1、 ETSI ES 201 910 V1.1.1 (2003-07)ETSI Standard Access and Terminals (AT);Digital Access to the Public Telephone Network;Line power requirements for IP terminalsETSI ETSI ES 201 910 V1.1.1 (2003-07) 2 Reference DES/AT-020013 Keywords IP, Terminal, LAN ETSI 650 Route des Lucioles F-06921 Sophia Antipo
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7、e benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI ES 201 910 V1.1.1 (2003-07) 3 Contents Intellectual Property Rights4 Foreword.4 Introduction 4 1 Scope 5 2 References 5 3 Definitions and abbreviations.5 3.1 Definitions5 3.2 Abbreviations .6 4 Line power specification for I
8、P terminals 6 4.1 Overview 6 4.1.1 Element requirements .6 4.1.2 Power management mechanism6 4.1.2.1 Power failure.6 4.1.2.2 Limited power .6 4.1.2.3 Power recovery .6 4.2 Power Sourcing Equipment (PSE) requirements7 4.2.1 Output power 7 4.2.1.1 Normal power .7 4.2.1.2 Limited power .7 4.2.1.2.1 Min
9、imum requirement.7 4.2.1.2.2 Optional requirement.7 4.2.2 Back-up power supply 7 4.2.3 Policy Controller requirements.7 4.2.3.1 Minimum requirement 7 4.2.3.2 Optional requirement 8 4.2.4 PSE Controller requirements 8 4.2.5 PSE power fail management mechanism8 4.2.5.1 At loss of primary PSE power.8 4
10、.2.5.1.1 Minimum requirement.8 4.2.5.1.2 Optional requirement.8 4.2.5.2 During limited power mode 9 4.2.5.2.1 Minimum requirement.9 4.2.5.2.2 Optional requirement.9 4.2.6 PSE power recovery9 4.3 PD requirements.9 4.3.1 Physical characteristics .9 4.3.2 Emergency PD classification 9 4.4 Safety requir
11、ements9 History 10 ETSI ETSI ES 201 910 V1.1.1 (2003-07) 4 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members,
12、and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp).
13、 Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the presen
14、t document. Foreword This ETSI Standard (ES) has been produced by ETSI Technical Committee Access and Terminals (AT). Introduction It was decided that ETSI would produce a specification identifying the requirements for IP terminals that are powered by the LAN network (802.3 data interface or MDI). I
15、n the IEEE specification mentioned in IEEE 802.3af 1, the following is specified: 1) Characteristics of the power supplied via the 802.3 data interface by the PSE (Power Sourcing Equipment). The PSE is able to decide whether the PD needs power or not by means of a detection algorithm and PD signatur
16、e. 2) Characteristics of the terminal (PD - Powered Device). Different classes of PDs are defined based on power consumption. Each PD must present a signature in order to receive power and could optionally present a signature for classification according to power consumption. The present document ad
17、opts all the physical characteristics of the PSE and the PD as specified in the IEEE specifications to keep the ETSI specification in line with the IEEE requirements. Since the specification in IEEE 802.3af 1 does not specify nor address the issue of PSE power supply interruptability or reliability,
18、 the present document includes requirements for a mechanism that will address the provisioning of emergency power to PDs in situations where the PSE primary power supply fails. This is in addition to the PSE and PD requirements adopted as per IEEE 802.3af 1. The intention with the additional require
19、ments is to provide a standard that will bridge the gap that exists in the reliability of provisioning of power in emergency conditions between: a) a traditional PSTN telephony network (where reliable and uninterrupted remote powering is provided); and b) a 802.3 network with remote powering of IP t
20、erminals (implemented in accordance with IEEE 802.3af 1) that does not cover the interruptability and reliability of provisioning of power. With the requirements as specified in the present document a basic mechanism (minimum requirement) is provided that will make it possible to implement an 802.3
21、network (with remote powering) and ensure basic operations in power fail emergency conditions, while optionally an advanced mechanism (optional requirement) is provided to make optimum use of the PD classifications as specified in the IEEE 802.3af 1. ETSI ETSI ES 201 910 V1.1.1 (2003-07) 5 1 Scope T
22、he present document specifies the requirements for line powering of IP Terminals connected to 802.3 interfaces. The present document is applicable to IP terminals connected to public networks and to customer premises equipment providing interfaces for the connection of IP terminals. The present docu
23、ment deals with an existing specification for powering requirements of IP terminals (see IEEE 802.3af 1). IP terminals could range from card readers, line powered security cameras to IP telephone terminals. The provisioning of power from public networks for IP terminals is also specified. 2 Referenc
24、es The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For a specific reference, subsequent revisio
25、ns do not apply. For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. 1 IEEE 802.3af: “IEEE Standard for Information Technology - Telecommunications and
26、Information Exchange Between Systems - Local and Metropolitan Area Networks - Specific Requirements - Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications - Data Terminal Equipment (DTE) Power Via Media Dependent Interface (MDI)“. 3
27、 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in IEEE 802.3af 1 and the following apply: Powered Device (PD): device that is either drawing power or requesting power by participating in the PD detection algorithm NOTE: A PD m
28、ay draw some or all of its power from the MDI. Media Dependant Interface (MDI): the 802.3 data interface where the PD is connected on the one side and where the power and data is provided on the other side of the interface Power Sourcing Equipment (PSE): equipment that provides the power to the link
29、 section (the link section is the point-to-point medium connection between an PD and a PSE), equipment that can supply power to the PD PSE Controller: an element or network management station external to the PSE which performs control functions Policy Controller: management station that determines w
