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P300H P300 Series Modem Installation and Operating Handbook Page 13
P300 / P310 -IBS Additional Features
INTELSAT Reed-Solomon Feature
A fully INTELSAT compliant Reed-Solomon Codec providing
Automatic selection of appropriate INTELSAT values of `n, k & t` and interleaving depth for
data rate & service selected (n, k, t = 126, 112, 7 by default, switching to 225, 205, 10 or 219,
201, 9 with 4/8 deep interleaving as required for IDR & TCM/IDR)
Provides improved low Eb/No performance in framed mode due to use of extended threshold
frame sync algorithms
Enhanced capabilities with the `Custom Features` feature (see later)
Wideband IF Feature
The extension of the 50MHz - 90MHz IF range up to 50MHz - 180MHz
High Date Rate Feature
The extension of the data rate range to include rates above 512kbps up to 5.0Mbps (depending
on modulation and FEC modes)
Async ESC Feature
The addition of a high rate async ESC channel, which may be internally linked to the M&C port to
provide control of distant end equipment (in all overhead modes) without additional cabling. The
Async ESC feature provides as follows:
Support for any async ESC rate in Closed Net Plus ESC mode, providing a scalable overhead
which adds the minimum possible overhead to the satellite data to provide the baud rate
selected (adding from <1% to 100% overhead). Closed Net Plus ESC mode also provides an
optional backward alarm facility and above 32kbps a synchronous scrambler to replace the
normal error multiplying V.35 self synchronising scrambler.
A high rate async ESC channel in IBS/SMS overhead, achieving 2400 Baud with a 64kbps
carrier (requires IBS/SMS feature, standard on P300-IBS and above)
Async access to the IDR 8kbps synchronous ESC channel. (requires IDR option, standard on
P300-IDR and above)
Software selectable RS232, RS485 or RS422 interface.
IBS/SMS Feature
Satellite Framing in accordance with IBS (to IESS 309) and SMS (EESS 501), including:
User assigned Tx, and corresponding Rx display of, Station ID, Channel ID & Spare ID within
SMS overhead to aid carrier identification.
A high rate async ESC channel in IBS/SMS overhead (see Async ESC above)
Drop/Insert Feature
The most sophisticated Drop/Insert functions of any satellite modem whilst still maintaining
simplicity of configuration and operation. The Drop/Insert feature provides:
1544 kbps T1-D4 & T1-ESF and 2048 kbps G.732 operation
Arbitrary & independent timeslot selection for Drop & Insert
Full support for CRC-4 in G.732 mode and CRC-6 in T1-ESF mode
Terrestrial error monitoring based on Frame Alignment Words (FAW) or CRC
G.732 `E bit` processing, allowing the display of the outbound terrestrial error rate
Loopthrough or generation of local bearer onto which to insert the Rx data from any normal
clock source (eg station clock, clock from satellite, internal clock)
Automatic generation of backup bearer so Rx traffic is not lost if Drop bearer into Tx fails and
bearer is looped through to the Insert mux to pick up Rx data
Timeslot ID maintenance even with Closed Net Plus ESC carriers
Enhanced features with the Extended D/I Feature (see later)