5.4.1. /
ATM - AAL, , ATM , , 4 . AAL, ATM ATM , .6-6 ( ).
.6-6. ATM
(Payload) CS AAL, , . SR AAL ( 44-47 ) 48- - (PDU), - ( 1-2 ), ( 0-2 ). . ATM 48 -
() 5 . 53- . , , , , SDH, ATM , ATM. - :
→ → → AAL→ .
, , .
1. ATM , .. AAL, , (, PDU ). ATM.
2. ATM, ATM- ( ATM, UNI), (NNI-NNI) UNI, , .
, OSI: - (SAP), , PDU. ( ), - ( PDU) - ( PDU), . PDU (SDU), PDU, ('). PDU () (, CS-PDU).
ATM :
Payload→AAL-SAP→AAL-SDU→CS-PDU→SAR-PDU→ATM-SAP→ATM-SDU→ATM-PDU→
, CS SAR (SAP) .