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1、 TIA STANDARD ANSI/TIA-689-A-2003 Approved: March 28, 2003 Telecommunications Multiline Terminal Systems PBX and KTS Support of Enhanced 9-1-1 Emergency Calling Service TIA-689-A (Revision of TIA/EIA-689) MARCH 2003 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representing the telecommunications industry
2、 in association with the Electronic Industries Alliance Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:27:40 MDTNo reproduction or networking permitted without license from IHS
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8、al No. 3-3836-RV1, formulated under the cognizance of the TIA TR-41.1 Subcommittee on Multiline Terminal Systems.) Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 2003 Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 U.S.A. PRICE: Please refer to current Catalog of
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10、ht Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:27:40 MDTNo reproduction or networking permitted without license from IHS -,-,- NOTICE OF DISCLAIMER AND LIMITATION OF LIABILITY The doc
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25、or Resale, 03/29/2007 21:27:40 MDTNo reproduction or networking permitted without license from IHS -,-,- TIA-689-A 1 TABLE OF CONTENTS 1 INTRODUCTION5 1.1 Enhanced 911 Emergency Calling Service5 2 SCOPE.9 3 REFERENCES.10 3.1 Normative References10 3.2 Mandatory and Advisory Requirements .11 4 DEFINI
26、TIONS, ABBREVIATIONS AND ACRONYMS11 4.1 Definitions 11 4.2 Abbreviations and Acronyms13 5 TECHNICAL REQUIREMENTS14 5.1 General 14 5.1.1 Dialing 14 5.1.1.1 Three Digit 911 Dialing.14 5.1.1.2 Dial 9 Blocking14 5.1.2 Call Routing 14 5.1.2.1 Automatic Route Selection.14 5.1.2.2 Recognition of Made-Busy
27、Conditions .14 5.1.2.3 Alternate Routing for Out-of-Service Conditions 15 5.1.2.4 Alternate Routing for Trunk Made-Busy Conditions .15 5.1.2.5 Alternate Routing for Busy, Made-Busy resistors R2 + RL having a value between 400 and 4200 ohms; voltages between 35 and 80 volts; and the polarity switch i
28、n either position. 5.2.3.11.6 Signal Levels The analog 911 CAMA trunk shall comply with all of the applicable FCC Rules and Regulations in 47 CFR Part 68 Normative Reference 5, section 68.308. In addition, when the analog 911 CAMA trunk is transmitting a MF signal, the maximum MF signal power delive
29、red to a 600-ohm termination shall not exceed -6 dBm. When the analog 911 CAMA trunk is not transmitting a MF signal, the maximum power at any MF frequency, delivered to a 600-ohm termination, shall not exceed -58 dBm. 5.2.3.12 Recognition of Made-Busy Conditions When in the idle condition, the MLTS
30、 shall recognize a trunk made-busy signal consisting of reverse battery polarity between the tip and ring (ring more positive than tip). The MLTS shall not attempt to complete a call over a 911 CAMA trunk when the network signals a made-busy condition. 5.2.3.13 ELIN Failure The KP+2+ST ELIN failure
31、sequence shall be transmitted only when permitted by the Enhanced 911 system provider and only when MLTS equipment failure prevents the determination of outpulsing of the ELIN. The Enhanced 911-system provider may require a default ELIN to be used instead of the KP+2+ST failure sequence. 5.2.4 Digit
32、al 911 CAMA Trunk A single DS0 of a channelized DS1 service may be used to provide a digital 911 CAMA trunk described in this standard. Per-channel robbed-bit signaling shall be employed. 5.2.4.1 Call States and Processes When a digital 911 CAMA trunk is used, the call state and disconnect sequence
33、requirements in subsections of 5.2.3 shall be applicable. 5.2.4.2 Supervisory Signaling The on-hook and off-hook supervisory signals that are used to control call states and processes shall conform to the signaling requirements in ANSI TIA-464-C-2002 Normative Reference 3, section 7.2. 5.2.4.3 Digit
34、al Encoding/Decoding In order to provide compatibility with existing networks in North America, -law encoding/decoding as specified in Normative Reference 6 for voiceband encoding and decoding shall be used for digital 911 CAMA trunks. Copyright Telecommunications Industry Association Provided by IH
