SwitchBlade x8106 Chassis Switch Installation Guide

PDs that comply with the IEEE 802.3af and 802.3at standards typically support both power delivery methods. However, some legacy PDs support only one power delivery method. Legacy devices that only support Alternative B will not work with the AT-SBx81GP24 PoE Line Card. Legacy devices are nodes manufactured before the IEEE 802.3af and 802.3at standards were completed and, consequently, may not adhere to the standards.

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Allied Telesis X8106 manual SwitchBlade x8106 Chassis Switch Installation Guide