Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2001-07-02
2003-11-04
Martin, David (Department: 2841)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S796000, C361S800000, C361S788000, C361S752000, C174S255000
Reexamination Certificate
active
06643141
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a transmission apparatus, a subrack, and a connector unit, and more particularly to a transmission apparatus, a subrack, and a connector unit each having a shield structure for enhancing EMC (Electro Magnetic Compatibility) performance thereof.
2. Description of the Related Art
Recent transmission apparatuses can be equipped with ATM (Asynchronous Transfer Mode)/LAN (Local Area Network) functions in addition to the existing SONET (Synchronous Optical Network)/SDH (Synchronous Digital Hierarchy) systems. In this case, a plurality of transmission lines are cross-connected via the transmission apparatus.
FIG. 34
shows the appearance of a conventional transmission apparatus. The conventional transmission apparatus
900
has a shield rack
910
housing a subrack
920
. The shield rack
910
has a door
911
attached to the front face thereof for opening and closing the shield rack
910
. Further, the shield rack
910
has an upper wall thereof formed with openings
912
,
913
for receiving cables therethrough.
The subrack
920
also has a door
922
attached to the front face thereof for opening and closing the subrack
920
. The subrack
920
houses a plurality of electronic circuit units
921
to which are connected various cables inserted through the openings
912
,
913
from the outside of the shield rack
910
. The cables connected to the plurality of electronic circuit units
921
include metallic cables
931
,
932
and optical fiber cables
933
,
934
.
In the transmission apparatus
900
constructed as above, the shield rack
910
shields the plurality of internal electronic circuit units
921
and the various cables received therein from external electromagnetic waves, for improvement of EMC performance of the electronic circuit units
921
and the cables.
In recent years, with improvement of processing capabilities, the number of cables to be connected to electronic circuit units in a transmission apparatus tend to be increased. Therefore, the conventional transmission apparatus
900
is required to have the openings
912
,
913
increased in open area so as to receive an increased number of cables.
However, if the openings
912
,
913
are increased in open area, it can cause degradation of the EMC. In addition, recently, electronic circuit units tends to have higher operating frequencies, and hence there are more exacting demands for EMC performance of such units.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a transmission apparatus, a subrack, and a connector unit which are capable of maintaining excellent EMC performance even if an increased number of cables are connected thereto.
To attain the above object, according to a first aspect of the invention, there is provided a transmission apparatus including a plurality of communication interfaces. The transmission apparatus comprises a subrack including a back wiring board, a first connector arranged on a front surface of the back wiring board, and a second connector arranged on a rear surface of the back wiring board and electrically connected to the first connector, an electronic circuit unit connected to the first connector on the back wiring board, and a connector unit including a connector board on which are mounted a male seat connector connected to the second connector on the back wiring board and an external line connector electrically connected to the male seat connector, and a metal case for covering the connector board.
To attain the above object, according to a second aspect of the invention, there is provided a subrack that is capable of housing a plurality of communication interfaces. The subrack comprises a back wiring board, an electronic circuit unit-receiving block arranged on a front surface of the back wiring board, for receiving an electronic circuit unit, a first connector provided in the electronic circuit unit-receiving block, for connection with the electronic circuit unit, a connector unit-receiving block arranged on a rear surface of the back wiring board, for receiving a connector unit including a connector board on which are mounted a male seat connector and an external line connector electrically connected to the male seat connector, and a metal case for covering the connector board, and a second connector provided in the connector unit-receiving block, for electrical connection with the first connector and connectable with the male seat connector of the connector board.
To attain the above object, according to a third aspect of the invention, there is provided a connector unit for electrically connecting between an electronic circuit unit having a communication interface function and an external cable. The connector unit comprises a connector board on which are mounted a male seat connector connectable to a connector provided in a subrack which is capable of housing the electronic circuit board, and an external line connector electrically connected to the male seat connector, and a metal case for covering the connector board.
The above and other objects, features and advantages of the present invention will become apparent from the following description when taken in conjunction with the accompanying drawings which illustrate preferred embodiments of the present invention by way of example.
REFERENCES:
patent: 5023754 (1991-06-01), Aug
patent: 6241530 (2001-06-01), Eddy
patent: 6323423 (2001-11-01), Tirrell
patent: WO 00/74454 (2000-12-01), None
Inoue Takashi
Kaetsu Mitsuo
Takahashi Tsutomu
Yoshito Kazumasa
Katten Muchin Zavis Roseman
Lindinger Michael L.
Martin David
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