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Zakładka z wyszukiwarką danych komponentów |
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LT4295 Arkusz danych(PDF) 29 Page - Analog Devices |
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LT4295 Arkusz danych(HTML) 29 Page - Analog Devices |
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29 / 50 page  LTC9101-1/ LTC9102/LTC9103 29 Rev. 0 For more information www.analog.com APPLICATIONS INFORMATION 9101123 F20 VCLASSMIN VMARKMAX VSIGMIN VRESET DETECT 1ST CLASS 1ST MARK 2ND MARK 3RD MARK 4TH MARK 2ND CLASS 3RD CLASS 4TH CLASS POWER ON Figure 20. Type 3 or 4 PSE, 4-Event Class Sequence 9101123 F21 VCLASSMIN VMARKMAX VSIGMIN VRESET DETECT 1ST CLASS 1ST MARK 2ND MARK 3RD MARK 4TH MARK 5TH MARK 2ND CLASS 3RD CLASS 4TH CLASS 5TH CLASS POWER ON Figure 21. Type 4 PSE, 5-Event Class Sequence 9101123 F18 VCLASSMIN VMARKMAX VSIGMIN VRESET DETECT 1ST CLASS 1ST MARK POWER ON Figure 18. Type 3 or 4 PSE, 1-Event Class Sequence 9101123 F19 VCLASSMIN VMARKMAX VSIGMIN VRESET DETECT 1ST CLASS 1ST MARK 2ND MARK 3RD MARK 2ND CLASS 3RD CLASS POWER ON Figure 19. Type 3 or 4 PSE, 3-Event Class Sequence Understanding 4PID 4-pair identification (4PID) refers to a set of conditions for determining whether a PD is capable of receiving power over both pairsets simultaneously. The PSE may apply 4-pair power if the PD presents a valid detection signature on both pairsets and one or more of the following conditions are met: • The port is in 4-pair mode. • The PD is single-signature configuration. • The PD is Type 3 or Type 4. • The PD presents a valid detection signature on an unpowered pairset when power is applied over the other pairset. Although PD signature configuration is not defined for Type 1 and Type 2 PDs, a Type 3 or Type 4 PSE may identify such a PD as single-signature or dual-signature. Single-signature PDs may receive 4-pair power regardless of PD Type. Certain pre-802.3bt “dual-signature” PDs may be damaged by 4-pair power. Type 3 and Type 4 dual-signature PDs are required to present a unique classification response from pre-802.3bt dual-signature PDs of the same Class. For dual-signature PDs, the LTC9101-1/LTC9102/LTC9103 determines and reports both PD Class and PD Type during classification. Type 3, Type 4, and pre-802.3bt Class 1 through Class 4 dual-signature PDs present class signature 1 through 4, respectively, during the first and second class events. Type 3 and Type 4 dual-signature PDs present class sig- nature 0 for all subsequent class events. Thus, a PSE can conclusively determine PD Type by the third class event for all dual-signature PDs. |
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