USRE43774E1 - Systems and methods of identifying patch cord connections in a communications patching system using common mode transmission - Google Patents
Systems and methods of identifying patch cord connections in a communications patching system using common mode transmission Download PDFInfo
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- USRE43774E1 USRE43774E1 US13/206,662 US201113206662A USRE43774E US RE43774 E1 USRE43774 E1 US RE43774E1 US 201113206662 A US201113206662 A US 201113206662A US RE43774 E USRE43774 E US RE43774E
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- patch
- patch cord
- signal
- conductors
- common mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/02—Constructional details
- H04Q1/13—Patch panels for monitoring, interconnecting or testing circuits, e.g. patch bay, patch field or jack field; Patching modules
- H04Q1/135—Patch panels for monitoring, interconnecting or testing circuits, e.g. patch bay, patch field or jack field; Patching modules characterized by patch cord details
- H04Q1/136—Patch panels for monitoring, interconnecting or testing circuits, e.g. patch bay, patch field or jack field; Patching modules characterized by patch cord details having patch field management or physical layer management arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/02—Constructional details
- H04Q1/14—Distribution frames
Definitions
- the present invention relates generally to communications systems and, more particularly, to communications patching systems.
- the dedicated communications system is hard wired using telecommunication cables that contain conductive wires.
- dedicated wires are coupled to individual service ports throughout the building.
- the wires from the dedicated service ports extend through the walls of the building to a communications closet or closets.
- the communications lines from the interface hub of a main frame computer or network and the telecommunication lines from external telecommunication service providers may also terminate within a communications closet.
- the communications line may comprise, for example, a communications cable or patch cord that contains four twisted pairs of conductors.
- a patching system is typically used to interconnect the various telecommunication lines within a communications closet.
- the telecommunication lines are terminated within a communications closet in an organized manner.
- the organized terminations of the various lines are provided via the structure of the communications closet.
- a mounting frame having one or more racks is typically located in a communications closet. The communications lines terminate on the racks, as is explained below.
- FIG. 1 a typical prior art rack 10 is shown.
- the rack 10 retains a plurality of patch panels 12 that are mounted to the rack 10 .
- port assemblies 14 On each of the patch panels 12 are located port assemblies 14 .
- the illustrated port assemblies 14 each contain six telecommunication connector ports 16 (e.g., RJ-45 ports), although other numbers of ports are possible (e.g., one, four, or eight ports per port assembly, etc.).
- Other types of patch panels are known, including patch panels with optical fiber ports (e.g., SC, ST, and FC ports) and copper wire ports.
- Each telecommunication connector port 16 may be hard wired to a respective one of the communications lines. Accordingly, each communications line terminates on a patch panel 12 in an organized manner. In small patch systems, communications lines may terminate on the patch panels of the same rack. In larger patch systems, multiple racks may be used. Interconnections between the various communications lines are made using patch cords 20 . Both ends of each patch cord 20 are terminated with connectors 22 , such as, for example, an RJ-45 or RJ-11 connector. One end of a patch cord 20 is connected to a connector port 16 of a first communications line terminating at a first patch panel and the opposite end of the patch cord 20 is connected to a connector port 16 of a second communications line terminated at a second patch panel. By selectively connecting the various lines with patch cords 20 , any combination of communications lines can be interconnected.
- employees are assigned their own computer network access number exchange so that the employee can interface with a main frame computer or computer network.
- patch cords in a telecommunication closet are rearranged so that the employee's old exchanges are now received in his/her new office.
- the patch cords in a typical communications closet are rearranged quite often.
- the interconnections of the various patch cords in a communications closet are often logged in either a paper or computer based log.
- technicians may neglect to update the log each and every time a change is made.
- the log may become less than 100% accurate and a technician may not have a way of reading where each of the patch cords begins and ends.
- the technician may be necessary for the technician to manually trace that patch cord between two connector ports. To perform a manual trace, the technician locates one end of a patch-cord and then manually follows the patch cord until he/she finds the opposite end of that patch cord. Once the two ends of the patch cord are located, the patch cord can be positively identified.
- One existing method of detecting the connector ports that a patch cord is connected to utilizes a mechanical switch in each connector port of a patch panel.
- Each mechanical switch is configured to detect insertion and removal of a patch cord connector within and from a respective connector port. For example, when a patch cord connector is inserted within a connector port of a patch panel, the mechanical switch in the connector port is closed and a signal is generated. It is assumed that when two consecutive connections are made between two different patch panels, a connection exists between the connector ports via the patch cord. The advantage of this method is that special patch cords are not required. Unfortunately, however, this method cannot confirm that there is an actual connection between two connector ports and a patch cord.
