1、SMPTE STANDARD for Television - Four-Circuit Fiber Optic Connector a 1 Scope This standard describes an interface for a general purpose fiber optic connector for interconnection of television equipment. For information on testing for physically demanding applications, the reader is di- rected to the
2、 informative references listed in annex B. The connectors may find use in a variety of other signal transmission applications. The design accom- modates both single mode and multimode optical fibers. The standard defines connectors that are hermaphro- ditic by construction, allowing cable plugs to m
3、ate with like cable plugsas well as bulkhead receptacles, while maintaining polarization. 0 Separate physical packaging design objectives will result in the availability of both cable and bulkhead connectors for installation in harsh environments. Connector and optical termini adhering to the limits
4、 of the interfacial dimensions of this standard will inter- mate. Applicable tolerances to the basic dimensions shall be such that the combined value of these toler- ances shall not exceed the limit described in note 5. 2 Normative reference The following standard contains provisions which, through
5、reference in this text, constitute provisions of this standard. At the time of publication, the edition indicated wasvalid. All standards aresubject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the
6、standard indicated below. Page 1 of 6 pages ANSVTIA/ElA-455-8-98, Standard Test Procedure for Fiber Optic Fibers, Cables, Transducers, Sensors, Connecting and Terminating Devices, and Other Fiber Optic Components 3 Connector specifications 3.1 Construction The connector for terminating a four-fiber
7、cable shall be a hermaphroditic cable plug. The jam-nut mount receptacle shall accept four individual singlechannel cables. The hermaphroditic cable plug shall feature a threaded coupling ring which when backed off shall expose a male threaded end which in turn shall be capable of mating to a like c
8、able plug with the coupling ring in the forward position. The connector cable plug shall strain-relieve a single- jacket multifiber cable. Each connector shall accom- modate a total of four contacts -two pins and two sockets. Single mode connectors shall have a durable yellow marking, visible before
9、 and aiter mating, to give an indication of the fiber type inside the connector. Multi- mode connectors shall not require any special marking. 3.2 Contacts The optical contacts shall meet the requirements of this standard (see figures 4 and 5) when retained inside connectors as described herein. The
10、 optical contacts shall have cylindrical abutting ceramic ferrules. For single mode applications, optical ferrules shall be physical contact (PC) polished or for CopyrigM2001 bylHE SOCIETY OF MOTION PICTURE AND TELRIISION ENGINEERS 595 W. Harsdale Ave., White Plains, NY 1 OW7 (914) 761-1100 Approved
11、 April 19,2001 SMPTE 8581-2001 enhanced performance, super PC polished. For multi- mode applications, optical ferrules may have flat sur- faces. The optical alignment mechanism should be a split sleeve, which shall be retained by the socket contacts. The contacts shall provide stated optical perform
12、ance when terminated with standard single mode and mukirnode 125-micron diameter clad fibers. SM: 0.70 dB max, PC polished SM enhanced: 0.50 dB max, super PC polished 5.2 Return loss: SM: 2 35 dB, PC polished SM enhanced: 2 50 dB , super PC polished 4 Mechanical interface dimensions 5.3 Temperature
