MPC8280 datasheet(988/1386 Pages) FREESCALE

988 / 1386 page

ATM Controller and AAL0, AAL1, and AAL5

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

31-28

Freescale Semiconductor

Table 31-9 lists pre-assigned header values at the network-node interface (NNI).

31.6.2

Virtual Path (F4) Flow Mechanism

The F4 flow is designated by pre-assigned virtual channel identifiers within the virtual path. The following

two kinds of F4 flows can exist simultaneously:

•

End-to-end (identified as VCI 4)—This flow is used for end-to-end VPC operations

communications. Cells inserted into this flow can be removed only by the endpoints of the virtual

path.

•

Segment (identified as VCI 3)—This flow is used for communicating operations information

within one VPC link or among multiple interconnected VPC links. The concatenation of VPC links

is called a VPC segment. Cells inserted into this flow can be removed only by the segment

endpoints, which must remove these cells to prevent confusion in adjacent segments.

31.6.3

Virtual Channel (F5) Flow Mechanism

The F5 flow is designated by pre-assigned payload type identifiers. The following two kinds of F5 flow

can exist simultaneously:

•

End-to-end (identified by PTI = 5)—This flow is used for end-to-end VCC operations

communications. Cells inserted into this flow can be removed only by VC endpoints.

•

Segment (identified by PTI = 4)—This flow is used for communicating operations information

with the bound of one VCC link or multiple interconnected VCC links. A concatenation of VCC

links is called a VCC segment. Segment endpoints must remove these cells to prevent confusion

in adjacent segments.

31.6.4

Receiving OAM F4 or F5 Cells

OAM F4/F5 flow cells are received using the raw cell queue, described in Section 31.4.4, “Receive Raw

Cell Queue.” An F4/F5 OAM cell which does not appear in the CAM or address compression tables is

considered a misinserted cell.

31.6.5

Transmitting OAM F4 or F5 Cells

OAM F4/F5 flow cells are sent using the usual AAL0 transmit flow. For OAM F4/F5 cell transmission,

program channel one in the TCT to operate in AAL0 mode. Enable the CR10 (CRC-10 insertion) mode as

Table 31-9. Pre-Assigned Header Values at the NNI

Use

VPI

VCI

PTI

CLP

Segment OAM F4 flow cell

aaaa_aaaa_aaaa

0000_0000_0000_0011

0a0

End-to-end OAM F4 flow cell

aaaa_aaaa_aaaa

0000_0000_0000_0100

0a0

Segment OAM F5 flow cell

aaaa_aaaa_aaaa

aaaa_aaaa_aaaa_aaaa

100

End-to-end OAM F5 flow cell

aaaa_aaaa_aaaa

aaaa_aaaa_aaaa_aaaa

101

a= available for use by the appropriate ATM layer function

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