PSM-500 Series

Datum Systems' latest satellite modem implementation represents state of the art enhancements to the popular PSM-4900 series of modems at the industry’s lowest price. The new PSM-500 series incorporates all of the features of the PSM-4900, and adds 8PSK, 8QAM and 16QAM modulation modes, a standard Reed-Solomon and IBS multiplexer and higher data rates. The multiplexer’s overhead channels provides the capability for orderwire, AUPC and Remote Modem Control to every modem. The PSM-500 series is available in IF versions for 70 MHz, I40 MHz and L-Band applications. PDF Version of this page.

To provide capabilities consistent with customer needs, the PSM-500 may be purchased with 3 upgradeable "Feature Sets", the M505, M511 and M523. Each offers a combination of modulation modes and data rates as shown below designed to match the needs of various users without paying for features not needed. In addition a user can upgrade a modem from one version to another at a very nominal cost when requirements change.

	The *M505* Feature set is designed as a direct replacement for the PSM-4900 modems. It’s data rate and modulation modes are almost the same, plus it has a built-in IBS Multiplexer and Reed-Solomon capability. If the requirement is to add to existing systems using QPSK modulation and either Viterbi, Reed-Solomon or TPC then this is the right modem.
	The *M511* Feature set fits the requirements of users who need higher data rates up to 10 Mbps, and/or 8PSK with Trellis Code modulation. The built in Reed-Solomon allows it to operate in the normal 8PSK, TCM, (Reed-Solomon with TCM at Rate 2/3) without anything additional needed. This is a good general purpose modem able to meet the needs of Teleports, users whose carriers require 8PSK to minimize bandwidth, and those transmitting video signals. With an optional TPC card the 8PSK mode can be operated at rates 1/2. 3/4, 5/6 and 7/8
	The *M523* Feature set adds data rates up to 20 Mbps and 16QAM modulation. This modem can provide wideband outbound signals for large Star Networks, or a large channel point to point.

Upgrades from one version to another are accomplished by software/firmware loaded into the modem via a new USB connection on the modem rear panel.

There are currently two types of hardware options available for the PSM-500 series: FEC Cards (TPC and S-Tec) and Interface Cards (Ethernet and HSSI). The TPC and S-Tec are plug in cards to the main modem board and can be either a 4k block Turbo Product Codes FEC (as in the PSM-4900) or a newer 16k block Turbo Product Codes FEC with higher performance (backward compatible with the PSM-4900). The Interface option card can be either HSSI or Ethernet. The Ethernet interface can be either the older “SDMS” type card or the new Satellite Network Interface Processor, or “SnIP”. The SnIP can also be stacked with the HSSI card for a dual option.

PSM-500 Series IF Interface Versions.

Interface Versions		PSM-500S	PSM-500N	PSM-500L	PSM-500H**
	IF Transmit	50 ~ 90 MHz	100 ~ 180 MHz	950 ~ 1750 MHz	50 ~ 90 MHz
	IF Receive	50 ~ 90 MHz	100 ~ 180 MHz	950 ~ 1900 MHz	950 ~ 1900 MHz

** Note: The Hybrid version production is dependent on demand.

PSM-500 Series Feature Matrix.

		Original M5	New PSM-500S/N/L Series
Feature Set		PSM-4900	M505		M511		M523
Modulation
	BPSK
	QPSK
	OQPSK	N/A
	8PSK/QAM-TCM	N/A	Upgrade
	16QAM/APSK	N/A	Upgrade		Upgrade

Max Data Rate		M523 rates slightly higher at higher FEC rates
	BPSK	2.46 Mbps	2.5 Mbps	5 Mbps		7.38 Mbps
	QPSK/OQPSK	4.92 Mbps	5 Mbps	10 Mbps		14.76 Mbps
	8PSK/QAM-TCM (note 1)	N/A	N/A	10 Mbps		29.52 Mbps
	16QAM/APSK	N/A	N/A	N/A		29.52 Mbps

