Paradise P300 specifications Main, Esc / Aux, Closed Network, Ibs/Sms

6.16.5 Test, Int' BERT, OFF/CHANNEL Menu

Channel for BER Test: [ESC] 1:Main data 2=ESC 3=Aux

Test, Internal BERT, Channel Menu

The test may run through the Main, ESC or Aux channels.

MAIN	This first generates an `are you sure` screen before substituting the PRBS in
	place of the Tx main traffic channel and monitoring for errors on the Rx Main
	traffic channel. Note that for Closed Network mode only (ie no overhead at all) the
	BER Tester cannot currently inject a test pattern into the main traffic channel (a
	warning is issued on the screen). It can however receive and monitor a test
	pattern injected by equipment at the distant end of the link. On a link where it is
	necessary to use the BER Tester, switch to Closed Net Plus ESC mode, and if not
	using the ESC set it for the lowest possible Baud rate which will result in an
	overhead of <0.5%.
ESC / AUX	ESC & Aux are defined below for the different service types. If either ESC or Aux
	are selected but the channel has not been defined, then the user is prompted to
	define the channel (and must then re-select the channel from this screen).
Closed Network	ESC & Aux channels are not available in Closed Network mode (as there is
	no overhead in which to carry them).

Closed Net Plus ESC Closed Net Plus ESC mode is only available if the Async ESC feature is available (standard on P300-IBS and above). The ESC channel Baud rate is used to determine the overhead added to the main data, allowing the minimum possible overhead to be added (ie the minimum bandwidth to be used), to provide the Async ESC Baud rate required. When the ESC channel is used for BER testing the Async ESC is disabled and whatever bandwidth was assigned to the Async ESC channel is used synchronously for BER testing. The data rate to the satellite (main data + overhead) remains

	unchanged.
	There is no Aux channel facility in Closed Net Plus ESC, as this mode is
	specifically designed to minimise the satellite bandwidth used, and hence all
	overhead is assigned to the ESC channel.
IBS/SMS	IBS/SMS mode is only available if the IBS/SMS feature is available (standard
	on P300-IBS and above). The ESC channel is the channel which is normally
	used to carry asynchronous data from earth station to earth station (typically
	used for distant end M&C). When selected as the BER test channel Async
	ESC data is not passed and the channel is used synchronously for BER
	testing. It is only possible to define an ESC channel in IBS/SMS mode for the
	BER test to run through if the Async ESC feature is available (standard on
	P300-IBS and above). The ESC channel may be configured to provide rates
	up to 4.6% of the main data rate for BER testing.
	The Aux channel may be configured to provide the mandatory INTELSAT
	oversampled low rate ESC (yes `ESC` but on the Aux port of the modem).
	When used by the BER Tester it is used synchronously and provides a test
	channel of 0.2% the main data channel rate. If the IDR Option is fitted
	(standard on P300-IDR and above) which provide a synchronous external
	Aux port, then the Aux channel may be set for sync channel and to use all

P300H P300 Series Modem Installation and Operating Handbook Page 126