TLK100_11 Datasheet, PDF (20/88 Pages) Texas Instruments – Industrial Temp, Single Port 10/100 Mb/s Ethernet Physical Layer Transceiver

TLK100
SLLS931B – AUGUST 2009 – REVISED DECEMBER 2009
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3.7.2 ALCD
The TLK100 also supports Active Link Cable Diagnostic (ALCD). The ALCD offers a passive method to
estimate the cable length during active link. It uses passive digital signal processing based on adapted
data thus enabling measurement of cable length with an active link partner.
The ALCD also uses pre-defined parameters according to the cable properties (e.g. CAT5/CAT5e/CAT6)
in order to achieve higher accuracy in the estimated cable length. The ALCD Cable length measurement
accuracy is +/-5m for the pair used in the Rx path (due to the passive nature of the test we measure only
the pair on the Rx path).
3.7.3 DSA
The TLK100 also offers a unique capability of Digital Spectrum Analyzer (DSA). The DSA enables a
detailed analysis of the channel frequency response (Magnitude only). The DSA has the following
capabilities:
• Produce channel frequency response in resolution of 119.2Hz.
• Save up to 512 bins per DSA run.
• Full control in the analyzed frequency bins location and resolution.
• Programmable options for input data for the DSA:
– Use raw data taken directly from the channel
– Use adapted data that passed digital signal processing
• Use additional filtering for smoothing the total channel frequency response.
• Build in averaging for more accurate results
NOTE: For an example of the DSA output please see appendix A
To reset the cable diagnostic registers, set bit 14 of RAMCR2 register (0x0D01) to '1'. Writing software
global reset 0x001F bit 15 does not reset the cable diagnostic registers.
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Configuration
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