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Jack PC Hardware User Manual - Training Department
Version 0506
powered ports in a rack, the maximum capacity would not reach 240 x 15.4W = 3696W due to
power supply and heat dissipation problems. To better manage actual power as opposed to
standard maximum power, Cisco came up with intelligent power management features.
For example, the Catalyst 4500/6500 series switch has three PoE modes:
• Auto PoE interface. The supervisor engine directs the switching module to power up
the interface only if the switching module discovers the PD and the switch has
enough power. You can specify the maximum wattage that is allowed on the
interface. If you do not specify the wattage, then the switch will deliver no more than
the hardware-supported maximum value.
• Static - High priority PoE interface. The supervisor engine pre-allocates power to
the interface, even when nothing is connected, guaranteeing that there will be power
for the interface. You can specify the maximum wattage that is allowed on the
interface. If you do not specify the wattage, then the switch pre-allocates the
hardware-supported maximum value. If the switch does not have enough power for
the allocation, the command will fail. The supervisor engine directs the switching
module to power up the interface only if the switching module discovers the powered
device.
• Never - Data interface only. The supervisor engine never powers up the interface,
even if an unpowered phone is connected. This mode is only needed when you want
to make sure power is never applied to a PoE-capable interface.
To properly operate Jack-PCs you should either:
• Use Static mode and allocate 10,000 mW of power per Jack-PC port. This will assure
proper operation at all time.
Or
• Use Auto mode with same setting (10,000 mW).
If you get an error doing this operation – you need to check your PoE limitations (refer to the
product manual for additional information).
Additional Cisco PoE Resources:
General PoE information can be fond at
http://www.cisco.com/en/US/netsol/ns340/ns394/ns147/ns412/netbr09186a00801f4329.html
Cisco PoE White paper
http://www.cisco.com/en/US/netsol/ns340/ns394/ns147/ns412/networking_solutions_white_paper0
9186a008026641c.shtml
Cisco Catalyst 4500 PoE configuration:
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/12_2_25a/conf/poe.htm#wp1051434
Additional Catalyst 4500 configuration and settings:
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/12_2_25a/conf/poe.htm#wp1073691
Catalyst 6500 Series Power-over-Ethernet Daughter Cards Field-Upgrade Installation
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/cfgnotes/78_10826.htm
Understanding IP Phone In-Line Power Provisioning on the Catalyst 6500/6000 Switch
http://www.cisco.com/warp/public/788/AVVID/cat6k_inline_pwr.html