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                              Draft 01

                     ANSI/TIA-470.??? -C



                      Telecommunications

             Telephone Terminal Equipment

Telephone Answering Devices Performance Requirements




         Formulated under the cognizance of TIA Subcommittee TR-41.3,
                     Analog and Digital Wireline Terminals

            With the approval of TIA Engineering Committee TR-41,
               User Premises Telecommunications Requirements
(To be published as ANSI/TIA-470.???-C)                                          SP-?????????


The TR-41.3.12 Working Group acknowledges the contributions made by the following individuals
in the development of this standard.

                                                                                 Position
           Name                            Representing
                                                                             (If Applicable)




The TR-41.3.10 Working Group, which had the technical responsibility during the development of
this standard, had the following participating members.
                                                                                  Position
             Name                               Representing
                                                                              (If Applicable)




                                              i
(To be published as ANSI/TIA-470.???-C)                     SP-?????????


                                                             Position
           Name                           Representing
                                                         (If Applicable)




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     TR41.3.12 Telephone Answering Device Working Group Meeting Participants
(This list will be replaced in the Standard with a list of Contributors & Participants)
 Working Group            Organization                             Meetings Attended
    Member                 Represented                  (C= Contribution, A= Attended Meeting)




                                                      Aug, 2005- Halifax
   Roger Hunt              Atlinks                          A

    Al Baum                Uniden                           A

  Jimmy Smith             Wyle Labs                         A

 Ken Macdonald           Microtronix                        A

  Dave Stenner        Advent Instuments                     A

  James Bress        AST Technology Labs              C,A

   Amar Ray                 Sprint                    C,A




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                                                   TABLE OF CONTENTS
1        SCOPE ___________________________________________________________________ 1
2      REFERENCES ____________________________________________________________ 2
    2.1 NORMATIVE REFERENCES ....................................................................................................... 2
    2.2 INFORMATIVE REFERENCES ..................................................................................................... 2
3      ABBREVIATIONS, ACRONYMS, AND DEFINITIONS _________________________ 4
    3.1 ABBREVIATIONS AND ACRONYMS ........................................................................................... 4
    3.2 DEFINITIONS ............................................................................................................................ 5
4      TECHNICAL REQUIREMENTS _____________________________________________ 7
    4.1 CATEGORIES OF CRITERIA ....................................................................................................... 7
    RING DETECTOR PERFORMANCE: ...................................................................................................... 7




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                                     Table of Figures
ERROR! NO TABLE OF FIGURES ENTRIES FOUND.




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                                        Table of Tables
Error! No table of figures entries found.




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 1   1   SCOPE
 2   This standard provides telephone answering device performance requirements for Customer Premises
 3   Equipment (CPE) intended for analog wireline connection to the Public Switched Telephone Network
 4   (PSTN). These requirements should ensure compatibility and satisfactory performance to the user in
 5   a high percentage of installations.
 6
 7   This document proposes or references at least one measurement procedure for each technical
 8   requirement. However, these procedures are not exclusive. Any measurement procedure and
 9   equipment that can result in an identical measurement is considered valid.
10
11   While the procedures may call out specific test points within the requirements, the full range of the
12   requirements take precedent.
13   {NOTE: ETSI TAD documents should be consulted}




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14   2     REFERENCES
15   The following standards contain provisions, which, through reference in this text, constitute
16   provisions of this standard. At the time of publication, the editions indicated were valid. All
17   standards are subject to revision, and parties to agreements based on this standard are encouraged to
18   investigate the possibility of applying the most recent editions of the standards indicated below.
19   ANSI and TIA maintain registers of currently valid national standards.
20
21   2.1     NORMATIVE REFERENCES
22   1. ANSI/IEEE Std 1329-1999 – Standard Method for Measuring Transmission Performance of
23         Handsfree Telephone Sets
24   2. ANSI/IEEE Std 269-2002 – Standard Methods for Measuring Transmission Performance of
25         Analog and Digital Telephone Sets, Handsets and Headsets
26   3. ANSI S1.4-1983 (Reaff. 2001) – Specification for Sound Level Meters
27   4. TIA/EIA-504 – Magnetic Field Intensity Criteria for Telephone Compatibility with Hearing
28         Aids.
29   5. IEEE Std 743-1995 – IEEE Standard Equipment Requirements and Measurement Techniques for
30         Analog Transmission Parameters for Telecommunications
31   6. ITU-T Recommendation O.41 (94) –Psophometer for use on telephone-type circuits
32   7. ITU-T Recommendation P.57 (2002) – Artificial Ears
33   8. ITU-T Recommendation P.64 (1999) – Determination of Sensitivity/Frequency Characteristics
34         of Local Telephone Systems.
35   9. ITU-T Recommendation P.79 (1999) – Calculation of Loudness Ratings for Telephone Sets
36   10. 47 CFR Part 68 – Code of Federal Regulations (CFR), Title 47, FCC Part 68, Connection of
37         Terminal Equipment to the Telephone Network.
38

