1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-0100302.1989(R2011) Digital Processing of Voice-Band Signals Line Format for 32 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM) ATIS is the leading technical planning and standards development organization committed to the rapid deve
2、lopment of global, market-driven standards for the information, entertainment and communications industry. More than 250 companies actively formulate standards in ATIS 18 Committees, covering issues including: IPTV, Service Oriented Networks, Energy Efficiency, IP-Based and Wireless Technologies, Qu
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5、ICAN NATIONAL STANDARD Approval of an American National Standard requires review by ANSI that the requirements for 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, s
6、ubstantial agreement has been reached by directly and materially affected interests. Substantial agreement means 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 resoluti
7、on. The use of American National Standards is completely voluntary; their existence does not in any respect preclude 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 Ameri
8、can National Standards Institute does not develop standards and will in no circumstances give an interpretation 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 St
9、andards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears 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 CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time.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 Institut
10、e require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Notice of Disclaimer 32; and 4O-kbitls Adaptive Diff
11、erential Pulse-Code Modulation (ADPCM), ANSI T1.303-1989. This standard, together with ANSI T1.303-1989, supersedes American National Standard for l?zlecommunications - Digital Processing of Voice- Band Signals - Algorithm and Line Format for 32-kbit/s Adaptive Differential Pulse- Code Modulation (A
12、DPCM), ANSI T1.301-1987. It is expected that equipment manufacturers and carriers will utilize both ANSI T1.302-1989 and T1.303-1989. Suggestions for improvement of this standard wiIl be welcome. They should be sent to the Exchange Carriers Standards Association, 5430 Grosvenor Lane, Bethesda, MD 20
13、814. This standard was processed and approved for submittal to ANSI by Accredited Standards Committee on Telecommunications, Tl. Committee approval of the standard does not necessarily imply that all members voted for its approval. At the time it approved this standard, the Tl Committee had the foll
14、owing members: Ivor N. Knight, Chair Arthur K. Reilly, Vice-Chair 0. J. Gusella, Secretary Organization Represented EXCHANGE CARRIERS Alltel Service Corporation. . . . . . . . . . . . . . . . . Ameritech Services, Inc. . . . . . . . . . . . . . . Bell Atlantic . . . . . . . . . . . . . . . . . . . .
15、 . . . Bellcore . . . . . . . . . . . . . . . . . . . . . . . . . . . . BellSouth Services . . . . . . . . . . . . . . . . . Centel Corporation. . . . . . . . . . . . . . Cincinnati Bell Telephone. . . . . . . . . . . . . . Contel Corporation. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Name of Representative John B Kohut Timothy D. Timmons Robert Koren (Ah) John w Seazholtz Roger Nucho (Ah) Ian M Lifchus Martin T. Sullivan (Ah) Leonard Strickland, Jr Wiiam J. McNamara, III (Ah) Joseph J Olejar, III James W. Weit
17、h (Ah) William P Keidel Russell G. Dewitt Stephen P Welsh (Ah) Organization Represented Exchange Carriers Standards Association . GTE SC/Telephone Operations . National Telephone Cooperative Association NYNEX Service Company Pacific Bell . . . . . . . Puerto Rico Telephone Company . Southern New Eng
18、land Telephone Southwestern Bell Telephone Company . Telephone W$oJr WI Ted Eiselen (Ah) Robert DiMeo Henry Lowe (Ah) Allen Adams Kishan Shenoi (Ah) J R. Kennedy Ron Murphy (Ah) David Breeding Guy Campbell (Ah) Stephen V. Lyle Steven A. Minneman Roger Pandanda (Ah) Frederick Cronin Thomas Thompson (
19、Ah) Organization Represented GTE Communication Systems Corporation Harris Corporation Hekimian Laboratories, Inc Hewlett-Packard Honeywell Bull IBM Corporation Integrated Technology. Inc LICOM, Inc Mite1 Corporation Motorola, Inc Myriad Concepts, Inc NEC America, Inc Northern Telecom, Inc Paradyne C
20、orporation Plantronics, Inc Poynting Corporation Racal-Milgo, Inc . . Rockwell International Corporation Siemens Communication Systems, Inc Stromberg-Carlson Corporation . . Telco Systems, Inc. Telecom Solutions . . Telecommunications Techniques Telex Computer Products, Inc TELINQ Systems, Inc Timpl
