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P300H P300 Series Modem Installation and Operating Handbook Page 14
P300 / P310 -IDR Additional Features
IDR Option
Satellite Framing in accordance with the IDR specification (to IESS 308), including:
Standard IDR framing with 2 x 32 kbps ADPCM audio ESC, a synchronous 8kbps ESC data
channel, and four backward alarms
Enhanced features with the ‘Custom Features’ feature (see later)
Independent ESC & Aux Ports to replace the shared ESC/Aux port of the base modem. The
ESC and Aux ports are active in all framed modes. They provide the following features::
ESC Port provides a front panel selectable RS232, RS422, or RS485 interface. In IDR
Mode it provides either a synchronous interface to the 8kbps IDR ESC channel, or (if the
Async ESC feature is available, standard on P300-IBS and above) an async interface
supporting up to 4800 or 9600 Baud eg for distant end M&C via the IDR overhead. This
same ESC port, although part of the IDR option, in Closed net Plus ESC or IBS/SMS
modes provides a high rate asynchronous ESC interface (eg 2400 Baud at 64kbps in
standard IBS/SMS mode, any Baud rate for Closed Net Plus ESC). Again typically used
for distant end M&C via the overhead.
Aux Port provides a front panel selectable RS232 and RS422 interface. In IDR Mode it
provides synchronous 32 or 64 kbps channel in place of one or both the 32kbps ADPCM
ESC audio channels. In IBS/SMS & Minimum Overhead modes it provide a synchronous
port which can be configured to use from 1/32 to 21/32 of the IBS/SMS overhead (eg for
internal or external BER testing). When set to 1/32 and used asynchronously it provides
the INTELSAT compliant Low Rate ESC channel.
PRBS tester feature
The internal Pseudo Random Binary Sequence (PRBS) Bit Error Rate Tester (BERT) offers the
following features:
PRBS can pass through the main data channel, or the ESC or Aux channels of the overhead
in parallel with the main data channel in any mode where overhead is added.
BERT results can be logged in the traffic log at user set intervals, providing continuous traffic
quality monitoring and recording when operating through the overhead in parallel with the main
data.
Compatible with patterns used by test equipment such as the Firebird etc.