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Subscriber Networks
Model D9479 Gigabit QAM Modulator
Description
The Model D9479 Gigabit QAM Modulator (GQAM)
represents an innovation in video transmission
technology. The GQAM contains five input ports
including four digital video broadcasting (DVB)
standard asynchronous serial interface (ASI) inputs
and a Gigabit Ethernet (GbE) port.
The GQAM contains the core functionality of four of our Model D9477 MQAM Modulators.
One GQAM frees up a total of seven additional rack unit (RU) openings, thereby making
the GQAM an exceptional product for mass deployment of video-on-demand (VOD),
anything-On-Demand (xOD), and other interactive broadcast services.
The four ASI inputs allow for direct connection to current generation video servers,
encoders, integrated receiver-decoders (IRDs), and other digital video sources at the
headend. The GbE interface allows for connection to the next generation of video
servers, either linked locally with the GQAM or remotely through a network.
Features
• Contains the core functionality of the MQAM modulator
• Includes 5 input ports and can provide up to 16 QAM outputs to achieve the
broadcast capacity of 4 MQAM modulators or 16 QAM modulators
• Enables direct connect to both DVB ASI and Gigabit Ethernet video sources at the
same time and the capacity to create transport streams from any combination of the
5 inputs
• Provides 4 DVB ASI inputs (216 Mbps each) and 1 plug-in Gigabit Ethernet input
(GBIC) to multiplex content from any input to any of the 16 outputs (channels)
• Uses an output center frequency range of 91 MHz to 867 MHz
®
• Incorporates PowerKEY
• Enables higher rack density to save space
• Optimizes system management with provisioning and monitoring by the DNCS
• Facilitates deployment in either a headend or a hub
DES and DVB Common Scrambling Algorithm options
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Model D9479 Gigabit QAM Modulator
Back Panel Connectors
Specifications
Digital I/O Performance
Maximum Input Rate 1.804 Gbps (4 x 216 Mbps [ASI payload rate] plus 952 Mb/s
[GbE payload rate])
Maximum Aggregate Output Rate 620 Mb/s (16 x 38.8 Mb/s)
RF
Block Conversion Up to four 6 MHz QAM channels within a 24 MHz bandwidth per QAM
output
Frequency Range (center
frequency)
Minimum Tuning Step Size The 24 MHz block of frequencies can be tuned in increments of 250 KHz
RF Output Power Level (per QAM
carrier)
RF Output Power Tolerance
Note: Actual output power is within
±2 dB of the value displayed for
setpoint, temperature, and
frequency variations. Power output
adjustment range is from 42 dBmV
to 56 dBmV.
RF Output Impedance 75 ohm
RF Output Return Loss
(unsquelched)
Spurious Outputs (50 MHz to
1.1 GHz)
Noise Floor (out of band) < -136 dBc/Hz, > 40 MHz from center frequency
91 MHz to 867 MHz
+44 dBmV to +54 dBmV (0.1 dB steps) minimum range
Note: Noise and spurious performance limits apply with the output power
in the range of 44 dBmV to 54 dBmV.
± 2 dB
> 12 dB (within output channel)
< -60 dB (relative to the average power of the QAM channel with the
highest power level)
Mechanical
Rack Mount Type EIA RS-310
Dimensions 1.75 in. x 19 in. x 22.5 in., HWD
Weight 13.5 lb (5.4 kg)
(44.45 mm x 482.6 mm x 571.5 mm, HWD)
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Model D9479 Gigabit QAM Modulator
Specifications, continued
Environmental
Operating Temperature Range
Storage Temperature Range
Operating Humidity 5% to 95%, non-condensing
Electrical
Input Voltage AC unit: 90 VAC to 130 VAC @ 47 Hz to 63 Hz, or 180 VAC to 264 VAC
Power Required (AC unit) 155 VA (typical)
Power Dissipated 151 Watts (typical)
In Rush Current 35 amps maximum, Vin = 130 VAC (AC unit)
0°C (32°F) to 50°C (122°F)
-10°C (14°F) to 70°C (158°F)
@ 47 Hz to 63 Hz
DC unit: -42 VDC to -57 VDC
75 amps maximum, Vin = 264 VAC (AC unit)
15 amps maximum, Vin = -57 VDC (DC unit)
Connectors
RF Outputs 4 total, type F, 75 ohm
ASI Inputs 4 total, BNC, 75 ohm
Gigabit Ethernet GBIC module connector. Modules are available for single-mode fiber,
multi-mode fiber, and copper interfaces
Ethernet 10/100BaseT RJ-45
Craft Port DB-9 male
AC Power IEC 320
DC Power 2-pin removable terminal block
Modulation
6 MHz Spec Type Alpha Interleaver Symbol Rate
(Msymbols/sec)
Data Rate
(megabits/sec)
Bandwidth
ITU-A DAVIC/DVB 64 12% I=12, J=17 5.304 29.328 Mb/s 6 MHz
ITU-A DAVIC 256 12% I=204. J=1 5.304 39.104 Mb/s 6 MHz
ITU-B QAM 64 18% I=128, J=1 5.056941 26.971 Mb/s 6 MHz
ITU-B QAM 256 12% I=128. J=1 5.360537 38.811 Mb/s 6 MHz
ITU-C DAVIC/DVB 64 13% I=12, J=17 5.274 29.162 Mb/s 6 MHz
Regulatory Compliance
UL, CUL, and FCC Listed/Compliant
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Model D9479 Gigabit QAM Modulator
Ordering Information
Contact your Sales Representative for product availability in your area.
Gigabit QAM Modulator Chassis Part Number
Gigabit QAM Modulator Model D9479-1 (110 VAC unit) 740450
Gigabit QAM Modulator Model D9479-2 (48 VDC unit) 4000148
Gigabit Ethernet Interface Options (select one) Part Number
Multi-mode fiber (MMF) GBIC, 850 nm wavelength, SC-SC connector type 1000839
Single-mode fiber (SMF) GBIC, 1300 nm wavelength, SC-SC connector type 1000127
Copper GBIC, 1000BaseT, RJ-45 connector type 4009446
Scientific Atlanta and PowerKEY are registered trademarks of Scientific-Atlanta, Inc.
Cisco, Cisco Systems, and the Cisco Systems logo are registered trademarks of Cisco Systems, Inc. and/or its affiliates
in the U.S. and certain other countries.
All other trademarks shown are trademarks of their respective owners.
Specifications and product availability are subject to change without notice.
© 2006 Scientific-Atlanta, Inc. All rights reserved.
Scientific-Atlanta, Inc.
1-800-722-2009 or 770-236-6900 Part Number 4005270 Rev C
www.scientificatlanta.com August 2006
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