CEPT T CS 34-18 E-1984 Cordless Telephone Technical Aspects《无绳电话技术方面》.pdf

1、, CEPT T/CS*34-L8*E 84 m 2326434 0004728 3 m Recommendation TIS 34-18 (Montpellier 1984) CORDLESS TELEPHONE TECHNICAL ASPECTS Recommendation proposed by Working Group T/WG I I “Switching and Signalling“ (CS) TCXI of rie Riorrsiail 8dB linc 3.5 km: 12 dB: - Side tonc .- Linc length O 3 4 km 0.4 mm R

2、= 270 ohmslkm. 45 nF/km O -+ 9 km 0.6 mm R = 120 ohms/km, 45 nF/km R loop Maximum of the line = 1,040 ohms Max. line attenuation = 11.5 dB; .- Loop current depending sending and receiving regulation is accepted. TIS 34-18 E Paga 13 Annex C REQUIREMENTS FOR THE TRANSMISSION PROPERTIES OF TELEPHONE SE

3、TS I. GENERAL The Netherlands Administration specifies the transmission properties of telcphone sets in un absolute way. related to refcrcnce cquivalcnts. This method is chosen because of thc limited accuracy of existing methods like OREM A. B. C und loudness riiting. In the case of cordless telepho

4、nes the frequency band is restrickd to 300-3,OOO Hz. The important properties are defined in the following sections. 2. SENDING SENSITIVITY The frequency response over a 600 ohm termination at the terminals shall fall within the frequcncy mask given in Figure A- (T/S 34-18). Test fixture: CCITT P.76

5、. Artificial Voice: CCITT P.51 4. Sound pressure: 104 dB relative to 20 pPa in the opening of the artificial voice. 3. RECEIVING SENSITIVITY With a signal source of 400 mV with a resistance of 600 ohms connected to the line terminals, the acoustic output shall fall within the frequency mask of Figur

6、e A-2 (T/S 34-18). Test fixture: CCITT P.76 3. Artificial Ear: IEC 318. 4. SIDETONE With a connection over the line terminals of 1,352 ohms in parallel with a series connection of 553 ohms and 83.5 nF, the acoustic output shall be below Curve I in Figure A-3 (T/SF 34-18), With a termination of 600 o

7、hms or with 1.5 km or 4.75 km artificial cable in between, the acoustic output shall be below Curve II in Figure A-3 Test fixture: CCITT P.76 (31. Artificial Ear: IEC 318. Artificial Voice: CCITT P.51 4. Sound pressure: 104 dB relative to 20 pPa in the opening of the artificial voice. (T/S 34-18). 0

8、 10 20 30 1009 2ooo 3400 5G0 10000 2oCKx) roo 200 500 HZ Od P 0,775 Y Figure A- I (TIS 34- 18). Sending sensitivity. CEPT T/CS*34-l8*E 84 m 232b414 0004741 b = Ti8 34-18 E Page i4 O d0 f 2OpPo Figure C-2 (T/S 34-1 8). Receiving sensitivity. 90 SPL 80 70 50 100 200 500 1000 2000 5000 10000 t.iyurc C-

9、3 (T, S 34- IS). Side tonc. Hr y- - CEPT T/CS*34-L8*E 84 232b4L4 0004742 8 _- _ - - TIS 34-18 E P-15 Annex D For Swiss P“T cordless telephones, the reference equivalent for transmission and mption is defined in the specifications as follows: SitisiriiJry $ spwdi Iratsrrri.vinrt (reference equivalent

10、), The rollowing valucs for the reference equivulcnt refer to objective measurements with the PIT calibrution Circuit and with the Brel and Kjacr (B 0-5.3 km 0.6 mm; 0-7.0 km 0.8 mm; C = 35 nF/km. I A- A! TIS 34-18 E Page li3 Annex E Ntitioital piiraitretcrs-U, K Rcfcrcncc cquivalcnts are not used u

