1、 TIA-604-2-B (Revision of TIA-604-2-A) August 2004FOCIS 2 Fiber Optic Connector Intermateability Standard- Type ST TIA-604-2-B-2004 APPROVED: AUGUST 31, 2004 REAFFIRMED: JANUARY 29, 2014 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating m
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19、NT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA-604-2-B FOCIS 2B FIBER OPTIC CONNECTOR INTERMATEABILITY STANDARD TYPE ST TABLE OF CONTENTS 1 INTRODUCTION 1 2 ADAPTER STANDARD 3 3 PLUG STANDARD 5 4 APPLICATIONS 7 TIA-604-2-BiiTIA-60
20、4-2-B 1 FOCIS 2B FIBER OPTIC CONNECTOR INTERMATEABILITY STANDARD (From TIA Standards Proposal Nos 3228-C and 3228-C-1 formulated under the cognizance of TIA FO-6.3, Subcommittee on Fiber Optic Interconnecting Devices.) This document is part of the series of test standards included within TIA/EIA-604
21、, Fiber Optic Intermateability Standards (FOCIS). 1 Introduction 1.1 Scope FOCIS 2B presents the intermateability standard for connectors with the commercial designation ST, and includes requirements for PM fiber connectors. This standard is issued as an addendum to TIA/EIA 604, Fiber Optic Connecto
22、r Intermateability Standards. The provisions of TIA/EIA 604 apply to this document. 1.2 Objective Intermateability standards define the minimum physical attributes of mating connector components. Fully dimensioned components are not within the scope or intent of FOCIS 2B. The requirements in FOCIS 2
23、B have been selected with the objective of ensuring that any combination of plugs and adapters conforming to the requirements of FOCIS 2B will mechanically intermate, and that intermated connector assemblies will meet a common level of performance. The common level of performance of an intermated co
24、nnector assembly is the least demanding set of performance requirements in the separate performance specifications of each of the products in the assembly; see TIA/EIA 604. 1.3 Limitations Realization of the objectives for FOCIS 2B may be limited by the following considerations: 1.3.1 Configuration
25、Options There are configuration options for both plugs and adapters in FOCIS 2B that impose limitations on the combinations of plugs and adapters that should be combined in a connector assembly. For the plugs to be inserted in the adapter the keying option, k, for both plugs must be compatible with
26、the keying option of the adapter. Both plugs should have the same ferrule diameter option, t. An assembly with different diameter options may have a higher loss than anticipated. Both plugs should have the same angle of contact option, a. An increase in loss may be expected if plugs with different c
27、ontact options are mated, and the polish on the ferrules may be damaged. TIA-604-2-B 21.3.2 Common Performance The following considerations limit the application of common performance: The location of the optical cores, figure 3.2.1 is defined, without tolerances, by its true position. To apply comm
28、on performance the distributions of the actual position of this feature should be centered on its respective true position. Tuning of the connector plugs may improve performance when plugs are mated with plugs that have been similarly tuned. Tuning, however, offsets the cores relative to the center
29、of the ferrule and common performance can not be expected between tuned plugs and untuned plugs. Tuned plugs are assembled so that the offset of the fiber falls in a preferred location with respect to the key, see clause 3.2.7. As an alternative to tuning for fiber offset, plugs could be tuned for a
30、pex offset. This standard does not control the intrinsic loss that may occur between fibers in a connector assembly. Intrinsic loss between fibers must be added to the basic connector loss 1.3.3 Resolution Cases of combinations of plugs and adapters where mechanical intermateability or the common le
31、vel of performance is not achieved should be resolved through the cooperation of the user and the connector and adapter manufacturer(s). 1.4 Drawing practices To be in compliance with ANSI and ISO Engineering Drawing Practices, the following shall apply: 1. Where a tolerance of form is not specified
32、, the limits of the dimensions for a feature control the form as well as the size. The combined effects of size and form variations may not exceed the envelope of perfect form at the maximum material condition (MMC). 2. Where interrelated features of size (features shown with a common axis or center
33、 plane) have no geometric tolerance of location or runout specified, the limits of the dimensions for a feature control the location tolerance as well as the size. When interrelated features are at the MMC they shall be perfectly located to each other as indicated by the drawing. 3. Where perpendicu
34、lar features (features shown at right angles) have no geometric tolerance or orientation or runout specified, the limits of the dimensions for a feature control the orientation tolerance as well as the size. When perpendicular features are at the MMC they shall be perfectly oriented to each other as
