HP ProCurve J8162A Supplementary Manual page 14

Using 5300xl Features with the Access Controller xl Module
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The ACM does not support any routing infrastructure attached to a downlink
client port. Figure 3 below shows how an ACM can be used to communicate
with a lower-level, non-routed network structure through a downlink client
port.
Figure 3. A Downlink Client Port with a Non-Routed Network Structure