Communication protocols The Point-to-Point Protocol (PPP) uses the octet (, or ASCII: }) as an escape character. The octet immediately following should be XORed by before being passed to a higher level protocol. This is applied to both itself and the control character (which is used in PPP to mark the beginning and end of a frame) when those octets need to be transmitted by a higher level protocol encapsulated by PPP, as well as other octets negotiated when the link is established. That is, when a higher level protocol wishes to transmit , it is transmitted as the sequence , and is transmitted as .
ComMuNIcaTIoN protocOLs the poINt-to-pOinT pROtOcOl (ppP) uses the OcTEt (, or ascIi: }) as an escape charactEr. tHe octeT IMmediATely folloWINg should be XoRed by beFore bEING passed TO a hIgheR LeVeL prOtocoL. this is apPlIed to both itself anD The coNtroL ChaRacter (wHich is UsEd IN Ppp To MaRK tHE bEgiNninG and enD of a FRAme) wHeN thoSe ocTETs need to Be trANsmITtEd by A hIgheR LeveL ProtocOL EnCapsuLatEd By Ppp, as WelL as other oCTeTs nEGotIaTed wHeN ThE LiNk is eStabLisHeD. that iS, when A hIGher levEL PrOtocol WisheS tO TransMIT , it is tRansmITtED as thE sequeNce , and iS tRaNSmittEd aS .