- two separate patch cords may have connectors that were inserted within respective connector ports of two patch panels sequentially in time.
- the conventional method would assume that the two connector ports were connected by the same patch cord, which would be erroneous. Accordingly, a need exists for accurately and quickly detecting and identifying patch cord connections in a communications system.
- a communications patching system includes first and second patch panels, each having a plurality of connector ports, and a patch cord that is configured to selectively interconnect a connector port in the first patch panel with a connector port in the second patch panel.
- Each patch panel includes a port identification circuit that is electrically coupled with the connector ports of the respective patch panel.
- the port identification circuit of each patch panel is configured to transmit a signal (e.g., an AC signal, a DC signal, etc.) to a connector port of the other patch panel over a common mode transmission path of a patch cord, and to acknowledge receipt of a signal from a port identification circuit of the other patch panel over the common mode transmission path.
- the first and second connector ports connected by the patch cord are identified from the signal path.
- a database is provided that logs patch cord interconnections with connector ports of the first and second patch panels.
- Embodiments of the present invention are advantageous because the port identification circuit of each patch panel is configured to transmit and receive a signal over the common mode transmission path of a patch cord simultaneously with data transmission over a differential mode transmission path of the patch cord.
- a method of identifying the physical location of patch cord connectors in a communications patching system includes transmitting a signal from a first patch panel connector port to a second patch panel connector port over a common mode transmission path of a patch cord that interconnects the first and second patch panels; acknowledging receipt of the signal at the second patch panel connector port to the first patch panel connector port over the common mode transmission path; and identifying the first and second patch panel connector ports from the signal path.
- the physical location of the patch cord connectors can be logged within a database.
- Embodiments of the present invention may be utilized with any type of patch panel and corresponding patch cords including, but not limited to, patch panels with RJ-45 and RJ-11 ports and patch panels with copper wire ports.
- FIG. 1 is a perspective view of a typical prior art communications rack assembly containing multiple patch panels with connector ports that are selectively interconnected by patch cords.
- FIG. 2 illustrates a communications patching system configured to identify the physical location of patch cord connectors, according to some embodiments of the present invention.
- FIG. 3 is an electrical schematic view of common mode transmission over a patch cord.
- FIG. 4 illustrates a communications patching system configured to identify the physical location of patch cord connectors, according to some embodiments of the present invention, wherein different pairs of a common mode transmission path use a center tapped inductor with two ends of the inductor connected to two wires of a pair.
- first”, “second”, etc. may be used herein to describe various elements, components, patch panels, etc.
- these elements, components, patch panels etc. should not be limited by these terms. These terms are only used to distinguish one element, component, patch panel etc. from another element, component, patch panel.
- a “first” element, component, patch panel discussed below could also be termed a “second” element, component, patch panel without departing from the teachings of the present invention.
- the sequence of operations (or steps) is not limited to the order presented in the claims or figures unless specifically indicated otherwise.
- the information signals are typically transmitted over a pair of conductors (hereinafter a “differential pair” or simply a “pair”) rather than a single conductor.
- the signals transmitted on each conductor of the differential pair have equal magnitudes, but opposite phases, and the information signal is embedded as the voltage difference between the signals carried on the two conductors.
- This transmission technique is generally referred to as “balanced” transmission.
- each conductor in a differential pair often may pick up approximately the same amount of noise from these external sources. Because approximately an equal amount of noise is added to the signals carried by both conductors of the differential pair, the information signal is typically not disturbed, as the information signal is extracted by taking the difference of the signals carried on the two conductors of the differential pair; thus the noise signal may be cancelled out by the subtraction process.
- communications patching systems which quickly and automatically identify the patch panel ports to which each patch cord are connected.
- patching systems are provided that include port identification circuits that transmit and/or receive signals over a common mode transmission path in order to identify port pairs that are connected by a patch cord.
- a common mode signal transmitted over a differential pair adds the same amount of signal energy to each wire of the differential pair, the common mode signal subtracts out of, and hence does not degrade, the differential information signal. Accordingly, by transmitting a common mode signal over the differential pairs that are already part of conventional patching systems it is possible to automatically and accurately keep track of the port connections in a patching system.
