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AAL 2 operation (cont.)

H

H

ATM cell N

ATM cell N+1

Start field (1 byte)

pad

CPS packet

(CPS = Common Part Sub-layer)

H

Payload

8

6

5

5

CPS packet header

• CID field (uniquely identifies user source)

• Length indicator (length of CPS packet)

• UUI field (service specific information)

• HEC (error check of CPS packet header only)