Posts Tagged ‘router’
July 25th, 2008 | 
Author: Planning & Cabling Networks
Media Required to Make a LAN Connection:
LANs use gateways to connect o other networks.
They use hubs or switches to connect end devices.
Each port on a router connects to a different network.
Routers break up broadcast domains and collision domains.
Routers can have both LAN and WAN interfaces.
Intranetwork Devices:
Hub
Receives signals, regenerates and sends them over all ports.
Creates a logical bus (i.e. multi-access media, everybody is on the same wire). [topologies].
Shared bandwidth approach – reduced performance (only one device can talk at a time).
A single collision domain.
Less expensive than switches.
Prepare your router for the Wide Area Network.
Cisco devices use HLDC encapsulation by default.
Serial COMMUNICATION
Serial connections send 1 data bit at a time when transmitting.
Parallel Connections send multiple bits simultaneously.
Theoretically an 8 bit parallel bus, transfers data 8X faster.
Serial connections can be clocked much faster than parallel links.
2 of the main factors that affect parallel communication are clock skew & cross talk.
Clock skew – some parallel bits arrive later than others.
Overcoming clock skew is difficult & involves clocking.
Cross-Talk – crosstalk normally refers to a signal affecting another nearby signal.