Netlab packet v switched circuit networks Free essay! Download now
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Netlab packet v switched circuit networks
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| Words: 2815 | Submitted: 31-Mar-2011
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DescriptionPacket v circuit switched networks and Packet-switched network
Packet v circuit switched networks
In circuit switched networks, the data follows one path only from source to destination. Paths are fixed and connections are made using a dialled number. When this number is dialled it sets switches along the route of the call to create a continuous circuit. Traffic throughput on this circuit can vary, which does not utilise the full bandwidth provided. This then makes circuit switched networks the more expensive of the 2 methods. Another term for this type of network is a dedicated “leased line” network. This type of network can be permanently connected or can be created on demand and is only used by one customer at a time. When one customer has finished with the connection, a disconnect phase is started to release the line which can then be used by another customer.
This type of network is viewed as a “real time” network due to the reduced latency in comparison to packet switching.
In packet switched networks, the data is split into packets and each packet may take a different route from source to destination, at which the packets are reassembled. The packet header contains information which allows the packet to be routed to its destination and subsequently reassembled. These networks are usually shared amongst many companies, so the cost is significantly less than a dedicated leased line. The down side to this is that these are generally slower than circuit switched networks. This sharing is completed by a technology called time division multiplexing. A piece of equipment called a multiplexer / demultiplexer is required at each end of a 2 way communication channel. The multiplexer is then used to combine separate signals into a composite signal at the sending end and a demultiplexer at the receiving end is used to separate the signals where they are then sent on to the destination.
A technique called “pipelining” is used in packet switching and works in the following manner:
Packet 1 is sent from source to destination and arrives at node 1.
Packet 1 is sent from node 1 to node 2 while packet 2 is sent from source to destination which then arrives at node 1.
Packet 1 is sent from node 2 to node 3 while packet 2 is sent from node 1 to node 2 while the third packet is sent from source to node 1. This process continues until all packets have arrived at the destination and are reassembled. Packets can be queued or buffered throughout their journey which may cause a variable delay.
There are 2 types of packet switched network:
Virtual circuit packet switching networks
This type of network is ...
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