Avaya Configuring Line Services Bedienungsanleitung Seite 38

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Configuring Line Services
2-2 114078 Rev. A
Ethernet Overview
Ethernet is a 10-megabit/second (Mb/s) or 100-Mb/s LAN that uses the Carrier
Sense Multiple Access with Collision Detection (CSMA/CD) protocol to control
access to the physical wiring (media).
Data Flow
When a node on an Ethernet LAN (endstation) transmits data, every endstation on
the LAN receives the data. Each endstation checks each data unit to see whether
the destination address matches its own address. If the addresses match, the
endstation accepts and processes the packet. If they do not match, it disregards the
packet.
Medium Access Control
Endstations use CSMA/CD to monitor the media and wait until it is idle before
transmitting data.
Carrier Sense Multiple Access
Before attempting to transmit a message, an endstation determines whether or not
another endstation is transmitting a message on the media. If the media is
available, the endstation transmits the message; if not, the endstation delays its
transmission until the other endstation has finished sending.
Collision Detection
If two endstations transmit data simultaneously, a collision occurs and the result is
a composite, garbled message. All endstations on the network, including the
transmitting endstations, detect the collision and ignore the message. Each
endstation that wants to transmit waits a random amount of time and then attempts
to transmit again. The random transmission delays reduce the probability that the
endstations will transmit simultaneously again.
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