ASM 988A Advanced Satellite Modulator


Overview

With the ongoing need to increase bitrate efficiency, operators are looking for better modulators that will provide more bits per Hz. The ASM 988A provides higher bitrate by offering efficient 8PSK modulation as well as QAM 16 and QPSK. The ASM 988A is perfect for the DBS environment, contribution, or SNG.

Features

  • Provides 8PSK modulation in the same SNR environment as QPSK
  • Supports legacy QPSK mode
  • Supports 16QAM, Advanced QPSK
  • Supports M2P, DVB-SPI, DVB-ASI Input with 1 to 85 Mbits/s Transport stream input
  • Supports DSS QPSK
  • Supports DVB satellite format input
  • Monitored parameters for error reporting and detection
  • 10 Mhz reference clock input
  • -20 dB Front panel test output
  • Alarm generation with relay output for redundancy switching
  • Remote control through Ethernet Supports SNMP protocol
  • Agile 70 MHz IF output
  • Packet stuffing and PCR recalculation for input data rate adjustment on ASI input

Specifications

8PSK Modulation Parameters
FEC RateFEC 2/3FEC 3/4-IFEC 3/4-IIFEC 5/6FEC 8/9
Bit Rate in Mbits/s
0.52 to 57.10.55 to 62.80.5 to 61.20.59 to 68.50.61 to 71.4
Baud Rate in Mbauds
0.256 to 300.256 to 300.256 to 300.256 to 300.256 to 30
 
Note: FEC 3/4-I represents 2.1/symbols and FEC 3/4-II represents 2.05 bits/symbols
• Excess Bandwidth (alpha): 0.1 to 0.5 with 0.01 Resolution
• Symbol Rate Step 1bps
• Spectral Inversion: on / off 

QPSK Modulation Parameters
FEC Code Rates:1/2, 2/3, 3/4, 5/6, 7/8
FEC Modes:As per ETSI EN 300 421 V1.1.2 DVB
Symbol Rate:256 KSps to 30 MSps
Excess Bandwidth (alpha):0.1 to 0.5 with 0.01 Resolution
Spectral Inversion:on / off
  
Advanced QPSK Modulation Parameters
FEC Code Rates:1/4, 1/2, 3/4
FEC Modes:Turbo Code
Symbol Rate:256KSps to 30 MSps
Excess Bandwidth (alpha):0.1 to 0.5 with 0.01 Resolution
  
Note: FEC 3/4-I represents 2.1 bits/symbols and FEC 3/4-II represents 2.05 bits/symbols
 
16 QAM Modulation Parameters
FEC Rate:3/4
FEC Mode:Turbo Code
Symbol Rate:256KSps to 30 MSps
Excess Bandwidth (alpha):0.1 to 0.5 with 0.01 Resolution
  
DSS QPSK Modulation Parameters
FEC Rate:1/2, 2/3, 6/7 FEC Mode
Symbol Rate:256KSps to 30 MSps
Excess Bandwidth (alpha):0.1 to 0.5 with 0.01 Resolution
  
70Mhz I.F. Output Specifications
Frequency:70MHz, Agile within +20 to -20MHz, 1Hz steps
Power:5 to -20 dBm, 0.5dB steps
Note: The Power output will be affected with temperature variations up to 2 dBm
Power Accuracy: 1dB (CW mode and spectral output mode)
In Band Spurious:50dBc
Out of Band Spurious:50dBc
Phase Noise:@ 100Hz, -71dBc
 @ 1 kHz, -81dBc
 @ 10 kHz, -91dBc
 @ 100 kHz, -101dBc
 @ 1 MHz, -111dBc
Impedance:75 ohms
  
Monitored Parameters
• Fault History
• Input Sync Presence
• Output Signal Presence
• Faults: Temperature, supply voltages, and fans 
 
Transport Stream Inputs
• All TS inputs up to 85 Mbits/s
• M2P input, DB25
• DVB-SPI input, DB25 with loop through
•MPEG Bit/Byte clock output for modulator master mode operation
• Packet Stuffing and recalculation of PCR for input data rate adjustment >0% and
< 40%   of packets stuffing
• DVB-ASI sync mode for automatic data rate adjustment
 
External Clock Input
• 10MHz input TTL on BNC connector
• If external clock is present, unit automatically synchronizes to incoming 10MHz
• If clock is absent, unit uses internal reference 
 
General Specifications
• Line Power: 100-240 Vac, 50-60 Hz
• 2 lines x 18 Characters Vacuum Fluorescent Display
• Dimensions: 19"W x 21" D x 1.75" H (1U rack mount chassis)
• Operating Temperature Specs: 0-50°C
• RS232, and 10BaseT Ethernet connections for configuration, monitoring, and control
• Relay contact outputs for fault monitoring and automated redundancy witch control
• SNMP protocol supported 

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