Paradise Datacom P300 Series Installation & Operating Handbook page 15

`Custom Features` Feature
With respect to the Reed-Solomon, the Custom Features provides:
* Codeword length (`n`) variable from 60 to 255
* Error correct bytes (`t`) variable from 2 to 20 in steps of two
* Selectable 4 and 8 depth interleaving
With respect to the Framing, the Custom Features provides:
* Custom IDR Modes including 16kbps ADPCM mode providing all normal IDR
facilities in a 64kbps overhead, or all normal IDR facilities plus a 32kbps Aux
channel in the normal 96kbps overhead (which allows an internal or external
PRBS test to run in parallel with the traffic to monitor the service quality). The
overhead can also be reduced to provide reduced IDR facilities with 64kbps or
32kbps overheads.
* Custom IBS/SMS modes including facilities for multidestinational IBS carriers
with 4 backward alarms, and Minimum Overhead modes (a more configurable
version of Closed Net Plus ESC) where the overhead varies from the standard
16/15 (6.7%). In minimum overhead mode the user sets the required ESC
Baud rate and the overhead is scaled to the minimum value to provide the
service required. For example 2048kbps with 9600 Baud ESC in overhead of
<1%, or 64kbps data with ESC rates up to 38.4kBaud
With respect to the ESC Channels
* Full user allocation of the overhead between ESC and Aux channels in
IBS/SMS modes, providing user control over the relative rates of the async
ESC channel and the sync Aux channel.
st
1 Generation Turbo Product Code Forward Error Correction (TPC FEC)
Turbo codec for bandwidth and power efficiency
Software can support up to 31 preset code rates (initial rates includes rate1/2, 3/4, 7/8 &
0.789)
3/4 Rate for compatibility with industry De-Facto Turbo.
1/2, 3/4, 7/8 Rate allow switch to Turbo & better margin / quality of service than Viterbi
in same space segment (eg fixed capacity on long lease)
0.789 rate provides optimised performance near 3/4 rate for newer circuits.
nd
2 Generation Turbo Product Code Forward Error Correction (TPC FEC)
Y
8PSK with rates of 3/4 and 7/8
Y 7/8 Rate for compatibility with industry De-Facto Turbo.
Monitor / AGC Option
Monitor and display of Rx carrier level
Rear panel PSK constellation monitor point
An uncommitted 0-10V DC analogue output, set from the front panel to output
AGC/Signal level (for antenna pointing / tracking), Eb/No, user BER or any other
parameter available internally.
Auto Uplink Power Control (AUPC) Feature
AUPC via async ESC channel on IBS/SMS, IDR and Closed Net Plus ESC carriers (ie
overheads down to <1%).
Automatically Interleaves AUPC with distant end remote M&C (if active) on ESC
channel.
Monitor only option for distant end Eb/No & BER monitoring without power control.
Adds optional automatic regular logging of AUPC delta power and distant end Eb/No.
Uni-directional, bi-directional and broadcast (Tx only / self monitor) modes.
P300H P300 Series Modem Installation and Operating Handbook Page 15