CEPT T CS 46-02 E-1986 Multifrequency Signalling System to be Used for Push-Button Telephones (ETSI ETR 206 1995)《要用于按键电话的多频信令系统(ETSI ETR 206 1995)》.pdf
《CEPT T CS 46-02 E-1986 Multifrequency Signalling System to be Used for Push-Button Telephones (ETSI ETR 206 1995)《要用于按键电话的多频信令系统(ETSI ETR 206 1995)》.pdf》由会员分享,可在线阅读,更多相关《CEPT T CS 46-02 E-1986 Multifrequency Signalling System to be Used for Push-Button Telephones (ETSI ETR 206 1995)《要用于按键电话的多频信令系统(ETSI ETR 206 1995)》.pdf(15页珍藏版)》请在麦多课文档分享上搜索。
1、CEPT T/CS*46-02*E = 2326434 0004825 II 0 TCS46-02 Page 1 E Recommendation T/CS 46-02 (Innsbruck 1981, revised at Nice 1985) MULTIFREQUENCY SIGNALLING SYSTEM TO BE USED FOR PUSH-BUTTON TELEPHONES Recommendation proposed by Working Group T/WG 1 1 “Switching and Signalling” (CS) Text of the Recommendat
2、ion adopted by the “Telecommunications” Commission: “The European Conference of Postal and Telecommunications Administrations, considering - that access to the services of the telephone network will be provided by telephone sets equipped with 12 or - that the use of these telephone sets and their si
3、gnalling technique for a simple type of end-to-end data transmission - that the existing CCITT Recommendations on the subject do not yet assure the required standardisation; - that the Administrations are in favour of harmonising telecommunications equipment and systems which could lead to a reducti
4、on in development and manufacturing cost for those industries that provide equipment for several countries, 16 push-buttons as recommended in CCITT Recommendation Q. 1 1 11 for multifrequency signalling; in the international as well as in national networks requires standardisation of the technique t
5、o be used; O recommends the use by the member Administrations of the multifrequency signalling system for push-button telephones (including those of private automatic branch exchanges), conforming with the specifications set out hereafter.” Edition of May 15, 1986 CEPT T/CS*4b-O2*E W 2326434 0004826
6、 3 = O 1. 1.1. 1.2. 1.2.1. 1.2.2. TICS 46-02 E Page 3 BASIC MULTIFREQUENCY PUSH-BUTTON (MFPB) SIGNALLING SYSTEM SIGNALLING SYSTEM PRINCIPLES AND CODING General This section deals with the general characteristics of the signalling system and conforms to CCITT Recommendation Q.23 2. Signal frequencies
7、 and codes Signal frequencies The signal frequencies shall be selected from two separate groups within the speech band (300-3,400 Hz), a low group and a high group, each group providing four signalling frequencies. These frequencies shall be : - low group frequencies: 697, 770, 852 and 941 Hz; - hig
8、h group frequencies: 1,209, 1,336, 1,477 and 1,633 Hz. Signal format Each signal shall consist of two and only two of the signalling frequencies; one frequency from each of the low and high groups. Both frequencies shall be applied simultaneously in parallel across the line. Signal code The 16 discr
9、ete signals shall be allocated as shown in Table 1 (T/CS 46-02) below. 1.2.3. High group frequencies Hr I i209 I 1336 I IL77 I 1633 I I I I Table 1 (T/CS 46-02). Table 1 (T/CS 46-02) gives the full allocation of signal codes. The system may be utilized with only 10 discrete signals, in which case th
10、e signals designated Sc, +I, A, B, C and D will not be used; or with 12 discrete signals, in which case the signals A, B, C and D will not be used. Nute: The presentation in Table 1 (T/CS 46-02) corresponds to the actual lay-out of the push-buttons on the terminal equipment. The arrangements and des
11、ignations of buttons are further specified in Recommendation T/CS 34-01 3. Edition of May 15, 1986 I CEPT T/CS*4b-O2*E 232b414 0004627 5 TICS 46-02 E Page 4 2. 2.1. 2.2. 2.3. 2.3.1. 2.3.2. 2.3.3. 2.3.3.1. 2.3.3.2. 2.3.4. 2.3.5. PUSH-BUTTON SENDER Area of application and general This Section deals wi
12、th the multifrequency sender which is used in push-button telephones. The sender has basically been specified for signalling to the exchange. However, regard has also been taken of the possible use of push-button telephones for end-to-end data transmission when manual operation applies. The requirem
