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Author: James Xu Publish Time: 19-11-2018 Origin: Site
When the communication signal or the TV signal is transmitted within a certain distance in the coaxial cable, for example, after 100 meters, the signal is obviously attenuated, and when the power becomes low and cannot meet the requirements, a signal amplifying device is needed. This device is called CATV LINE Amplifier or trunk Amplifier. Before we buy a trunk amplifier, we should first understand the details of this trunk amplifier and the trunk amplifier, because the range of signals amplified by different specifications is different. Next,
Product experts James Xu from zion communication king-tone electronic company, Mr. James Xu will give a detailed introduction.
This is a typical amplifier design as shown in the below.
When we check this design, we must ask why a CATV Amplifier Undergoes Stage 2 Attenuation, Equalization, and amplification? Why twice?
I explain each function as follows:
Input attenuation -> system operator adjusts input signal strength
Input Equalization -> System Operator Adjusts Input Signal Slope
Preamplifier -> Amplifier front very low noise amplification
Interstage attenuation -> Manufacturer adjusts internal signal strength
Interstage Equalization -> Manufacturer Adjusts Internal Signal Slope
Main amplification -> Amplifier rear high efficiency amplification
Why attenuation then amplify, the purpose is to adjust the amplifier to the best state.
The second amplification is to give the amplifier enough gain without distortion.
CMTS; DOCSIS3.0; ATT; EQ;FZ110;FP204;RF;GND;C/CTB;C/CSO;H.P;L.P; 5/8″inch UNEF;FUSE;
MGC;AGC;ALC;ASC;OUTPUT LEVEL;DIN45004B;
FORWARD FREQUENCY RANGE;RETURN FREQUENCY RANGE;GAIN;SLOPE;AC 35 -90 V;
CMTS:Cable modem termination system.
A cable modem termination system or CMTS is a piece of equipment, typically located in a cable company'sheadend or hubsite, which is used to provide high speed data services, such as cable Internet or Voice over Internet Protocol , to cable subscribers . A CMTS provides many of the same functions provided by the DSLAM in a DSLsystem.
DOCSIS3.0:Data Over Cable Service Interface Specification
is an international telecommunications standard that permits the addition of high-bandwidth data transfer to an existing cable TV (CATV) system. It is employed by many cable television operators to provide Internet access (seecable Internet ) over their existing hybrid fiber-coaxial (HFC) infrastructure. The version numbers are sometimes prefixed with simply "D" instead of "DOCSIS" (e.g. D3 for DOCSIS 3).
In electrical engineering and telecommunications , attenuation affects the propagation of waves and signals inelectrical circuits , in optical fibers , and in air. Electrical attenuators and optical attenuators are commonly manufactured components in this field.
A push–pull amplifier is a type of electronic circuit that uses a pair of active devices that alternately supply current to, or absorb current from, a connected load. Push–pull outputs are present in TTL and CMOS digital logic circuitsand in some types of amplifiers , and are usually realized as a complementary pair of transistors , one dissipating or sinking current from the load to ground or a negative power supply, and the other supplying or sourcing current to the load from a positive power supply.
RF:Radio Frequency
GND:
The GND on the circuit board represents Ground or 0-wire. GND means the public end, or earth, but it is not land in the true sense of the word. A ground is a ground assumed for an application and, in the case of a power supply, it is a negative pole of a power supply. It's different from the earth. Sometimes it needs to be connected to the earth, and sometimes it doesn't, depending on the situation.
C/CTB:Carrier to Composite Triple Beat ratio
C/CSO:Carrier to Composite Second Order beat ratio
H. P;L.P; high-pass filter and a low-pass filter
5/8″inch UNEF;
UNEF, a designation for Extra-Fine thread series of Standard Unified Screw Threads (ANSI B1.1)
MGC;Manually control gain and equalization
AGC;Automatic gain control
ALC;Automatic level control
ASC;Automatic slope control
FORWARD FREQUENCY RANGE;55 -- 550 MHz, 75 -- 750 MHz, 86 -- 860 MHz
RETURN FREQUENCY RANGE;5-65MHZ
GAIN;-32DB
SLOPE;
AC 35 -90 V;
Alternating current , a type of electrical current in which the current repeatedly changes direction
series are high gain high output bidirectional amplifiers. It is suitable to the 1GHz CATV bidirectional cable transmission network.