21、ex, Inc . . . Unisys US Telecommunications Suppliers Association Verilink Corporation Videoconferencing Systems, Inc. GENERAL INTEREST American Broadcasting Company Ashford Associates BDM Corporation Carter Hawley Hale Information Service CBS Broadcasting Group, CBS, Inc Creative Communications Cons
22、ulting, . . . Name of Representative Nigel J E Reynolds Brian Jones David Cox (Alt) Larry E Keith Mike F Toohig (Alt) Don C Iouahrv Richard van-Gilder (Alt) Robert F Stover Robert M Amy Ronald C Kunzelman (Alt) Mark Lanning Dave Hensley (Alt) Maynard Graden, III Carl Engineer (Alt) Keith Richardson
23、David Gleave (Ah) G David Forney, Jr David Morgan (Alt) Michael Kelly Michael Shepperd (Ah) Wayne Lohman Art Graham (Alt) David R Cairns Vie Boersma IAltl R K Smith Wayne Moore (Ah) M. Farrant Brian Cole (Ah) Kamal I Parikh Howard T Mason (Ah) Donald OConnor lack Stephenson (Alt) James T- Carter, jr
24、 Everett Itrrvev (Ah1 . . . . . Michael A Pierce Dan R Mondor (Ah) Roger Lanham Ron Kandell (Alt . H. A. Carries. Marshall Hudson IAltl M J Narasimha Richard T. Bobilin (Alt) . . Joseph A. Sciulli Bernard E Worne (Alt) Frederick Skoog Douglas Kendrick (Alt) Ieff Foust Robert Felice (Ah) Shiv Verma P
25、aul Lue (Ah) Stanley D. Fenner Marvin Bass (Alt) Michael J Birck Paul DeLuca (Alt) William J Buckley John Nuwer Ken Hutchison (Alt) Howard Meiseles Ken Michel (Alt) Donald A. Ashford Roy Bernd James A. Rothenberger Vie Accettura (Ah) Stavros Hilaris Joseph McNulty (Alt) Richard Bobilin James Boe (Al
26、t Organization Represented Defense Communications Agency Federal Express Corporation Martin-Marietta - Information and Communications National Broadcasting Company National Bureau of Standards National Communications System National Telecommunication 32-, and 40-kbit/s Adaptive Differential Pulse-Co
27、de Modulation (ADPCM) ANSI T1.501-1988, Telecommunications - Net- work Performance - l%ndem Encoding Limits for 32-kbit/s Adaptive Differential Pulse-Code Modulation (ADPCM) 2.2 Other Referenced Standards This standard is also intended to be used in conjunction with the following standards. CCITT Re
28、commendation G.711, Pulse Code Modulation (PCM) of Voice Frequencies, Red Book Volume III, Fascicle 111.3, pp 85-93 CCITT Recommendation G.721, 32 kbit/s Adap- tive Differential Pulse Code Modulation (ADPCM), Red Book Volume III, Fascicle 111.3, pp 125-15Q1 3. Transcoders Using Bundle Format This se
29、ction concerns 48-channel transcoders us- ing channel-associated signaling where the signal- ing bits are transported in signaling channels called delta channels. This signaling is called the Bundle Format. 1 Available from: American National Standards Institute, 1430 Broadway, New York, NY 10018, (
30、212) 642-4995 3.1 Characteristics of a 1544-kbit/s Signal Organized in 32-kbit/s Time-Slots, 64-kbitls Time-Slots or Both (Port Z) 3.1.1 Interface Z. The electrical characteristics of the 1544-kbit/s interface shall be in accordance with ANSI T1.102-1987. 3.1.2 Frame Structure. The 1544-kbit/s signa
31、l is organized in frames of 193 bits. The frame repetition rate is 8000 Hz. Each frame is com- prised of forty-eight 4-bit time-slots, numbered from 1 to 48, plus the framing bit in the first bit position The bit ordering of the 32-kbit/s signals is such that the 4-bit words are transmitted in numbe
32、red order starting with bit 1, the sign bit, as specified in 2.2.3 and 2.2.4 of CCITT Recom- mendation G.721. 3.1.2.1 DSl Frame and Multiframe Alignment Signal. The first bit conveys the DSl frame alignment signal and multiframe alignment signal, as specified in ANSI T1.107-1988 for the 24-frame mul
33、tiframe and the 12-frame mul- tiframe. Selection of either the 24-frame mul- tiframe or 12-frame multiframe format at port Z is independent of frame formats selected at ports X and Y. 3.1.2.1.1 24-Frame Multiframe. The F-bit shall be used for transport of framing and CRC-6 information, as defined in
34、 ANSI T1.107-1988. The use of the F-bit for transport of the 4-kbit/s data link, as defined in ANSI T1.107-1988, is a subject for further study. 3.1.2.1.2 12-Frame Multiframe. The frame alignment signal occupies the first bit posi- tion of every other frame, as defined in ANSI T1.107-1988. The S-bit
35、 is used to carry the mul- tiframe alignment signal, as defined in ANSI T1.107-1988. The S-bit is in the frames that do not carry the frame alignment bits. 3.1.2.2 Loss and Recovery of Frame and Multiframe Alignment. The criteria for loss and recovery of the frame alignment and mul- tiframe alignmen