39   2.2     INFORMATIVE REFERENCES
40   ANSI/TIA-464-C-2002 – Requirements for PBX Switching Equipment.
41   ANSI/TIA-464-C-1-2004 – Requirements for PBX Switching Equipment, Addendum.
42   ANSI/TIA/EIA-810-A-2000 – Transmission Requirements for Narrowband Voice over IP and Voice
43         over PCM Digital Wireline Telephones.
44   ANSI/TIA-968-A-2002        –     Telecommunications   Telephone   Terminal   Equipment     Technical
45         Requirements for Connection of Terminal Equipment to the Telephone Network
46   ANSI/T1.508-2004 – Loss Plan for Evolving Digital Networks.
47   TIA-912-A-2004 – Voice Gateway Transmission Requirements.
48   TIA-920-2002 – Transmission Requirements for Wideband Digital Wireline Telephones.


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49   ITU-T Recommendation G.101 (2003) – The transmission plan.
50   ITU-T Recommendation P.58 (1996) – Head and Torso Simulator for Telephonometry
51   UL 60950-1 Issue 3 (2003) - Information Technology Equipment - Safety - Part 1: General
52      Requirements
53




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54   3     ABBREVIATIONS, ACRONYMS, AND DEFINITIONS
55   3.1    ABBREVIATIONS AND ACRONYMS
56   For the purposes of this standard, the following abbreviations and acronyms apply.
57   AWG         American Wire Gauge
58   CPE         Customer Premises Equipment
59   DRP         Drum Reference Point
60   ERP         Ear Reference Point
61   HATS        Head And Torso Simulator
62   MRP         Mouth Reference Point
63   OLR         Objective Loudness Rating
64   ONS         On premises station
65   OPS         Off premises station
66   PSTN        Public Switched Telephone Network
67   PBX         Private Branch Exchange
68   RETP        Receive Electrical Test Point
69   RLR         Receive Loudness Rating
70   ROLR        Receive Objective Loudness Rating
71   SETP        Send Electrical Test Point
72   SLR         Send Loudness Rating
73   SOLR        Send Objective Loudness Rating
74   T&R         Tip and Ring terminals or interface
75   THD         Total Harmonic Distortion
76   TOLR        Transmit Objective Loudness Rating
77




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 78   3.2     DEFINITIONS
 79   For the purposes of this standard, the following definitions apply.
 80   +12 dB Volume Control Setting:             The setting at which the measured RLR with 0 km, 2.7 km,
 81                            and 4.6 km artificial lines, is closest to, but not less than, 12 dB louder than
 82                            the RLR at the Reference Volume Control Setting.
 83   Central Office:          Used broadly to describe the switch connected to a subscriber’s line.
 84   CPE State:               The condition of the telephone device. It can be either On-Hook or Off-
 85                            Hook.
 86   dBA:                     Sound pressure level in decibels, relative to 210-5 Pa, using A-weighting.
 87                            (See Error! Reference source not found.)
 88   dBm:                     Power level in decibels, relative to a power of 1 mW (milliwatt).
 89   dBmp                     Power level in decibels, relative to a power of 1 mW, using psophometric
 90                            weighting. (See Error! Reference source not found.)
 91   dBPa:                    Sound pressure level in decibels, relative to a sound pressure of 1 Pa (pascal).
 92   dBV:                     Voltage level in decibels, relative to 1 volt rms.
 93   End Office:              A central office to which an end user telephone is connected.
 94   Listening-Path:          The path from electrical signals at the RETP to acoustic signals at the CPE
 95                            receiver/speaker.
 96   Mouth Reference Point (MRP):           A point on the axis of the mouth simulator, 25 mm in front
 97                        of the center of the equivalent lip plane.
 98   Off-Hook:                The state of the CPE when the hook-switch is closed. Refers to the state of a
 99                            particular CPE rather than the line state.
100   On-Hook:                 The state of the CPE when the hook-switch is open. Refers to the state of a
101                            particular CPE rather than the line state.
102   Off-hook noise:          The internally generated noise of the telephone set.               It is the
103                            psophometrically weighted signal power delivered to a specified termination
104                            (SETP) in the absence of an acoustic input into the telephone set.
105   Reference Volume Control Setting: The quietest volume control setting that complies with the
106                       RLR requirement at 0 km, 2.7 km, and 4.6 km artificial lines.
107   Talking-Path:            The path from acoustic signals at the CPE microphone to electrical signals at
108                            the SETP.
109   Nominal LR               The loudness rating used for network loss planning.
110   Telephone set:           A device that facilitates two-way voice communication between persons over
111                            the public switched telephone network. A telephone set consists of:
112                                        o    A transmitter and a receiver that perform the conversions
113                                             between acoustical energy and electrical energy.
114                                        o    A speech network that couples the transmitter and receiver
115                                             circuits to the telephone line.
116                                        o    A hookswitch that opens and closes electrical contacts to
117                                             indicate the status (off-hook or on-hook) of the telephone set
118                                             to the central office switch.
119                                        o    A network-addressing unit, which generates dial pulses or
120                                             DTMF signals.