30、hich ports receive priority power ETSI ETSI ES 201 910 V1.1.1 (2003-07) 6 3.2 Abbreviations For the purposes of the present document, the abbreviations defined in IEEE 802.3af 1 and the following apply: LAN Local Area Network MDI Media Dependant Interface PD Powered Device PSE Power Sourcing Equipme
31、nt 4 Line power specification for IP terminals 4.1 Overview The present document considers the elements that are required, and the methods used to combine these elements into a mechanism that will ensure that uninterrupted and reliable power is provided to IP terminals connected to an 802.3 network
32、via the MDI. 4.1.1 Element requirements The technical and functional requirements of four elements are described separately in the present document. In order to ensure optimum interoperability, the requirements of some of the elements are adopted from the IEEE standard mentioned in 1. These are the
33、Powered Device (PD) and the Power Sourcing Equipment (PSE). The newly defined elements are the PSE Controller and Policy Controller. Although these are described as separate elements, the intelligence to perform the respective functions could be embedded in the PSE. In certain cases, specific action
34、s may fulfil the requirements of a Policy or PSE Controller. 4.1.2 Power management mechanism This clause describes the mechanism used to manage power in the case of failure and or the recovery of the primary power supply to the PSE. The provision of power to the PDs will be managed by the Policy Co
35、ntroller in conjunction with the PSE Controller and the PSE. The present document makes provision for the formulation of a powering policy that may be implemented during power failure. The following conditions are covered. 4.1.2.1 Power failure In this clause the case of power failure of the primary
36、 power supply to the PSE and the provisioning of back-up power is discussed. Once on back-up power (limited power mode) the available power is managed according to a minimum requirement and optional advanced requirements. The minimum requirement is based on pre-defining of priority ports that will r
37、eceive power during limited power mode. The optional requirements allow the provisioning of power to be based on a powering policy that utilizes the classification of PDs (according to power consumption) by the PSE in order to manage back-up power. 4.1.2.2 Limited power This clause discusses the pow
38、er management actions of the PSE (in conjunction with PSE Controller and Policy Controller) while the PSE is in limited power mode. A basic minimum requirement is specified, as well as optional advanced requirements. Specific events are specified for each of the requirements of power failure managem
39、ent. 4.1.2.3 Power recovery This clause covers the condition where the primary power to the PSE is restored and power is provided on all ports and to any class of PD. ETSI ETSI ES 201 910 V1.1.1 (2003-07) 7 4.2 Power Sourcing Equipment (PSE) requirements All physical characteristics of the PSE will
40、be in accordance with IEEE 802.3af 1, unless specifically mentioned. 4.2.1 Output power 4.2.1.1 Normal power During normal power provisioning, the provision of power shall be in accordance with IEEE 802.3af 1. 4.2.1.2 Limited power The PSE is considered to be in the limited power mode when primary p
41、ower supply to the PSE has failed and the PSE is powered by a back-up power supply. 4.2.1.2.1 Minimum requirement During limited power, power shall be provided on ports designated as emergency only. 4.2.1.2.2 Optional requirement The PSE shall provide enough power on each port, that could be permane
42、ntly or temporarily designated as emergency, to power a pre-selected class of PD in accordance with a powering policy to be implemented by the Policy Controller. The present document does not define the powering policy that is used to select or determine the number or the class of PDs that are to be
43、 supplied with power, or not. If, in an emergency situation, the PSE power is derived from a source in other networks, for which other more restrictive emergency conditions/regulations/standards apply, then it may not be possible for the PSE to comply with the present document. 4.2.2 Back-up power s
44、upply In order to maintain a limited supply of power to PDs required to function in an emergency power situation (when the primary power to the PSE fails), it is necessary that the PSE is backed up by an emergency power unit, batteries/generator. The back-up power supply is brought into use when the
45、 normal supply to the PSE fails. The backup supply may not be able to supply the full load and/or may be available for a duration limited by battery or fuel tank capacity. The PSE Controller may be able to determine an estimate of the remaining capacity. The present document does not define the type
46、 of back-up power. The present document does not define the time period that back-up power must be provided. 4.2.3 Policy Controller requirements The Policy Controller is a management station that determines which ports receive priority power. 4.2.3.1 Minimum requirement During system commissioning,
47、 emergency ports that must continue to receive power in the case of failure of primary power supply (to the PSE), shall be designated. ETSI ETSI ES 201 910 V1.1.1 (2003-07) 8 4.2.3.2 Optional requirement The Policy Controller may implement a powering policy that utilizes the classification of PDs (a
48、ccording to power consumption) to decide what class (es) of PDs are to be powered during limited power mode, and on which ports. The present document does not define whether the association is with user (wherever his number is call forwarded to), terminal telephone number, terminal IP address, or ph
49、ysical port number. The Policy and PSE Controllers must be able to map (whether automatically or by manual input) between the physical port and the IP address of the device on that port, and handle the case of a subsidiary (possibly unmanaged) hub being connected to a port. - The port to address mapping is required if priority terminals are defined by physical port. - The address to port mapping is required if priority terminals are defined by IP address. The Policy Controller must be able to maintain the list detailing which of the ports are perma
