FAQs

Q: What is the ProCurve zl External Power Supply Shelf?
The ProCurve zl Power Supply Shelf is for those customers who may want full PoE power with higher port density than that provided by the internal power supplies or those that desire redundant power for their zl series switch PoE environments. It functions as an EPS (external power supply) only. There are 2 power supply slots in the ProCurve zl Power Supply shelf, allowing for connection of up to 2 J8712A (875 W) or J8713A (1500 W) ProCurve zl power supplies.

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Q: What is the difference between redundant and external power delivery? Which type of power does the ProCurve zl Power Supply Shelf provide?
Redundant power provides a backup power source for switch operation. It can allow a switch to remain powered if the AC cord is pulled or if a switch's internal power supply fails.

External power provides a power source or power supplement to Power over Ethernet (PoE) capable devices connected to ProCurve PoE switches.

The zl power supply shelf is used for the purpose of adding extra or backup 50V (PoE power). The zl Power Supply Shelf will not supply any 12V (redundant system power) to a zl series switch. Redundant switch (system) power is provided through the addition of power supplies to the switch chassis slots.

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Q: How much PoE power can the ProCurve zl Power Supply Shelf provide?
The amount of PoE power available for delivery through the ports of the zl switch series depends on the quantity and type of power supply installed in the shelf. The zl Power Supply Shelf can support 1 or 2 zl power supplies. For product and available PoE power, please see question 5.

To determine your PoE needs, please consult the ProCurve PoE Planning and Implementation Guide.

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Q: How many switches can the zl Power Supply Shelf provide power for simultaneously?
The zl Power Supply Shelf has two external power supply ports. You can connect one or two ProCurve PoE capable switches to provide PoE power as a primary or backup source. Each power slot operates independently, providing external power to the switch connected to the corresponding EPS cable.

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Q: Can the supported zl power supplies be mixed (one of each type) in a single zl Power Supply Shelf?
Yes. Though installing two different power supplies in the same chassis is a supported configuration, it is strongly discouraged, particularly if some level of PoE power redundancy is wanted, since the amount of PoE power available on power supply loss may not be intuitive.

For example, if full PoE power redundancy is wanted using 875 W and 1500 W power supplies, the 1500 W supply should be held in reserve. This would mean that only 273 W of PoE power should be used normally. While it is tempting to add the two supplies and divide by two (using 585 W and keeping 585 W in reserve), if power is lost from one supply, the full 900 W of the 1500 W supply may be missing, with only the 273 W of the 875 W supply available. This is obviously not enough to keep the 585 W of the normal environment up and running. Thus there is no redundancy for some of the powered devices in this scenario, even though that was desired. This is not a concern if all supplies in the switch are the same power.

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Q: Can the EPS cables be hot swapped?
No. The EPS cables should be securely connected and the thumb screws tightened prior to powering up the power supplies installed in the ProCurve sl Power Supply Shelf. Disconnecting the EPS (PoE power) cable with power flowing is not supported, and could cause loss of PoE power to all network devices connected to the switch. The Power Supply Shelf must be powered down before disconnecting the EPS (PoE power) cable, if power is flowing. Only the power supply to be disconnected must be powered down.

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Q: How long are the EPS cables that connect the zl Power Supply Shelf to the switch(es) for which it is providing external power?
The EPS cables (part number 5070-0102) are 2.0 meters (6.56 feet) in length.

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Q: How does the zl Power Supply Shelf turn on?
The Power Supply Shelf does not come with power supplies installed. You must purchase power supplies separately and install them. The Power Supply Shelf does not have a power switch. They are powered on when the power cord is connected to the unit and to a power source.

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Q: What is a jumper cable and how is it used?
A jumper cable (also known as a jumper cord), provides a power interconnect between a LAN Switch and a power distribution device, such as a Power Distribution Unit (PDU) or an Uninterruptible Power Supply (UPS).

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Q: Does ProCurve Networking by HP have jumper cables for its LAN Switch products?
Yes, ProCurve Networking by HP does have jumper cables available for its LAN Switch products through the worldwide HP Parts Store at www.hp.com/buy/parts.

