1 VP#5 VP#4 VP#2 VP#1 VP#3 VP#6 Performance Evaluation of Video/Voice/Data Integration Over VP-Based ATM Ring Network E. A. Khalil, A. El-Sayed Dept. of Computer Science & Engineering Faculty of Electronic Engineering, Menoufia University, Menouf, EGYPT. Abstract- Virtual Path (VP) provisioning has gained wide acceptance as an effective resource management technique for improving transmission efficiency in ATM network. In this paper, the integration of video, voice, and data over VP-Based ATM Ring network is presented. To achieve fairness among the traffics, we have proposed a control mechanism method, which confirms its effectiveness and fairness for integrated of multimedia traffics on the proposed network. index terms: VP-Based Ring ATM network, integration multimedia traffic. 1 Introduction It is well known that the implementing B-ISDN requires a network control scheme that can handle bursty traffic with unexpected fluctuations. The ATM technology provides this flexibility by virtualizing network resources through the use of the Virtual Path (VP) concept [1]. The virtual path (VP) provisioning is an effective resource management technique for improving transmission efficiency in ATM networks. The benefits of using VPs are: reduced node processing per virtual circuit, simplified node structure and increased opportunity to optimize resources such as bandwidth [2]. ATM networks have the capability to provide a wide range of services and guarantee various end-to-end QoS [3]. The basic transmission unit for ATM is a cell with 53 bytes. Each cell with a fixed length simplifies the process of segmentation and reassembly. When the cell routes through a switch node, Virtual Path Identifier (VPI) and Virtual Channel Identifier (VCI) in the cell header are used for looking up switching tables to quickly decide the output VPI, VCI, and port number for completion of switching. Several Virtual Paths (VPs) and Virtual Channels (VCs) can be multiplexed to share a link bandwidth. By fast switching technology and flexible multiplexing, ATM has the advantages of both circuit switching and packet switching. One important characteristic of ATM network is that the ATM networks support various service types to meet application with different QoS [4,5,6]. This paper investigates the performance evaluation of the ATM ring network for carrying video, voice, and data traffics. 2 The Proposed Network The proposed network is a VP-Based ATM Ring Network based on a ring topology modified to the architecture in [7]. In our study the VP in the ring is defined as pair for each node, which preassigned a duplex VP. Figure 1 illustrates (Synchronous Optical NETwork) SONET/ATM Ring Architecture using point-to-point VP`s (denoted by SARPVP). The VP is used in the point- to-point VP Add-Drop multiplexing (VP-ADM) scheme carries VC between the same two ring nodes. As mentioned in the VP-Based architecture, each ring`s node pair is preassigned a duplex VP. For example, from Figure 1, VP#2 and VP#2` (not shown in the Figure) carry all VCs from Node 1 to 3 and from Node 3 to Node 1 respectively. The physical route assignment for the VP depends on the type (unidirectional/bi-directional) of the considered SONET ring. Figure 1 VP-Based ATM Ring network. In a unidirectional ring, two diverse routes, which form a circle, are assigned to each VP as shown in Figure 1. Two physical routes 1-2-3 and 3-4-1 are assigned to VP#2 and VP#2` (not shown in the Figure). In a bi- directional, only one route is assigned to each duplex VP (e.g., route 1-2-3 is assigned to both the VP#2 and VP#2`), and demands between Node 1 and 3 are routed through Route 1-2-3 bidirectionally for more details on SONET unidirectional and bi-directional ring architecture see [8,9]. In order to avoid the VP translation 1 4 2 3