February 2013
Intermediate to advanced
480 pages
13h 35m
English
Content preview from Power Over Ethernet Interoperability GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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LLDP or Physical-Layer Classification for Type 2 PSEs?
We have learned that a Type 2 PSE can support either 2-event L1 classification (no data link required—good for Midspans and Endspans) or 1-event L1, followed by L2 classification (good only for Endspans). See also Fig. 4.1. Colloquially, we just say a Type 2 PSE can do either physical layer classification or LLDP-based classification. What we actually mean should, however, be clear by now. It is actually 2-event, or 1-event + LLDP.
So now we ask: Which is better (obviously from the viewpoint of Endspans)? We will discuss this once more at the end of this chapter too.
For the purpose of mutual identification between Type 2 devices, the first method (Type 2 classification completed at layer-2), ...
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