadcast) modes. Unidirectional or bidirectional
operation.
Communication link:
Utilises async ESC channel on IBS/SMS, IDR and Closed Net Plus
ESC carriers (ESC from 300Baud, ie overheads down to <1%).
User parameters:
Target Eb/No, Tolerance window, Max & Min delta powers, Slew rate
limit, comms loss action (freeze, max or nominal power).
Ancillary features:
Automatic logging of distant Eb/No and local AUPC delta power at user
controlled intervals in traffic log.
Automatically interleaves AUPC messages with distant end remote
M&C (if active) on ESC channel.
Independent Max &
Min
delta powers (ie facility to
reduce
power & still
maintain quality of service with good atmospherics) allows power
balancing on transponders with traffic to varied destinations.
Common Specifications
Loopbacks
Interface Loop (local & remote)
Drop/Insert Loop (local)
Framer Loop (local)
