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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LAN9252V/ML датащи(PDF) 139 Page - Microchip Technology |
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LAN9252V/ML датащи(HTML) 139 Page - Microchip Technology |
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139 / 329 page  2015 Microchip Technology Inc. DS00001909A-page 139 LAN9252 11.2.12.2 Matched Cable Diagnostics Matched cable diagnostics enable cable length estimation on 100 Mbps-linked cables of up to 120 meters. If there is an active 100 Mb link, the approximate distance to the link partner can be estimated using the PHY x Cable Length Register (PHY_CABLE_LEN_x). If the cable is properly terminated, but there is no active 100 Mb link (the link partner is disabled, nonfunctional, the link is at 10 Mb, etc.), the cable length cannot be estimated and the PHY x Cable Length Register (PHY_CABLE_LEN_x) should be ignored. The estimated distance to the link partner can be determined via the Cable Length (CBLN) field of the PHY x Cable Length Register (PHY_CABLE_LEN_x) using the lookup table provided in Table 11-8. The typical cable length measurement margin of error for a matched cable case is +/- 20 m. The matched cable length margin of error is consistent for all cable types from 0 to 120 m. TABLE 11-7: TYPICAL MEASUREMENT ERROR FOR SHORTED CABLE (+/- METERS) PHYSICAL DISTANCE TO FAULT SELECTED PROPAGATION CONSTANT PSHORT = Unknown PSHORT = CAT 6 PSHORT = CAT 5E PSHORT = CAT 5 CAT 6 Cable, 0-100 m 85 CAT 5E Cable, 0-100 m 5 5 CAT 5 Cable, 0-100 m 11 2 CAT 6 Cable, 101-160 m 14 6 CAT 5E Cable, 101-160 m 7 6 CAT 5 Cable, 101-160 m 11 3 TABLE 11-8: MATCH CASE ESTIMATED CABLE LENGTH (CBLN) LOOKUP CBLN Field Value Estimated Cable Length 0 - 3 0 46 517 627 738 849 959 10 70 11 81 12 91 13 102 14 113 15 123 |
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