SMPTE 304M
SMPTE STANDARD for Television ----
Broadcast Cameras ---Hybrid Electrical and Fiber-Optic Connector Page 1 of 12 pages
1 Scope This standard defines a connector primarily intended for use in television broadcasting and video equipment, such as camera head to camera control-unit connections. It defines hybrid connectors, which contain a combination of electrical contacts and fiberoptic contacts for single-mode fibers. It also contains dimensional tolerances which ensure nondestructive mating of the electrical and optical interfaces, and functional operability of the electrical interface. Functional operability of the optical interface is dependent upon fiber preparation and termination and is, therefore, not guaranteed by this standard.
Each connector shall contain two fiber-optic contacts, with cylindrical spherical butting ferrules. The ferrules shall be ceramic and the optical alignment mechanism shall be a split sleeve contained in the contacts on the plug. Appropriate dust caps for all connector configurations shall be used as protection against contamination during unmated situations. 3.2 Contact requirements The connectors shall house two fiber-optic contacts, two auxiliary electrical contacts, and two low-voltage contacts.
2 Normative reference The following document contains provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standard listed below. IEC 60874-1 (1993-02), Connectors for Optical Fibres and Cables ---- Part 1: Generic Specification
3 Connector specifications
3.3 Classifications Connectors covered by this part shall be classified as: -- Name: Hybrid connectors -- Coupling: Push pull -- Configurations: Cable plug (to mate with connector on camera) color coded for identification; cable jack (to mate with base station); jack, receptacle (installed on camera); plug, receptacle (installed on base station). 3.4 Field serviceability
3.1 Structural requirements The connector system shall consist of a plug-and-jack arrangement. It shall feature a push-pull quick connect/disconnect coupling mechanism. The plug shall be identified by a color-code marking.
The connectors shall be designed to permit field termination, replacement, and repair by trained personnel, using assembly instructions supplied by the connector manufacturer, and with the appropriate tooling.
CAUTION NOTICE: This Standard may be revised or withdrawn at any time. The procedures of the Standard Developer require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of publication. Purchasers of standards may receive current information on all standards by calling or writing the Standard Developer. Printed in USA. Copyright © 1998 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100
SMPTE 304M
4 Mechanical interface dimensions 4.1 Mating interface dimensions The mating interface dimensions for each connector configuration (plug and jack) shall be in accordance with figures 1 and 2 and tables 1 and 2. All dimensions are metric.
-- Temperature: --20 ° C to +60 ° C operating
The connectors shall have polarization keys in accordance with figures 3 and 4 and tables 3 and 4. 4.3 Contact arrangements The contracts shall be located in accordance with figures 5, 6, and 7 and tables 5 and 6.
-- Humidity:
--40 ° C to +85 ° C nonoperating /storage Less than 95% RH (at +40 ° C)
NOTE -- The degree of waterproofing is left for manufacturing implementation. Waterproofing shall not interfere with the interface as specified.
6 Safety
5 Performance The connectors shall meet the following minimum requirements:
Page 2 of 12 pages
Low-voltage contacts: 42 V ac or 60 V dc -- Voltage: 1A -- Current: -- Environmental:
4.2 Keying
-- Optical: -- Wavelength: -- Insertion loss: -- Return loss:
-- Electrical: Auxiliary electrical contacts: 600 V ac -- Voltage: 10 A -- Current:
1100 nm -- 1350 nm 0.5 dB maximum Better than --45 dB
The design of the connectors shall allow use throughout North America under the requirements of Underwriters Laboratories (UL), the Canadian Standards Association (CSA), or other similar authorities, appropriate to the intended application.
SMPTE 304M
Figure 1 -- Plug mating interface
Page 3 of 12 pages
SMPTE 304M
Table 1 -- Plug mating dimensions Specifications (mm) Dimensions
Minimum
Nominal
Maximum
A
/
/
φ 2.000
1)
Description Split sleeve inside diameter
B
/
/
11.25
Connector shell to reference plane
C
/
/
10.17
Split sleeve to reference plane
D
/
/
9.4
F
/
/
7.15
G
/
3.33
/
H
/
/
8.9
Low-voltage contact location
J
φ 1.999
/
φ2
Diameter of optical ferrule
K
φ 0.88
/
φ 0.885
Insert dimension Insert dimension Optical to mechanical reference plane
1)
Low-voltage contact inside diameter
L
1.3
/
/
M
Split sleeve
φ 1.27
/
f 1.3
N
φ 3.05
/
/
P
/
/
4.3
Auxiliary electrical contact location
Q
/
/
φ3
Split sleeve outside diameter
R
φ 4.48
/
/
Insert dimension
T
φ 12.97
/
/
Shell inside diameter
U
/
/
φ 18
Shell outside diameter
V
/
/
φ 19.6
Latch outside diameter
X
/
/
1.2
Latch dimension
Y
/
30 °
/
Latch dimension
Z
/
/
2.4
Auxiliary electrical contact outside diameter Insert inside diameter for auxiliary electrical contact
Low-voltage contact depth
Nominal location of spring-loaded optical ferrule when subject to a load force of 3 N to 8 N. Spring loading optional on plug optical contacts.
