Specifications

PSM-500/500L/500LT SCPC Satellite Modem Description
PSM-500/500L/500LT - Rev. 0.91
Page 1-3
1.1.2 Modem Feature Set Variations
Feature sets are specific capabilities that suit a modem for a particular purpose. The PSM-500
series is the first modem Datum Systems has offered with variable feature sets. The advantage is
that a customer does not have to pay for features he does not use, but later features can be
upgraded in the field electronically by adding new firmware Intellectual property to the modem. The
user has the best of both worlds. Feature sets are purposely kept to a minimum to make their control
easy and therefore reduce the cost. There are currently only 3 main feature sets offered for the
PSM-500 series, and they apply to any of the IF variations.
For comparison, the features available in the PSM-4900 modem are also shown. More detail on
maximum and minimum data rates are shown in Appendix A.
PSM-500 Series Feature and Option Matrix.
Original M5 PSM-500S/N/L/LT Series
Feature PSM-4900 M505 M511 M523
Modulation
BPSK
�
�
�
�
QPSK
�
�
�
�
OQPSK N/A
�
�
�
8PSK/QAM N/A Upgrade
�
�
16QAM/APSK N/A Upgrade Upgrade
�
Max Data Rate M523 rates slightly higher at higher FEC rates. See Notes below.
BPSK
2.46 Mbps 2.5 Mbps 5 Mbps 7.38 Mbps
QPSK/OQPSK 4.92 Mbps 5 Mbps 10 Mbps 14.76/28 Mbps
8PSK/QAM/TCM 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 (2) Option Option Option Option
TPC – 16K N/A Option Option Option
LDPC-16k (2k) N/A Option Option Option
IBS Mux/AUPC Option
�
�
�
SnIP Ethernet Int. Option Option Option Option
There are multiple items lists as “Options”. Options are specifically hardware items that are installed
in the modem, while a “feature” is a software installation listed as an “upgrade”. To upgrade the
modem from one feature set to another refer to the instructions in Section 4.4.