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121                                      o   An alerting device that produces a signal to indicate an
122                                          incoming call attempt on the telephone line.
123   Total Harmonic Distortion (THD):      The ratio of the square root of the sum of all of the squared
124                        second, third, and higher harmonics to the magnitude of the fundamental.
125                          For this document THD is calculated as a percentage using the second and
126                          third harmonics. The formula is:

                                                   H 2 ( f )2  H 3 ( f )2
127                           % THD  100
                                                            H1 ( f )
128                          where:
129                          H1(f) is the amplitude of the fundamental at frequency f.
130                          H2(f) is the amplitude of the second harmonic at excitation frequency f.
131                          H3(f) is the amplitude of the third harmonic at excitation frequency f.
132
133




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134   4     TECHNICAL REQUIREMENTS
135   4.1   CATEGORIES OF CRITERIA
136   Four types of requirements are specified in this standard: Mandatory, Recommended, Permissive and
137   Advisory:
138         1. Mandatory requirements are designated by the terms “shall” and “shall not.” These
139             requirements are used to indicate conformity in which no deviation is permitted.
140         2. Recommended requirements are designated by the terms “should” and “should not.”
141            These requirements generally relate to compatibility or performance advantages towards
142            which future designs should strive.
143         3. Permissive requirements are designated by the terms “may” and “may not.” These
144            requirements are used to indicate an action that is permitted within the limits of the
145            standard.
146         4. Advisory requirements are designated by the term “desirable.” Advisory criteria
147            represent product goals or are included in an effort to ensure universal product
148            compatibility and may be used instead of a Recommended requirement. If both a
149            mandatory and an advisory level are specified for the same criterion, the advisory level
150            represents a goal currently identifiable as having distinct compatibility or performance
151            advantages toward which future designs should strive.
152
153
154
155   RING DETECTOR PERFORMANCE:
156   Point to TIA 470.220-C for electrical and timing requirements.
157   Handle cadenced ringing for counting
158   Toll saver feature
159   Audible alerting is not required
160   RING TIMER RESET:
161   Ring counter should reset after no ringing for 6 sec. (+/- 200 ms).
162
163   RESISTANCE AND IMPEDANCE PERFORMANCE:
164   Point to TIA 470.210-C.
165
166   GENERAL:
167   Need to specify the test interface simulator to be used.
168   Need to specify if to use loops or not for testing for AC and DC considerations.
169
170   BASIC FREQUENCY RESPONSE and Speech Quality:
171   Record OGM and ICM and measure the Acoustic playback level. (local playback)
172   Also need to test remote listening of OGM and ICM
173                     -   Speaker playback
174                     -   Handset playback (integrated set)
175                     -   Far-end remote playback
176                     -   May consider using PESQ or PSQM but need a detailed contribution. This



