Motorola PowerQUICC II MPC8280 Series Reference Manual page 1044

OAM Support
31.6.1 ATM-Layer OAM Definitions
Table 31-8 lists pre-assigned header values at the user-network interface (UNI).
Table 31-8. Pre-Assigned Header Values at the UNI
Use
Segment OAM F4 flow cell
End-to-end OAM F4 flow cell
Segment OAM F5 flow cell
End-to-end OAM F5 flow cell
a = available for use by the appropriate ATM layer function
Table 31-9 lists pre-assigned header values at the network-node interface (NNI).
Table 31-9. Pre-Assigned Header Values at the NNI
Use
Segment OAM F4 flow cell
End-to-end OAM F4 flow cell
Segment OAM F5 flow cell
End-to-end OAM F5 flow cell
a= available for use by the appropriate ATM layer function
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:
31-30
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GFC VPI
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VPI
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VCI
0000_0000_0000_0011
0000_0000_0000_0100
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VCI
0000_0000_0000_0011
0000_0000_0000_0100
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PTI CLP
0a0 a
0a0 a
100 a
101 a
PTI CLP
0a0 a
0a0 a
100 a
101 a
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