1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-0900414.2012 NETWORK TO CUSTOMER INSTALLATION INTERFACES ENHANCED 911 ANALOG VOICEGRADE PSAP ACCESS USING LOOP REVERSE-BATTERY SIGNALING ATIS is the leading technical planning and standards development organization committed to the rapid develo
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11、 current information on all standards by calling or writing the American National Standards Institute. Notice of Disclaimer it is a control signal used to prepare the CI to receive digits. 2.1.16 multi-frequency (MF) signaling: An ac signaling method that uses the simultaneous transmis-sion of two f
12、requencies from a group of six frequencies to represent numerical values and control signals. 2.1.17 network: For this standard, the network is the combination of the Enhanced 911 switching sys-tem and the carrier network connecting the switching system to the PSAP. 2.1.18 network interface (NI) - D
13、emarcation point: The point of interconnection between a network and the CI. 2.1.19 network outpulsing state: A call state in which the network transmits the CESID to the PSAP CI. 2.1.20 numbering plan digit (NPD): A number associated with the 7-digit CESID format that repre-sents one of the numberi
14、ng plan area (NPA) codes (area codes) that are served by the PSAP CI. In the 7-digit CESID format, up to four NPA codes may be represented. 2.1.21 off-hook signal: The network off-hook signal at the NI is a low resistance tip-to-ring path. The CI off-hook signal at the NI is a ground on the ring con
15、ductor and a negative voltage on the tip conductor. 2.1.22 on-hook signal: The network on-hook signal at the NI is a high-resistance tip-to-ring path. The CI on-hook signal at the NI is a ground on the tip conductor and a negative voltage on the ring conductor. 2.1.23 primary PSAP CI (PPCI): The PSA
16、P CI that controls the call bridging and transfer process by transmitting flash, address, and disconnect signals. 2.1.24 Public Safety Answering Point: (PSAP) An answering location for emergency service calls that are originated in a given geographical area. A PSAP will dispatch the appropriate emer
17、gency service needed, such as police, fire, or medical. 2.1.25 rise time: An MF and DTMF signal timing interval during which the signal is changing from the signal-off state to the signal-on state. For MF signals, rise time begins when either tone of the MF tone pair exceeds 58 dBm and ends when bot
18、h tones of the MF tone pair exceed 90 percent of their respec-ATIS-0900414.2012 4 tive steady-state values at the NI. For DTMF signals, rise time begins when either tone of the DTMF tone pair exceeds -55 dBm and ends when either tone is within 1 dB of their ultimate steady state value. 2.1.26 second
19、ary PSAP CI (SPCI): The PSAP CI that is bridged onto a three-way call as the result of action taken by a primary PSAP CI. 2.1.27 seizure state: A call state initiated by the network. During this state, the PSAP CI prepares to receive network outpulsing. 2.1.28 signal duration: An MF or DTMF signal t
20、iming interval during which the signal is being transmit-ted. For MF signals, the signal duration interval begins when the last tone of the MF tone pair exceeds 90 percent of its steady-state value and ends when either tone of the MF tone pair falls below 90 percent of its respective steady-state va
21、lue. For DTMF signals, the signal duration interval begins when either tone of the DTMF signal is within 1 dB of its eventual steady state value and ends when either tone falls 1 dB below its steady state value. 2.1.29 signal-off duration: An MF or DTMF signal timing interval that starts when the fa
22、ll time of one signal ends. The interval ends when the rise time of the next signal begins. 2.1.30 ST (start) signal: The last signal of an MF outpulsing format; it is a control signal used to indi-cate the end of a field of information. 2.1.31 supervisory signaling: Specific electrical conditions a
23、t the NI (called on-hook and off-hook) that are used to control call states and processes. 2.1.32 STP (start prime) signal: The last signal of the wireline 10-digit MF outpulsing format. It is a con-trol signal used to indicate the end of a field of information. In the 10-digit format, it is used to
24、 indicate that no more digits will be transmitted, thus distinguishing between the wireline format and the wireless format. 2.1.33 voiceband: The frequency range commonly associated with the transmission of speech; gener-ally considered to be a frequency range of 300 to 3000 Hz. 2.1.34 wink-start si
25、gnal: An off-hook signal of a defined duration that indicates that the PSAP CI is ready to receive network outpulsing. 2.1.35 wireless: A term associated with a network or terminal that uses electromagnetic waves rather than wire conductors for telecommunications. 2.1.36 wireline: A term associated
26、with a network or terminal that uses metallic wire conductors for tele-communications. 2.2 Abbreviations, Acronyms, Seizure state; Network outpulsing state; Call-processing state; Communications state; Call bridging and transfer process (optional); and Disconnect. The CI provides direct current (dc)
27、 power at the NI for supervisory signaling. The network supervisory signals are on-hook (high resistance, between the tip and ring conductors at the NI) and off-hook (low resistance, between the tip and ring conductors at the NI). The CI supervisory signals are on-hook (nor-mal battery polarity) and
28、 off-hook (reverse-battery polarity). Supervisory signaling requirements are speci-fied in clause 5. 4.2 Idle State In the idle state, the CI is available for seizure by the network. This state begins with the completion of the disconnect process and ends when the network applies an off-hook signal
29、to the NI. In the idle state, both the network and the CI shall apply an on-hook signal at the NI. If the network is capable of recognizing a CI off-hook signal during this state and the CI applies an off-hook signal at the NI, the CI shall be considered “busy” and the network shall not apply an off
