Avaya Power Over Ethernet Practical Manual

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A Practical Guide to Power Over Ethernet

(PoE) by Avaya

Release 1.1

ABSTRACT

This paper will discuss the highlights in the Power over Ethernet standard (IEEE 802.3af) and the earlier

pre-standard PoE implementations. Common implementation issues are also addressed to help you avoid

unpleasant surprises.

External posting: www.avaya.com.

Application Note

October 2006

COMPAS ID 122875

MJK

Avaya Labs

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Summary of Contents for Avaya Power Over Ethernet

Page 1 Release 1.1 Avaya Labs ABSTRACT This paper will discuss the highlights in the Power over Ethernet standard (IEEE 802.3af) and the earlier pre-standard PoE implementations. Common implementation issues are also addressed to help you avoid unpleasant surprises. External posting: www.avaya.com.
Page 2 Printed in U.S.A. TRADEMARK NOTICE Avaya and the Avaya Logo are trademarks of Avaya Inc. and may be registered in certain jurisdictions. All trademarks identified by ® or ™ are registered trademarks and trademarks respectively of Avaya Inc. All other trademarks are the property of their respective owners.
Page 3: Table Of Contents
The second part of this paper describes practical differences in Power over Ethernet (PoE) implementations of Avaya and Cisco equipment compared to the standard and to each other. This paper is not intended to point out shortcomings of any other vendor, but it is beneficial to reveal subtle issues in vendor specific implementations of PoE that can cause issues during and after installation.
Page 4: A Practical Guide To Power Over Ethernet (Poe) Paper
Ethernet cable. PSE – Power Sourcing Equipment. A PSE is a device that sends Power over Ethernet to the PD. End- Span and Mid-Span provide PoE, but there can also be other devices that send power to PDs.
Page 5: Ieee 802.3Af - How It Works
Mid-Span PSEs use only the spare pairs 4,5 & 7,8 to transmit power. All PDs are required to accept power on either spare or signaling pairs. All Avaya products comply with this requirement and can be powered three ways; from the signal pair, the spare pair or one pair (7,8) as a further option to support external power supplies like a “brick”...
Page 6 The IEEE 802.3af standard defines, but does not mandate, the use of power classes. This means a PD may advertise one, and only one power class. This is important for non-Avaya PSEs that logically allocate power from the total power pool and is discussed later in this paper. The following chart describes power (in watts) required by PDs and provided by PSEs.
Page 8 There is no manual configuration needed by a network administrator. Errors are avoided and time is saved because there is no manual effort required to administer power for PDs. Changes can be administered automatically or with a minimum of administrator effort. 2006 Avaya Inc. All Rights Reserved. Copyright ©...
Page 9: Poe Implementation Details
No proprietary protocol is needed to assess and calculate the power needs of an Avaya or other vendor’s PD as long as the PD is 802.3af compliant. For Avaya products, this means a PD that has been powered for an hour, say an Avaya 4620SW IP phone, and an EU-24 Expansion Button module is then attached to that phone, the PSE power is almost instantly increased to the PD to cover the additional power needed by the EU-24.
Page 10 Span. As you will see, there are fewer commands and command options using Avaya PSE products. All ports can be used on all of Avaya’s PSE equipment – even with the most power hungry Avaya PDs listed in the table below. This table lists very conservative power consumption numbers for Avaya IP phones.
Page 11 Table 5 Avaya 96xx IP Phone Power Consumption in Watts assuming 48 volts. Gig-E Model 9610 9620 9630 9630G 9640 9650 SMB-24 Adapter PoE Class Class 2 Class 2 Class 2 Class 2 Class 2 Class 2 Class 3 Typical (Not Backlit) 0.35...
Page 12: Avaya Configuration
6 Avaya Configuration Avaya has PoE in both a chassis based switch (C460) and fixed switches (C360, P330) as well as 802.3af capability in the G250 and G350 gateways. They all function the same way using the same CLI. The output is slightly different and is shown in tables below.
Page 13 The C360 series of Avaya switches have similar commands to the P330. The “show powerinline” command display is slightly different from the P330 in that it doesn’t show the power allocated class column. Again, Avaya switches, Mid-Spans and gateway power schemes do not require or rely on an advertised class of power.
Page 14: Cisco Configuration
Static is used to pre-allocate power to a port even before the switch senses a valid PD. This is a priority scheme to make sure the most important PDs always receive power. 2006 Avaya Inc. All Rights Reserved. Copyright ©...
Page 15 The max max-wattage option for the Auto and Static states is used to restrict the use of higher power Cisco PDs. This command should not be applied to Avaya or other vendor PDs. Be careful when using this option because there are two reasons fixed switches will remove power from a port:...
Page 16 If a line card supports PDs, ports begin removing power beginning at the highest port down to the lowest port before power is removed from that line card. This is another reason the show system command can be very useful. 2006 Avaya Inc. All Rights Reserved. Copyright ©...
Page 17 Use the command show module to check the status of the PoE line card installed and the daughter card if applicable. Note the sub-model at the bottom of the display shows the inline power daughter card (WS- F6K-GE48-AF) installed on the line card (model) WS-X6148-GE-TX. The status should be “OK”. 2006 Avaya Inc. All Rights Reserved. Copyright ©...
Page 18 PoE daughter card to manage 960 Watts for all ports. Again, worst-case, if class-3 PDs are used, only 62 ports could supply power. But using class-2 PDs, all 96 ports would give power. 2006 Avaya Inc. All Rights Reserved. Copyright ©...
Page 19 Valid values are 2000 to 15200 milliwatts. This option will reduce the amount of logically reserved power and is especially important when using class-3 PDs. 2006 Avaya Inc. All Rights Reserved. Copyright ©...
Page 20 12.1(11)EW Support “power inline” command was introduced on the Catalyst 4500 series switch. 12.1(19)EW Support added for static power allocation. 12.1(20)EW Support added for Power over Ethernet. CatOS 8.3(1)GLX support for “set port inlinepower” command expanded for all options listed.
Page 21 Prevents the port from providing power to a PD. Syntax is “set port inlinepower mod/port off” Two other commands are available but only apply to Cisco phones. Do not use these commands with Avaya phones. set inlinepower defaultallocation value set inlinepower notify-threshold value module mod 2006 Avaya Inc. All Rights Reserved. Copyright ©...
Page 22: Future Directions
Cisco is the predominant infrastructure of many Avaya customers. 8 Future Directions Power over Ethernet is still young and is changing. The IEEE 802.3af standard is being supplemented with a newer, but not yet ratified, IEEE 802.3at standard. This newer standard defines “double PoE” and seeks to raise the limit of 15.4 Watts per port to 30 Watts and possibly even higher to 60 Watts.
Page 23 Admin column values Auto or Static allow power, Never disables power to that port. Max max-wattage option with Auto or Static variables will allow power or pre-configure power to a port, but will disable power to an Avaya phone if set lower than the maximum value of the phones power class..
Page 24 “power inline allocation default xxxx” 4500 series Cat-OS: “set port inlinepower consumption xxxx” 6500 series IOS: “power inline auto max” “power inline static max” 6500 series Cat-OS: “set port inlinepower mod/port limit max” 2006 Avaya Inc. All Rights Reserved. Copyright ©...
Page 25 V < 10.1V > 10 µF Invalid Signature Lower Guard-band Start up and Steady State 12K Ω – 23.75K Ω Non-Compliant Upper Guard-band Start up and Steady State 26.25K Ω – 45K Ω Non-Compliant 2006 Avaya Inc. All Rights Reserved. Copyright ©...

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