In particular, such signals SHOULD be used to When available, using such signals can allow greater functionalityĪnd performance. To Send (RTS), Clear To Send (CTS), Data Carrier Detect (DCD), and PPP does not require the use of control signals, such as Request Other than that of the particular DTE/DCE interface. PPP does not impose any restrictions regarding transmission rate, No provision for sub-octets to be supplied or accepted. PPP presents an octet interface to the physical layer. Synchronous mode, transparent to PPP Data Link Layer frames. The onlyĪbsolute requirement imposed by PPP is the provision of a full-duplexĬircuit, either dedicated or circuit-switched, which can operate inĮither an asynchronous (start/stop), bit-synchronous, or octet. PPP is capable of operating across most DTE/DCE interfaces (such as,ĮIA RS-232-C, EIA RS-422, EIA RS-423 and CCITT V.35). Logging the error, including the contents of the silentlyĭiscarded packet, and SHOULD record the event in a statistics The implementation SHOULD provide the capability of
This means the implementation discards the packet without further The other end of the point-to-point link. Packets are incorporated into a single frame. Link layer fragmentation is being performed, or when multiple Packet is usually mapped to a frame the exceptions are when data Interface between the network layer and the data link layer. The basic unit of encapsulation, which is passed across the Include a header and/or a trailer, along with some number of units The unit of transmission at the data link layer.
Aĭatagram may be encapsulated in one or more packets passed to the The unit of transmission in the network layer (such as IP). This document frequently uses the following terms: RFC 1549 HDLC Framing Decvember 1993 1.2 Terminology An implementation whichĭoes not include this option MUST be prepared to interoperate withĪnother implementation which does include the option. This word, or the adjective "optional", means that this item is Weighed before choosing a different course.
#Ppp frame flag full#
Item, but the full implications must be understood and carefully This word, or the adjective "recommended", means that there mayĮxist valid reasons in particular circumstances to ignore this This phrase means that the definition is an absolute prohibition
Is an absolute requirement of the specification. This word, or the adjective "required", means that the definition In this document, several words are used to signify the requirements This is commonly available in hardware implementations, and a PPP uses the HDLC Frame Check Sequence for error detection.
#Ppp frame flag free#
Some protocols expect error free transmission, and either provideĮrror detection only on a conditional basis, or do not provide it atĪll. Spurious control data which may be injected into the link by XON/XOFF to be transmitted transparently over the link, and to remove PPP uses HDLC as a basis forĪn escape mechanism is specified to allow control data such as These links MUST be full-duplex, but MAY beĮither dedicated or circuit-switched. Octet-oriented synchronous links, and asynchronous links with 8 bits This specification provides for framing over both bit-oriented and Fast Frame Check Sequence (FCS) Implementation. Working Group of the Internet Engineering Task Force (IETF).Ĭomments should be submitted to the mailingġ. This document is the product of the Point-to-Point Protocol
This document describes the use of HDLC for framing PPP encapsulated Transporting multi-protocol datagrams over point-to-point links. The Point-to-Point Protocol (PPP) provides a standard method for Official Protocol Standards" (STD 1) for the standardization stateĪnd status of this protocol. Please refer to the current edition of the "Internet Internet community, and requests discussion and suggestions for This document specifies an Internet standards track protocol for the
0 kommentar(er)