36、t signal for port Z shall be in ac- cordance with ANSI T1.107-1988 for the 24-frame multiframe and the U-frame multiframe. 3.1.2.3 48-Channel Frame Format. In the case in which streams X and Y are each carrying 24 voice-frequency signals and no channel- associated signaling information is present, s
37、tream Z shall transmit the full complement of 48 channels. Table 1 shows the correspondence between the 64-kbit/s PCM channels in streams X and Y and the 32-kbit/s ADPCM channels in stream Z. Time-slots l-12 correspond to chan- nels l-12 from PCM stream X coded with 12 AMERICAN NATIONAL STANDARD Tl3
38、02-1989 4 bits. Time-slots 13-24 correspond to channels 13-24 from PCM stream X coded with 4 bits. Time-slots 25-36 correspond to channels l-12 from PCM stream Y coded with 4 bits. Time- slots 37-48 correspond to channels 13-24 from PCM stream Y coded with 4 bits. 3.1.2.4 384-kbit/s Bundle Format. T
39、he or- ganization of the 1544-kbitls stream associated with port Z is structured to provide four in- dependent 384-kbitls bundles. The bundles are numbered I-4, and are transmitted in numbered order starting with bundle 1. As shown in Table 1, each 384-kbitls bundle consists of twelve 32-kbit/s time
40、-slots providing the capacity to transport up to twelve 32-kbit/s voice frequency channels. When channel- associated a-b-c-d signaling is present in X and Y, the 384-kbitfs bundle will consist of eleven 32-kbitls channels and a 32-kbitls channel de- fined as the delta channel. 3.1.2.4.1 Delta Channe
41、l. The delta chan- nel conveys the channel-associated a-b-c-d signal- ing information, the delta channel alarm informa- tion, the delta channel multiframe alignment sig- nal and CRC-6 error detection information be- tween transcoders. The delta channels for bundles l-4, when present in stream Z, occ
42、upy time-slots 12, 24, 36, and 48, respectively. As shown in Table 2, the channel capacity for stream X (respectively, Y) is reduced by one for each bundle associated with stream X (respectively, Y) configured with a delta channel. Selection of the bundle format to in- clude the delta channel is mad
43、e on a per-bundle basis, independent of the other bundles associat- ed with stream X or Y. 3.1.2.4.2 Unused Channels. As explained in 3.1.2.4, the presence of a delta channel in a bundle causes a given channel in stream X or Y to be configured as unused. The unused channels on the receive side of st
44、reams X and Y shall have their data condi- tioned in a way compatible with downstream equipment; for example, unequipped channel re- quirements shall be as defined in ANSI T1.107-1988 for channel banks. For unused channels, the channel-associated signaling bits on the receive side of streams X and Y
45、 shall be set to 1 to simulate the seized condition. The unused channels on the send side of streams X and Y are not processed. 3.1.2.5 Delta Channel Multiframe Structure. A delta channel is allocated 4 bits per frame, providing for a 32-kbit/s channel. The bits are numbered 1 through 4 and are tran
46、smitted in order starting with bit number 1. The delta chan- nel multiframe consists of 24 consecutive frames numbered from 1 to 24. The channel-associated a-b-c-d signaling infor- mation is carried in bits 1 and 2. The delta chan- nel alarm indication information is carried in bit 2. The delta chan
47、nel multiframe alignment signal is carried in bit 3. The bundle CRC-6 error detec- tion information is carried in bit 4. Capacity is reserved in bit 4 for future uses such as data links. Table 3 shows the delta channel format includ- ing bundle alarm bits. In the case where no delta channel is provi
48、ded, the strategy for responding to alarm conditions is for further study. 3.1.2.5.1 Channel-Associated Signaling. As indicated in Table 3, bits 1 and 2 of the delta channel convey the channel-associated signaling information present in all the channels of the as- sociated bundle. The delta channel
49、does not allo- cate bandwidth for the unused channel that is usurped by its presence. The delta channel provides bandwidth for 16-state a-b-c-d signaling. Where only a-b signal- ing is present, the a-b signaling is repeated in the c-d signaling bits, respectively. No additional sig- naling distortion is introduced in stream Z since the delta channel signaling multiframe length is identical to the signaling multiframe length for ports X and Y. 3.1.2.5.2 Delta Channel Alarm Indication Signals. As indicated in Table 3, the delta channel contains three alarm indication bits (Ml,
