Mitel 5560 IPT none Specifications download pdf (Page 108)

Engineering Guidelines

The CXi/CXi II controller’s Layer 2 switch can provide 100 Watts of power to 802.3af-compatible

devices according to the following general rules:

• Depending on the phone and option power requirements, up to 16 IP Phones could be

supported.

• Up to four PKMs (PKM12 or PKM48) are supported on Dual Mode IP Phones. Only one

PKM can be attached to a set. Multiple PKMs on a set require an AC adapter.

• Conference units require an AC adapter.

• Class 1, 2, and 3 devices receive 4, 7, and 13 Watts, respectively. Unclassified (Class 0)

devices are budgeted 7.5 Watts by the PoE subsystem, but can receive up to 13 Watts.

• Port 1 has the highest priority, port 16 the lowest.

The CXi and the CXi II PoE sub-sections are functionally identical with one exception, the

mechanism used by the controller to determine the IP phone power requirements is different.

• The CXi uses the IEEE 802.3af power advertisements transmitted from the phones to

determine how much current the phones will draw.

• The CXi II measures the actual current that the phones are drawing.

In both cases a maximum of 100 Watts of PoE power is enforced.

If the maximum system power budget of 100 watts is exceeded, power will be turned off to the

ports, starting with port 16 and ending with port 1, until less than 100 Watts is being consumed.

The System Administration Tool provides a maintenance command (L2 PoEStatus) that can

be used to determine what power advertisements the CXi has received from the various phones.

If you are using a CXi II, this maintenance command will provide the actual power being

consumed, based on measurements by the phones that have been installed.

Third party 802.3af powering

The following vendors offer IEEE 802.3af compliant network equipment that can supply power

over Ethernet wiring to the phones.

HP (Hewlett-Packard)

• HP 2650-PWR/2626-PWR

• HP 5300 XL with expandable 10/100 PoE modules

Cisco

• Cisco 3560 series

• Newer versions of Cisco 4500 series

• Newer versions of Cisco 6500 series

CAUTION: The information in this section is believed to be accurate but is not

warranted by Mitel. Please refer to the respective vendor documentation to

verify IEEE 802.3af compliancy.

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Mitel 5560 IPT none Specifications Page 108