13、ents stated in this section apply to an unregulated generator, i.e. a generator in which the output levels are not controlled by the line current. Operational conditions The sender is expected to operate under varying environmental conditions. (a) A general purpose sender should operate in temperatu
14、re controlled locations and partly temperature controlled locations, i.e. in normal living and working areas as well as entrances, staircases of buildings, factories and industrial plants, etc. The relevant climate conditions are described in Recommenda- tion T/TR 02-06 4. The sender must meet the r
15、equirements within these conditions. (b) A wide temperature range sender should operate in open air as well as sites with heat trap, i.e. telephone booths and similar installations. The relevant climatic conditions are described in Recommen- dation T/TR 02-06, Figure 3 4. The wide temperature range
16、sender must meet the requirements within these conditions. Signal output requirements Frequency tolerance The output frequencies shall be maintained within f 1.5% of their nominal values. This tolerance shall also include the effect of different line impedances offered to the sender. Sending level T
17、he sending levels with a load resistance of 600 ohms shall be for: option 1 - the high frequency group: - 9 dBm +2 dB - the low frequency group: - 11 dBm f 2 dB; option 2 - the high frequency group: - 6 dBm f2 dB - the low frequency group: - 8 dBm +2 dB; with a restriction that the level of the high
18、er frequency component of the compound signal shall be 2 above the level of the lower frequency component. Unwanted frequency components When a signal is output: (a) the total power level of all unwanted frequency components shall be at least 20 dB below the level of the low group frequency componen
19、t of the signal; (b) the level of any individual unwanted frequency component shall not exceed the following limits: - in the frequency band 300-4,300 Hz: -33 dBm; - in the frequency band 4,300-28,000 Hz: -37 dBm at 4,300 Hz, then falling at 12 bB/octave until - in the frequency band 28-70 kHz: -70
20、dBm; - in the frequency band 70-200 kHz: -80 dBm; - in the frequency band above 200 kHz: -70 dBm. 1 dB 28 kHz; When no signal is output, the level of any single frequency emitted from the sender to line shall not exceed -80 dBm. Risetime The level of each of the two frequency components of the multi
21、frequency signal shall be be within 1 dB of the final value within 7 ms from the time that any button is operated. Signal timing When a button is depressed, the signal is output to line. It continues until the button is released. If the signal output is automatically timed, the duration of the signa
22、l shall be 70 In this case. the interdieital Dause shall have a minimum value of 65 ms. 5 ms excluding risetime. O Edition of May 15, 1986 CEPT T/CS*46-02*E m 2326414 0004828 7 TICS 46-02 E Page 5 2.4. 2.4.1. 2.4.2. 2.4.3. 2.4.4. 2.4.5. 2.4.6. Note I. Frequency tolerance The tolerance specified in C
23、CITT Recommendation Q.23 2 is 1.8%. However, it was considered that 1.5% could be achieved in practice without any difficulty for the operating conditions specified in Section 2.2. Note 2. Sending level The lower sending levcls are based on the application of CCITT Recommendation Q.15 5 to the use o
24、f push-button telephones for end-to-end data transmission. Assumptions were made for average power losses and activity factors. The pre-emphasis of 2 dB is a compromise between different national requirements. A tolerance of 1 dB was specified because it can be assumed that the drift in the power le
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
本资源只提供5页预览,全部文档请下载后查看!喜欢就下载吧,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- CEPTTCS4602E1986MULTIFREQUENCYSIGNALLINGSYSTEMTOBEUSEDFORPUSHBUTTONTELEPHONESETSIETR2061995 用于 按键 电话

链接地址:http://www.mydoc123.com/p-593057.html