HDO775 Transmitter

HDO775 Transmitter HDO775 | C-band DWDM transmitter | 47...1218 MHz

HDO775 downstream transmitter supports frequencies up to 1218 MHz and has one adjustable 10 dBm output. HDO775 is a directly modulated 1550 nm DWDM transmitter for short, medium and long distances. It supports broadband, narrowcast and broadcast services in digital and analog formats.

Product information

Overview

HDO775 features

DOCSIS 3.1 compatible 1.2 GHz bandwidth
ITU wavelengths in 100 GHz grid
Optical output power adjustment for channel power equalising
Electrical dispersion compensator provides a good CSO performance at longer transmission distances
Standardised input and test point levels
Low power consumption and high performance
Two identical inputs with individual level and slope adjustments
High isolation between inputs
Unused input can be switched off for power saving and noise reduction
Drive amplifier can be set to power save mode in narrowcast load conditions
Integrated input amplifiers and laser driver amplifiers
Automatic power control providing constant total OMI as standard feature
Optional integrated xWDM filter to combine forward and return paths into one fibre or to combine various forward wavelengths into one fibre
Optional spectrum analyser function enabling ALSC
Fibre connectors can be located at the rear or at the front panel
Small form factor family, 2 RU height
Local and remote software control of all adjustments
Forced cooling through the unit

Management features

Monitoring of APC (Automatic Power Control) functionality with user configurable offset
Optical output power adjustment and monitoring
Laser bias current monitoring
TEC (Thermo-Electric Cooler) current monitoring
Laser temperature monitoring
Signal level adjustment in both inputs
Slope adjustment in both inputs
Input 2 switch on/off
Drive amplifier power save mode on/off
Link length setting
LED indicators for signal and module statuses
Internal temperature measurement and monitoring
Intelligent fan speed control with monitoring
Non-volatile logging of events, including alarms, alarming values, settings changes and application starts
Uptime and total uptime counters
All adjustments and alarm limits fully user configurable
Local PC connection through backplane HDO bus with HDX021 cable
Remote IP connection through HDC100 controller module
SNMP monitoring and configuration through HDC100 controller module

Benefits

Future-proof with DOCSIS 3.1 compatibility

HDO775 has an extended frequency range to fulfil DOCSIS 3.1 requirements.

High performance

HDO775 transmitter contains an electrical dispersion compensator that is important especially when the transmission distance is longer.

Cost-effectivity with low power consumption

To increase cost-effectivity, HDO775 offers high performance and the widest variety of features combined to low power consumption.

Specifications

Optical parameters
Parameter	Specification
Light source	Cooled DFB with optical isolator
Peak wavelength	1530...1560 nm (ITU ch59...21)
Output power, nominal value	+10 dBm
SBS suppression	+16 dBm
Relative	-154 dBc/Hz
OMI per channel	2.6 %
Link length setting	0...40 km
Pass band of optional xWDM filter Pass channel Reflect channel, DWDM Reflect channel, CWDM	±0.12 nm (DWDM) or ±6.5 nm (CWDM) 1520...1565 nm except the pass channel 1260...1620 nm except the pass channel
Number of optical ports	1 or 2

RF parameters
Parameter	Specification
Frequency range	47...1218 MHz
RF impedance	75 Ω
Input return loss	18 dB
Flatness	±0.4 dB
Automatic power control (APC)	Yes
Laser test point for 4.5% OMI	78 dBµV
Input level	77 dBµV
Level adjustment range	-15...0 dB
Equaliser adjustment range	-6...+1 dB
Isolation between inputs	50 dB

Spectrum analyser module (option)
Parameter	Specification
Measurement range	47...1218 MHz, 0.25 Hz steps
Measurement bandwidth	0.35 MHz
Dynamic range	58...98 dBµV
Measurement accuracy	±1 dB

Noise and distortion performance
Parameter	Specification
MER	40 dB
BER	<-10^9

General
Parameter	Specification
Power consumption	8.2 W
Supply voltages	25 V / 250 mA 6.3 V / 300 mA
RF connectors	F female
Optical connector	SC/APC, E-2000
Cooling	Field replaceable fan
Dimensions (H x Wx D)	2U x 7HP x 380 mm Occupies 1/12 of HDX installation frame
Weight	1.5 kg
EMC compliance	EN 50083-2
Enclosure classification	IP20
Operating temperature range	0...+45 °C
Storage temperature range	-20...+60 °C
Operating relative humidity	0...85%

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HDO775 Transmitter

Product information

HDO775 features

Future-proof with DOCSIS 3.1 compatibility

High performance

Cost-effectivity with low power consumption

FttH solutions

HFC access networks

A quantum leap to increase transmission capacity

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HDO775 Transmitter

Product information

HDO775 features

Future-proof with DOCSIS 3.1 compatibility

High performance

Cost-effectivity with low power consumption

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