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Telecommunications

Telecommunications refer to the transmission of information over distances for the purpose of communication. In the modern age of electronics and electricity, telecommunication includes the use of electrical devices, radio and microwave communications, fiber optics, orbiting satellites and the Internet.

2,044 Questions

When and where was the enigma code invented?

The Germans used the Enigma in WW2. It had a set of gears that when you pressed a letter on the keyboard, it seemed to randomly type another letter on the sheet of paper you were typing on. only if you had the same set of gears could you translate the code to English. The gears were interchangeable so you could create many different codes.

Can you use cable modem for ADSL connection?

No, a cable modem cannot be used for an ADSL connection. Cable modems are designed to work with cable internet services, which use coaxial cables, while ADSL (Asymmetric Digital Subscriber Line) requires a DSL modem that connects via telephone lines. Each type of modem is specifically engineered for its respective technology, making them incompatible with each other.

What is the IP telephone system?

The IP telephone service also know as the Internet telephony or Voip, Voice Over Internet telephony, is a way of making calls over the internet. These calls are usually free and can save you money on long distant phone calls. There is a also a option to have video calls so you are able to see the person that you are talking to.

Italian inventer of a wireless telegraph system in 1895?

The man who invented the wireless telegraph in 1895 was Italian, Guglielmo Marconi. Stop cheating on your homework ;)

What are the abbreviations regarding telecommunication sector?


ACCPR: Adjacent Channel Coupled Power Ratio
ACIPR: Adjacent Channel Interference Power Ratio
ADC: American Digital Carrier (D-AMPS)
ADC: Analog-Digital Converter
ADPCM: Adaptive Differential Pulse Code Modulation
AFR: Active Feedback Resonator
AGC: Automatic Gain Control
AM: Amplitude Modulation
AMPS: Advanced Mobile Phone System
ANSI: American National Standards Institute
APPL: Analog PLL
ASK: Amplitude Shift Keying

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BCDMA: Broad Band CDMA
BER: Bit Error Rate
BETRS: Basic Exchange Telecommunication Radio Service
BPF: Bandpass Filter
BPSK: Binary Phase Shift Keying

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CADN: Cellular Access Digital Network
CAI: Common Air Interface
CDMA: Code Division Multiple Access
CDPD: Cellular Digital Packet Data
CELP: Code Book Excited Linear Predictive Coding
C/I: Carrier to co-channel Interference
CPE: Customer Premises Equipment
CPFSK: Continuous Phase Frequency Shift Keying
CQM: Channel Quality Measurement
CRC: Cyclical Redundancy Check
CT: Cordless Telephone
CTIA: Cellular Telecommunication Industry Association
CVSM: Continuously Variable Slope Delta Modulation
CW: Continuous Wave

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DAC: Digital-Analog Converter
DAMPS: Digital AMPS
dB: Decibel
dBc: Decibel below carrier (measurement of phase noise)
dBm: Decibel (relative to 1 mW)
DBM: Double Balanced Mixer
DBS: Direct Broadcast Satellite
dBW: Decibel (relative to 1 Watt)
DCS: Digital Cellular System
DECT: Digital European Cordless Telephone
DFT: Discrete Fourier Transform
DPLL: Digital PLL
DPSK: Differential Phase Shift Keying
DQPSK: Differentially Encoded Quadrature Phase Shift Keying
DR: Dynamic Range
DS Direct Sequence
DSP: Digital Signal Processor
DTMF: Dual Tone Multi Frequency

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EMC: Electromagnetic Compatibility
EMF: Electromagnetic Field
EMI: Electromagnetic Interference
EMR: Electromagnetic Radiation
E-TACS: Extended Total Access Communication System
ETDMA: Enhanced TDMA (with DSI- Digital Speech Interpolation)
ETSI: European Telecommunication Standard Institute

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FCC: Federal Communications Commission
FDD: Frequency Division Duplex
FDM: Frequency Division Multiplex
FDMA: Frequency Division Multiple Access
FFSK: Fast Frequency Shift Keying
FFT: Fast Fourier Transform
FH Frequency Hopping
FIR: Finite Impulse Response (filter)
FM: Frequency Modulation
FPLMTS: Future Public Land Mobile Telephone Service
FSK: Frequency Shift Keying

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GaAs: Gallium Arsenide
GBBC: GSM Baseband Codec
GFSK: Gaussian Frequency Shift Keying
GMSK: Gaussian-filtered Minimum Shift Keying
GOLD: GSM One-Chip Logic Device
GPS: Global Positioning System
GSM: Global System for Mobile Communications

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HBT: Heterojunction Bipolar Transistor
HEMT: High Electron Mobility Transistor
HPF: High Pass Filter

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IF: Intermediate Frequency
IFF: Interfrequency Filter
IIR: Infinite Impulse Response (filter)
IM: Intermodulation
IMD: Intermodulation Distortion
IMR: Intermodulation Distortion Ratio
IP: Intercept Point
ISM: Industrial Scientific Medical (frequency band)
ISO: International Organization for Standardization
ITU: International Telecommunications Union

