HS X.25 and RFC1613 XOT C Source Library - Version 1.3.18 HS X.25 is a software library in C (supplied with full source code) which implements ITU-T recommendation X.25 - Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedicated circuit. HS X.25 includes RFC1613 Cisco XOT protocol for X.25 over TCP applications.HS X.25 runs on Windows and Unix / Linux / Solaris and other OSesHS X.25 supports SVCs and PVCsHS X.25 internally at a lower layer interfaces to HsDL library. HsDL library is Data Link layer abstraction. When HS X.25 is ported into environment with LAPB or LAPD as data link layer, only HsDL module needs to change. HsDL links directly to HsSock module (also included in