L-ET1011C2-CI-D LSI, L-ET1011C2-CI-D Datasheet - Page 36

• Manufacturer Part Number: L-ET1011C2-CI-D
• Manufacturer: LSI

Specifications of L-ET1011C2-CI-D

• Number Of Receivers: 1
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Lead Free Status / Rohs Status: Compliant

Gigabit Ethernet Transceiver
Cable Diagnostics
The ET1011C has on-chip cable diagnostics. The cable analysis uses two distinct methods for evaluating the cable: link analy-
sis and time domain reflectometry (TDR) analysis. This analysis can be used to detect cable impairments that may be prevent-
ing a gigabit link or affecting performance.
When there is a link active, the link analysis can detect cable length, link quality, pair skew, pair swaps (MDI/MDI-X configu-
ration), and polarity reversal. When there is no link, TDR can detect cable faults (open circuit, short circuit), distance to the
fault, pair fault is on, cable length, pair skew, and excessive crosstalk. Table 18 summarizes the specifications of the cable
diagnostic functions.
Table 18. Cable Diagnostic Functions
1. Pair swaps on C and D as well as pairs A and B are reported.
2. Polarity reversal in 100Base-TX is not detected because MLT-3 signaling is polarity insensitive.
3. If the magnitude of the peak reflection is greater than 15% of an open circuit.
36
Detection of Cable Fault on
Any Pair
Detect Polarity Reversal
Good Cable with Link
Good Cable Without Link
Pair Skew with Link
Pair Skew Without Link
Excessive Crosstalk
Feature
Cable open
Cable short
Indicate distance to
fault
Pair swaps
Indicate length
Indicate length
Detect excessive, >50
ns
Detect excessive, >50
ns
Cable quality or split
pairs
Description
—
10
—
—
—
—
—
—
—
—
±10 m
100
—
—
—
—
—
—
—
—
2
±10 m
1000
—
—
—
—
—
—
1
±5 m
Term
±2 m
—
—
—
—
3
3
Unterm
±2 m
±2 m
—
—
—
—
September 2007
LSI Corporation
Link Analysis
Link Analysis
Link Analysis
Link Analysis
Line Probing
Line Probing
Line Probing
Analysis
Probing
Line