MRC DRS2000HS, Руководство пользователя и техническое руководство

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Theory of Operation 6-4 DRS2000HS/DRS6000HS User and Technical Manual
• High performance digital input filter
• Digital automatic frequency correction allowing ± 350 KHz
offset recovery.
Each COFDM demodulator, once locked on to an incoming
signal, can provide important signal performance measurements
such as:
• Received Carrier Level (RCL)
• Link Quality (LQ)
• Signal to Noise Ratio (SNR).
You can view these measurements in real-time via the receiver’s
Control menu.
6.1.3 MPEG Decoder Module
The MPEG decoder module supports SD video. It has two
composite video output ports.
The decoder module accepts a digital ASI signal from the
COFDM diversity demodulator and recovers the compressed
video (either NTSC or PAL) and/or audio signals.
Additional features provided by the MPEG decoder module
include a serial wayside data channel, AES, and BISS
decryption capabilities.
6.1.4 Processor Module
The Processor Module is an embedded computer that manages
OAM&P (Operations, Administration, Maintenance, and
Provisioning) functionality within the DRS2000HS/DRS6000HS.
The Processor Module receives user input via a keypad on the
front panel of the receiver and through a network interface.
Software running on the Processor Module’s microprocessor
interprets user commands and relays them to the receiver’s
internal subsystems. Replies to user commands and system
status are output via an LCD screen on the front panel of the
receiver and through a network interface. Connections to other
DRS4000 internal subsystems are made by serial
communications channels.
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.
6.1.5 Interface Module
The Interface Module 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 contains an independent, dual-channel RS-232
transceiver.
6.1.6 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.