Access Technologies: DSL and Cable by James H. Green

By James H. Green

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Frame relay is a convenient and flexible protocol, but the access circuit is a problem for both carrier and the customer. Only two choices are available: 56/64 kbps or full T1/E1. The carriers pass the access cost along to the user, but they bear the cost of transporting the data to their switch node. Newer access technologies such as DSL are advantageous because they can concentrate the traffic into a broadband circuit much closer to the customers. Since DSL terminates at the wire center, frame relay frames can be routed over a cable pair to the wire center, where they are concentrated onto the LEC’s backbone and routed over a shared network to the IXC.

An SVC is set up by the application and is charged like a telephone call. Like all modern protocols, ATM is a layered protocol. User applications communicate with the ATM adaptation layer (AAL). The AAL is divided into two sublayers, the segmentation and reassembly (SAR) and the convergence. The SAR segments outbound traffic and reassembles it inbound. The convergence sublayer protocols are different for the various types of information such as voice, video, and data. The AAL supports five different classes of traffic: Data Transmission Fundamentals 33 1.

The carrier sets it up and it remains set up until disconnected by service order. An SVC is set up by the application and is charged like a telephone call. Like all modern protocols, ATM is a layered protocol. User applications communicate with the ATM adaptation layer (AAL). The AAL is divided into two sublayers, the segmentation and reassembly (SAR) and the convergence. The SAR segments outbound traffic and reassembles it inbound. The convergence sublayer protocols are different for the various types of information such as voice, video, and data.

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