C. F. Ribeiro Pacheco

WI-FI Point-to-Point Links: Performance Aspects of IEEE 802.11a, b, g Laboratory Links

Wireless communications using microwaves are increasingly important, e.g. Wi-Fi. Performance is a very relevant issue, resulting in more reliable and efficient communications. Laboratory measurements are made about several performance aspects of Wi-Fi (IEEE 802.11 a, b, g) point-to-point links using two types of access points from Enterasys Networks (RBT-4102 and RBTR2). Through OSI levels 3, 4 and 7, detailed results are presented and discussed, namely: latency, ICMP packet loss, TCP throughput, jitter, percentage datagram loss and FTP transfer rate.

Wi-Fi Wep Point-to-Point Links

The importance of wireless communications has been growing. Performance is a crucial issue, resulting in more reliable and efficient communications. Security is equally important. Laboratory measurements are made about several performance aspects of Wi-Fi (IEEE 802.11a, b, g) WEP point-to-point links. A contribution is given to performance evaluation of this technology, using two types of access points from Enterasys Networks (RBT-4102 and RBTR2). Detailed results are presented and discussed, namely at OSI levels 4 and 7, from TCP, UDP and FTP experiments: TCP throughput, jitter, percentage datagram loss and FTP transfer rate. Comparisons are made to corresponding results obtained for open links. Conclusions are drawn about the comparative performance of the links.

Extended Performance Research on Wi-Fi IEEE 802.11 a, b, g Laboratory Open Point-to-Multipoint and Point-to-Point Links

The increasing importance of wireless communications, involving electronic devices, has been widely recognized. Performance is a crucial issue, leading to more reliable and efficient communications. Laboratory measurements were performed about several performance aspects of Wi-Fi (IEEE 802.11 a, b, g) Open point-to-multipoint links. Our study contributes to the performance evaluation of this technology, using new available equipments (V-M200 access points from HP and WPC600N adapters from Linksys). New detailed results are presented and discussed, namely at OSI levels 4 and 7, from TCP, UDP and FTP experiments: TCP throughput, jitter, percentage datagram loss and FTP transfer rate. Comparisons are made to corresponding results obtained for Open point-to-point links. Conclusions are drawn about the comparative performance of the links.

Extended Field Performance Evaluation of a Gbps FSO Link

Wireless communications have been increasingly important. Besides Wi-Fi, FSO plays a very relevant technological role in this context. Performance is crucial, resulting in more reliable and efficient communications. A FSO medium range link has been successfully implemented for high requirement applications at Gbps. An extended field performance evaluation of this link has been carried out at OSI layers 1, 4 and 7, through a specifically planned field test arrangement. Measurements have been made both for powers received by the laser heads, and TCP, UDP and FTP experiments, resulting in determinations of TCP throughput, jitter, percentage datagram loss and FTP transfer rate. Corresponding results are presented and discussed. Conclusions are drawn about link performance.

Extended Performance Studies of Wi-Fi IEEE 802.11 A, B, G Laboratory Wep Point-to-Multipoint and Point-to-Point Links

Wireless communications using microwaves are increasingly important, such as Wi-Fi. Performance is a most fundamental issue, leading to more reliable and efficient communications. Security is equally very important. Laboratory measurements were performed on several performance aspects of Wi-Fi (IEEE 802.11a, b, g) WEP point-to-multipoint links. Our study contributes to performance evaluation of this technology, using available equipments (DAP-1522 access points from D-Link and WPC600N adapters from Linksys). New detailed results are presented and discussed, namely at OSI levels 4 and 7, from TCP, UDP and FTP experiments: TCP throughput, jitter, percentage datagram loss and FTP transfer rate. Comparisons are made to corresponding results obtained for WEP point-to-point and Open point-to-multipoint links. Conclusions are drawn about the comparative performance of the links.

TCP, UDP and FTP Performances of Laboratory Wi-Fi IEEE 802.11g WEP Point-to-Point Links

Wireless communications, e.g. Wi-Fi, have been increasingly important in the context of networked and virtual organizations and enterprise information systems. Performance is an issue of fundamental importance, resulting in more reliable and efficient communications, therefore improving enterprise information system yield. Security is equally important. Laboratory measurements are made about several performance aspects of Wi-Fi IEEE 802.11g WEP point-to-point links. A contribution is given to performance evaluation of this technology under WEP encryption, using available access points from Enterasys Networks (RBT-4102). Detailed results are presented and discussed, namely at OSI levels 4 and 7, from TCP, UDP and FTP experiments, permitting measurements of TCP throughput, jitter, percentage datagram loss and FTP transfer rate. Comparisons are made to corresponding results obtained for open links. Conclusions are drawn about the comparative performance of the links..

Extended Performance Research on 5 GHz IEEE 802.11n WPA2 Laboratory Links

Wireless communications by microwaves are increasingly important, e.g. Wi-Fi. Performance is a crucial issue, improving reliability and efficiency in communications. Security is also most important. Laboratory performance measurements are presented for Wi-Fi 5 GHz IEEE 802.11n WPA2 links. Our study contributes to performance evaluation of this technology under WPA2 encryption, using available equipments (HP V-M200 access points and Linksys WPC600 N adapters). New results are given, namely for OSI level 4, from TCP and UDP experiments. TCP throughput is measured versus TCP packet length. Jitter and percentage datagram loss are measured versus UDP datagram size. Results are compared for point-to-point, point-to-multipoint and four-node point-to-multipoint links. Comparisons are also made to corresponding data obtained for Open links. Conclusions are drawn about performance of the links.

Wi-Fi IEEE 802.11 B,G WEP Links

Wireless communications using microwaves are increasingly important, e.g. Wi-Fi. Performance is a most crucial issue, leading to more reliable and efficient communications. Security is equally important. Laboratory measurements are made about several performance aspects of Wi-Fi (IEEE 802.11b, g) WEP point-to-point links. A contribution is given to performance evaluation of this technology under WEP encryption, using two types of equipments (RBT-4102 access points from Enterasys Networks and WRT54GL wireless routers from Linksys). Detailed results are presented and discussed, at OSI levels 1, 4 and 7, namely from TCP, UDP and FTP experiments: SNR, TCP throughput, jitter, percentage datagram loss and FTP transfer rate. Detailed comparisons are made and conclusions are drawn about the comparative performance of the links.

Wi-Fi Point-to-Point Links

Wireless communications using microwaves are increasingly important, e.g. Wi-Fi. Performance is a crucial issue, leading to more reliable and efficient communications. Security is equally very important. Laboratory measurements are made about several performance aspects of Wi-Fi (IEEE 802.11b, g) WPA2 point-to-point links. A contribution is given to performance evaluation of this technology under WPA2 encryption, using available equipments (WRT54GL wireless routers from Linksys). Detailed results are presented and discussed, namely at OSI levels 4 and 7, from TCP, UDP and FTP experiments: TCP throughput, jitter, percentage datagram loss and FTP transfer rate. Comparisons are made to corresponding results obtained for open, WPA and WEP links. Conclusions are drawn about the comparative performance of the links.