The Evolution Series PD25L L-Band Satellite Modem was designed for cost-critical Modem applications and discerning users who demand quality and reliability at an affordable price.
This 25Mbps capable L-Band Modem offers full compliance with IESS- 308, 309, 310, 314 & 315, plus a range of data interfaces including Ethernet. The Evolution Series Satellite Modem uses a new design concept whereby core functions are implemented with programmable logic, which allows easy reconfiguration to the needs of the user, and provides future-proof flexibility.
Ease of Operation
The Modem firmware and software is easily upgraded through an Ethernet management port, plus an innovative new menu structure makes configuration a simple procedure. Advanced user interfaces support the display of text in different languages for universal appeal, and a unique Web User Interface offers full remote control and in-depth performance analysis tools using Internet Explorer without special Monitor & Control software.
MIL 188/165A compliant
Field upgradeable feature set
4.8kbps to 2,048kbps in the base modem; options to 25Mbps
RS422, X.21, V.35, RS232 interfaces; HSSI, Serial LVDS, Eurocom D/1, Quad E1, G.703 E1/E2/E3/T1/ T2/T3 (options), Sat-Abis (optional) and Ethernet, IP Acceleration (optional)
Drop and Insert to E1/T1 (option) with extended functions: RBS, CAS
Built-in 1:1 Redundancy Controller
Embedded web server offers full M&C
DC power to the LNB (standard), DC power to the BUC
48V dc Primary Power input option
Remote Control & Web Interface
Web User Interface available via embedded web
server including (patent pending); Receive Spectrum
Analyzer, Receive Constellation Monitor, BER Tester
and graphing of Eb/No, Rx Power, BER plus other
parameters, using Internet Explorer
Ethernet with embedded web server and SNMP network management support
Outdoor Transceiver FSK Monitor and Control (option)
RS485 multi-drop addressable
M&C via Satellite ESC channel for distant control of Modems and other devices
RS232 for direct PC connection
Web User Interface
A unique Web User Interface provides full Monitor & Control plus graphing
of Eb/No, BER, Receive Power and other operating parameters, plus
a Receive Spectrum Analyser, Receive Constellation Monitor and BER
Tester for detailed signal analysis and performance validation via Internet
Explorer. Logged graph data can be sent via email to any email address.
Simple to use EZ-BERT BER Tester Option allows real time bit error
measurements through traffic or ESC channel, or between the
Built-in Spectrum Analyzer for Receive Carrier, Adjacent Carrier and Super-Wide Monitoring (3 bandwidth settings).
Built-in Receive Constellation Display
for channel diagnostics.
Paired Carrier Operation
Paired Carrier technology
allows both the uplink and
downlink signals to occupy the same space segment.
An adaptive self-interference cancellation technique
removes the uplink signal components generated by
the local terminal from the received signal off satellite,
allowing demodulation of the far end signal.
Ethernet (10/100 BaseT) IP Traffic on
RJ45 with link and traffic indicators.
Selectable with other interfaces fitted.
Traffic Interface Options
RS422 including X.21 DCE and DTE
emulation, V.35 and RS232 on EIA530 connector
25 pin female D-type (Option) EIA530 maximum
10Mbps, RS232 max 100kbps
LVDS 25 pin female D-type (Option)
G.703 balanced on EIA530
G.703 unbalanced on BNC female 75Ω
User Traffic Data Rate
4.8kbps - 2,048kbps
Extends base operation to 5Mbps (Option)
Extends 5Mbps to 10Mbps (Option)
Extends 10Mbps to 25Mbps (Option)
Extensions are cumulative
User Traffic Data
The combination of FEC Rate, Modulation scheme and Satellite Overhead limits the Traffic Data Rate Range in all modes.
User Data Rate Range - Closed Network
4.8kbps to 25Mbps no Satellite Overhead
(with high Data Rate options)
User Data Rate Range
- Minimum Overhead
(Closed Network Plus ESC)
As Closed Network above except limits inclusive
of overhead of approximately 1.4 times the ESC
baud rate. Resolution of 1bps. Supports ESC
rate from 110 baud to >38.4 kbaud.
User Data Rate Range - IBS/SMS Option
4.8kbps to 10 Mbps (6.7% Satellite Overhead
added). Resolution of 1 bps.
