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P300H P300 Series Modem Installation and Operating Handbook Page 125
Internal BERT: 1=Off 2:Channel [ESC]
3:Pattern[2^15-1] 4:Mode[Manual] 5:Results
Test, Internal BERT Menu
6.16.4 Test, INT' BERT Menu (Software>V2.34)
The internal Bit Error Rate Tester (BERT) is only available if the `PRBS Tester` feature is available
(standard on P300-IDR and above). It is a powerful feature capable of monitoring and Auto-Logging the
BER of the receive satellite path, even while the main data channel of the link is carrying normal traffic. It
allows a test pattern to be sent and received in either this main data channel, or in parallel with the main
data channel in the ESC or Aux channels carried within all satellite overheads.
The BER tests can either be selected to be manually controlled (using Stop/Start/Reset, running for up to
27 hours), or to run continuously using a 1 minute sliding window. When Auto-Logging of the BER Tester
results is enabled, the tester executes a test for the user set BER Auto-Log period (1-9999 minutes), and
records both the average and 1 second worst case BER's in the traffic log of the modem at the end of the
period. It then automatically re-starts a new test for the following period.
It may operate independently, or in conjunction with external BER equipment as the test patterns it uses are
intentionally Firebird compatible. For example at one end of a link the internal BERT may be used to inject
the PRBS and measure the Rx BER, while at the other end a Firebird is connected to the Main data port,
or the ESC/Aux ports on the IDR Option (if fitted).
Each of the menu options is described in turn, with most other options appearing in a subsection below
along with a description of the submenu they display.:
OFF This disables the internal BER Tester, removing it from the channel in use, ie the
Main, ESC, or Aux channel, restoring normal operation.