- a communications patching system 100 includes first and second patch panels 112 , 114 , each having multiple connector ports (e.g., RJ-45 ports, RJ-11 ports, etc.) 16 , one or more patch cords 20 , one or more port identification circuits 130 electrically coupled with the connector ports 16 , rack control panels 132 , and a database 140 that monitors and logs patch cord interconnections with the connector ports 16 .
- Patch cord 20 is configured to selectively interconnect a connector port 16 in the first patch panel 112 with a connector port 16 in the second patch panel 114 .
- the patch cord 20 includes opposite ends and a respective connector 22 secured to each end, as illustrated. Each connector 22 is configured to be removably secured within a connector port 16 .
- the port identification circuit 130 of each patch panel 112 , 114 is configured to transmit a signal (e.g., an AC signal, a DC signal, etc.) through a connector port 16 and to the port identification circuit 130 of the other patch panel 112 , 114 over a common mode transmission path of the patch cord 20 .
- Each port identification circuit 130 may also be configured to acknowledge receipt of a signal from a connector port 16 of the other patch panel 112 , 114 over the common mode transmission path.
- the physical location of the patch cord connectors 22 can then be identified (i.e., the connector ports 16 in the first and second patch panels 112 , 114 connected by the patch cord 20 are identified) from the common mode transmission path. Accordingly, the connector ports 16 in two patch panels 112 , 114 connected by the patch cord 20 can be positively identified.
- Exemplary communication mechanisms include, for example, where the port identification circuit 130 connects the common mode transmission path of the two pairs together for a time period t, representing a digital zero. A digital one would be an open circuit between the common mode transmission path of the two pairs. At other times the port identification circuit 130 would monitor the common mode connection of the two wire pairs for a digital zero. To avoid overlapping zeros from the two ends of a patch cord 20 , each port identification circuit 130 would transmit the digital zero at random intervals. If the port identification circuit 130 receives a digital zero of time period t then it will return a digital zero of time period 3t, as a method of acknowledgement to the other end.
- the port identification circuit 130 receives a digital zero whose time period is 3t then it knows that a patch cord 20 is connected to another port.
- One method to uniquely identify the port connection is to only allow one port identification circuit 130 to return an acknowledgement at a time. Once the connection has been established, one method to monitor the patch cord connection is the port identification circuit 130 that received the acknowledgement would then maintain a digital zero. At the other end of the patch cord 20 the port identification circuit 130 would monitor this to determine when a patch cord 20 is removed.
- an alternate method is to use a mechanical or electrical switch to identify when a patch cord 20 has been inserted or removed from a connector port 16 and at that time start or stop the port identification circuit 130 .
- alternate methods of communication may include using AC signals which could be on and off or modulated.
- a separate rack control panel 132 would reside in each rack, and includes a microprocessor to communicate to each connector panel (e.g., 112 , 114 , etc.) and the port identification circuit 130 via a shared serial bus connected to each connector panel.
- the number of connector panels controlled by a rack control panel 132 would include all connector panels that are attached to the rack.
- the illustrated patching system 100 also includes a database 140 that communicates with the rack control panel 132 on each rack. Each rack control panel 132 communicates to the database when a port 16 receives a digital zero or an acknowledgement, and when a patch cord 20 is disconnected. The physical location of the port 16 would be included in the communication.
- the database 140 notifies the rack control panel 132 when an acknowledgement can be sent by a port 16 and when a patch cord 20 has been disconnected from a port 16 .
- the database 140 is configured to log patch cord interconnections with connector ports 16 of the first and second patch panels 112 , 114 .
- Database 140 may be any type of database and may include multiple databases. Database 140 may be implemented by any of various known data storage technologies, without limitation.
- a database is a collection of data that is organized in “tables.”
- a database typically includes a database manager that facilitates accessing, managing, and updating data within the various tables of a database.
- Exemplary types of databases that can be used for logging the location of the patch cord connectors in a communications patching system include, but are not limited to, relational databases, distributed databases (databases that are dispersed or replicated among different points in a network), and object-oriented databases. Relational, distributed, and object-oriented databases are well understood by those of skill in the art and need not be discussed further herein.
- Exemplary commercial databases that can be used to implement embodiments of the present invention include, but are not limited to, IBM's DB2® database, Microsoft's SQL server database, and other database products, such as those from Oracle, Sybase, and Computer Associates.
- common mode transmission of a signal over a patch cord is illustrated.
- a common mode transmission sends the same signal across each conductor of a pair in the same direction.
