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Description
Cabling Specification Appendix; Operating Personnel would use the Operations Chapter to become
familiar with the Modem; while System Programmers would use the Remote Control Protocol to
determine control requirements.
The PSM-500, 500L and 500LT modems are fully interchangeable with the single exception of the IF
input frequency range. In addition all options available for the PSM-500 are usable with the L or LT
version. The term PSM-500 is used throughout this manual where references apply to either the
PSM-500, 500L or 500LT modems. Where a subject is specific to one modem the "L" or "LT" suffix is
used or the specific differences in operation between the three modem versions are detailed.
1.0.2 Quick Start for Experienced Modem Users
If you are experienced with modems, but not this particular one, you may want to skip some of the
introductory material and learn how to operate the front panel to set up the modem immediately. Go
directly to Section 3.1 – "Operating Procedures" and get a feel for how the front panel operates.
Then scan Tables 3-1 through 3-4 listing the parameters that can be changed, and set up the
modem for your application. We strongly recommend that you go back to learn more, as these
modems have extensive capabilities and features that are unique. A list of abbreviations is located at
the end of the "Frequently Asked Questions" (FAQ) in Chapter 4.
1.0.3 What's New – This Modem and This Manual
If you are familiar with Datum Systems modems, especially the PSM-4900, then you should feel
comfortable with both this modem's operation and this manual. There are some significant
differences you should review in the list below.
New in This Modem:
•
The PSM-500 series is the first to include 8PSK, 8QAM and 16QAM modulation modes,
requiring new procedures and remote control interaction.
•
The PSM-500 now includes remote control and firmware update via USB interface on the
rear panel. This was especially necessary since the 10 fold increase in firmware requires a
faster method to load new firmware configurations.
•
Each PSM-500 IF version is capable of 3 standard value software upgradeable "Feature
Sets", as described in section 1.1.2. Many features of the modem are field upgradeable
without adding new hardware. Subsets of these Feature Sets are available.
•
There are two option slots on the main PCB used for FEC/processing options. One is
always used for the standard FEC set as a minimum. They are wired in parallel like the PCI
slots on a computer, but use an SO-DIMM form factor. Please don't plug memory in!
•
The IBS multiplexer with AUPC is now standard and built into the main board FPGA logic.
•
The Reed-Solomon concatenated FEC is now standard and built into the standard FEC
card.
New in This Manual:
•
A new "How-To" Appendix is added in Appendix H. It gives quick instructions on setting up
common features and capabilities.
1.1 Modem Capabilities
1.1.1 Modem IF Variations
The PSM-500 series is currently offered with 3 main Intermediate Frequency (IF) variations
designed to meet the needs of various station types. The standard PSM-500 modem has a 70 MHz
(or optional 140 MHz) transmit and receive IF which is typical for use in large stations with indoor or
outdoor up and down converters. The PSM-500L and PSM-500LT units feature an L-Band transmit
and receive making it ideal for low cost Vsat remote earth stations.
Page 1-2
PSM-500/500L/500LT SCPC Satellite Modem
PSM-500/500L/500LT - Rev. 0.91
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