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
RS485interface. 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.
P300 / P310 -TCM Additional Features
8PSK with 2/3 rate TCM
(50% bandwidth of QPSK 1/2 rate Viterbi)
Extended D/I Feature
The extended Drop/Insert provides significant extra features compared to the basic
Drop/Insert feature set:
*
Arbitrary & independent timeslot
re-ordering
for Drop & Insert
*
Full support for G.732 Channel Associated Signalling (CAS) over IBS/SMS
links
*
T1-D4 & T1-ESF Robbed Bit Signalling (RBS) maintenance over IBS/SMS links
*
Maintenance of timeslot ID for
N=1 to 31
inclusive when using
any
framing
(normally only N=1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24 are maintained for
IBS/SMS and there is no ID maintenance for IDR)
*
Insertion of only partial received data (for multi-destinational working)
