- #A PPP FRAME INCLUDES A FCS WHICH IS A HOW TO#
- #A PPP FRAME INCLUDES A FCS WHICH IS A UPDATE#
- #A PPP FRAME INCLUDES A FCS WHICH IS A MAC#
It may also indicate the frame ID type if the frame is assembled using an optional format.(IEEE 802.3 only).
#A PPP FRAME INCLUDES A FCS WHICH IS A MAC#
It provides MAC information and indicates the number of client data types that are contained in the data field of the frame. Length / Type - This field is two bytes in length.
More details are given in the section below. This is always a single address and this is indicated within the address field. Source Address (SA) - The source address consists of six bytes, and it is used to identify the sending station.The address format used is the MAC address as detailed in a section below. Destination Address (DA) - This field contains the address of station for which the data is intended, this can be an individual address or multiple addresses as indicated by the destination address field.Start of Frame Delimiter (SFD) - This consists of one byte and contains an alternating pattern of ones and zeros but ending in two ones.Preamble (PRE) - This is seven bytes long and it consists of a pattern of alternating ones and zeros, and this informs the receiving stations that a frame is starting as well as enabling synchronisation.It enables the receiver to synchronise and know that a data frame is about to be sent. Preamble / SFD: - this element within the header is added by the layer 1 part of the protocol stack.The basic frame consists of seven elements split between three main areas:. The additional elements relate to the synchronising and preparation of the receiver to receive the data frame. In order to send the data over the Ethernet link, whether within a local area network, wide area network or other data link, some additional elements need to be added to the basic MAC data frame so that the data can be transmitted. Basic Ethernet layer 2 frame format Ethernet payload packet format Its format can be seen in the diagram below. The layer 2 format consists of the main elements of the data frame, but without some headers needed for the actual sending of the overall data. This is the frame format developed by the layer 2 elements of the stack, and this is then passed to the layer 1 physical layer to put it into the format for sending. The basic Ethernet frame in use today is referred to as the Ethernet type II frame. However most of the data sent over local area networks, wide area networks, etc, the standard formats for the Ethernet frames are used.
#A PPP FRAME INCLUDES A FCS WHICH IS A UPDATE#
With the high speeds and variety of media used, this basic format sometimes needs to be adapted to meet the individual requirements of the transmission system, but this is still specified within the amendment / update for that given Ethernet variant. They also enable the source to be identified for return messages.Įssentially the same frame structure is used for the different variants of Ethernet, although there are some changes to the frame structure to extend the performance of the system should this be needed. They enable the data to be sent to the required destination on the local area network, wide area network or whatever system is being used.
#A PPP FRAME INCLUDES A FCS WHICH IS A HOW TO#
Ethernet IEEE 802.3 Frame Format / Structure A summary of the Ethernet, IEEE 802.3, data frame format or structure and how Ethernet data frames are sent over local are networks, wide area networks, etc.Įthernet introduction Standards Ethernet data frame structure 100Mbps Fast Ethernet Gigabit Ethernet, 1GE 10 Gigabit Ethernet, 10GE Single Pair Ethernet, SPE Ethernet cables How to buy Ethernet cables Routers, hubs, switches - the differences Ethernet switch How to buy best Ethernet switch Ethernet industrial switch Power over Ethernet, PoE Ethernet splitter Carrier Ethernet Ethernet Products Shopping PageĮthernet, IEEE 802.3 defines the frame formats or frame structures that are developed within the MAC layer of the protocol stack.
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