Chapter 8: Wired LAN's: Ethernet

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Chapter 8: Wired LAN's: Ethernet by Mind Map: Chapter 8: Wired LAN's: Ethernet


1.1. Data Link Layer

1.1.1. logical link control (LLC) sublayer

1.1.2. medium access control (MAC) sublayer

1.2. Physical Layer

1.2.1. physical layer signaling (PLS) sublayer

1.2.2. attachment unit interface (AUI)

1.2.3. medium attachment unit (MAU)

1.2.4. medium dependent interface (MDI)


2.1. Standard Ethernet (10 Mbps)

2.2. Fast Ethernet (100 Mbps)

2.3. Gigabit Ethernet (1000 Mbps)

2.4. Ten-Gigabit Ethernet (10 Gbps)


3.1. MAC Sublayer

3.1.1. governs the operation of the access method

3.1.2. frames data received from the upper layer & passes them to the PLS sublayer for encoding

3.1.3. Frame Format preamble start frame delimiter (SFD) destination address (DA) source address (SA) length of protocol data unit (PDU) data CRC

3.1.4. Frame Length Ethernet imposed restrictions on both min & max length of frame min frame = 64 bytes max frame = 1518 bytes

3.1.5. Addressing unicast destination = one-to-one multicast destination = one-to-many broadcast destination = all the stations on the network

3.2. Physical Layer

3.2.1. PLS encodes & decodes data Manchester encoding with data rate of 10 Mbps

3.2.2. AUI interfaces between the PLS & MAU

3.2.3. MAU transceiver transmitter receiver transmit signals over the medium, receives signals over the medium detect collisions

3.2.4. MDI piece of hardware for connecting a transceiver to the medium tap external transceiver or jack internal transceiver

3.3. Physical Layer Implementation

3.3.1. 10Base5: Thick Ethernet bus topology with external transceiver connected via tap to a thick coaxial cable

3.3.2. 10Base2: Thin Ethernet Cheapernet bus topology with internal transceiver point-to-point connection via external transceiver

3.3.3. 10Base-T: Twisted-Pair Ethernet physical star topology with internal/external transceiver connected to hub

3.3.4. 10Base-F: Fiber Link Ethernet star topology to connect stations to hub

3.4. Evolution

3.4.1. Bridge Ethernet unbridged ; total capacity is shared between all networks divides 2 or > networls, BW each network is independent Advantages capacity shared between smaller stations collision domain becomes smaller

3.4.2. Switched Ethernet BW only shared between the station & the switch collision domain is divided into N domains additional sophistication; allows faster handling of the packets

3.4.3. Full-Duplex Ethernet send/receive data at the same time simultaneously increases the capacity of each domain from 10 to 20 Mbps


4.1. MAC Sublayer

4.1.1. access method the same (CSMA/CD); except full duplex

4.1.2. frame format = Traditional Ethernet

4.1.3. autonegotiation; allows 2 devices to negotiate the mode/data rate of operation

4.2. Physical Layer

4.2.1. Reconciliation Sublayer (RS) replaces PLS in 10-Mbps Ethernet responsible that left over passing of data in 4-bit format to the MII encoding and decoding; PLS moved to PHY sublayer encoding is medium-dependent

4.2.2. Medium-Independent Interface (MII) replaces AUI in 10-Mbps improved interface; 10-Mbps & 100-Mbps

4.2.3. PHY Sublayer transceiver; responsible for encoding & decoding

4.2.4. Medium-Dependent Interface (MDI) piece of hardware; connecting transceiver to the medium

4.3. Physical Layer Implementation

4.3.1. 100Base-TX 2 pairs of twisted cable in physical star topology allows either external transceiver with MII cable OR internal transceiver transceiver; transmitting, receiving, detecting & encoding/decoding data

4.3.2. 100Base-FX 2 pairs of fiber optic cable in physical star topology

4.3.3. 100Base-4T 4 pairs of UTP for transmit 100 Mbps


5.1. MAC Sublayer

5.1.1. 2 distinctive approaches medium access: half duplex using CSMA/CD or full-duplex without CSMA/CD

5.1.2. no collision; max length determined by signal attenuation

5.2. Physical Layer

5.2.1. RS sends 8-bit parallel data to the PHY sublayer via a GMII interface

5.2.2. Gigabit Medium-Independent Interface (GMII) specification that defines how RS is to be connected to the PHY sublayer counterpart of MII in Fast Ethernet primarily a logical rather than a physical interface

5.2.3. PHY Sublayer transceiver that medium-dependent encodes & decodes; internal only

5.2.4. MDI connect transceiver to the medium RJ-45 & fiber optic connectors are defined

5.3. Physical Layer Implementation

5.3.1. 1000Base-SX 2 -wire short-wave fiber designed with internal transceiver

5.3.2. 1000Base-LX 2-wire long-wave fiber

5.3.3. 1000Base-CX 2-wire copper (STP)

5.3.4. 1000Base-T 4-wire UTP


6.1. GOALS

6.1.1. upgrade the data rate to 10Gbps

6.1.2. make it compatible with Standard, Fast and Gigabit Ethernet

6.1.3. make Ethernet compatible with technologies such as Frame Relay and ATM

6.1.4. use the same 48-bit address

6.1.5. allow interconnection of existing LANs into a MAN or a WAN

6.1.6. use the same frame format

6.1.7. same min & max frame length

6.2. not uses CSMA/CD