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Q: Why are ProCurve jumper cables required for use with a PDU or UPS?
The ProCurve Networking by HP jumper cables are designed to HP specifications to minimize defects in materials and workmanship. The jumper cables were developed specifically to meet the extended temperature specifications, 0°C to 55°C (32°F to 131°F) of ProCurve switches while complying with international laws.

Using jumper cables which do not meet ProCurve’s specifications could result in overheating of the jumper cables. Use the proper jumper cables listed for your ProCurve switches. Use of any other jumper cable is not supported by ProCurve.

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Q: What do the jumper cable connectors look like?
The following table displays the connectors for C14 to C15 jumper cables and C19 to C20 jumper cables.

The C15 or C19 connector inserts into the power inlet on the switch power supply, while the C14 or C20 connector inserts into the receptacle on a power distribution device, PDU or UPS.

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Q: What ProCurve products require a C14 to C15 or a C19 to C20 jumper cable to connect to a PDU or UPS?
The table below displays, by country, the jumper cable part number for a specific ProCurve product. The jumper cable required by a ProCurve 8200zl or 5400zl switch and a ProCurve Power Supply Shelf, depends on the wattage of the power supply in the ProCurve product(875 W (J8712) or 1500 W (J8713)). Jumper cables are available in two lengths, 1 meter and 2.5 meters.

Country	Length (meters)	ProCurve Switch 3500yl/6200yl 3	ProCurve Switch 8200zl/5400zl and Power Supply Shelf			ProCurve 620 Red/Ext Power Supply 2
			875 W Supply 3		1500 W Supply 2
Australia/ New Zealand	1 m 2.5 m	8121-1093 1 8121-1094 1			8121-1089 8121-1090
China	1 m 2.5 m	8121-1093 1 8121-1094 1			8121-1089 8121-1090
Continental Europe	1 m 2.5 m	8121-1093 1 8121-1094 1			8121-1089 8121-1090
Denmark	1 m 2.5 m	8121-1093 1 8121-1094 1			8121-1089 8121-1090
Israel	1 m 2.5 m	8121-1093 1 8121-1094 1			8121-1089 8121-1090
Japan	1 m 2.5 m	8121-1092    8121-1091			8121-1089 8121-1090
South Africa/ India	1 m 2.5 m	8121-1093 1 8121-1094 1			8121-1089 8121-1090
Switzerland	1 m 2.5 m	8121-1093 1 8121-1094 1			8121-1089 8121-1090
Taiwan	1 m 2.5 m	8121-1092    8121-1091			8121-1089 8121-1090
Thailand	1 m 2.5 m	8121-1093 1 8121-1094 1			8121-1089 8121-1090
U.K.	1 m 2.5 m	8121-1093 1 8121-1094 1			8121-1089 8121-1090
Hong Kong/ Singapore	1 m 2.5 m	8121-1093 1 8121-1094 1			8121-1089 8121-1090
U.S./Canada/ Mexico	1 m 2.5 m	8121-1092    8121-1091			8121-1089 8121-1090

¹ – Availability of 8121-1093 and 8121-1094 jumper cables planned for May 2008
² – C19 to C20 cable: The C19 connector connects into the power inlet on the switch’s power supply, while the C20 connector connects into the receptacle on a power distribution unit.
³ – C14 to C15 cable: The C15 connector connects into the power inlet on the switch’s power supply, while the C14 connector connects into the receptacle on a power distribution unit.

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Q: What are the technical specifications for the C14 to C15 and C19 to C20 jumper cables?
The table below contains the technical specifications for the C14 to C15 and C19 to C20 jumper cables.

¹ – Rating of 20 A at 240 V in U.S. and Canada
² – Rating of 16 A at 240 V in Japan, Taiwan, Australia/New Zealand, China, Continental Europe, Denmark, Israel, South Africa/India, Switzerland, Thailand, U.K., and Hong Kong/Singapore

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Q: How does a customer purchase the C14 to C15 or C19 to C20 jumper cables?
The C14 to C15 jumper cables or C19 to C20 jumper cables are orderable through the HP Parts Store at www.hp.com/buy/parts. The C14 to C15 jumper cables, 8121-1093 and 8121-1094 are currently undergoing development and regulatory testing and will be available in May 2008.

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