1、TIAEIA TELECOMMUNICATIONS SYSTEMS BULLETIN I APRIL 1997 TELECOMMUNICATIONS INDUSTRY ASSOCIATION STD-EIA TSB83-ENGL 1977 m 323Lib00 0581770 733 m NOTICE MIA Engkzing Standards and Publications are designed to serve the public interest through eliminating- dings between manufacturers and purchasers, f
2、acilitating interchangeability and inproveraieon of products, and assisting the purchaser in selecting and obtaining with minimum delay the prop product for his particular need. Existence of such Standards and Publications shall not in any respect preclude any member or nonmember of TLA/EIA from man
3、ufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such Standards and Publications preclude their voluntary use by those other than TIA/EIA members, whether the standard is to be used either domestically or internationally. Standards, Publica
4、tions and Bulletins are adopted by TINEIA in accordance with the American National Standads Institute (ANSI) patent policy. By such action, TMIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard, Publication or Bulletin. Te
5、chnical Bulletins are distinguished from TIAEIA Standards or Interim Standards, in that they contain a compilation of engineering data or information usefiil to the technical community, and represent approadies to good engineering practices that are suggested by the formulating committee. This Bulle
6、tin is not intended to preclude or discourage other approaches that similarly represent good engineering practice, or that may be acceptable to, or have been accepted by, appropriate bodies. Parties who wish to bring other approaches to the attention of the formulating committee to be considered for
7、 inclusion in future revisions of this Bulletin are encouraged to do so. It is the intention of the formulating committee to revise and update this Bulletin from time to time as may be occasioned by changes in technology, industry practice, or government regulations, or for other appropriate reasons
8、. (From Project No. 3798, formulated under the cognizance of the TIA TR-45.1 Analog Cellular Equipment Subcommittee.) Published by QTELECOMMUNICATIONS INDUSTRY ASSOCIATION 1997 Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 PRICE: Please refer to the current Catalog of
9、 EIA, JEDEC and TIA STANDARDS and ENGINEERING PUBLICATIONS International (303-397-7956) or call Global Engineering Documents, USA and Canada (1-800-854-7179) Ail rights reserved Printed in U.S.A. STD-EIA TSB83-ENGL 1777 323qb00 0581971 b7T M TSB-83 introduction This TSB describes two optional modems
10、 for information communication between personal base (PB) equipment and Authorization 81 Call muting Equipment (ACRE): Bell 212 and higher-speed transmission modems. These modems will be included in any future revision of IS680 Personal Base Station - Authorization and call Routing Equipment Compati
11、bility Stdd The foiiowing applies to Bell212 modem implementationn on either a PB or =. Bell 212 Bell 212 is a proprietary standard. The material in this section is considered to be sufficient for the implementation of signaling across this interface. Unless otherwise specified, ail timing and signa
12、iing formats are the same as bi-directional Bell 202-type transmission. Bell 212 transmission format Information is transmitted asynchronously at 1200 bps (600 baud). Data is transmitted 8 bits at a time (Least Significant Bit of each byte first) with no parity, one start bit, and one to three stop
13、bits. QPSK modulation is utilized. The fiequency/phase shift assignment is as foiows: Carrier Frequencies I Originate End I Terminate I I I End I - Tx frequency 1200 Hz 2400 Hz Rx frequency 2400 Hz 1200 Hz Message (2 bits) I Phase Angle o11 900 10 180“ 11 270 Bell 212 transmission levels Same as Bel
14、l 202 (see 2.1.2.2.2). Bell 2 12 transmitter enable Same as Bell 202 (see 2.1.2.2.3). Bell 212 transmitter disable 1 STD-EIA TSB83-ENGL 1797 3234b00 0581972 50b W The following applies to higher-spee modem implementations on a PB or m. Higher-speed modem support Higher-speed modem implementations, s
15、uch as those using V.32 bis, shd be capable of automaticdy falling back to Bell 212N.22 operation. The reader is referred to ITU-T Recommendation V.32 bis-1991 for further information on this modem and for information on auto fdback (Annex A.). Other higher-speed modems can be implemented as long as
16、 the mandatory Bell 212N.22 fallback is supported. Higher-speed modem implementations shaU also aiiow for the service provider to program the modems to connect at a specific rate and protocol, e.g., V.32 bis capable PB set to connect as a Bell 212n.22 modem. . TSB-83 Same as Bell 202 (see 2.1.2.2.4). 2 . I STD-EIA TSBB3-ENGL 1997 m 3234600 0583773 442 m