13、range: 4.1 Mating interface dimensions - 55 to + 85“ C The mating interface dimensions for each connector configuration (plug and receptacle) shall be in accord- ance with figures 1,2, and 3. 4.2 Contact locations The contacts shall be located in the plug cavities as follows (see figure 3): Sockets
14、- Cavities 1 and 2 Pins - Cavities 3 and 4 5 Performance The connectors shall meet the performance require- ments of the entire standard throughout the tempera- ture range. 5.1 Insertion loss: MM: 0.75dBmax NOTES 1 Figures 1 through 5 specify interface dimensions and intermateability requirements. 2
15、 All dimensions are in millimeters except for mating thread call-outs which are in English. 3 Dimensions from the reference plane to the end of the guide bushing shall be measured with contact in the con- nector (see figures 1,2,4, and 5). 4 The pin terminus spring shall apply a 31 N to 13 N load wh
16、en fully mated. 5 Mating cavities shall be aligned to their basic positions (see figure 3) within a 0.25 circle, regardless of feature size. 6 The design of the sleeve shall be such that it provides alignment of 2.0005 - 1.9995 diameter ferrules. Page 2 of 6 pages a SMPTE 3581-2001 INTERFACE 7 -1 13
17、 13 MAX FORWARD FSWN OF COUPLING NT 0 INTERFACIAL SEALS 0 1.78 NOM. 1-oo-16 “WA CROSS SECTION 6.06 MAIOR DIA TRUNCATED TO 24.87mn NOMINAL 4 9-4 I- 8.89mn MIN. FULL THD. NOTE - In order to achieve channel integrity with hermaphroditic connectors, proper channel-tochannel wiring shall be observed. Fig
18、ure 1 - Plug interface section A-A INTERFACE 13 MIN 1.00.16 UN-2A THD MAIOR MA TRUNCATED TO 24.87mm NOMINAL 8.89mm MIN. FULLTHD. Figure 2 - Receptacle interface section A-A Page 3 or 6 pages SMPTE 358M-2001 IDEKnFiCATiO (4 PLACES) 0 3.15 MIN. Figure 3 - Face view (see figures 1 and 2 for view A-A) p
19、l SEE FIGURES 1 & 2 GUIDE BUCHIN 01.9995 / 20005 r ALIGNMENT SLEEVE SEE NOTE 6 II Figure 4 - Socket contact Page 4 of 6 pages SMPTE 358M-2001 I RP I SEEFIGURES 1 &2 I GUIDE BUSHING Figure 5 - Pin terminus Annex A (informative) Channel integrity In order to achieve channel integrity with hermaphrodit
20、ic connectors, proper channel-to-channel wiring should be obsewed (see figure A.1). CABLE ASSEMBLY “Information reference“ CONNECTION DIAGRAM 1SKT - 4PiN 2SKT - 3PIN 3PIN - 2SKT 4PIN - 1SKT Figure A.l - Channel-to-channel wiring Page 5 of 6 pages SMPTE 3581-2001 Annex B (informative) Bibliography AN
21、SIIEIA-364-268-99, TP-26B - Salt Spray Test Proce- dure for Electrical Connectors, Contacts and Sockets ANSIITIAIEIA-455-5B-94, FOTP-5 - Humidity Test Pro- cedure for Fiber Optic Components ANSVEIA-455-21 A-88, FOTP-21 - Mating Durability for Fi- ber Optic Interconnecting Devices ANSllTIAIEIA-455-13
22、A-96, FOTP-13 - Visual and Mechanical Inspection of Fiber Optic Components, Devices, ANSIIEIA-455-26A-85 (R96), FOTP-26 - Crush Resistance of Fiber Optic Interconnecting Devices ANSl/ElA/TIA-455-68-92, FOTP-6 - Cable Retention Test Procedure for Fiber Optic Cable Interconnecting Devices ANsI/EIA/TIA
23、-455-12A-89, FOTP-12 - Fluid Immersion Test for Fiber Optic Components and Assembies ANSIirIAEIA-455-34A-95 (R96), FOTP-34 - Interconnec- tion Device Insertion Loss Test ANSlirlAIEIA-455-56B-95 (R99), FOTP-56 - Test Method for Evaluating Fungus Resistance of Optical Fiber and Cable ANSI/ilA/EIA-455-
24、2C-g8, FOTP-2 - Impact Test Measure- ANSlirIA/EIA455-107A-99, FOTP-107 - Detemination Of ments for Fiber Optic Devices Component Reflectance or LinWSystem Return Loss Using a Loss Test Set ANSI/TIA/EIA-455-3A-89, FOTP-3 - Procedure to Measure Temperature Cycling Effects on Optical Fibers, Optical Cable, and Other Passive Fiber Optic Components TIA/EIA-455-36A-86, FOTP-36 - Twist Test for Fiber Optic Connecting Devices Page 6 of 6 pages
