M7/M7L/M7LT Modular Satellite Modem
Operation
M7/M7L/M7LT - Rev. 0.05
1-5
1.0
Introduction
1.1.
M7 Modem Description
The Datum Systems M7 series modular satellite modems (Figure 1-1) represent a major extension to
our seventh generation of innovative design concepts, proven and refined over fifteen years of
production. The M7 series modems are capable of independent transmit and receive of BPSK,
QPSK, OQPSK, 8PSK, 8QAM and 16QAM modulated carriers. The M7 series uses the latest Digital
Signal Processing (DSP) technology and proprietary techniques to provide unsurpassed performance
at a low cost. The M7 series is a highly modular design made possible by higher integration and
smaller size. Impressive features are highlighted by this design methodology:
The Standard chassis is a half-
rack 1U (1.75” H x 9.75” W x 12” D)
Individual cards within the chassis are replaceable to create multifaceted functionality
Half-rack chassis can be combined to create multiple modems within a single rack unit
Figure 1-1
– M7 Series Modems
The M7 series is available in standard 50-180MHz IF or 950-2150MHz L-Band versions with
upgrade
able “feature sets” within each version.
All M7 series modems encompass significant performance improvement over previous modems at
reduced cost. All options in the M7, M7L and M7LT modems are fully interchangeable with the
exception of the IF input and output frequency range which is selected and factory installed at the
time of order.
The M7 is designed for service in a variety of satellite systems and network types. Carrier operating
modes may be dedicated or shared. In a dedicated system two modems are set for continuous
operation with each other, but in shared systems the modem carriers are typically controlled by a
Network Management System (NMS) and operating in a controlled acquisition mode.
The M7 is designed to be easily integrated into either a master hub station or remote terminal via rack
mounting or placement on a stable flat surface. The highly integrated design allows two (2) M7s to be
built into a one 19” rack unit (1 RU) (1.75”H x 19”W x 12”D) mounting case. The M7 is an integral part
of a satellite earth station’s equipment operating between the Data Terminal Equipment and the
station RF equipment.
1.2.
Network Types
The M7 is extremely flexible in regard to the network types that can be configured. Depending on the
network type, different baseband interface options are available that will maximize the capability for
the network. The three main network types are:
