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MPC8280 데이터시트(PDF) 1107 Page - Freescale Semiconductor, Inc

부품명 MPC8280
상세설명  PowerQUICC??II Family Reference Manual
PDF  1386 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

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MPC8280 PowerQUICC II Family Reference Manual, Rev. 1
Freescale Semiconductor
33-1
Chapter 33
ATM AAL2
NOTE
The functionality described in this chapter is not available on the MPC8270.
Refer to www.freescale.com for the latest RAM microcode packages that
support enhancements.
The microcode implementation of the ATM adaptation layer type 2 (AAL2) on the MPC8280 is compliant
with the ITU-T recommendations I.363.2 and I.366.1. This chapter describes the functionality and data
structures of AAL2 CPS, CPS switching, and SSSAR and should be used as a supplement to Chapter 31,
“ATM Controller and AAL0, AAL1, and AAL5.”
33.1
Introduction
AAL2 enables the multiplexing of voice and data channels over a single ATM VC. The channels consist
of packets transported within individual ATM cells (see Figure 33-1). Packet lengths are allowed to vary
in order to accommodate bandwidth fluctuations of the individual channels. Each packet has a channel
identifier (CID) so that each AAL2 user (channel) is uniquely identified by the triplet VP | VC | CID.
Figure 33-1. AAL2 Data Units
ATM header
STF
ATM cell
PH
PP
PH
PP
Padding
STF
CPS PDU
PH
PP
PH
PP
Padding
PH
PP
PH
PP
SSSAR SDU
SSSAR
CPS
ATM
SSSAR PDU



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