Session
Technical Session IX: Advanced Operations Concepts
Abstract
The throughput results for file transfers using file sizes ranging from 1 Kbyte through 1 Mbyte using both the standard TCP/IP and SCPS protocol stacks are reported here. The file transfers are performed at a range of balanced and unbalanced link speeds and channel error rates. The host computers used in the simulations are using standard Linux operating system configurations on PC platforms. The PPP is used as a framing protocol to support communications between the computers. The file-transfer throughput results will show the effects of link configuration and channel error rate on the necessary time to transfer a file. Because the operating system can be configured with different options for the protocols, for example enabling packet header compression, these options need to be factored into the comparison. As part of the throughput reporting, we will show the effects of header compression and selection of congestion algorithm upon the results. The TCP/IP ftp and SCPS-FP using VJ congestion control algorithm results give similar results and better results than SCPS-FP with the Vegas congestion control algorithm in these experiments. No noticeable delay effects were noted with links delays corresponding to GEO orbits with file transfers of 1 Mbyte.
Effects of Networking Configurations on Space Channel Throughput
The throughput results for file transfers using file sizes ranging from 1 Kbyte through 1 Mbyte using both the standard TCP/IP and SCPS protocol stacks are reported here. The file transfers are performed at a range of balanced and unbalanced link speeds and channel error rates. The host computers used in the simulations are using standard Linux operating system configurations on PC platforms. The PPP is used as a framing protocol to support communications between the computers. The file-transfer throughput results will show the effects of link configuration and channel error rate on the necessary time to transfer a file. Because the operating system can be configured with different options for the protocols, for example enabling packet header compression, these options need to be factored into the comparison. As part of the throughput reporting, we will show the effects of header compression and selection of congestion algorithm upon the results. The TCP/IP ftp and SCPS-FP using VJ congestion control algorithm results give similar results and better results than SCPS-FP with the Vegas congestion control algorithm in these experiments. No noticeable delay effects were noted with links delays corresponding to GEO orbits with file transfers of 1 Mbyte.
