1、 TfCS34-09E Page 1 - Recommendation T/CS 34-09 (Cannes 1983) MEPB-RECEIVER AT THE SUBSCRIJIERS PREMISES Recommendation proposed by Working Group T/WG 11 “Switching and Signalling” (CS) Text of the Recommeixntion ndopted by the “Telecommuriicntiois” Commission: “The European Conference of Postal and
2、Telecommunications Administrations, considering - that introduction of MFPB-telephone sets in the telephone network allows simple one-way signal transmission - that the MFPB Signalling system offers the possibility of transmitting l-character combinations; - that various special terminals (e.g. tele
3、phone for handicapped people) use MFPB signals via the switched at speeds up to about 8 characters per second; telephone network, recommends, that the members of the CEPT recognise that MFPB-receivers at the subscriber premises meet the requirements specified below.” Edition of May 15, 1986 1. 1.1.
4、1.2. 2. 3. 3.1. 3.2. 3.3. 3.3.1. 3.3.2. TICS 34-09 E Page 3 AREA OF APPLICATION This recommendation deals with the receiver or receiver fiinction placed at a subscribers premises for terminal to terminal transmission using MFPB. The receiver shall respond to signals received over a line from a dista
5、nt sender in conformity to Recom- mendations T/CS 46-02 i and T/CS 34-08 2. The receiver may be utilized with only 10 discrete signals, in which case the signals designated k, #, 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. OP
6、ERATING CONDITIONS The requirements specified in Recommendation T/TR 02-06 3 shall be met. OPERATE AND NON-OPERATE REQUIREMENTS Signal condition The signal condition is defined as the state of the line at the input of the receiver when the electrical signals on it correspond to a genuine signal (as
7、specified in Recommendation T/CS 46-02 l, section 1.2.) accompanied by an acceptable amount of other unwanted frequencies. The exact definition of the com- ponents concerned is given in paragraph 3.3.1. Character recognition condition The character recogiiitiori condition is defined as the functiona
8、l state which the receiver is in, when the signal condition and time requirements (as specified in paragraph 3.4.1.) are satisfied. This functional state causes the correct one of the 16 possible signal codes (as specified in Recommendation T/CS 46-02 i, section 1.2.) to be output. When required the
9、 receiver will also output information on the beginning and end of the caracter recognition condition. Signal condition requirements The signal condition as dened in paragraph 3.1. and in accordance with the system utilisation as described in paragraph 3.2., exists if, on the line at the functional
10、input of the receiver: (a) two of the signalling frequencies are present, one of each of the low and high frequency groups as specified in Recommendation T/CS 46-02 i, section 1.2.; (b) each of these signalling frequencies is within f (1,5% + 5 Hz) of the nominal value; (c) the level of each of thes
11、e two signalling frequencies is within the range of -45 dBm to -4 dBm; (d) the difference in level of these two signalling frequencies is less than 8 dB; (e) these 2 frequencies are accompanied by other frequencies not exceeding: i) in the range 15-480 Hz, an individual level of f20 dB at 15 Hz unti
12、l 33 Hz then falling at 20 dB per octave until 300 Hz. From 300-480 Hz at a level of -60 dBm. Also when dialtone protection is present in the receiver a total level of -5 dBin in the range 300-480 Hz shail additionally apply to cover interference from this source, ii) in the range 480-3,400 Hz, a to
13、tal level of 20 dB below the level of the “low” group signalling frequency, or - 61 dBm whichever is the higher, iii) in the range over 3,400 Hz, an individual level of - 36 dBm at 3,400 Hz rising at 6 dB per octave to a level of + 10 dBm. The signal condition as dened in paragraph 3.1. does not exi
14、st if, on the line of the functional input of the receiver: - the level of one of the 2 signalling frequencies is less than -54 dBm. This non-existence of the signal condition is also known as the pause condition. Edition of May 15, 1986 CEPT T/CS*34-09*E 3 = 232b414 0004b3 7 M TICS 34-09 E Page 4 3
15、.4. Character recognition requirements 3.4.1. The character recognition condition as defined in paragraph 3.2. shall exist if: (a) the corresponding signal condition is preceded by the continuous non-existence of a signal condition for more than 40 ms, or (optionally) by a different character recogn
16、ition condition, and (b) the signal condition then exists continuously for more than 40 ms. However, when this signal condition exists for less than 20 ms, this character recognition condition shall not exist. Once the character recognition condition exists, it shall be unaffected by an interval of
17、less than 20 ms between two signal conditions corresponding to the same signal code (as specified in Recommendation TICS 46-02 i, section 1.2.) the interval consists either: (a) of any break in the signal condition, or (b) of a signal condition corresponding to a different signal code. 3.4.2. 4. 5.
18、I11 121 31 41 SPEECH IMMUNITY PERFORMANCE For further study. ELECTRICAL CHARACTERISTICS The receiver should satisfy the relevant parts of Recommendation TICS 30-02 4 on private attachments. References Recommendation TICS 46-02. Multifrequency signalling system to be used for push-button telephones.
19、Recommendation TICS 34-08 I Automatic sender for push-button miiltiJi.equet1cy signalling. Recommendation T/TR 02-06. Environmental Conditions for Telecommimication Equipment, Conditions for Telecommunication Equipment at Weather-Protected Locations (excluding Telecomiitunication Centres with Temperature and Humidity Controls) and in the Open Air. Recommendation TICS 30-02. Technical requireinents for privately owned equipment at subscriber premises connected to the public switched telephone network. Edition of May 15, 1986