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JDC: Japanese Digital Carrier

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LAN: Local Area Network
LEO: Low Earth Orbiting Satellite
LF: Loop Filter
LNA: Low Noise Amplifier
LO: Local Oscillator
LPC: Linear Predictive Coding
LPF: Low Pass Filter
LPLL: Linear PLL

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MAC: Medium Access Control
MAHO: Mobile Assisted Handoff
MAN: Metropolitan Area Network
MBS: Mobile Broadband System
MDSB: Mobile Data Base Station
MESFET: Metal Schottky FET
MFSK: Multi Frequency Shift Keying
MMIC: Monolithic Microwave IC
MMU: Memory Management Unit
MODEM: Modulator/Demodulator
MOS: Metal Oxide Semiconductor
MOSFET: Metal Oxide Semiconductor FET
MS: Mobile Station
MSA: Metropolitan Service Area
MSK: Minimum Shift Keying
MTSO: Mobile Telephone Switching Office

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NAMPS: Narrow Band AMPS
NCDMA: Narrow Band CDMA
NMS: Network Management System
NMT: Nordic Mobile Telecommunication System (cellular communication system in Scandinavia)
NPR: Noise Power Ratio
NTM: Network Traffic Management

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OSI: open system interconnection.

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PAM: Pulse Amplitude Modulation
PBX: Private Branch Exchange
PCM: Pulse Code Modulation
PCMCIA: PC Memory Card International Association
PCN: Personal Communications Network
PCS: Personal Communication Services
PD: Phase Detector
PDM: Pulse Duration Modulation
PDU: Protocol Data Unit
PHP: Personal Handy Phone (Japan)
PHS: Personal Handy Phone System (Japan)
PIN: Positive Intrinsic Negative (diode)
PLL: Phase-Locked Loop
PLMN: Public Land Mobile Network
PM: Pulse Modulation
POTS: Plain Old Telephone Service
PSD: Power Spectral Density
PSK: Phase Shift Keying
PUREG: Power Up Registration
PWM: Pulse Width Modulation

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Q: Quality Factor (e.g. filter)
QAM: Quadrature Amplitude Modulation
QPSK: Quadrature Phase Shift Keying

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RELP: Residual-Excited Linear Predictive Coding
RF: Radio Frequency
RFI: Radio Frequency Interference
RFIC: Radio Frequency IC
RITL: Radio-in-the-Loop
RPE-LTP: Regular Pulse Excitation-Long Term Prediction (GSM speech encoding method)
RSA: Rural Service Area
RSSI: Radio Signal Strength Indicator

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SAW: Surface Acoustic Wave (filter)
S/H: Sample and Hold
SIEGET Siemens Grounded Emitter Transistor
SINAD: Ratio of Signal plus Noise plus Distortion to Noise plus Distortion
SIM: Subscriber Identity Module
SMS: Short Message Service
S/N: Signal to Noise
SNR: Signal-to-Noise Ratio
SPLL: Software PLL
SS: Spread Spectrum
SSB: Single Sideband
SWR: Standing Wave Ratio

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TACS: Total Access Communication System (analog cellular communication in UK)
TCXO Temperature-Compensated Crystal Oscillator
TDD: Time Division Duplex
TDM: Time Division Multiplexing
TDMA: Time Division Multiple Access
THD: Total Harmonic Distortion
TIA: Telecommunication Industry Association

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UMTS: Universal Mobile Telecommunication Service
UHF: Ultra High Frequency

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VCO: Voltage-Controlled Oscillator
VCVS: Voltage-Controlled Voltage Source (filter)
VCXO: Voltage-Controlled Crystal Oscillator
VHDL: Very High Speed Integrated Circuit Hardware Descriptive Language
VHF: Very High Frequency
VQ: Vector Quantization
VSAT: Very Small Aperture Terminal
VSELP: Vector Sum Excited Linear Predictive Coding (IS-54 speech encoding)
VSWR: Voltage Standing Wave Ratio

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WAN: Wide Area Network
WARC: World Administrative Radio Conference
WCPE Wireless Customer Premises Equipment
WLAN: Wireless LAN
WLL Wireless Local Loop

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XMTR: Transmitter
XTALK: Crosstalk

List of Morse code alphabet?

Morse code alphabet (in international Morse code) is:

A: .-

B: -...

C: -.-.

D: -..

E: .

F: ..-.

G: --.

H: ....

I: ..

J: .---

K: -.-

L: .-..

M: --

N: -.

O: ---

P: .--.

Q: --.-

R: .-.

S: ...

T: -

U: ..-

V: ...-

W: .--

X: -..-

Y: -.--

Z: --..

When was the telegraph invented?

There were several steps towards the invention of the telegraph.