User Data Rate Range - IDR Option
4.8kbps to 10 Mbps (96k overhead added)
Resolution of 8k (limitation of frame structure)
Audio Channels Option (P1348 emulation mode)
Used with IBS/SMS satellite framing and IDR
Options to provide 2 x audio 32kbps ADPCM
coded channels within a 64kbps IBS carrier, and 2 x
audio 32kbps ADPCM coded channels plus 64kbps
data within a 128kbps IBS carrier
Inner Forward Error
Viterbi BPSK/QPSK/OQPSK - Rates 1/2, 3/4, 7/8,
k=7 to IESS-308/309
Option: TCM 8PSK - Rate 2/3 to IESS-310
Option: TPC BPSK/QPSK/OQPSK - Rates 5/16,
21/44, 0.493 (Paradise), 2/3, 3/4, 0.789 (Paradise),
7/8 (Paradise), Rate 7/8 de facto
Options: TPC 8PSK - Rates 3/4 de facto,
7/8 de facto
Options: TPC 16QAM - Rates 3/4 de facto,
7/8 de facto
Outer Forward Error
Concatenated Intelsat Reed-Solomon Outer
Codec to IESS308/310 with Custom Option offering
variable code rate. Maximum traffic rate 10Mbps.
Synchronised to framing per IESS-309 up
to 10 Mbps
Scrambling - IDR Option and Closed Network
With RS Coding: synchronised to RS overhead.
Without RS Coding and Non-TPC FEC: V.35 self-
No RS Coding with TPC FEC: 2-12-1 up to 10 Mbps
Scrambling - Closed
Network Plus ESC
32kbps or above: synchronised to ESC overhead.
Less than 32kbps: as per closed network.
V.35 Scrambler has CCITT Intelsat "FDC" and
"Linkabit" modes up to 52Mbps (with high Data
Reference - Ageing
Clocking Only: 1-10MHz in 1kHz steps.
Clocking and RF Frequency: 10MHz, 0dBm±1dB
Output Power Level
-5 to -30dBm Continuously Variable in 0.1dB steps
Output Level Stability
Intelsat IESS compliant. a = 0.35
1.2 times Symbol Rate
1.4 times Symbol Rate
Output Phase Noise
As IESS-308, nominally 3dB better.
7.5E-8/yr with High Stability Reference Option
Better than -55dBc/ 4kHz in band
No worse than -45dBc out of band to 5GHz
Better than -55dBc/ 4kHz in band
No worse than -40dBc out of band 10MHz to 5GHz
Transmit On/Off Ratio
By external contact closure or by TTL signal applied
to rear panel Alarms & AGC connector
-20 to -70dBm wanted signal
35dB above level of desired input up to a
maximum of 10dBm
Selectable from ±1kHz to ±32kHz up to
10 Mbps (1kHz steps)
±10kHz to ±250kHz from 10 to 52 Mbps
<5dB Es/No QPSK
At 9.6kbps, less than 1s at 6dB Es/No. QPSK
At 10 Mbps, less than 100ms at 6dB Es/No. QPSK
Clock Tracking Range
Intelsat IESS compliant. α = 0.35
Measured Eb/No (range 0-15dB, ±0.2dB).
Measured Frequency Offset (100Hz resolution).
Wanted signal level strength indicator centred on
the middle of the Rx. Input range.
Buffered direct AGC output for antenna tracking etc
Clocking and Buffering
Frequency Locked Loops give phase-hit immune
operation even with poor clock sources such as
7.5x10E-8/yr with High Stability Option
Tracking range ± 100 ppm/min
Slaves Tx timing from Rx clock.
(Includes full asymmetric operation)
Tx Input clock
Clock from Satellite
(Includes full asymmetric operation)
7.5E-8/yr with High Stability Option
External timing clock (DTE interface only)
75 1/2 BNC female Station Clock Connector,
1MHz to 10MHz in 1kHz steps (accepts sinusoidal
>0dBm or square-wave e.g. G.703 para 10)
120Ω RS422 compatible input, 1MHz to 10MHz in
1kHz steps via Async ESC connector
NB: When set to 10MHz, the station reference may
replace internal reference to all internal circuitry
and reference outputs on the IF ports. The unit
automatically switches back to internal reference if
the station reference fails.
Selectable in 1ms increments from 0ms to 99ms.
Automatically adjusted to slip an integer number of
terrestrial multi-frame lengths for framed rates
Buffer storage: Maximum buffer size - 256kbytes
Framing and Deframing
Closed Network Format
Unframed, no overhead.
Intelsat IBS to IESS-309 and IESS-310 up to 10 Mbps,
and Eutelsat SMS to EESS501.
IDR Option Format
Intelsat IDR to IESS-308 and IESS-310 up to
Closed Network plus
Provides variable rate asynchronous ESC, optional
synchronous scrambler above 32kbps to replace
error multiplying V.35 scrambler, optional backward
alarm facility and optional timeslot ID maintenance
when used with Drop/Insert, all in minimum
possible overhead down to <0.5%
Format of Other
For custom options, see handbook.
Deframer includes extended threshold operation
that improves performance when used with Reed-
Solomon in very poor BER conditions (where a
single uncorrectable RS codeword can contain
enough corrupt frame alignment words to knock an
Intelsat specified deframer out of frame sync).
Up to 10 Mbps