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177                         may only be applicable for electrical only (not acoustic) (i.e., OGM and remote
178                         ICM playback.
179
180   ICM VOX PERFORMANCE:
181   Delay allowed: 10 Seconds, +/- 3 seconds?
182   Recognizes Timed Disconnect Signal (TDS)? ------ If yes, then longer VOX allowed?
183   Should detect TDS during OGM and ICM
184   Should it detect dial tone or other tones for VOX time-out
185   Should we consider rejecting/abandoning very short messages (e.g., just a “click”) or messages with
186   only dial tone or other “non-message” recordings
187   What to do with ICM if a EIU is detected during the ICM recording
188   What about legal issues of recording conversations (Roger Hunt to inquire with internal legal
189   regarding this issue).
190   Need spec for determining silence
191
192   ICM SPEECH/ TONE LEVEL DETECTION THRESHOLD:
193   Test signals –28 to –61 dBm?
194   Record threshold should be a minimum –43 dBm?
195
196   DTAM PARALLEL PHONE DISCONNECTS VOLTAGE THRESHOLD:
197   Requires basic test matrix, 100 to 400 ohm parallel load?
198
199   CPE 0EE-HOOK TRANSITION AND ICM DISCONNECT:
200   Must stop ICM recording, < 500 ms?
201
202   IGM AND ICM PLAY AND RECORD TIMING:
203   ICM recording should start after beep following OGM?
204
205   OGM AND ICM RECORD DURATIONS:
206   User control, ICM announcement of record time?
207
208   DEFAULT OGM REQUIREMENTS:
209   Required. (Could be just a beep)?
210
211   OGM BEEP FREQUENCY, AMPLITUDE, DURATION:
212   Important to make it work for telemarketing systems to automatically disconnect call
213   1KHz signal is an ETSI requirement (Amar)?
214
215   MUTE OF MICROPHONE TO LINE:
216   Verify microphone is muted during any TAM operations except for OGM recording?
217


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218   ICM AND OGM RECORD AND PLAYBACK LOSS/GAIN ANALYSIS:
219   Per Bellcore Loop Survey test signals –13 to –43 dBm?
220   Playback should be between –9 (ACTA Max) to –29 dBm?
221          See TSB-31B/C for the general test method
222          Need test method for getting test signals from OGM and ICM into the TAD for playback.
223
224   ICM AND OGM LOCAL PLAYBACK ELECTRICAL AMPLITUDE LIMITS:
225   Record a 0 dBm electrical signal (ICM) and a +5.3 dBPa Acoustic signal (ICM)?
226   Playback shall be less than –9 dBm(ACTA Max)?
227
228   ICM & OGM FREQUENCY RESPONSES:
229   Should follow the Handsfree spec?
230
231   ACOUSTIC PLAYBACK VOLUME CONTROL:
232   During ICM listen (live and preset)?
233
234   OGM ANNOUNCEMENT RECORD TEST SEQUENCE:




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                             OGM announcement record test sequence
                Announcement
               option turned on              Line selected




                  A. M
                                                A.M. gives a beep indicating that the
                                                    A. M. is ready for recording

                  A.M.

                                                    The T. S. Turned on

                  T.S                                                              The T. S. plays
                                                                               announcement (speech
                                                                                 signal) through the
                                                                                   Artificial Mouth
                 T.S.
                                                                              A. M. records that through
                                                                                   the Microphone

                A. M
                                                                                A. M. recording option
                                                                                       turned off

                 A. M                                                                       A. M. turned off
                                                  A. M. Plays back the
                                                     announcement
                A. M

                                                    T. S. verifies the
                                                    announcement
                 T.S.



                              10   20   30                   60          85    95                  135 140
                                                  45
              Time in    0
                Sec           T1   T2 T3       T4 T5      T6             T7 T8 T9                 T10 T11
                                              A.M. - Answering Machine
                                              T. S. - Test system
235
236
237   ACOUSTIC ANNOUNCEMENT RECORD SEQUENCE:
238   ???
239
240   ANNOUNCEMENT PLAYBACK ON TIP & RING:
241   ?????
242



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      (To be published as ANSI/TIA-470.???-C)        SP-?????????


243   REMOTE CONTROL ANNOUNCEMENT RECORD SEQUENCE:
244   ?????
245
246   RECORD INCOMING MESSAGE SEQUENCE:
247




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                         Incoming Message Record Test Sequence


                                                 T.S. calls A.M.
                                         Number of rings is programmable
                  T. S.
                                                A.M. picks up after preset number of
                                                                rings

                  A.M.
                                                            A.M. Plays back OGM (Outgoing
                                                                       Message)

                  A.M.

                                                        T.S. Verifies the OGM


                  T.S.

                                                              A. M. generates beep

                 A. M

                                                                T. S. detects & measures
                                                                         the beep
                  T.S.
                                  T.S. generates the
                                    ICM (Incoming
                                       Message)
                T. S.
                                                                                ICM number should
                                 A.M. records the ICM                              go up by one

                 A.M.

