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  • Publicado : 27 de agosto de 2012
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Optoelectronics

GainStar Node

Description
The GainStar Node is designed for fiber deep HFC networks. The optical receiver module in conjunction with the RF amplifier provides high-quality video and data service. The RF technology and integrated optoelectronic receiver module increase reliability and decrease nonlinear distortion.

Features
• • • • • • 1290 nm to 1600 nm wavelengthLocal test point and LED indicator on 870 MHz optical receiver module 862 MHz GainStar RF Amplifier platform uses GaAsFET technology for reduced power dissipation and improved distortion performance Dual high-level RF outputs(48 dBmV) Easy selection of split bandwidth in forward/reverse path with plug-in modules ROSA / TNCS element management system supported. With optional 3-state reverse switchthe plug-in transponder can monitor: − Optical power of transmitter and receiver − Node temperature − DC output voltage of power supply − AC input voltage, remote powering /coaxial cable powering − 3-state reverse switch status, remotely controlled via ROSA/TNCS system (switch attenuation levels are 0 dB, -6 dB or OFF, respectively) Interstage equalizer to improve overall frequency responsespecification Optional reverse optical transmitter available 60 V AC high-efficiency switch-mode power supply (10 A current bypassing capability in 3 ports, a coaxial cable inlet on the top housing) Outdoor housing is IP 68 dust-proof and water-tight

• • • •

GainStar Node
Element Management
The GainStar Node can be configured with a status monitoring transponder. When connected with ROSA/TNCS orHMS element management system, the transponder can remotely monitor many of the amplifier’s critical operating parameters and remotely control the 3-state reverse switch. The reverse switch can be used to isolate the reverse noise within the network. Once the noise source is located, the associated amplifier can be isolated until it is fixed while the remaining part in reverse path is still undernormal operation.

Block Diagram

3 STATE SWITCH OR 0bB JUMPER

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GainStar Node
Specifications
Forward Optical Receiver Module
Optical Split Receiving Wavelength Optical Input Power Connector Optical Return Loss Forward RF Bandwidth Frequency Response Internal Tilt(±1dB) Tilt Range Output Level(two-way) Forward Gain(min) Gain Range Return Loss Distortion CTB CSO Reverse RF OperatingBandwidth Reverse Gain Frequency Response Return Loss Link Frequency Response CNR (Note 2) CSO (Note 2) CTB Mechanical Water/Dust Ingress Rating Dimensions Weight Environmental Operating Temperature Power Supply Power Surge Element Management Element Management Supported °C °F V W kV -40 to +60 -40 to +140 ~60 (40 V to 90 V) 10 A current bypassing capability 42 6 kV,1.2 µs/50µs
(Note 2) (Note 1)Units MHz nm dBm dB MHz dB dB dB dBmV dB dB dB dBc 3730035 65/87

Specifications 3730040 40/52 1290 to 1600 -3 to +2 SC/APC >45 52 to 862 ±0.75 0 3730041 42/54

87 to 862

54 to 862

Fixed-value equalization in 1.5 dB step (optional) 48 @ 870 MHz 48 @ 870 MHz 48 @ 870 MHz 35.5 @ 87 MHz 35.5 @ 52 MHz 35.5 @ 54 MHz 30 attenuation in 1 dB step (optional) ≥16 (87 to 862 MHz) 59 PAL D/K ≥ 72≥ 72 5 to 65 18, 23 optional 64 PAL B/G ≥ 81 ≥ 70 5 to 40 17.5, 22.5 optional ≤ ± 0.75 ≥16 ±0.75 dB (typical) ±1 dB (max) 59 CH PAL D/K ≥52 ≥62 ≥67 IP 68 310 x 230 x 130 12.2 x 9.1 x 5.1 5 11.0 89 CH PAL B/G ≥50.5 ≥62 ≥67 78 NTSC ≥ 80 ≥ 70 5 to 42 17.5, 22.5 optional

MHz dB dB dB dB dB dBc dBc

mm in. kg lbs

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ROSA/TNCS

Notes: 1. Test condition: insert 12 dB EQ, optical input power is0 dBm 2. Test condition: RF input: PAL D/K 59 loaded from 47 to 550 MHz. 64607C(10 dBm) Tx input: 20 dBmV. Optical link loss: 10 km fiber+ optical attenuator. Optical received power: -1 dBm. 12 dB EQ inserted in GSN. RF output @543 MHz: 45 dBmV. HP8591 spectrum analyzer (channel filter is used when testing).

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GainStar Node
Specifications, continued
Reverse Optical Transmitter Module...
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