35、S under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:27:40 MDTNo reproduction or networking permitted without license from IHS -,-,- TIA-689-A 22 5.2.4.4 MF Signaling The MF signaling used with a digital 911 CAMA trunk shall meet the requirements
36、 in section 5.2.3 when encoded/decoded using -law. 5.2.4.5 Loss Plan Nominal values for interface-to interface connections involving ISPBX lines and trunks are given in Table 12 of ANSI TIA-464-C-2002 Normative Reference 3. The digital 911 CAMA trunk should receive the AAL(D) loss treatment. 5.2.4.6
37、 Noise and Distortion Impairments The digital 911 CAMA trunk port shall meet the MLTS idle channel noise, crosstalk coupling loss, quantization distortion, and single frequency distortion requirements of ANSI TIA-464-C- 2002 Normative Reference 3. 5.2.4.7 Signal Levels Digital 911 CAMA trunks shall
38、comply with all of the applicable FCC Rules and Regulations in 47 CFR Part 68 Normative Reference 5, section 68.308. In addition, when the digital 911 CAMA trunk is transmitting an MF signal, the maximum equivalent power of the encoded MF signals as derived by a test configuration with a -law PCM de
39、coder as specified in Normative Reference 6 and delivered to a 600-ohm termination shall not exceed -6 dBm. When the digital 911 CAMA trunk is not transmitting an MF signal, the maximum power delivered to a 600-ohm termination at any MF frequency shall not exceed -58 dBm. 5.2.4.8 Recognition of Made
40、-Busy Conditions The made-busy process for digital 911 CAMA trunks shall conform to the specifications in section 7.2.2.6 of ANSI TIA-464-C-2002 Normative Reference 3. The MLTS shall not attempt to complete a call over a 911 CAMA trunk when the network signals a made-busy condition. 5.2.4.9 ELIN Fai
41、lure The KP+2+ST ELIN failure sequence shall be transmitted only when permitted by the Enhanced 911 system provider and only when MLTS equipment failure prevents the determination of outpulsing of the ELIN. The Enhanced 911-system provider may require a default ELIN to be used instead of the KP+2+ST
42、 failure sequence. 5.2.5 ISDN Trunk Interface 5.2.5.1 General ANSI T1.607-2000, DSS1 Layer 3 Signaling Specification Normative Reference 12 and ANSI T1.628-2000, Emergency Calling Service (ECS) Normative Reference 8 contain ISDN signaling requirements for an Enhanced 911 call at the originating user
43、-to-network interface (e.g., MLTS-to-network). 5.2.5.2 Conformance with Other Industry Practices and Standards Some Service Providers may offer Enhanced 911 Calling Services using an ISDN Trunk Interface and operating standards other than as set forth in Section 5.2.5. The methods and technical requ
44、irements used by these Service Providers are out of the scope of this Standard. Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:27:40 MDTNo reproduction or networking permitted
45、without license from IHS -,-,- TIA-689-A 23 The ISDN signaling requirements in this section are in conformance with standards set forth in ANSI TIA-464-C-2002 Normative Reference 3. In addition, the ISDN signaling requirements set forth in ANSI T1.628-2000 Normative Reference 8 and ANSI T1.628a-2001
46、 Normative Reference 9 are consistent with the NENA Enhanced 911 Multi-line System Model Legislation Informative Reference 3. 5.2.5.3 Signaling Requirements Section 6.1.3.1 and 6.2.4.1 of ANSI T1.628-2000 Normative Reference 8 specifies that a Codeset 5 IE, “Generic information (GI)” containing a Lo
47、cation Identification Number (LIN) may optionally be sent to the public network in a SETUP message of an Enhanced 911 call. This information element shall be sent for an Enhanced 911 call whenever an MLTS has users located in more than one ERL. The LIN is sent in addition to the normal ISDN signalin
48、g elements that are defined for basic call control. In ANSI T1.628-2000 Normative Reference 8, the LIN is defined as a 10-digit NANP format number. It is equivalent in all respects to the ELIN as utilized in this Standard. 5.2.5.4 Transmitted Callback Number Included in the SETUP message for an Enhanced 911 call is the Calling Party Number (Charge Number) IE that contains the “callback number” to the caller or, if applicable, to the station(s) located in the respective ERL. 5.2.5.5 911 Call Hold When a 911 call is connected using an ISDN trunk interface, the PSTN