By James H. Green
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Extra info for Access technologies : DSL and cable
Some types of DSL ride on top of a POTS line, while others use the cable pair down to a DC level, which precludes the use of a POTS line. 1 shows the layout of DSL service. The DSLAM demultiplexes the signal from the subscriber, splitting the service so the telephone service connects to the central office while the data portion feeds into the ILEC’s backbone network, where it is routed to the service provider. DSL is not an ILEC monopoly service. ILECs typically did not lease bare cable pairs until the Telecommunications Act of 1996 required them to make unbundled network elements (UNEs) available at any feasible interconnection point.
More frequently, a routing protocol such as IP is used and the network is connected through routers. The TCP/IP protocol falls under the blanket of packet switching. S. Department of Defense initially conceived packet switching as a security measure. If a message is broken into small packets and sent through the core network over random patterns, it is difficult to reassemble the message except at the access point. If the access circuit is kept short, it is easy to secure. Furthermore, if the core network has plenty of bandwidth, packets from other sessions can be interleaved to use the excess capacity.
The first reason is that cells can be switched in hardware, which is faster than routing. The fixed cell length makes it easier to maintain a high degree of utilization. The second reason is that it is easier to control latency and jitter, which are critical quality of service (QoS) elements in real-time applications such as voice and video. If a cell is lost in transmission, it has a minimal impact on quality because the amount of voice or video information contained in one cell is negligible.