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P300H P300 Series Modem Installation and Operating Handbook Page 29
ESC/Aux Port A single port provides the interface for optional high rate async ESC
(IBS/SMS or Closed Net plus ESC), or the INTELSAT low rate async IBS
ESC channel.
Electrical Interface RS232, RS422, or RS485 external interfaces or internal link to Remote
M&C port (software selected). No external cabling required between the
ESC and M&C ports for M&C via ESC channel within overhead. Other
devices externally wired in parallel with M&C port can also be accessed
remotely.
Aux Data Channel
IBS INTELSAT low rate async ESC definition carried in bit 1 of TS32
providing a synchronous channel at 1/480th of the data rate, allowing up
to one quarter of this rate for oversampled async data. Compliant with
INTELSAT IESS 403 low rate ESC definition.
[Async ESC Feature]
Closed Net plus ESC Overhead scales to provide any user specified async ESC Baud rate
whatever the satellite data rate. ESC limit is approx 70% of main channel
rate, overhead varies from <0.5% to >70%
IBS/SMS High rate async data using from 1/32nd to 22/32nd of the IBS overhead,
providing async baud rates from 0.2% to 5.1% of the terrestrial rate (eg
up to >2400 Baud at 64 kbps). Includes modes compatible with the P400
Series, P230 & P1300/P1361 (using 20/32nd of the overhead).
[IDR Option]
IDR ESC Audio Interface Two 32 kbps ADPCM channels, 4 wire 600 , +7dBm to -16dBm
(software programmable in 0.1dB steps)
Backward Alarms Outputs: Four `form C` relays
Inputs: Four protected inputs, short to 0 V to send alarm, with matching
summary Rx fail output. Alarm inputs software configurable for:
a) all external patch
b) 1=Rx fail & 2-4=External Patch
c) 1=Rx Fail & 2-4=OK
d) 1-4=Rx Fail.
ESC/Aux Ports When the IDR option is fitted, independent ESC & Aux ports on the IDR
option replace the single shared ESC/Aux port of the base unit.
ESC Port RS232, RS422, or RS485 external interfaces or internal link to Remote
M&C port (software selected). No external cabling required between the
ESC and M&C ports for M&C via ESC channel within overhead. Other
devices externally wired in parallel with M&C port can also be accessed
remotely. Provides Clock, Data, & Sync (Octet timing) lines.
IDR Synchronous access to 8 kbps IDR ESC. With the Async ESC feature
(standard on P300-IBS and above) async ESC access to the 8kbps IDR
ESC is provided, giving up to a 9600 Baud async channel