UNIT 3 Data communication concepts: Types of signals encoding and decoding techniques, signal bandwidth requirements, signal formats used in LAN., switchingandbroadcasttechniques, modulation, multiplexing, switching, networkprotocols. Data communication involves the transmission of digital data ove...
Data communication concepts: Types of signals encoding and decoding
techniques, signal bandwidth requirements, signal formats used in LAN.,
switchingand broadcasttechniques, modulation, multiplexing, switching,
networkprotocols.
Data communication involves the transmission of digital data over a communication
channel. The types of signals used in data communication include analog and digital
signals. Analog signals are continuous in nature and are used in radio and television
transmission, while digital signals are discrete and are used in computers and other
digital devices.
Encoding and decoding techniques are used to convert digital data into a form that
can be transmitted over a communication channel and then converted back to its
original form at the rec eiving end. These techniques include pulse-code modulation
(PCM)anddelta modulation (DM).
In a Local Area Network (LAN), digital signals are primarily used for data
communication. These signals are encoded using a variety of techniques to convert
digital data into a form that can be transmitted over the communication channel. The
most common encoding techniques used in LANs include:
Pulse-Code Modulation (PCM): This is the most widely used encoding
technique in LANs. It converts analog signals into digital signals by
sampling the analog signal at regular intervals and converting the samples
into a digital code. This method is used for both voice and data
transmission.
Differential Manchester Encoding: It is a method of encoding digital data on a
LAN. It is commonly used in LANs that use coaxial cable, it uses a special
encoding scheme that allows for a clock signal to be derived from the data
signal.
Manchester Encoding: This is a variation of differential Manchester
encoding, it uses a special encoding scheme that allows for a clock signal
to be derived from the data signal. It is commonly used in LANs that use
twisted-pair cable.
Decoding techniques are used to convert the encoded signal back to its original
form at the receiving end. Decoding techniques are the inverse of encoding
techniques. For example, the PCM decoding technique is used to convert
PCM-encoded signals back to their original analog form.
, The bandwidth requirement of a signal refers to the amount of frequency spectrum
required to transmit the signal. Different types of data and applications have different
bandwidth requirements. Ethernet, for example, uses a maximum bandwidth of 10 Mbps
or 100 Mbps or 1 Gbps or 10 Gbps or 40 Gbps or 100 Gbps or 400 Gbps or 1 Tbps
depending on the version used.
It's also worth noting that LANs use a variety of other signal formats, such as Fiber
Distributed
Data Interface (FDDI) and Token Ring, depending on the network type and topology.
The bandwidth requirement of a signal refers to the amount of frequency spectrum
required to transmit the signal. The signal format used in LAN (Local Area Network) is
typically Ethernet.
Types of signal formats in LAN
There are several types of signal formats used in Local Area Networks (LANs),
including:
1. Ethernet: This is the most widely used signal format in LANs. It uses a carrier
sense multiple access with collision detection (CSMA/CD) protocol for media access
control, and a packet- switched method of data transmission. Ethernet uses a
maximum bandwidth of 10 Mbps, 100 Mbps, 1 Gbps, 10 Gbps, 40 Gbps, 100 Gbps,
400 Gbps or1Tbps depending on theversion used.
2. Fiber Distributed Data Interface (FDDI): This signal format uses a
token-passing method of data transmission, and provides a maximum data rate of
100 Mbps.
3. Token Ring: This signal format uses a token-passing method of data
transmission and provides a maximum data rate of 16 Mbps or 100 Mbps
depending on the versionused.
4. Wireless LAN (WiFi): This signal format uses radio waves to transmit data, and
it has maximum data rate of 54Mbps, 150Mbps, 300Mbps, 600Mbps, 1Gbps or
2Gbps or 3Gbps or 4Gbps to 100Gbps depending on the version used.
5. Power Line Communication (PLC) this uses power lines in buildings and
homes to transmit data, and it can provide maximum data rate of 14Mbps,
85Mbps, 200Mbps, 500Mbps, or 1000Mbps depending on the version used.
6. HomePNA: This signal format uses the existing phone lines in a home to transmit
data, and it provides a maximum data rate of 3 Mbps.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller epicshorts. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
