LAN9353 Datasheet, PDF (116/523 Pages) Microchip Technology – Interfaces at up to 200Mbps via Turbo MII

LAN9353
TABLE 9-7: TYPICAL MEASUREMENT ERROR FOR OPEN CABLE (+/- METERS)
CAT 5 Cable, 0-100 m
13
3
CAT 6 Cable, 101-160 m
14
6
CAT 5E Cable, 101-160 m
8
6
CAT 5 Cable, 101-160 m
20
6
TABLE 9-8: TYPICAL MEASUREMENT ERROR FOR SHORTED CABLE (+/- METERS)
PHYSICAL DISTANCE
TO FAULT
CAT 6 Cable, 0-100 m
CAT 5E Cable, 0-100 m
CAT 5 Cable, 0-100 m
CAT 6 Cable, 101-160 m
CAT 5E Cable, 101-160 m
CAT 5 Cable, 101-160 m
SELECTED PROPAGATION CONSTANT
P_SHORT =
Unknown
P_SHORT =
CAT 6
P_SHORT =
CAT 5E
P_SHORT =
CAT 5
8
5
5
5
11
2
14
6
7
6
11
3
9.2.15.2 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 9-9. 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 9-9: MATCH CASE ESTIMATED CABLE LENGTH (CBLN) LOOKUP
CBLN Field Value
0-3
4
5
6
7
8
9
10
11
Estimated Cable Length
0
6
17
27
38
49
59
70
81
DS00001925A-page 116
 2015 Microchip Technology Inc.