3Com 4007, Implementation Manual, Page: 148 / 684

148 C
HAPTER
8: E
THERNET
Key Concepts
These concepts are important to implementing Ethernet:
■
Carrier Sense Multiple Access with Collision Detection
(CSMA/CD)
— The standardized Ethernet protocol that controls
device access to the network
■
Collision — When two or more stations attempt to transmit
simultaneously
■
Port mode — An Ethernet port’s speed and duplex mode
■
Port speed — 10 Mbps (Ethernet), 100 Mbps (Fast Ethernet),
1000 Mbps (Gigabit Ethernet)
■
Port state — Whether a port is enabled (placed online) or disabled
(placed off-line)
■
Duplex mode — Whether a port supports one-way (half-duplex) or
two-way (full-duplex) transmissions
■
Autonegotiation — A feature that allows some ports to identify and
negotiate speed and duplex mode with a receiving device.
■
Flow control — A Fast Ethernet or Gigabit Ethernet port mode that
pauses and resumes transmissions
■
Trunking — A technology that combines multiple Fast Ethernet or
Gigabit Ethernet ports into a single high-speed channel, thereby
increasing bandwidth between switches and between servers and
switches
■
Trunk Control Message Protocol (TCMP) — A protocol that detects
and handles physical configuration errors in a point-to-point
configuration, thereby increasing availability of trunked links
■
Gigabit Interface Converter (GBIC) — A Gigabit Ethernet port
media type that allows you to hot-swap one media connector without
affecting the other connectors