MRC DRS4000, User And Technical Manual

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Theory of Operation 6-5 DRS4000 Receiver User and Technical Manual
The Processor Module contains an integrated USB 2.0-
compliant Host controller that supports low- and full-speed data
transfers for firmware upgrade purposes only. High-speed
transfer is not supported, nor are USB On-the-Go (OTG) devices
(USB devices that do not need a PC to communicate). A USB
connector on the front panel allows for firmware upgrades via a
flash drive.
This module also contains a web server for remote management
via a PC’s web browser. The web server is accessed through the
RJ-45 Ethernet connector.
6.1.7 Interface Module
The Interface Module provides a communication interface
between the DRS4000 Processor Module and the Block
Downconverters/Outdoor Units (BDCs/ODUs) attached to the
receiver. The Interface Module also provides an interface for
external alarms mechanisms attached to the DRS.
The Interface Module accepts a composite video signal from the
MPEG Decoder and generates two copies of it. The Interface
Module also provides the following functionality:
• Provides site management and alarm functionality
• Accepts four ASI signals, switches among them, and
generates four copies of the selected signal.
The Interface Module also contains an independent, dual-
channel RS-232 transceiver.
6.1.8 Power Supply
The power supply accepts a range of AC input voltages from 105
to 260 VAC at 50 to 60 Hz. The power supply provides the DC
voltages required by the rest of the receiver’s hardware. Typical
output voltages are +24 VDC, +5 VDC, +12 VDC, and -12 VDC.
The AC receptacle is protected by a pair of 2 amp fuses.
6.1.9 Packet-Based Switch Module
The Packet-Based Module is an option that can select the best
signal from four ASI inputs (with the same content) and generate
the best possible ASI stream on two outputs. It can be used to
gang multiple receive sites together using a cellular diversity
technique at the ASI level. The ASI output stream bitrate is
adjustable up to 40 Mbps.
The Packet-Based Module can also decode the ASI stream if it is
in an SD format. The ability to decode an HD signal is not
provided. Individual channels can also be re-muxed.
Note When re-multiplexing ASI signals it is essential
that each encoded service has a unique
Program Identification (PID). The unit does not
dynamically re-allocate PID values.