Chipset eases transition to standard 90W PoE

October 23, 2019 //By Nick Flaherty
Chipset eases transition to standard 90W PoE
Microchip is enabling both pre-standard and IEEE-compliant Powered Devices (PDs) to receive up to 90W of power without changing Power over Ethernet (PoE) switches or cabling.

The devices ease the transition to using IEEE 802.3bt-2018-compliant PoE injectors and midspans for users, and Power Sourcing Equipment (PSE) chipsets for system developers.

As the industry adopts the latest generation of PoE technology for managing data and power over a single Ethernet cable, users face the challenge of making pre-standard PDs work with new IEEE 802.3bt-2018-compliant PDs without changing PoE switches or cabling.

Many proprietary solutions were brought to market through 2018 and support specifications such as Universal PoE (UPOE) and Power over HDBaseT (PoH). They meet the higher powering needs of two-pair and four-pair PDs including kiosks, POS terminals, thin clients, 802.11ac/ax access points, small cells, smart buildings, industrial automation systems and connected LED lighting. During this period Microchip has offered a PSE chipset for implementing the widely adopted PoH four-pair power standard for 95W PDs. It is now the first to also offer an IEEE 802.3af/at/bt chipset that enables pre-standard switches to interoperate with new IEEE 802.3bt-2018-compliant products. 

The PoE injectors and midspans allow users to power any combination of pre-standard and IEEE 802.3bt-2018-compliant PDs by installing the single- or multi-port solutions between PDs and their existing switch. The family includes single- and multi-port options that will also enable new IEEE 802.3bt-compliant switches to power pre-standard PDs.

The PSE chipset design balances thermal dissipation more evenly across the system while enabling scalability for supporting two-pair and four-pair systems with a single board design. It provides all required manager and controller functionality for building power sourcing equipment with the industry’s most extensive interoperability and can source 90 to 99.9 watts of power per port while supporting up to 48 ports for IEEE 802.3bt Type 3 (Classes 1-6) and Type 4 (Classes 7-8) applications.

Earlier pre-standard PSE designs based on Microchip’s Gen 6 PSE chipset can be upgraded to IEEE 802.3bt via a software update with no hardware changes.


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