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P300H P300 Series Modem Installation and Operating Handbook Page 123
Options displayed on the second screen include all of the above, plus:
D/I (L) The data is looped back after the Drop mux, through the Doppler buffer, back into
the Insert mux providing a local loop only. The Tx data continues to be transmitted
and the Rx data from the satellite is ignored. If Drop/Insert baseband processing
is not active, this loops the data at the output of the baseband block (ie it works
even if Drop/Insert is not active). ESC & Aux channel data is NOT looped.
FRM (L) The data is looped after the Framer back into the Deframer providing a local loop
only. The Tx data continues to be transmitted and the Rx data from the satellite
is ignored. ESC & Aux channel data (which is present in the data stream at the
Framer output) is also looped
RS (L) The data is looped after the Reed-Solomon Encoder / interleaver back into the
RS Deinterleaver / decoder providing a local loop only. The Tx data continues to
be transmitted and the Rx data from the satellite is ignored. ESC & Aux channel
data (which is present in the data stream at the RS codec) is also looped
From the terrestrial port towards the IF ports the loopbacks in the following order test more and more
circuitry: Interface, Drop/Insert, Framer, Reed-Solomon, FEC, IF.
REMOTE (R) This provides a loop of the Rx data after the deframer back into the framer. Tx
input data is ignored, Rx traffic continues as normal. Incoming ESC & Aux channel
data is not looped back to the remote site.