Datasheet

TLK110

SLLS901D –DECEMBER 2011–REVISED JANUARY 2014

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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 TLK110 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 (SWSCR1). 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.

3.12.2 ALCD

The TLK110 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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