2. Features
▶ Plug-in equalizer and attenuator, GaAs power double output.
▶ Two-way independent output, cast aluminum waterproof housing.
▶ Frequency Range: 5 ~ 65/87 ~ 1003 MHz;5 ~ 65/87 ~ 862 MHz
▶ Forward Path Maximum Full Gain: ≥ 40 dB
▶ Forward Path C/CTB: ≥ 65 dB
▶ Forward Path C/CSO: ≥ 63 dB
▶ Return Path Maximum Full Gain: ≥ 20 dB
▶ Return Path Carrier Second Order Intermodulation Ratio: ≥52dB
4. General features
▶ Consumption: ≤ 35W
▶ Operating Temperature: -20 ~ +55℃
▶ Operating Voltage: AC 35 ~ 90V (50Hz)
▶ Dimension: 320mm(L)X 200mm(W)X 140mm(H)
▶ By Frequency： 5 ~ 65/87 ~ 1003 MHz;5 ~ 65/87 ~ 862 MHz
5 ~ 204/258 ~ 1218 MHz; 5 ~ 85/110 ~ 1218 MHz
According to two-way, one-way points
Divide it by indoor and outdoor
By Power Supply
DC 120 ~ 265V or AC 35 ~ 90V (50Hz)
YOUTUBE:
https://www.youtube.com/watch?v=Fizoof0oApg
https://www.youtube.com/watch?v=FiirOZWN4wg
https://www.youtube.com/watch?v=SsgIaPJ0Cl0
https://www.youtube.com/watch?v=vPB6sLfobNo
Wikipedia:
https://en.wikipedia.org/wiki/Cable_modem_termination_system
https://en.wikipedia.org/wiki/DOCSIS
https://en.wikipedia.org/wiki/Attenuation
https://en.wikipedia.org/wiki/Equalization
https://en.wikipedia.org/wiki/Push%E2%80%93pull_output
https://en.wikipedia.org/wiki/Radio_frequency
https://baike.baidu.com/item/GND/13872188
https://baike.baidu.com/item/C%2FCTB/961469
https://baike.baidu.com/item/C%2FCSO/947136
https://en.wikipedia.org/wiki/Diplexer
https://en.wikipedia.org/wiki/Unified_Thread_Standard
https://wenku.baidu.com/view/86a6501e650e52ea551898e2.html
https://core.ac.uk/download/pdf/61788465.pdf
https://en.wikipedia.org/wiki/Slope
Google:
https://en.wikipedia.org/wiki/Optical_fiber
https://www.techwalla.com/articles/how-does-a-cable-tv-amplifier-work
https://www.cablesatellitesupply.com/Amplifiers-s/1836.htm
https://www.zion-communication.com/Zion-Communication-Product-Catalog.html
https://www.youtube.com/watch?v=7SiO5i4i0e0
https://en.wikipedia.org/wiki/AC
Mulit-Mode Indoor fiber optic cable
Mulit-Mode outdoor fiber optic cable
Single-Mode Indoor fiber optic cable
Single-Mode outdoor fiber optic cable
Product List : Click https://www.zion-communication.com/FiberOpticCable.html
Optical fibre pdf : Download
https://www.zion-communication.com/Zion-Communication-Product-Catalog.html
HANGZHOU ZION COMMUNICATION CO., LTD is a professional leader China Coaxial Cable, Fire Alarm Cable, Network Cable, fiber optic cable manufacturer with high quality and reasonable price. Welcome to contact us.web: https://www.zion-communication.com
Professional cable manufacturer.
Professional cable solutions supplier.
Supplier and provider of competitive signal & Low voltage power transmission products and services.
20 Years experienced OEM & ODM supplier.
Your honest and trustworthy partner in China.
Product Director : James Xu
Email: james@zion-communication.com
Linkedin: James xu
Product List : Click
Optical fibre pdf : Download
