1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-0600337.2016 Requirements for Maximum Voltage, Current, and Power Levels Used in Communications Transport Circuits As a leading technology and solutions development organization, the Alliance for Telecommunications Industry Solutions (ATIS) bri
2、ngs together the top global ICT companies to advance the industrys most pressing business priorities. ATIS nearly 200 member companies are currently working to address the All-IP transition, 5G, network functions virtualization, big data analytics, cloud services, device solutions, emergency service
3、s, M2M, cyber security, network evolution, quality of service, billing support, operations, and much more. These priorities follow a fast-track development lifecycle from design and innovation through standards, specifications, requirements, business use cases, software toolkits, open source solutio
4、ns, and interoperability testing. ATIS is accredited by the American National Standards Institute (ANSI). The organization is the North American Organizational Partner for the 3rd Generation Partnership Project (3GPP), a founding Partner of the oneM2M global initiative, a member of and major U.S. co
5、ntributor to the International Telecommunication Union (ITU), as well as a member of the Inter-American Telecommunication Commission (CITEL). For more information, visit www.atis.org. AMERICAN NATIONAL STANDARD Approval of an American National Standard requires review by ANSI that the requirements f
6、or due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means
7、 much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made towards their resolution. The use of American National Standards is completely voluntary; their existence does not in any respect prec
8、lude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation
9、of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name app
10、ears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of Americ
11、an National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Notice of Disclaimer see Section 2.2 of UL/CSA 60950-1 for further details and conditions. 3.1.3 Secondary Circuit: A circuit which has no direct connection to a pr
12、imary circuit and derives its power from a transformer, converter or equivalent isolation device, or from a battery. 3.1.4 Telecommunications Network Voltage (TNV) Circuit: A secondary circuit in the equipment to which the accessible area of contact is limited, which is so designed and protected tha
13、t under normal and single fault conditions, the voltages do not exceed specified limiting values. TNV circuits are classified as TNV-1, TNV-2, and TNV-3 circuits. This definition is paraphrased from UL/CSA 60950-1; see Section 1.2.8.11 of UL 60950-1 for further details and conditions. UL/CSA 62368-1
14、 defines these as ES-1 and ES-2 external circuits instead of TNV. Table 3.1 (1A from UL 60950-1) Voltage Ranges of SELV and TNV Circuits Normal Operating Voltages Overvoltages from TELECOMMUNICATION NETWORKS Possible? Overvoltages from CABLE DISTRIBUTION SYSTEMS Possible? Within SELV CIRCUIT Limits
15、Exceeding SELV CIRCUIT Limit but Within TNV Circuit Limits Yes Yes TNV-1 CIRCUIT TNV-3 CIRCUIT No Not Applicable SELV CIRCUIT TNC-2 CIRCUIT 3.1.5 TNV-1 Circuit: A TNV circuit whose normal operating voltages do not exceed the limits for a SELV circuit value (42.4 V ac peak or 60 V dc) under normal op
16、erating conditions and on which overvoltages from telecommunication networks (up to 1500 V peak) are possible. This definition is paraphrased from Section 1.2.8.12 of UL/CSA 60950-1. This is classified as an ES-1 External Circuit in UL/CSA-62368-1. ATIS-0600337.2016 3 3.1.6 TNV-2 Circuit: A TNV circ
17、uit whose normal operating voltages exceed the limits for a SELV circuit, but do not exceed 71 V ac peak or 120 V dc with current limitations under normal operating conditions and is not subject to overvoltages from telecommunication networks. This definition is paraphrased from Section 1.2.8.13 of
18、UL 60950-1. This is classified as an ES-2 External Circuit in UL-62368-1. 3.1.7 TNV-3 Circuit: A TNV circuit whose normal operating voltages exceed the limits for a SELV circuit, but do not exceed 71 V ac peak or 120 V dc with current limitations under normal operating conditions and on which overvo
19、ltages from telecommunication networks (up to 1500 V peak) are possible. TNV-3 includes provisions for interrupted ringing and message waiting type signals that exceed 71 V ac peak or 120 V dc. This definition is paraphrased from Section 1.2.8.14 of UL/CSA 60950-1. This is classified as an ES-2 Exte
