Paradise Datacom P300 Series Installation & 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)
P300H P300 Series Modem Installation and Operating Handbook Page 13