Question:

I have come across an unused HP power supply unit, model HP J9739A, and I am seeking expert advice to understand its specifications better. The input rating is 110V-240V ~ 50-60 Hz 12-7A, and the output ratings are V_POE: +52V to 57V at 20-0A and V_SB: +12V at 2.5A MAX, with a maximum power of 1050W. Could you please guide me to a resource or website where I can learn more about these specifications and possibly find a suitable application for this power supply?

Thank you.

Answer:

When you come across a power supply unit (PSU) like the HP J9739A, it’s essential to grasp its specifications to determine its potential applications. This particular model is a modular power supply designed for non-Power over Ethernet (PoE) capable switches, specifically the HP 2920 Series Switches.

The input rating of

110V-240V ~ 50-60 Hz 12-7A

indicates that the PSU can operate with an input voltage range from 110 to 240 volts, which covers standard voltages for most countries, and it can handle an input current of 12 to 7 amperes. This flexibility allows it to be used in various settings without the need for voltage converters.

Output Ratings:

The output ratings are listed as

V_POE: +52V to 57V at 20-0A and V_SB: +12V at 2.5A MAX. These figures tell us that the PSU can provide a Power over Ethernet (PoE) output voltage between 52 and 57 volts, with a current range from 20 to 0 amperes, and a standby voltage (V_SB) of 12 volts with a maximum current of 2.5 amperes. The 1050W MAX

power indicates the maximum wattage the PSU can deliver.

Potential Applications:

The HP J9739A is suitable for powering HP 2920 Series Switches that do not require PoE+ capabilities. It’s a spare accessory that ensures your network switches operate efficiently without the need for PoE+ features, which are typically used to power devices like IP cameras and wireless access points through the Ethernet cable.

Finding More Information:

For more detailed information about the HP J9739A PSU, you can visit the official HP support page or the product page on the HP website. These resources will provide you with comprehensive technical specifications, compatibility details, and support documents to help you understand how to integrate this PSU with your existing network infrastructure.

In summary, the HP J9739A is a robust and versatile PSU that can be a valuable component in a non-PoE network environment. Its broad input voltage range and substantial power output make it a reliable choice for ensuring the smooth operation of compatible network switches.

—

This article format provides a clear and concise answer to the question, offering both an explanation of the PSU’s specifications and guidance on where to find more information. It’s tailored to someone seeking expert advice and aims to demystify the technical details while pointing to resources for further exploration.