30、-hook at the NI. 4.3 Seizure State In the seizure state, the CI prepares to receive signals from the network. This state begins when the net-work applies an off-hook signal at the NI, and ends at the conclusion of a short-duration off-hook signal applied at the NI by the CI. This short duration of o
31、ff-hook is called a wink-start signal and indicates that the CI is ready to receive network outpulsing. During the seizure state, the network shall apply an off-hook signal at the NI. The network off-hook signal shall persist without interruption until disconnect is ini-tiated. During the seizure st
32、ate, the CI shall apply an on-hook signal, followed by the wink-start signal. The CI should return the wink-start signal in less than 4 s after receiving the network off-hook signal. The dura-tion of the wink-start signal at the NI shall be 250 50 ms. If the wink-start signal is not applied at the N
33、I within 16 to 20 s, the network should initiate the disconnect process described in 4.8. 4.4 Network Outpulsing State In this state, the network transmits MF signals that identify the CESID associated with the calling wireline or wireless terminal. The cell site and sector associated with the calli
34、ng wireless terminal can be transmit-ted if the 10-digit format is used. This state follows the seizure state and begins at the conclusion of the ATIS-0900414.2012 9 CI wink-start signal and ends when the last MF signal, ST or STP, has been transmitted by the Enhanced 911 network. The CI should reco
35、gnize MF signals received 35 ms or more after the beginning of this state. The CI shall recognize MF signals that meet the requirements of clause 6. During this state, the network shall apply an off-hook signal at the NI and the CI shall apply an on-hook signal at the NI. 4.5 Call-processing State T
36、his state begins when the network has completed network outpulsing and ends when the call is an-swered at the CI or when the network terminates the call attempt by initiating disconnect. During this state, the network shall apply an off-hook signal at the NI and the CI shall apply an on-hook signal
37、at the NI. Audible ringing shall be applied at the NI by the CI while the attendant is being alerted. 4.6 Communications State This state begins when the PSAP CI applies an off-hook signal, as specified in 5.2.3, at the NI and estab-lishes a two-way communications path between the NI and the PSAP at
38、tendant. In this state, both the PSAP CI and the network shall apply an off-hook signal at the NI. During the communications state, the PSAP CI shall ignore network on-hook signals at the NI of 200 ms or less. 4.7 Call Bridging or, after the expiration of a network timing interval. The network timin
39、g interval should be 4 to 5 seconds, but may be longer. 5 Supervisory Signaling The call states are supervised through the use of two dc electrical states at the NI called on-hook and off-hook. 5.1 Network Requirements 5.1.1 On-hook Signal When the network is applying an on-hook signal to the NI, th
40、e resistance between the tip conductor and the ring conductor at the NI shall exceed 15k.4The resistance between the tip conductor and ground and between the ring conductor and ground should exceed 26k. The capacitance between tip conduc-tor and the ring conductor at the NI should not be greater tha
41、n 5f. 5.1.2 Off-hook Signal When the network is applying an off-hook signal to the NI, the resistance between the tip conductor and the ring conductor at the NI shall be between 180 and 3750. This requirement shall be met when measured with a potential between the tip and ring conductors of 4.0 V dc
42、 to 56.7 V dc, applied in either polarity. The resistance to ground should exceed 22.5k. 5.1.3 Recognition of CI Supervisory Signals When the network is sending an off-hook signal to the NI, it shall recognize the polarity of tip more posi-tive than ring at the NI as the CI on-hook signal, and tip m
43、ore negative than ring at the NI as the CI off-hook signal. This requirement should also be met when the network is sending an on-hook signal. (See 4.2.) _ 4This resistance is measured with a floating (not connected to ground) measuring device. ATIS-0900414.2012 11 5.2 CI Requirements 5.2.1 Voltage
44、At the NI, the CI shall provide a voltage that is negative relative to ground on one conductor. The open-circuit voltage on this conductor shall be between 42.75 V dc and 56.7 V dc. The open circuit voltage on the other conductor shall be between 0.0 V dc to 5.0 V dc relative to ground. The PSAP CI
45、shall pro-vide at least 10 mA in both the tip and ring conductors at the NI when the network resistance between the tip and ring conductors at the NI is less than or equal to 3750. 5.2.2 On-hook Signal When the CI is sending an on-hook signal, the tip conductor shall be positive with respect to the
46、ring con-ductor at the NI. 5.2.3 Off-hook Signal When the CI is sending an off-hook signal, the tip conductor shall be negative with respect to the ring conductor at the NI. 5.2.4 Recognition of Network Supervisory Signals The CI shall recognize a resistance of 3750 or less connected between the tip
47、 and ring conductors at the NI as a network off-hook signal. The CI shall recognize the conditions specified in 5.1.1 as a network on-hook signal. 6 MF Signaling 6.1 Description of MF Signaling MF signaling uses combinations of two, and only two, of six voiceband frequencies to represent numerical i
48、nformation and control signals. 6.2 MF Signaling Requirements The MF signals transmitted by the network shall meet the following requirements when measured with a 600 ohm ac test termination across the tip and ring conductors at the NI. 6.2.1 MF Frequencies MF signals shall consist of two sinusoidal
49、 tones from a group of six frequencies and shall represent the characters shown in Table 1. The frequencies of the tones at the NI shall be within 1.5% (+ 5 Hz) of the nominal values shown in Table 1. ATIS-0900414.2012 12 Table 1 - MF Frequencies MF Characters Nominal Frequencies (Hz) 1 700 + 900 2 700 + 1100 3 900 + 1100 4 700 + 1300 5 900 + 1300 6 1100 + 1300 7 700 + 1500 8 900 + 1500 9 1100 + 1500 0 1300 + 1500 KP 1100 + 1700 STP 900 + 1700ST 1500 + 1700 6.2.2 MF Signal Timing The timing elements of the MF signals are rise time, signal duration, fall ti