11、s an uswssnicnl stiindard since they have inhcrcnt wcakncsseu. Ow thc CCIlT thcmsclvcs can carry out measurements whcrc Hccrcnscs Equivalents are used. British Telecom use the Internationally ugrcvtl CCT Loudness Ratings to Recommendation P.79 which is thc current standard and measureable by unyonc,

12、 I. Tablc 1, Send Loudness Rating Maximum 9.5 dB, 2. Tublc 2, Receive Loudness Riiiiiip Maximum O dB. Thc values include an allowancc for lociil cxcliiinge switching and mismatch losses. and are bascd on u 700 iypc telephone connected via a standard 6 kiii line. 3. Tablc 3. Subscriber Line Inforniii

13、tion Line length (kilomctcrs): Resistancc per kilomctcr: 168 ohms: Capacitance per kilomcicr: SO nF. wiindard line 6 km x 0.5 mm; 4. Paragraph 3.3. Annex A The loop current regulation of sending iin rwciving sensitivities. The maximum values as quoted in Tables I and 2 are obtained at a line current

14、 of 32 mA, On ii zcro line the current increases to 100 mA and minimum values of 2 dB Send Loudness Rating and -6,s tlB Rcveive Loudness Rating apply. On short lines overload and crosstalk iirc ilic tiiost important criteria and no allowance is made for switching and mismatch losses. 1 CEPT T/CS*34-

15、38*E 8LJ m 2326434 O004744 3 m _ TIS 34-18 E Pm 17 Anaex F National parametersfor th Socialist Federal Republic of Yugoslavia arc nSJollows: - The Sending Reference Equivalents relative to NOSFER: + 10.4 dB lo +3.5 dB in previous requirements, and - The Receiving Reference Equivalents relative to NO

16、SFER: + 1.7 dB to -3.5 dB in previous requirements, and - Information on the subscriber line: +7.5 dB to +3,5 dB in new requirements. -0.5 dB to -4.5 dB in new requirements. Maximum length: 2.6 km for 0.32 mm, 3.6 km for 0.4 mm. 5.6 km for 0.6 mm and 8 km for 0.8 mm in previous requirements, 2.6 km

17、for 0.32 mm. 3.6 km for 0.4 mm. 5.9 km for 0.6 mm and 8.2 km for 0.8 mm in new requirements. Resistance per kilometer: 434 ohmslkm for 0.32 mm. 280 ohmslkm for 0.4 mm. 122 ohms/km for 0.6 mm and 68 ohms/km for 0.8 mm, Capacitance per kilometer: 34 nF/km, 0.32 mm. 36 nF/km. 0.4 mm. 38 nF/km, 0.6 mm a

18、nd 38 nF/km, 0.8 mm. Telephone set loop current: 20 mA to 60 mA. .- I CEPT T/CS*34-L8*E 84 232b4L4 0004745 3 _ _ TJS 34-18 E Page 18 Annex G Bclgkin A(ltiitii.trufiti Telephonometrk characteristics Rcfcrcticc cqidwiliw The sending rcfercncc equivalent (SRE) of the transmitting telephone system and t

19、he receiving reference equivalent (RRE) of the recciving telephone system are measured according to the objective method OREM A with the electro-acoustic calibration equipment “Brel & Kjacr“, type 3354. thc rollowing conditions being fulfilled: METER FUNCTlOh y = kX“. COMPENSATION OUT METER DUMPING

20、SLOW WEIGHTING SFERT TEST HEAD type 4905 REF position TEST EAR NBS $A COUPLER . TEST MOUTH 4219 The measures arc carried out with a feeding bridge of 48 V. 2 x 200 ohms, and without artificial line. The values of SRE and RRE equivalents, expressed in OREM A, are respectively included within the following limits: (a) for all regulated telephone sets -2 Q ERE 4 dB -6 ERR QO dB (b) for some non-regulated telephone sets belonging to the “purchasing system“ (behind PABXs) - 6ERE OdB -IO ERR -4 dB