ASM 988A – Manual
1
UNIT DESCRIPTION
The ASM 988A is a satellite modulator. This unit uses an advanced coding in the FEC
layer to operate near Shannon’s theoretical limit of bandwidth efficiency. This unit
accepts a M2P, DVB-SPI, DVB-ASI input transport stream and produces up to a 30
Mbaud modulated signal agile about 70 MHz.
FEATURES
User Interface and Remote Control
• Front Panel access (Vacuum-Fluorescent Display and Keypad) to modes, parameters
and status information.
• RS232, and 10BaseT Ethernet connections for configuration, monitoring and control.
• Relay contact outputs for fault monitoring and automated redundancy switch control.
Configurable Parameters
• 8PSK FEC Rates: 2/3, 3/4 (2.05), 3/4 (2.1), 5/6, 8/9
• TURBO QPSK FEC Rates: 1/4, 1/2, 3/4
• 16 QAM FEC Rates: 3/4
• DVB-QPSK FEC Rates: 1/2, 2/3, 3/4, 5/6, 7/8
• DSS-QPSK FEC Rates: 1/2, 2/3, 6/7
• Output Power Attenuation: -5 to –20 dBm
• Input Mode: M2P w/ internal clock, M2P w/ external clock, DVB-SPI, DVB-ASI
w/int clock, DVB-ASI w/ext clock
• Test Modes: PN-23, Inverted PN-23, Inverted PN-23 w/o Sync Byte
• Input Levels: RS422, LVDS
• Input Rate: 0.52 to 85 Mbps (Depending of the modulation modes)
• Modulation Modes 8PSK, 16-QAM, Advanced QPSK, QPSK-DVB, DSS QPSK
• Symbol Rate: 0.256 to 30 MSps, depending on the modulation modes
• Excess Bandwidth (alpha): 0.10 – 0.50 with 0.01 resolution
• Spectral Inversion: on/off
• Output Mute: on/off
Monitored Parameters
• Input Activity
• Supply Voltages
• Temperature
• Fan Operation
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General