segmentation and reassembly - definition. What is segmentation and reassembly
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%ما هو (من)٪ 1 - تعريف

PROCESS IN TELECOMMUNICATIONS
Segmentation and Reassembly
  • IDT]] 77155, a 155 Mbit/s ATM SAR controller chip

segmentation and reassembly         
Segmentation and reassembly         
Segmentation and reassembly (SAR) is the process used to fragment and reassemble variable length packets into fixed length cells so as to allow them to be transported across asynchronous transfer mode (ATM) networks or other cell based infrastructures. Since ATM's payload is only 48 bytes, nearly every packet from any other protocol has to be processed in this way.
Market segmentation         
  • The Model-T Ford (1921) is an early example of a mass marketing (undifferentiated segmentation) approach. Initially, it was produced only in black.
  • By the 1930s, Ford was producing Deluxe models in a range of colours such as this Ford Deluxe Coupe (1931)
  • Major bases used for segmenting a market
  • The marketing program is designed with the needs of the target market in mind
  • Visualisation of market segments formed using clustering methods
  • Visualisation of two approaches to demographic segmentation using one and two variables. On the left, a single variable (age) is used. On the right, two variables (income and occupation) are used to form the segments.
  • Types of Market Segmentation: Ad-Hoc, Syndicated, and Feral
  • Perceptual map of the U.S. motor vehicle category
  • The STP approach highlights the three areas of decision-making
  • To estimate market size, a marketer might evaluate the adoption and growth rates of comparable technologies (historical analogy method).
PROCESS OF DIVIDING A BROAD CONSUMER MARKET INTO SUB-GROUPS WITH SHARED CHARACTERISTICS
Market Segmentation; Market segments; Rate fence; Segmenting; Customer segmentation; Marget segmentation; Market segment; Customer segment; Horizontal segmentation
In marketing, market segmentation is the process of dividing a broad consumer or business market, normally consisting of existing and potential customers, into sub-groups of consumers (known as segments) based on some type of shared characteristics.

ويكيبيديا

Segmentation and reassembly

Segmentation and reassembly (SAR) is the process used to fragment and reassemble variable length packets into fixed length cells so as to allow them to be transported across Asynchronous Transfer Mode (ATM) networks or other cell based infrastructures. Since ATM's payload is only 48 bytes, nearly every packet from any other protocol has to be processed in this way. Thus, it is an essential process for any ATM node. It is usually handled by a dedicated chip, called the SAR.

The process is conceptually simple: an incoming packet from another protocol to be transmitted across the ATM network is chopped up into segments that fit into 48-byte chunks carried as ATM cell payloads. At the far end, these chunks are fitted back together to reconstitute the original packet.

The process is analogous to the fragmentation of IP packets on reaching an interface with a maximum transmission unit (MTU) less than the packet size and the subsequent reassembly of the original packet once the fragments have reached the original packet's destination.

Since different types of data are encapsulated in different ways, the details of the segmentation process vary according to the type of data being handled. There are several different schemes, referred to as ATM adaptation layers (AAL). The schemes are:

  • AAL0 – Raw cells with no special format
  • AAL1 – Constant bitrate, circuit emulation (T1, E1, etc.)
  • AAL2 – Variable bitrate synchronous traffic, eous traffic, e.g. Frame Relay transport
  • AAL5 – Used for most data traffic, such as IP