FEC Modes
	Disabled	N/A
	Viterbi
	Reed-Solomon	Option
	TPC – 4K (note 2)	Option	Option	Option		Option
	TPC – 16K (note 2)	N/A	Option	Option		Option
	S-Tec (note 3)	Option	Option	Option		Option

IBS Mux/AUPC		Option

SnIP Ethernet Int.		Option	Option	Option		Option

Notes:

With the standard Viterbi/TCM and Reed-Solomon FEC card, 8PSK will only operate at rate 2/3 with TCM by convention. 8QAM will not operate with Viterbi or TCM and requires a TPC option.
Adding the TPC-4k FEC will allow 8PSK/8QAM operation at rates 3/4, and 0.95.
Adding the TPC-16k FEC will allow 8PSK/8QAM operation at rates 3/4, 7/8 and 0.95.
The 4k Block TPC chip is limited to a maximum of 5 Mbps operation. The 16k Block TPC chip is able to operate to a full 29.52 Mbps.
The S-Tec FEC is expected to be limited to approximately 10 Mbps operation.

Features Common to All Modems in Series

	Programmable modulation modes.
	Programmable receive acquisition/tracking range.
	Typical DSP acquisition time of 315 mSeconds at 9.6 kbps QPSK, 71 mseconds at 64 kbps QPSK.
	Viterbi and Reed-Solomon FEC standard, TPC optional. BER vs. Eb/No performance within 0.3 dB of theoretical. 10-7 BER at 6.0 dB Eb/No (2.8 dB with TPC, 3.5 dB with Reed-Solomon codec).
	DDS transmit and receive frequency setting in 1 Hz increments.
	Programmable Interface type.
	Low power, light weight 1 U case.
	Built-in IBS Multiplexer with overhead channel, AUPC and Remote Modem Control.
	Built-in BER Test Set. Now able to operate to line side of data interface as a DTE.
	DDS setting of transmit and receive data rates from 1.2 kbps to 20 Mbps in 1 bps increments.
	Viterbi FEC codec programmable to rate ½, ¾, 5/6, 7/8 and disabled. Rate 2/3 in 8PSK/TCM.
	Wide AGC range.
	Full front panel control with keypad, LCD display and LED status.
	Fully programmable from either front panel or remote command without jumpers.
	Built-in 1:1 Redundancy logic requiring only an external "Y" data cable and IF splitter/combiner.
	Designed to use internal or external G.703 and Ethernet interfaces.
	8 User stored and recallable configurations. Automatic Recovery of stored configurations.

BASE SERIES SPECIFICATIONS (Preliminary)

Parameter	PSM-500
Operating Modes, all programmable:	Receive and Transmit Continuous (SCPC), Optional Tx Burst.
Transmit IF Frequency Range: Receive IF Frequency Range:	50 to 90 MHz (standard) in 1 Hz Steps. 950 to 1750 MHz, "L" version 50 to 90 MHz (standard) in 1 Hz Steps. 950 to 1900 MHz, "L" version
Transmit Output Power: (BNC Programmable 75/50 Ohm) Return Loss	+5 to -35 dBm, programmable in 0.1 dB steps (max. +3 dBm @ 50 Ohm) 20 dB minimum.
Transmit Output Phase Noise:	Better than IESS-308/309 by 6 dB typical, 4 dB minimum.
Transmit Output Level Stability/Accuracy:	±0.5 dB, 0 ~ 50°C, accurate ±0.5 dB, 50 ~ 90 MHz at 25°C
Transmit Output Spurious/Harmonics:	<-50 dBc / <-50 dBc up to -10 dBm, <-40 dBc @ + 5 dBm out
Receive Carrier Level In: (BNC Programmable 75/50 Ohm) Return Loss	-20 to -60 dBm, scales to –84 at lower data rates. Formula is: minimum = 10log(symbol rate)-120dBm 10 dB minimum.
Maximum Composite Receive Input Power	+15 dBm or +40 dBc whichever is lower power
Receive Demodulator Phase Noise:	Better than IESS-308/309 by 4 dB minimum., 6 dB typical.
Receive Acquisition Range:	Programmable from 100 Hz to 1.25 MHz in 100 Hz increments


