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P300H P300 Series Modem Installation and Operating Handbook Page 193
ALPHABETIC FEATURE LIST
Included as standard
Feature Letter Description of Feature
P300 P300 P300 P300 P300
VSAT IBS IDR TCM User
Base Modem
A Tx path: without this the modem can be Rx only
B Rx path: without this the modem can be Tx only
P Variable rate: Variable data rate if enabled (see `R`), fixed if not (See `Q`)
S 70MHz IF interface: IF frequencies in the range 50 - 90MHz
(provides 50-180MHz if feature `T` also)
U 100Hz IF synth steps: 2.5KHz if not enabled
V Misc ASIC functions: Terrestrial CRC support & BER monitoring
Viterbi FEC
N * Viterbi FEC (to IESS 308/309), rate ½, ¾, & in BPSK, QPSK and OQPSK.
Sequential FEC M * Sequential FEC (to IESS 312) , rate ½, ¾ &
in BPSK, QPSK, OQPSK
INTELSAT
Reed-Solomon
(switches to 225, 205, 10 or 219, 201, 9 with 4/8 deep interleaving as required for IDR &
L Reed-Solomon outer FEC (to IESS 308/310), with n, k, t = 126, 112, 7
TCM/IDR if options are available)
Wideband IF
T 140MHz IF interface: IF frequencies in the range 100 - 180 MHz
(provides 50-180MHz if feature S also available)
High Data rates
enabled otherwise limited to rates between Low_Rate and High_Rate (see bottom of table).
R If data rate is Variable by feature `P`, then data rate range is 4.8kbps to 5.0Mbps if this feature
No effect if feature `P` disables variable rate
Async ESC
High rate IBS/SMS ESC (with IBS/SMS feature)
G Variable rate ESC channel for Closed Net plus ESC operation
Async ESC access to IDR 8k sync ESC channel (with IDR option).
IBS/SMS
E IBS/SMS framing (to IESS 309) with low rate INTELSAT ESC (to IESS 403).
Drop/Insert
C Normal T1/E1 linear order Drop/Insert, excludes `Odd values of N` such as N=7, 9 etc (see
feature D)
IDR ADPCM ESC channels
F * IDR operation (to IESS 308): Two audio ESC channels, Sync 8kbps ESC, Four form `C`
backward alarms.
H Aux: IBS variable rate synchronous Aux channel, IDR 32/64kbps in place of one/both audio
J P1348 emulation: Emulation of P1348 / P1448 cards popular in SNG applications. Includes
generation of 64kbps carrier from 2 x 32k ADPCM audio (using IDR Audio ESC ports), or
128kbps from 2 x Audio + 64kbps data.
PRBS Tester
K PRBS tester: Internal BERT (can run through Main, ESC and Aux channels in any o/h modes)
8PSK/TCM
O 8PSK with rate Trellis Code Modulation (TCM, to IESS 310).
Extended D/I
N` giving N=1 to 31 with IBS/SMS or Closed Net plus ESC operation. E1 CAS & T1 RBS
D Arbitrary Timeslot re-ordering on Tx & Rx paths. Timeslot ID maintenance for the `Odd values of
signalling support. Rx Partial Insert (for multi-destinational working)
Custom I Arbitrary `n` & `k` when using Reed-Solomon, Custom and Minimum Overhead framing modes,
Features Custom allocation of IBS o/h between Async ESC & Sync Aux ports.
Dual Rate when choice of Low_Rate or High_Rate is available (see below). No effect if feature `P`
Q Dual rate: If data rate is fixed by feature `P`, then fixed at Low_Rate unless this feature enabled
enables Variable rate
Turbo Codec
W * Turbo Codec inc rates ½, ¾,
& 0.789.
Later model P300 only (previously letter `W` was spare = active).
Spare
X Spare (active)
Spare Y Spare (inactive)
AUPC Z Auto Uplink Power Control (requires Async ESC feature also to function)
Low_Rate 4.8k 4.8k See features `Q` and `R` above
High_Rate 512k 512k See features `Q` and `R` above
Monitor / AGC
*
Demod Rx carrier signal level monitor. 0-10V Analog output of carrier signal level, Eb/No, or Rx
offset frequency (in addition to normal AGC output). Constellation monitor port
1544kbps G.703 1544kbps G.703 interface in addition to RS422 / V.35 / RS232 interface (software selectable).
*
2048kbps G.703 2048kbps G.703 interface in addition to RS422 / V.35 / RS232 interface (software selectable).
*
A * in the `Letter` column indicates these features require additional hardware to be fitted (eg small PCB
or `Chip`). All Other features may be added simply by entering a `Feature Code`.