20、rnal Circuit in UL/CSA 62368-1. 3.1.8 RFT Circuit (Remote Feeding Telecommunications Circuit): A secondary circuit intended to supply or receive dc power via a telecommunications network at voltages exceeding the limits for TNV Circuits, and on which overvoltages from telecommunications networks are
21、 possible (a RFT circuit is also commonly known in the industry as line powering or span powering). NOTE: A RFT circuit may or may not include some form of signaling on the twisted pairs. 3.1.9 RFT-V Circuit: An RFT Circuit which is so designed and protected that under normal operating conditions an
22、d single fault conditions, the voltage, current, and power are limited and the accessible area of contact is limited to those values contained in Section 6.2 of UL/CSA 60950-21. RFT-V has traditionally only been used in North America, but has been adopted in other regions of the world as well. 3.1.1
23、0 RFT-C Circuit: A current limited RFT circuit that is used in countries outside of North America. 3.1.11 Reverse Line Powering: A power delivery technique that, unlike traditional line powering, derives the power on the twisted pairs from the customers equipment, which is fed back toward a service
24、providers network element for use in powering that equipment. The power can come from a single customer, or as additional customers are added, power is shared between each customer. 3.2 Abbreviations The telephone ringing signals comply with the appropriate ring-trip and cadence requirements of thes
25、e standards; Intra-building; Classified as ES-2 in the UL/CSA 62368-1 safety standards. Examples of these types of circuits might include PBX POTS ports or some form of proprietary communications system, but in general this category of TNV circuit would not be encountered. ATIS-0600337.2016 13 C.1.1
26、.3: Telecommunications Network Voltage 3 (TNV-3) Circuit A TNV telecommunications circuit whose: Normal operating voltages, exceeding SELV, other than telephone ringing signals, that do not exceed the following: o (Uac / 71) + (Udc / 120) 1; o Where Uac is the peak value of the ac voltage (V) at any
27、 frequency and Udc is the value of the dc voltage (V); o For voltages exceeding 42.4 v peak or 60 v dc, the current flowing through any resistance 2000 ohms or greater connected across the voltage source with the other loads disconnected does not exceed 7.1 ma peak or 30 ma dc. Voltages such as tele
28、phone ringing signals are less than 300 V peak-to-peak and less than 200 V peak-to-earth, measured across a resistance of at least 1 Megohm; The telephone ringing signals comply with the appropriate ring-trip and cadence requirements of these standards; and On which overvoltages (transients due to a
29、tmospheric or environmental disturbances) from telecommunications networks are possible. Examples of these types of circuits are FXO, FXS, POTS, Reverse Line/Span Powering, etc. NOTE: The above (except the last bullet item) also applies to TNV-2. C.1.2: The maximum continuous current provided shall
30、not exceed a current limit of 1.3 A per conductor. This value is based on the consideration that a minimum 26 AWG telephone cable will be utilized in the end-product installation. If the installation instructions specify a larger wire gauge to be utilized, the current limit can increase appropriatel
31、y. C.1.3: This standard assumes TNV circuits are 15VA or less, and defers power limitations for circuitry connected to the line/span powering equipment of a telecommunications network to UL/CSA 60950-21. However, NFPA-70 (NEC) imposes the following limitations. The maximum normal operating power tha
32、t can be applied to any twisted pair in a telecommunications network circuit (or delivered to any unique load circuit) shall not exceed 100 volt-amperes (for dc systems, 1 volt-ampere equals 1 watt). The maximum current rating into the intended load under normal operating conditions is 100/Vmax, whe
33、re Vmax is the maximum output voltage regardless of the load impedance (15mohms to 1Mohm) The maximum continuous current from sources that may be applied to telecommunications conductors shall not exceed 1.3 A unless the ampacity of the wiring and network components is specified and compatible at th
34、at current level. The maximum output current (Imax) under overload and fault conditions shall not exceed 150/Vmax or 2.4A, whichever is less. C.1.4: This standard currently does not define any classifications for telecommunications circuits that provide normal operating voltages that exceed: 71 V pe
