- A PPP FRAME INCLUDES FCS SERIAL
- A PPP FRAME INCLUDES FCS FULL
- A PPP FRAME INCLUDES FCS PLUS
- A PPP FRAME INCLUDES FCS FREE
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.
A PPP FRAME INCLUDES FCS 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.
A PPP FRAME INCLUDES FCS 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
A PPP FRAME INCLUDES FCS PLUS
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In the latter case, the network consumes.
A PPP FRAME INCLUDES FCS SERIAL
In IP addressing, the PPP link can be treated as an unnumbered serial interface (no IP address assigned) or then as a network. In case of mobile backhaul, IP is encapsulated into PPP by marking the protocol field accordingly, and then including data and optional padding. 2 byte FCS is the default, 4 byte FCS may be negotiated. Other values may be negotiated.įrame Check Sequence (FCS), is calculated over the entire frame. Together the information and padding may include up to 1500 octets, which is the default value for the Maximum Receive Unit (MRU). Information consists of data to be transmitted, and padding may be included. Protocol indicates the protocol carried in the information field. Control fields consists of ‘00000011’, other values may be used if so agreed. Address field is typically a broadcast field of all ‘1’s, meaning all stations. A flag marks the start of the frame with a bit sequence ‘01111110’.
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