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The plain old telephone service/public switched telephone network provides access through conventional telephone lines using a modem to receive transfer rates as high as 56 Kbps A number of wireless providers now give mobile access to handheld devices
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Networks have become such an important element in the business world that most businesses could not survive the loss of their network Wide area networks (WANs) have evolved to allow the connection of multiple local area networks (LANs) that are not within close proximity WANs allow the multiple LANs to operate as a single large network for growing companies The different WAN technologies include Asynchronous Transfer Mode (ATM), which can also be used to create a LAN ATM provides bandwidth on demand for users using an optical network ATM can provide transfer rates as high as 622 Mbps Another WAN technology is SONET/SDH, which uses optical carrier (OC) levels These use fiber-optic cables to transfer data from different media Data streams can be taken from different media and combined into one data stream, allowing for transmission speeds from 5184 Mbps to 995328 Mbps The nonSONET media are connected to a physical terminating equipment (PTE) device, which converts the electrical signals into optical signals The optical signal is sent to the line-terminating equipment (LTE), which transmits the signal over different sections of fiber-optic cable The many different sections of fiber-optic cable making up the SONET network are terminated by section-terminating equipment (STE) The OC levels are standards used to specify bandwidth over fiber-optic cable Another WAN technology is Frame Relay Frame Relay is a leased-line solution whereby a company can share the medium and the cost with other companies The amount of bandwidth available to a company is determined by the amount of bandwidth for which it pays FDDI is another WAN technology that is based on the Token Ring topology It operates at 100 Mbps over fiber-optic or category-5 cables A setup using category-5 cables is known as a Copper Distributed Data Interface (CDDI) FDDI is composed of two rings operating in different directions The second ring is used only if the first ring fails Popular transmission methods are T-carriers and E-carriers Each carrier is used in different countries with different bandwidths The T- and E-carriers are completely digital and operate at speeds as high as 565148 Mbps High-speed Internet services can be provided through ADSL or cable modem ADSL provides download speeds at approximately 9 Mbps and runs the voice and data services over the copper telephone wires at various frequencies The cable companies provide high-speed Internet services with download speeds of about 10 Mbps; they supply this data to your home using a different channel on the coaxial cable
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q Packet-switching networks use whatever pathway is best at the time to reach
the destination network, whereas circuit switching uses a dedicated pathway for the duration of the communication
q Packet switching is a more efficient use of bandwidth than circuit switching q Packet-switching networks might not deliver packets in the order they
were sent
asynchronous transfer Mode
q ATM is used by applications that require high amounts of bandwidth q ATM has a transfer rate of 622 Mbps q Data packets are referred to as cells and are a consistent 53 bytes in size
synchronous optical network/synchronous Digital Hierarchy
q SONET is used to unify unlike transmissions into one transmission data stream q SONET uses fiber-optic cable for transmissions q SDH is the European standard for SONET q Bandwidth ranges from 5184 Mbps to 995328 Mbps
optical Carrier Level-x
q OC is used to specify bandwidth standards over fiber-optic media q The OC levels are used by SONET and SDH levels q OC-1 is 5184 Mbps q OC-3 is 15552 Mbps q OC-48 is 2488 Gbps
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