LAN8740A Datasheet, PDF (49/136 Pages) Microchip Technology – Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology

LAN8740A/LAN8740Ai
The typical cable length measurement margin of error for Open and Shorted cases is dependent on the selected cable
type and the distance of the open/short from the device. Table 3-10 and Table 3-11 detail the typical measurement error
for Open and Shorted cases, respectively.
TABLE 3-10: TYPICAL MEASUREMENT ERROR FOR OPEN 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
P_OPEN = Unknown
9
5
13
14
8
20
Selected Propagation Constant
P_OPEN = CAT 6
6
P_OPEN = CAT 5E
5
6
6
P_OPEN = CAT 5
3
6
TABLE 3-11: TYPICAL MEASUREMENT ERROR FOR SHORTED CABLE (+/- METERS)
Physical Distance to
Fault
P_SHORT = Unknown
CAT 6 Cable,
8
0-100 m
CAT 5E Cable,
5
0-100 m
CAT 5 Cable,
11
0-100 m
CAT 6 Cable,
14
101-160 m
CAT 5E Cable,
7
101-160 m
CAT 5 Cable,
11
101-160 m
Selected Propagation Constant
P_SHORT =
CAT 6
5
P_SHORT =
CAT 5E
5
6
6
P_SHORT =
CAT 5
2
3
 2013-2015 Microchip Technology Inc.
DS00001987A-page 49