- a signal is transmitted over the wires of cable pair 1 in the direction D 1 and the signal returns over the wires of cable pair 2 in the direction D 2 .
- LAN data is transmitted between endpoints using differential mode transmission.
- differential mode and common mode transmission can coexist and not interfere with each other.
- a signal is transmitted over the common mode transmission path of the patch cord 20 between the endpoint connections (i.e., connector ports 16 ) in the patch panels 112 , 114 .
- a transmitted signal may be a DC signal or an AC signal. Connection to the different pairs of the common mode transmission path could use a center tapped inductor 150 with two ends of the inductor 150 connected to the two wires of a pair, where one center tap of one pair is the positive and the center tap of the second pair is the negative of the common mode transmitting and receiving signal.
- a balanced set of passive components such as resistors and/or capacitors attached to each wire and connected together to form a center tapped component.
- a balanced set of active devises such as matched transistors could also be used.
- each wire of the pairs may be AC coupled between the two center tapped inductors and the Ethernet device.
- the inductor 150 and associated electronics can reside on the connector board of each of the patch panels 112 , 114 , or a separate board attached to the connector board.
- the port identification circuit 130 could consist of a micro controller or random logic. The circuit would generate and receive the signal that is transmitted over the common mode connection of the patch cord. In addition the port identification circuit 130 will communicate to the rack control panel 132 on any changes to the connector ports 16 or a control button operation and receive authorization to send an acknowledgement or release a port 16 when the patch cord 20 has been disconnected.
- the port identification circuit 130 could be duplicated for each connector port 16 or be shared across many ports 16 through a multiport multiplexer.
- the rack control panel 132 would first determine the physical location of each connector panel (e.g., 112 , 114 , etc.). One method is when the rack is first powered up, the user would press a control button on each connector panel starting at the top of the rack working down to the bottom connector panel. This would be tracked by the rack control panel 132 , converted to a physical address, and communicated back to the port identification circuit 130 on each connector panel to be retained as the panel address. This is combined with the port address on each connector panel which is fixed by the physical location on the actual panel. The port identification circuit 130 would then convey the panel and port address to the rack control panel 132 with any communication. The identification of each rack control panel 132 could be set as a selectable unique address. The rack control panel 132 would convey this address, along with the panel and port address to the database along with any information on the connector port.
- each connector panel e.g., 112 , 114 , etc.
Abstract
Description
Claims (39)
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US13/206,662 USRE43774E1 (en) | 2007-04-12 | 2011-08-10 | Systems and methods of identifying patch cord connections in a communications patching system using common mode transmission |
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US11/786,516 US7573254B2 (en) | 2007-04-12 | 2007-04-12 | Systems and methods of identifying patch cord connections in a communications patching system using common mode transmission |
US13/206,662 USRE43774E1 (en) | 2007-04-12 | 2011-08-10 | Systems and methods of identifying patch cord connections in a communications patching system using common mode transmission |
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US11/786,516 Reissue US7573254B2 (en) | 2007-04-12 | 2007-04-12 | Systems and methods of identifying patch cord connections in a communications patching system using common mode transmission |
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CN (1) | CN101682800B (en) |
DE (1) | DE112008000981T5 (en) |
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2007
- 2007-04-12 US US11/786,516 patent/US7573254B2/en not_active Ceased
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2008
- 2008-04-03 WO PCT/US2008/004325 patent/WO2008127564A1/en active Application Filing
- 2008-04-03 CN CN2008800114147A patent/CN101682800B/en not_active Expired - Fee Related
- 2008-04-03 DE DE112008000981T patent/DE112008000981T5/en not_active Withdrawn
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2009
- 2009-07-21 IL IL199980A patent/IL199980A0/en unknown
- 2009-08-14 GB GB0914194A patent/GB2459224B/en not_active Expired - Fee Related
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2011
- 2011-08-10 US US13/206,662 patent/USRE43774E1/en active Active
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Also Published As
Publication number | Publication date |
---|---|
DE112008000981T5 (en) | 2010-02-18 |
US7573254B2 (en) | 2009-08-11 |
IL199980A0 (en) | 2010-04-15 |
GB2459224B (en) | 2010-08-11 |
WO2008127564A1 (en) | 2008-10-23 |
CN101682800A (en) | 2010-03-24 |
GB0914194D0 (en) | 2009-09-16 |
CN101682800B (en) | 2013-01-02 |
US20080253556A1 (en) | 2008-10-16 |
GB2459224A (en) | 2009-10-21 |
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