To extend the widespread use of HIPPI as a networking solutions for high-speed communications, the 25-meter distance limitation must be solved. Three options available for alleviating the problem of distance limitation are Serial-HIPPI. HIPPI/SONET mapping or HIPPI-ATM mapping, and IP Routing. Serial-HIPPI, HIPPI/SONET mapping and HIPPI-ATM mapping provide extended HIPPI connectivities at the physical layer, while IP Routing forwards data between HIPPI networks and other networks at the network layer. In this paper, we study two feasible solutions of this problem. HIPPI Tunneling (HIPPI-ATM mapping) and IP Routing. We compare these two schemes in terms of network connectivities, protocol overhead, and flow control. The performance evaluation of one implementation of HIPPI tunneling and IP Routing ns presented. Experimental performance suggests t h a t a high degree of bandwidth utilization was achieved by both HlPPl Tunneling and IP Routing in this implementation.
ATM (Asynchronous Transfer Mode) defmes several Quality of Service levels such as CBR (Constant Bit Rate) and VBR (Variable Bit Rate). Each service has parameters that are associated with its performance characteristic. The parameters used for specifying CBR service are Peak Cell Rate (PCR) and Cell Delay Variation Tolerance (CDVTOL). The parameters used for specifying VBR service are PCR, SCR (Sustainable Cell Rate), and BT (Burst Tolerance).The network takes responsibility for monitoring and policing the traffic of each VCCIVPC at the ingress of the network. The CPE needs to traffic shape at the ingress of the network in order to meet the contracted Q0S requirements. Measurement procedures and tools are required in order to provide a means of tuning the CPE and network service to meet the customer's end-to-end Q0S expectations. The following paper describes how the Generic Cell Rate Algorithm (GCRA) variables can be adjusted to provide acceptable levels of Quality of Service (QoS) in a mixed VBR, and CBR environment. In addition, the paper examines a methodology for measuring the performance of VBR and CBR services. The authors uses this information to build a QoS measurement tool.
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