35、ak or 120 V dc with current limitations. 42.4 V peak or 60 V dc without current limitations. These criteria are contained in UL/CSA 60950-21. C.2 GR-1089-CORE GR-1089-CORE is applicable to equipment that forms all aspects of the telecommunications network. Examples of this type of equipment are cent
36、ral office equipment, equipment placed in controlled environmental vaults, electronic equipment cabinets/enclosures, huts, and network equipment located at the customer premises. A summary of the requirements found within this document is noted in C.2.1 C.2.3 below. ATIS-0600337.2016 14 C.2.1: GR-10
37、89-CORE currently classifies continuous dc voltage sources found within this document under three different headings as shown in C.2.1.1 C.2.1.3 below. Circuits containing Class A1, A2, and A3 voltages may be contacted barehanded by a trained craftsperson. Other levels of accessibility are provided
38、for other types of individuals. The test methodology to determine compliance with these requirements is detailed within the applicable sections of the GR-1089-CORE document. Accessibility to the voltages below is defined in Annex D. C.2.1.1: Class A1 Voltages: A telecommunications circuit whose: Nor
39、mal operating dc voltage is not greater than 30 volts to ground; or Normal operating dc voltage exceeds 30 volts to ground, but not greater than 200 volts to earth, and the dc current is limited to 0.15 mA dc to ground (when tested appropriately). C.2.1.2: Class A2 Voltages: A telecommunications cir
40、cuit whose: Normal operating dc voltage is not greater than 80 volts to ground; or Normal operating dc voltage exceeds 80 volts to earth, but not greater than 200 volts to ground, and the dc current is limited to 5.0 mA dc to ground (when tested appropriately). Accessibility requirements do apply. C
41、.2.1.3: Class A3 Voltages: A telecommunications circuit whose: Normal operating dc voltage is not greater than 140 volts to ground, or Normal operating dc voltage exceeds 140 volts to ground, but not greater than 200 volts to ground, and the dc current is limited to 10.0 mA dc to ground (when tested
42、 appropriately). Accessibility requirements do apply. Class A3 is rarely permitted and is reserved for legacy equipment compatibility such as T1, not new installations and equipment. C.2.2: The maximum normal operating power that can be applied to any twisted pair in a telecommunications network cir
43、cuit (or delivered to any unique load circuit) shall not exceed 100 volt-amperes (for dc systems, 1 volt-ampere equals 1 watt). The maximum current rating into the intended load under normal operating conditions is 100/Vmax, where Vmax is the maximum output voltage regardless of the load impedance (
44、15mohms to 1Mohm). The maximum continuous current from sources that may be applied to telecommunications conductors shall not exceed 1.3 A unless the ampacity of the wiring and network components is specified and are compatible at that current level. The maximum output current (Imax) under overload
45、and fault conditions shall not exceed 150/Vmax or 2.4A, whichever is less. C.2.3: Transient Sources: Transient sources, such as those caused by the operation of relays, power supply transients, or ground fault interrupt (GFI) circuits may exceed 200 volts but shall meet the following two conditions:
46、 Their duration shall be less than 10 ms; and They shall produce no more than 2 joules of energy into a 500 ohm resistive load. C.2.4: Interrupted Sources: Interrupted sources, such as ringing or other control signals, lasting longer than 10 ms but less than five seconds. These sources must meet the
47、 following conditions: These voltages must be less than 300 volts peak-to-peak, 200 volts peak-to-ground, when applied to a 1 megohm or greater resistive load. These voltages must not be applied to the telecommunications conductors for longer than five seconds before being interrupted for at least o
48、ne second. During the interrupted or idle interval, the voltage to ground must not exceed class A2 voltage limits. ATIS-0600337.2016 15 Interrupted/tripped voltage sources shall include a series current-sensitive tripping device in the current lead that will satisfy one or both of the following: 1.
49、Trip the voltage as required by UL/CSA 60950-1, or GR-1089-CORE. 2. Provide a voltage to ground, which is also known as a “monitoring” voltage, on the tip or ring conductor with a magnitude of at least 19 volts peak which shall not exceed Class A2 limits when the interrupted voltage is not present (idle interval). C.3 UL/CSA 60950-21 CAN/CSA-C22.2 60950-21-03 This standard is summarized below and defines the remote feeding telecommunications circuit-voltage limited (RFT-V) as having the following characteristics: 1. These voltage