  • The non-electric telegraph was invented in 1794 by Claude Chappe. This system used semaphore, rather than electrical signals along a wire, as later telegraphs did.
  • A simple form of electric telegraph using liquid and the concept of electrolysis was invented in 1809 by Samuel Soemmering of Bavaria. This was not a commercially viable product, but it showed how electrical signals could be transmitted.
  • In 1825 William Sturgeon invented the electromagnet, which would later play a big part in the transmission of signals via telegraphs.
  • In 1830, Joseph Henry used Sturgeon's concept of the electromagnet to send communication signals along a wire.
  • The electric telegraph itself, which came to be the mainstay of 19th century communications, was investigated and improved upon from around 1835 by Samuel F B Morse. In 1843, the first experimental telegraph line from Washington to Baltimore was constructed, using Morse's concepts.
  • In 1893, the wireless telegraph was invented by Guglielmo Marconi.

What does the Telecommunication companies do?

Telecommunications is a mammoth industry, comprising companies that make hardware, produce software, and provide services.

Can you use any DSL modem with any broadband service?

DSL refers to a type of connection and broadband refers to an internet service. You can purchase a modem and a router independently, however many internet service providers prefer to provide you with one.

Why does your isp need to know the mac address of your cable modem or dsl modem?

The MAC address (Media Access Control) is used to identify a specific piece of network hardware, such as a network interface card (NIC), a router or a modem. Since your ISP will only wish to allow Internet access to paying customers, it can check the MAC address of your router against its list to see if it belongs to a valid customer. If you change your equipment, typically, your ISP will provide you with a process to register the new hardware's MAC address with them.

What are the examples of telecommunication devices?

the examples of telecommunication devices are ontuila chedidikong kuila butchiki hik hik hik,mumuchichang pididikong kongnang butchiki.

Copy att blackberry phone book to sim card?

hi there..... the only way to do that is savin you phone book to sim card number by number... that's how the blackberry system is setup

so all you have to do is go to your phone book..and on every name click on the menu

and then view.. then menu again and copy to sim phone book

click the wheel and save ...

hope that helpet

Neche

How do you transfer ATT info to new sprint phone?

there are a lot of factors to consider

1.) what information do you need transferred?

a.)contacts?

b.) Pictuers?

c.) Text messages?

2.) which phone are you transferring to/from

a.) too many to mention.

3.) does either device have syncing software for your desktop/laptop/netbook?

for the most part you should be able to get your address book transferred from you AT&T powered phone to your Sprint powered phone by simply visiting a corporate Sprint phone. Address book entries are easy to transfer using a cellbrite machine which most communication stores have.

How does ATT's service compare with other DSL service providers?

AT&T is a leader in providing DSL service. AT&T is as good if not better than any other provider.

can att match t-mobile unlimited everything when u buy cell phone out right 50.00

with 2 yr contract

when and where ans.

What are two disadvantages of using a satellite connection instead of DSL?

There used to be the disadvantage of requiring phone service to a phone line before acquiring DSL services, however that is no longer a prerequisite for most carriers. The current challenge for DSL is the last mile of service which requires a close proximity to the carrier premises for signaling to be proficient enough for high speed Internet access. Typically, the further from the fiber optic network, the weaker the signals. Most last mile connections run over copper wire and can be too far from that fiber optic line for decent connectivity.

How much does unlimited text messaging cost for ATT?

depending on what network your on if your on a contract it should tell you on your contract deal, but if your on pay as you go if on orange and the dolphin package you can get 100 texts and 300 mega pix of internet for £10 a month

How long Morse code take to travel from one point to another?

From one telegraph station to another - instantly. However telegraph stations were not very far apart so the message had to be retransmitted onwards. Originally this was done manually - an operator had to listen for incoming messages, write them down and then re-key tem. Later on they used punched tape which was produced when a message was received and could be automatically retransmitted. End to end - from the sender to the recipient could take several hours or days if overseas depending on the number of "hops".

What is Morse code by mirror called?

If there is a light source reflecting your mirror at a certain angle it is possible to send a Morse code to another person from a distance.

How is dsl connectivity difference dial up?

Dial up uses audio frequency tones to deliver data. 0 to 4000 Hertz

DSL uses higher frequencies in to deliver more data. 25,000 - 1,000,000's Hertz.

A low pass filter separates Audio frequency from the digital information.

DSL contains many subsets includes ADSL1, ADSL2, ADSL2+, VDSL and VDSL2.

DSL speed is also dependant on distance from the phone exchange and quality of the copper lines + connections to the premises.

DSL speed is also much lower when the cables are under water.

What is positive email?

E-mail can be described as positive if it conveys a positive, or friendly emotion, or serves a useful purpose (or both). Unfriendly or useless e-mail could be described as negative.

Do you have to have a telephone service?

That depends on how you define need. For today's world to run properly in the delivery of services goods the organization of care and medical facility's and virtually every aspect of everyday life a good system of communication is required. If we were to cut the telephone system today people would die as a result within 10 minutes, If we are not concerned about this then you can say we do not need telephones. After all we can do without most things but we chose not to.

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