Switching

Hi All, I wanted to get some clarification around the EX4200 PSU’s.
Firstly, what is the difference (including physical dimensions) between the following parts:

EX-PWR-930-AC 930 W AC Power Supply Unit (PSU)
EX-PWR2-930-AC 930 W PoE+ AC Power Supply Unit (PSU)

Obviously the EX-PWR2-930-AC says it supports PoE+, but I thought the EX4200 gained the ability to use PoE+ via the upgrade to JUNOS 11.1, not by changing the PSU. The wattage appears to be the same.

Additionally, I can’t choose the EX-PWR2-930-AC part in the Juniper Partner Center - Channel Configurator Tool. Only the EX-PWR-930-AC is available.

Cheers,

hi,

the EX documentations seems to be clear here:

• EX4200-24PX and EX4200-48PX support PoE+ (IEEE 802.3at - up to 30W per port) and require EX-PWR2-930-AC
• EX-PWR2-930-AC is supported in all EX4200 models

http://www.juniper.net/techpubs/en_US/release-independent/junos/topics/reference/specifications/power-supply-ex4200.html

Some relevant excerpts:

EX4200-24PX and EX4200-48PX switches do not support the 930 W (EX-PWR-930-AC) or the 600 W (EX-PWR-600-AC) AC power supplies that are used in the EX4200-48P and the EX4200-24P switch models. EX4200-24PX and EX4200-48PX switches work only with the power supply labeled EX-PWR2-930-AC. You can find the label on the top of the power supply (see Removing a Power Supply from an EX4200 Switch). The EX-PWR2-930-AC power supply is supported across the EX4200 product line

The PoE power budget for a PoE switch model is determined by the capacity of its power supply. For EX4200 switches, the capacity of the power supply provided with a PoE model is sufficient to supply each PoE-capable port with up to 15.4 W in compliance with the IEEE 802.3af PoE standard.

Starting with Junos OS Release 11.1, EX4200 switches support enhanced PoE, a Juniper Networks extension to the IEEE 302.3af PoE standard. Enhanced PoE permits up to 18.6 W per PoE port. Because the power supply provided with a switch is designed to supply a maximum of 15.4 W per PoE port, if you connect a powered device that draws more than 15.4 W, the PoE power budget might not be sufficient to supply a full 15.4 W to the remaining PoE ports.

EX4200-24PX and EX4200-48PX switches support PoE+, the IEEE 802.3at PoE standard, and permit up to 30 W per port.

jtb

Thanks jtb, I wrongly assumed that Enhanced PoE was 802.3at

This link gives a good overview of PoE in the EX Series:

http://www.juniper.net/techpubs/en_US/junos11.3/topics/concept/poe-overview.html

Can you have an EX-4200-48P with an EX-PWR2-930-AC and EX-PWR-930-AC installed at the same time?  I only ask because of stock issues.

Thanks!

Can we use EX-PWR-930-AC (as redundant power supply) for EX4200-48P? (Y / N)

Can we use EX-PWR-930-AC (as redundant power supply) for EX4200-48T? (Y / N)