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P300H P300 Series Modem Installation and Operating Handbook Page 30
Others IBS & Closed Net plus ESC facilities as before installation of IDR option,
but now on ESC port on IDR card not shared ESC/Aux port of base unit.
Aux Port RS232 or RS422 (software selected). Provides Clock and Data lines.
IDR Provides 32 or 64 kbps access in place of one or both Audio ESC
channels.
IBS INTELSAT low rate ESC mode as previously but now via Aux port on IDR
card not shared ESC/Aux port of base unit. IDR option also adds sync
IBS mode, configurable to use between 1/32nd and 21/32nd of the IBS
overhead providing a full sync Aux port at between 0.2% and 4.3% of
main data rate.
Aux port provides satellite timing information for P1500 Slave Frequency
Standard when not configured for Aux data access.
P1348 Emulation The IDR Option includes the facility to emulate the more common modes
of our popular P1348 / P1448 voice / data mux cards which are used
extensively in SNG applications. It uses the IDR audio ESC ports for the
audio interfaces and can generate a 64 kbps carrier consisting solely of
two 32kbps ADPCM encoded audio channels, or a 128 kbps carrier
comprising the two audio channels plus 64 kbps data from the main
interface. This is compatible with a P400 Series modem fitted with P1448
card or a P230 Modem with a P1348 card, alternatively Drop/Insert can
be used at the distant end to place the two 32kbps ADPCM audio
channels in one timeslot and the 64 kbps data in another.
[PRBS Tester Feature]
BER Channel PRBS tester may operate through either main traffic, ESC data, or AUX
data channels (main traffic channel not available in Closed Net, ie no
overhead mode). Use of ESC & AUX data channels allow continuous
real traffic BER performance monitoring on links with overhead.
Test Patterns 2047, 2 -1, 2 -1, compatible with common stand alone BER testers.
15 20
Results Display of error count & average BER
Autolog Automatic logging of average and 1 minute worst case BER at user
specified intervals (1 min - 24 hours)
[Monitor/AGC Option]
Facilities Provided Demodulator Rx carrier signal monitoring & level display (±5dB)
0 -10 V Analog output (Signal level, Eb/No or Rx offset frequency)
Buffered constellation monitor port
Sounder for audible feedback from keyboard
Traffic Log
Capacity Total 1000 entries