Frequency Reference (Internal) Stability External:	2 x 10 –6 TCXO (Standard),. 1 x 10-8 OCXO in PSM-500L External reference input on rear panel for 1, 5, 9, or 10 MHz. Internal TCXO/OCXO phase locks to external input.
Modulation and Demodulation: M505: M511: M523:	Programmable for BPSK, QPSK, OQPSK, independently Adds 8PSKwith Trellis Code Modulation and 8QAM (TPC only). Adds 16QAM
Forward Error Correction: Standard Concatenated Reed-Solomon:	Viterbi standard. k=7. 4 or 16k block Turbo Product Codes optional. n=126, k=112, t=7 or n=219, k=201,t=9 or programmable, depth of 4 or 8
FEC (Viterbi or TPC) Rates Selectable:	1/2, 3/4, 7/8 or disabled. Rate 5/6 in Viterbi only, Rate 2/3 in 8PSK mode.
Data Rates Minimum, all modems at FEC rate: (without IBS mux or R-S option)	1.2 kbps rate 1/2 BPSK, 2.4 kbps, rate ¾ or 7/8 BPSK 2.4 kbps rate ½, 4.8 kbps rate ¾ or 7/8 QPSK or OQPSK 9.6 kbps all rates 8PSK, 19.2 kbps all rates 16QAM
Data Rates Maximum - M505: M511: M523: (without IBS mux or R-S option) Note – Max rate may be limited by interface	5 Mbps, all modulation modes and FEC rates. 10 Mbps all modulation modes and FEC rates – see Note below 29.52 Mbps depending on modulation mode and FEC type an rates. – see Note below Note: Maximum rate limit of 7.38 Mbps, BPSK, rate ½; M523 Maximum rate limit of 14.76 Mbps, QPSK, rate ½, 19.68 Mbps 8PSK rate 2/3
IBS Multiplex (Standard Built-In)	IBS framing supporting enhanced buffered RS-232/485 overhead channel, AUPC, remote modem control and variable overhead.
Data Rate Selection: Transmit & Receive:	Programmable in 1bps increments. Accurate to 2 x 10E-12 (relative to reference).
Receive Data FIFO Buffer: Plesiochronous or Doppler Elastic Store	4 bits to 524,280 bits, programmable in 1 bit increments, or in delay time.
Data Interface (All synchronous).	RS-449/422 or V.35 or EIA-530 or RS-232 electronically selectable at DB-37 connector. DB25 and V.35 (M34) adaptors available.
BER Performance: with Viterbi FEC ½ rate: ½ rate Viterbi +R-S Concatenated FEC: ¾ rate Viterbi +R-S Concatenated FEC: ½ rate Turbo Product Codes FEC: ¾ rate Turbo Product Codes FEC:	10-7 at 6.0 dB Eb/No, 10-5 at 4.8 dB 10-7 at 3.7 dB, 3.5 dB typical (n=126, k=112) 10-7 at 4.7 dB, 4.5 dB typical 10-7 at 3.0 dB, 2.8 dB typical 10-7 at 3.7 dB, 3.5 dB typical
Fast Receive Lock Performance at FEC rate ½, 6.0 dB Eb/No, +/-30kHz acquisition range: (Average)	315 msecond at 9.6 kbps QPSK or 175 msecond at 9.6 kbps BPSK . 71 msecond at 64 kbps.QPSK
Front Panel Control:	LCD display and keypad provide full status and programmability.
Remote Control: Terminal Mode: Packet Mode:	Full screen live display and interactive control of all operating parameters and status.