What is E1?
What is T1?
What is PCM?
What is pulse code modulation?
What is the digital transmission?
What is the Optical transmission?
What is T1 data rate?
What is E1 Data rate?
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About Academy
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Academy of Technology
Academy of Technology is an online resource in Urdu and Hindi languages.
The website focuses on providing quality video lectures and notes related to topics. Our aim is to help people by giving them comprehensive information and techniques to improve their knowledge in computer and communication networking. Our focused audience is beginner level but some topics need some background.We are opening doors for everyone to get some knowledge.Our target study areas are
Technology.
Computer Networks.
Telecom Networks.
IT Trainings.
Basic Sciences
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To be recognized and respected as one of the best online educational resources.
Mission
Our mission is to provide best online education in the Urdu language.
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About me
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Hafiz Salman Ahmad
MS Computer and Communication Networks
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E1 and T1 Lines
E1 and T1 standards are basically introduced for voice communication.both are using TDM for frame formation.In this video, we will discuss the digital transmission, its advantages, and disadvantages.Basic concept about Modulation, Multiplexing, and PCM is already discussed.
Digital Transmission
Transmission of digital signals from one point to another point or from one system to another system.
The signal source may be analog but at the transmitter side, it must be converted to digital and at receiver side again into analog.
In digital transmission, a physical media is used between endpoints, as it could not travel in free space.
Why digital transmission
Less susceptible to interference caused by noise due to the discrete level.
Easy to detect errors due to the discrete level.
Easy to encrypt(Higher security).
Cheaper to implement due to advancement in digital electronics.
Digital signal is better suitable for multiplexing.
It is simpler to store a digital signal.
Disadvantages
Require precise time synchronization.
Require more bandwidth than simply transmitting the analog signal.
Additional encoding and decoding process is required for analog signal.
Not compatible with the older transmission system.
Modulation
Modulation is the process of changing the properties of one signal(carrier) with respect to another signal (Information).
PCM
In PCM(Pulse-code modulation) an analog signal is sampled and converted to a series of binary bits.
E1
E1 is European standard and its basic data rate is 2.048Mbps.It has 30 voice channel and 02 control channel.
T1
T1 is American standard and its basic data rate is 1.544Mbps.It has 24 voice channel and 01 framing bit.
