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ATM Connections 7-19
ATM Connection Configuration
Figure 7-7 Meaning of VSVD and Flow Control External Segments
VS and VD shown below are for traffic flowing
in direction of arrow. For the other direction of traffic,
VS and VD are in the opposite direction.
External segment Network segment External segment
1
2
3
4
5
5
ABR with ForeSight
VS ABR standard VD
VS ABR standard VD
ABR with ForeSight
VS ABR VD
VS ABR VD
VS ABR VD
VS ABR VD
ABR standard without VSVD
(without congestion flow control performed by network segment)
ABR Standard
VSVD
No
2
No
Yes
1
ABR with ForeSight
No
Yes
Yes
Flow control
external
segment
4
Flow control
external
segment
3
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