                            10   20                            60          90 95
               Time in 0
                 Sec
                                   T
                           T1 T2T3T4 5              T6 T7T8T9             T10 T11
                                               T. S. - Test system
248                                         A.M. - Answering Machine
249
250   REMOTE CONTROL INCOMING MESSAGE PLAYBACK SEQUENCE:
251   ?????
252
253   DIALTONE (AND OTHER CUTOFF TONES) CUT-OFF TEST SEQUENCE:


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254   ?????
255
256   SILENCE CUT-OFF TEST SEQUENCE:
257   ?????
258
259   REMOTE ACCESS FEATURE:
260   Require a specific minimum set of features?
261
262   REMOTE ACCESS OPERATION:
263    Does VOX turn off?
264   Immunity to OSI / LR (Type 2 call interruption).
265   DTMF receiver, see below.
266
267   CONFIRMATION TONE LEVELS AND FREQUENCIES:
268    Transmitted Confirmation tones should be between –15 and –25 dBm?
269   Confirmation Tone Frequency should be between 500 to 1000 Hz?
270
271   ANSWERING MACHINE SUBJECTIVE MEASUREMENTS:
272   ICM and OGM Subjective Acoustic Performance (Objective test levels)
273   Place into document or an Annex?
274
275   ANSWERING MACHINE RESPONSE TO OPEN SWITCH INTERVALS, LINE
276   REVERSALS AND TIMED DISCONNECT SIGNAL:
277
278   TIMED DISCONNECT TEST:
279   During OGM and ICM, should detect and release the line?
280
281   OSI TESTS:
282   During OGM and ICM, should ignore single and multiple OSIs. VOX should not be extended or
283   record message due to OSI?
284
285   LINE REVERSALS TESTS:
286   During OGM and ICM, should ignore LR. VOX should not be extended or record message due to
287   LR?
288
289   Performance ANSWERING MACHINE DTME RECEIVER PERFORMANCE:
290
291   FREQUENCY LIMITS:
292   Should accept DTMF signals with 1.5% tolerance?



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293
294   AMPLITUDE:
295   Should accept DTMF signals down to –45 dBm?
296
297   TWIST:
298   Should accept DTMF signals with +12 dB and –6 dB of twist?
299
300   DURATION:
301   Should accept DTMF signals with a minimum duration of 40 ms?
302
303   INTER-DIGITS DELAY:
304   Should accept DTMF signals with a minimum Inter-Digit Delay of 50 ms?
305
306   VOICE BAND NOISE IMMUNITY (EXTRANEOUS SIGNALS):
307   Should accept DTMF signals with +16 dB SNR for voice band signals?
308
309   60 Hz NOISE IMMUNITY:
310   Should accept DTMF signals with +25 dB SNR for 60 Hz related signals?
311
312   DTMF TALKOFF (FALSE DTMF DETECTION):
313   TBD
314
315   DTMF RECEIVER INTER-DIGIT TIMEOUT:
316   For multi-digit codes require a short timeout (2 sec.?) between digits to improve code talkoff
317   immunity.
318
319   DTMF TALKDOWN (MISSED DTMF DETECTION):
320   TBD
321
322   ANSWERING MACHINE ENVIRONMENTAL:
323   Lightning, ESD, Power, environmental, etc………
324   Point to TIA-571
325
326   ANSWERING MACHINE FEATURE SPECIFIC REQUIREMENTS:
327
328   VMWI INDICATOR:
329
330   PARALLEL SET OFF-HOOK:
331


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332   AUTO TOLL-SAVER MODE:
333
334   SILENCE CUT-OFF:
335
336   MAILBOX RECORDING SPACE INFORMATION:
337   Announcement of full mailbox Display, announce amount of recording time left.
338
339   CALL COUNTER VERIFICATION:
340   CPE should handle counting recorded messages with changes due to new and deleted messages.
341
342   REMOTE OR LOCAL MESSAGE PLAYBACK, DELETE, AND SAVE:
343   Logical operation verified.
344
345   CLOCK ACCURACY (FOR TIMESTAMPS):
346
347   MEMORY RETENTION AFTER POWER FAILS:
348   OGM, ICM, user set preferences, Call counter, time+date etc.
349
350   MULTI-MAILBOX FEATURES:
351   Need to define feature list.
352   OGM with support for DTMF controlled direction to mailboxes.
353
354   DTAM WITH MULTI-LINES:
355   Should logically separate message per line.?
356   Timing issues between lines for recording and interruption.
357   Crosstalk
358   Separate OGMs possible
359
360
361




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