3 configuring an fe-100tx in port 25 or 26, 4 setting the fe-100tx operational mode, 1 configuring an fe-100fx or fe-100f3 – Cabletron Systems 2E43-27R User Manual
Page 103: In port 25 or 26 -51, 2 setting the fe-100fx or fe-100f3, Operational mode -51, Installed, Section 5.15.1, Describes ho, Setup is required

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