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example of a duplex mode mismatch. A repeater (Unit 1), capable of operating
in half-duplex mode only, is connected to the 100Base-SX port on the media
converter, while a switch (Unit 2), capable of either half- or full-duplex mode,
is connected to the 100Base-TX port on the media converter.
Figure 3 Example of a Duplex Mode Mismatch
In attempting to auto-negotiate with Unit 1, the media converter will
determine that the repeater is capable of half-duplex only and will set the port
connected to the unit appropriately. In auto-negotiating with Unit 2, the
media converter will determine that the switch can manage full-duplex and
will set the port connected to the switch to full-duplex. The result is a duplex
mode mismatch, with one unit operating in half-duplex and the other unit
operating in full-duplex. You could resolve this duplex mode mismatch by
manually configuring Unit 2, if possible, so that the port connected to the
media converter is set to half-duplex.
External Power Adapter
An external AC/DC power adapter is provided with the media converter for
use on a desktop. The power adapter supplies 12 V DC to the media converter.
Allied Telesyn supplies an approved safety compliant AC power adapter for
the 120 V AC and 240 V AC versions with an unregulated output of 12 V DC
at 1 A. The power required for the media converter is 12 V DC, 500 mA
Unit 1
Unit 2
100Base-TX Repeater
Media Converter 100Base-TX Switch
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