DDM-800

Multi-Channel 8VSB Frequency-Agile Demodulator

The DDM-800 is a compact, frequency-agile digital demodulator capable of demodulating 8VSB, 64 QAM and 256 QAM modulated signals, and converting them to DVBASI output format. It can also house up to four separate receivers in one package. The demodulated MPEG-2 output streams can then be locally decoded, analyzed, multiplexed or passed to a cable facility via QAM modulators or to a data distribution network.

The DDM-800 front panel interface enables quick setup through direct entry key-pad and navigation keys. The front panel indicates the current channel number or the center frequency.

The status display for each demodulator shows signal-to-noise ratio (SNR), bit error rate (BER), and fine tuning offset. External communications support configuration through an intuitive web browser GUI via the 10/100Base-T Ethernet connection. The resident SNMP agent enables straightforward integration into headend, station or uplink network control, and monitoring systems with real-time clock for time stamp on alarms.

The 1RU DDM-800 has the flexibility to add three optional demodulators (DDM-Opt-801) to its base unit, providing a space efficient and economical solution for cable, satellite and broadcast facilities.

Features

High Demodulator Density:
- Four Receivers in compact 1RU package
- Supports 8VSB and QAM modulated transmissions
No space required between units when rack mounting
Factory or field installed modules (single demodulator is standard)
Most advanced 8VSB demodulation technology available
Tunes 54 to 860 MHz
- Channels: 2 to 69 (off Air)
- Channels: 2 to 134 (cable)
Ethernet communications, Web browser, and SNMP support with alarm time stamp
Real-time clock with battery backup, instant memory save feature for all settings
Front panel controls with direct entry keypad
Front panel LCD display with backlight
Power and summary alarm LED indicators
Universal, multi-drop serial port
Programmable GPI alarm outputs
Standards available: ATSC, 64 QAM, 256 QAM

Ability to add additional 8VSB demodulators to 1RU base unit, DDM-Opt-801

Specifications

Specifications and designs are subject to change without notice.

Tuner
Tuning Range	Frequencies from 55 to 860 MHz (VHF channel 2 to 13, UHF channel 14 to 69) (Cable channel 2 to 134)
Input Range	-24 dBmV to 29 dBmV (8VSB) 0 to 15 dBmV (QAM)
Fine Tuning Range	±2 MHz in 64 steps (62.5 kHz increments)
Connector	F-type, female, 75 ohms

ASI Output
Data Rate	270 Mb/s
Voltage Level	800 mV pk-pk ±10%
D.C. Offset	±0.5 VDC
Rise Time	<1.2 ns (20% to 80%)
Connector	BNC, 75 ohms female

Remote Control
Communications	Ethernet
Supported Rates	10/100Base-T
Connector	RJ45, female
Indicators	Network activity, link
Communications	RS-232/422/485 selectable
Supported Baud Rates	9600, 19200, 38400, 57600, 115200
Connector	9-pin D-sub, female

GPI	4 fully programmable GPOs notification of loss of power Data link integrity High temperature alarm Carrier unlock, by demod BER alarm, by demod SNR alarm, by demod
Relay contact closure	0.35 A @ 30 VDC
Absolute maximum current	1 A

Power Requirements
Input	90 to 264 VAC, 50/60 Hz
Consumption	45 VA, maximum

Environmental
Operating Temperature	0° to 50°C
Storage Temperature	-40° to 65°C
Humidity	90% maximum (non-condensing)

Mechanical
Dimensions (H x W x D)	1.75 x 19 x 19.5 in. (4.5 x 48.3 x 49.6 cm)
Weight	7.54 lb (3.42 kg)

Standard Accessories	Operation and service manual SNMP support CD Power cord Rackmount kit

Ordering Information

DDM-800	Multi-channel, 8VSB, frequency-agile, ATSC demodulator; front panel interface with channel, signal-to-noise and bit error rate readout; remote control by RS-232/422/485, Ethernet, SNMP and web browser; 1RU; accepts up to three demodulator module options (DDM-OPT 801)

DDM-OPT 801	8VSB demodulator module option for the DDM-800 used in ATSC digital transmission; up to 3 additional modules per DDM-800; RF input to DVB-ASI transport stream output

Not for sale in the European Union

Sales Contacts

North America +1 800 231 9673
Caribbean and Latin America +1 786 437 1960

Europe and Africa +44 118 964 8200
Middle East and South Asia +971 4 433 8250

Asia, Pacific Rim +852 2776 0628