Page 4 of 12 pages
SMPTE 304M
Figure 2 -- Jack mating interface
Page 5 of 12 pages
SMPTE 304M
Table 2 -- Jack mating dimensions Specifications (mm) Dimensions
Minimum
Nominal
Maximum
A
2.05
/
/
1)
Description Latch groove dimension
B
/
/
8.55
Groove location
C
7.35
/
/
Insert dimension
D
7.73
/
/
Insert dimension
E
7.7
/
/
Auxiliary electrical contact depth
F
10.27
/
/
Insert dimension
G
11.35
/
/
Shell depth
H
/
3.33
/
Optical to mechanical reference plane
J
2.97
/
/
Low-voltage contact location
K
/
/
0.05
M
φ 1.999
/
φ2
N
φ 3.2
/
/
P
/
/
φ 2.95
Q
Auxiliary electrical contact location Diameter of optical ferrule Insert inside diameter Insert dimension
φ 0.87
/
φ 0.9
R
10.33
/
/
Insert location
S
φ 11.05
/
/
Insert outside diameter
T
/
/
f 12.95
U
φ 18.1
/
/
Shell inside diameter Latch groove diameter
Low-voltage contact outside diameter
Shell dimension
V
φ 19.7
/
/
W
φ 1.28
/
φ 1.285
X
/
30 °
/
Latch dimension
Y
/
/
1.07
Insert dimension
Auxiliary electrical contact inside diameter
Nominal location of spring-loaded optical ferrule when subject to a load force of 3 N to 8 N.
Page 6 of 12 pages
1)
SMPTE 304M
Section A-A Figure 3 -- Plug key arrangement
Table 3 -- Plug key dimensions Specifications (mm) Dimensions
Minimum
Nominal
Maximum
BG
/
/
2.43
BH
/
95 °
/
BJ
/
115 °
/
BN
/
/
φ 19
BP
/
/
3.5
BQ
/
145 °
/
BR
/
/
1.83
Page 7 of 12 pages
SMPTE 304M
Section A-A Figure 4 -- Jack key arrangement
Table 4 -- Jack key dimensions Specifications (mm)
Page 8 of 12 pages
Dimensions
Minimum
Nominal
Maximum
BG
2.02
/
/
BH
/
95 °
/
BJ
/
115 °
/
BK
18.55
/
/
BL
5.35
/
/
BM
/
145 °
/
BN
2.52
/
/
SMPTE 304M
NOTE -- Figure viewed from front face Figure 5 -- Plug contact arrangement
Table 5 -- Plug contact dimensions Specifications (mm) Dimensions
Minimum
Nominal
Maximum
Description
BA
φ 6.895
/
φ 6.905
Auxiliary electrical contact
BB
6 ° 25 ′
/
6 ° 35 ′
BC
34 ° 56 ′
/
35É4 ′
BE
φ 5.295
/
φ 5.305
Fiber-optic contact
BF
φ 8.395
/
φ 8.405
Low-voltage contact
Page 9 of 12 pages
SMPTE 304M
NOTE -- Figure viewed from front face Figure 6 -- Jack contact arrangement
Table 6 -- Jack contact dimensions Specifications (mm) Dimensions
Minimum
Nominal
Maximum
Description
BA
φ 6.895
/
φ 6.905
Auxiliary electrical contact
BB
6 ° 25 ′
/
6 ° 35 ′
BC
34 ° 56 ′
/
35É4 ′
BE
φ 5.295
/
φ 5.305
Fiber-optic contact
BF
φ 8.395
/
φ 8.405
Low-voltage contact
Page 10 of 12 pages
SMPTE 304M
NOTE -- Figure viewed from front face
Figure 7 -- Pinout wiring diagrams
Annex A (informative) Quality A.1 Quality assessment procedure The quality assessment procedure specified herein and in clause 3 of IEC 60874-1 should apply.
Annex B (informative) Compliance B.1 Fixed sample procedure
B.2 Testing
When specified, the fixed sample procedure should be in accordance with 3.3.1 of IEC 60874-1.
The complete series of tests specified in the annex is the minimum level covered by this specification. The tests of each group should be carried out in the order given and satisfy the performance given in the requirement therein.
Annex C (informative) Cable The connector described in this standard is intended for use primarily with the hybrid fiber optic camera cable described
in SMPTE 311M; however, this connector may be used independently to meet other requirements.
Page 11 of 12 pages
SMPTE 304M
Annex D (informative) Bibliography SMPTE 311M, Television ---- Hybrid Electrical and Fiber-Optic Camera Cable
ANSI/EIA/TIA 455-107-1989, Return Loss for Fiber Optic Components
ANSI/EIA 492BA00-1988, Blank Detail Specification for Class IVa Dispersion, Unshifted Single-Mode Optical Waveguide Fibers
ANSI/UL 498-1993, Attachment Plugs and Receptacles
ANSI/EIA/TIA 455-A-1991, S t a n d a r d T e s t P r o c e d u r e s for Fiber-Optic Fibers, Cables, Transducers, Sensors, Connecting and Terminating Devices, and Other Fiber Optic Components
Page 12 of 12 pages
IEC 60793-1-1 (1992-10), Optical Fibres ---- Part 1: Generic Specification ---- Section 1: General IEC 601076-1 (1995-07), Connectors with Assessed Quality for Use in D.C. Low Frequency Analogue and in Digital High Speed Data Applications ---- Part 1: Generic Specification
