TLK105 Datasheet, PDF (16/99 Pages) Texas Instruments – Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer Transceiver

TLK105
TLK106
SLLSEB8A – AUGUST 2012 – REVISED MARCH 2013
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For all TDR measurements, the transformation between time of arrival and physical distance is done by
the external host using minor computations (such as multiplication, addition and lookup tables). The host
must know the expected propagation delay of the cable, which depends, among other things, on the cable
category (for example, CAT5, CAT5e, or CAT6).
TDR measurement is allowed in the TLK106 in the following scenarios:
• While Link partner is disconnected – cable is unplugged at the other side
• Link partner is connected but remains “quiet” (for example, in power down mode)
• TDR could be automatically activated when the link fails or is dropped by setting bit 8 of register
0x0009 (CR1). The results of the TDR run after the link fails will be saved in the TDR registers. The
SW could read these registers at any time to apply post processing on the TDR results. This mode is
designed for cases in which the link dropped due to cable disconnections, in which after link failure, the
line will be quiet to allow a proper function of the TDR.
3.11.2 ALCD
The TLK106 also supports Active Link Cable Diagnostic (ALCD). The ALCD offers a passive method to
estimate the cable length during active link. The ALCD uses passive digital signal processing based on
adapted data, thus enabling measurement of cable length with an active link partner.
The ALCD Cable length measurement accuracy is ±5m for the pair used in the Rx path (due to the
passive nature of the test, only the receive path is measured).
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Hardware Configuration
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