May 2024
Intermediate to advanced
309 pages
13h 33m
English
Content preview from Data Communications and Computer Networks by Pearson
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Ethernet, Virtual Circuit Networks and SONET 189
AAL3/4
Originally, AAL3 and AAL4 were dened separately to support connection-oriented and connectionless
services, respectively. However, later they were combined to form a single format AAL3/4. Thus, it supports
both connection-oriented and connectionless services. Here, the CS sublayer forms a PDU by inserting a
header at the beginning of a frame or appending a trailer. It passes the PDU to SAR sublayer, which partitions
the PDU into segments and adds a 2-byte header to each segment. It also adds a trailer to each segment.
The header and trailer added by the CS layer together consist ...
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