|Title:||Packetized voice switching network (PVSN)|
|Subject:||Telephone switching systems, Electronic|
Telecommunication -- Switching systems
Packet switching (Data transmission)
TCP/IP (Computer network protocol)
Hong Kong Polytechnic University -- Dissertations
Department of Electronic and Information Engineering
|Pages:||91 leaves : ill. ; 30 cm|
|Abstract:||Packetized Voice Switching Network (PVSN) are expected to be deployed worldwide in the near future because of their potential for integrating the multimedia communication infrastructure over IP networks. Phone to Phone communicate over an IP network via PVSN is a key feature of the system. In a PVSN system, a low-bit-rate voice codec is used to improve bandwidth efficiency. However, due to the packet transfer method over the TCP/IP network (LAN) and ATM network (WAN) is necessary to add packet headers, including IP, UDP, and RTP headers or ATM cell header, which increases the header overhead and thus decreases transfer efficiency. Therefore, it is necessary to have a feasibility study about the packetized voice implementation over LAN and WAN as well as the architecture of the PVSN. This dissertation examines the feasibility of constructing a large distributed PVSN on 100BaseT Ethernet. A major problem with CSMA/CD, for speech transmission, is the inherent packetization delay which can considerably exceed the 2msec delay normally specified by PTT authorities for subscribers' premises networks (SPNs). Also, this dissertation considers the choice of parameters to minimize the delay on both LAN and WAN. The proposed PVSN architecture is aim to provide an alternative convergent solution to PBXs and CENTREX services. PVSN is in software-based building on Windows NT or Linux platform. The system will equip with Ethernet NIC, ATM 25Mbps NIC and ISDN-T1/FXO/E&M card. While local communications (extension call) is based on voice over IP over Ethernet, communications between remote location is based on voice over ATM. The reason of using voice over ATM technology for WAN communications is because ATM is the only technology can provide Quality of Service (QoS). The ISDN T1/E&M card provide the hop-off to traditional PSTN or PBX which enable the evolution of the voice network.|
Files in This Item:
|b15276016.pdf||For PolyU Staff & Students||3.36 MB||Adobe PDF||View/Open|
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item: