TECHNICAL INFORMATION

Introduction to SCPS-TP

The Space Communications Protocols Specification (SCPS) defines a set of revisions to the Internet protocols to enable them to operate properly over stressed communications links. It extends normal TCP/IP to become an ’upgraded’ TCP. XipLink is an independent, high performance implementation of the SCPS-TP standard, with further extensions and enhancements for satcom link optimization.

XipLink Wireless Optimizer Performance

XipLink XA-4000 optimizer’s were installed at a hub-site and a remote site across a VSAT network. The hub-site was allocated 5 Mbps of forward channel (uplink) capacity, while the remote site was allocated 2.5 Mbps of forward channel (uplink) capacity. The delay on this network averaged 600 MSec Round Trip Time (RTT). XipOS - Fixed Rate Control algorithm was selected.

The primary method used to determine the benefits of XipLink wireless optimization software is to transfer several well known files with different characteristics across the wireless link while measuring the usable bandwidth.

Standards Compliance

XipLink is fully compatible with the Space Communications Protocol (SCPS-TP) standard, as well as the I-PEP standard. Protocol Implementation Conformance Statements (PICS) are available on request.

XipLink remains committed to standards compliance wherever possible and all optimization negotiations are always carried out using standards based methods. In the interests of optimized performance, XipLink makes use of proprietary extensions within these standards but there is no requirement to reconfigure the software in a ’standards-compatibility’ mode.

XipLink is the most comprehensive SCPS-TP solution for data acceleration and compression and supports all major capabilities.

XipLink also supports the Interoperable PEP ( I-PEP) standard, as published by SatLabs.

For a comprehensive overview the standards supported by XipLink, please review the XipLink Standards Compliance data sheet.