05-05-2012, 10:43 AM
Networking Essentials
4 wire 1.ppt (Size: 2.61 MB / Downloads: 35)
Terms You Should Know
Circuit – the path over which two-way communication takes place (line)
Link – a segment of a circuit between two points (nodes)
Node – (1) a functional unit that connects two links; (2) an end point on a circuit or a junction point of two or more circuits
Multi-Point Circuits
Several nodes are connected to the same circuit
Less expensive than having separate point-to-point circuits
Useful for handling low volume traffic from multiple nodes; line sharing without impact
Normally found in WANs
2-wire and 4-wire Circuits
Normally, in a 4-wire circuit, 2 wires provide transmission in one direction; the other 2 wires in the other direction
2-wire is common; your telephone
4-wire circuits are consider special services and must be ordered and leased from the Carrier