35、 indicated by the drawing. 4. As the size of a feature departs from the MMC, variations in form, location and orientation are permissible. TIA-604-2-B 3 2 Adapter standard 2.1 Adapter designation The designation for a FOCIS 2B adapter is: FOCIS 2B A-n-k-m where A designates that it is the adapter n
36、is the number of fibers k defines the keying configuration m defines the mounting configuration 2.2 Adapter requirements FOCIS 2B adapters shall meet the requirements of this section. 2.2.1 Adapter interface dimensions The dimensional requirements for FOCIS 2B adapters are defined as follows: n=1 -
37、figure 2.2.1a, Simplex adapter interface n=2 - figure 2.2.1b, Duplex adapter interface 2.2.2 Adapter sleeve The adapter sleeve may be either solid or split (resilient), and the sleeve may be either fixed or floating within the adapter. The minimum inside diameter of the sleeve is specified by the fo
38、rce required to remove a gage pin from the sleeve. The force required to remove a gage pin from the sleeve in a FOCIS 2B adapter shall not exceed 5.89 newtons (600 gf.) The procedures of FOTP 158 shall be used to measure the withdrawal force. Gage pin diameters are specified in table 1. Table 1 - Ga
39、ge pin diameters Sleeve Type Minimum Diameter mm Maximum Diameter mm Split, Resilient 2.4985 2.4995 Solid 2.5000 2.5005 The maximum inside diameter of the sleeve is in effect limited by the common level of performance that the adapter is to achieve. TIA-604-2-B 42.2.3 Adapter mounting options The ad
40、apter mounting options are defined in table 2. Table 2 - Adapter options Adapter Mounting Option Type of mounting m=0 Unspecified Mounting m=1 Simplex flange mounting with screws m=2 Simplex mounting with panel nut m=3 Duplex mounting with panel nuts m=4 Duplex flange mounting with screws Adapters w
41、hose mounting features are not defined are identified with the option m=0. The dimensions of the surfaces of the adapter that interface with the mounting panel are defined by the holes and cutouts in the panel on which the adapter is mounted. FOCIS 2B adapters shall be capable of being mounted on pa
42、nels with the dimensions in figure 2.2.3. 2.2.4 Adapter keying options Keying refers to differences in the interface between FOCIS 2B plugs and adapters that affect the ability of plugs and adapters to be connected or that alter the performance of the resulting connector assembly. Only a single keyi
43、ng interface has been defined, k=1. The dimensions for k=1 are defined in figure 2.2.1a. TIA-604-2-B 5 3 Plug standard 3.1 Plug designation The complete designation for a FOCIS 2B connector plug is: FOCIS 2B P-d-n-k-t-a where P designates that it is the plug d defines the plug design n is the number
44、 of fibers k defines the keying arrangement t defines the ferrule diameter a is the angle of contact 3.2 Plug requirements FOCIS 2B plugs shall meet the requirements of this section. 3.2.1 Plug interface option There is one plug interface options for FOCIS 2B plugs. The requirements for this interfa
45、ce are: d=1 figure 3.2.1; the d=1 plug is a quarter turn bayonet plug. 3.2.2 Ferrule extension and contact force The travel of the ferrule relative to the body of the plug and the spring force on the ferrule are defined in Figure 3.2.2. 3.2.3 Ferrule diameter option Ferrule diameters for FOCIS 2B pl
46、ugs are specified in table 3. Table 3 Ferrule diameter (mm) t Min. Max. Fiber 1 2.4985 2.4995 SM 2 2.498 2.500 MM 3 2.497 2.500 MM 4 2.494 2.500 MM The ferrule tolerance t=1 is generally applied to plugs with single-mode fiber. The ferrule tolerances t=2 to t=4 are generally applied to plugs with mu
47、ltimode fiber. 3.2.4 Angle of contact option The contact angle is the angle between the plane of contact between mating fibers, and a plane perpendicular to the optical axis of the connector. a=0, designates an angle of 0 TIA-604-2-B 6Standards for an angle of contact other than 0 have not been deve
48、loped for FOCIS 2B connectors. 3.2.5 Plug keying option The only keying option defined for FOCIS 2B plugs is k=1. 3.2.6 Ferrule geometry The geometry of the end of the ferrule is defined in Figure 3.2.6. 3.2.7 Plug tuning It is not required that plugs be tuned if, however, a plug is tuned, the orien
49、tation of the eccentricity of the core is to be located as shown in figure 3.2.7. Tuning of the plug is the preferential angular positioning of the ferrule relative to the key of the plug. TIA-604-2-B 7 4 Applications The FOCIS 2B adapter requirements may be extended to hybrid adapters and receptacles. 4.1 Hybrid adapters A hybrid adapter provides an optical connection between plugs of two different types. A hybrid adapter between a FOCIS 2B connector and another connector would have the dimensions of figure 2.2.1a on one side of the centerline or optical plane and the corr
