WO2021202587A1 - Bladed panel system with port occupancy monitoring - Google Patents

Abstract

A termination arrangement includes port monitoring including port occupancy sensors that convey signals aggregated at an interface connector for the termination arrangement. Multiple termination arrangements can be connected to an aggregation device so that port occupancy signals can be sent to a port monitoring network. One or more termination arrangements can be disposed on trays that are movable (e.g., slidable) relative to a chassis to form a communications panel. The port monitoring components may be integrated with the termination arrangement.

Description

BLADED PANEL SYSTEM WITH PORT OCCUPANCY MONITORING Cross-Reference to Related Application This application is being filed on March 30, 2021 as a PCT International Patent Application and claims the benefit of U.S. Patent Application Serial No. 63/002,526, filed on March 31, 2020, the disclosure of which is incorporated herein by reference in its entirety. Background The expansion of the Internet has led to a growing need for large data center operations. Businesses making sales and/or providing services over the Internet typically require high-speed Internet connectivity, tight information security and non-stop operation. Major Internet-based companies such as large online retailers, Internet portals and search engine companies run large “Internet data centers” that host the thousands of servers and the other computer equipment necessary to provide large numbers of users simultaneous, secure, high-speed, fail-safe access to their web sites. Many small to medium-sized businesses may not have the resources and/or sophistication required to install and maintain the equipment necessary to provide such Internet-based access to their servers. Such businesses may also find it difficult to provide and maintain the highly trained, 24-hour a day staff that are typically necessary to repair or replace defective equipment (e.g., servers, cables, patch cords, computer cards, etc.), add new equipment, update outdated equipment and otherwise run a data center. As computer equipment is, for example, added, moved or replaced in a data center, it often becomes necessary to make temporary and/or permanent changes to the interconnection scheme. Conventionally, the interconnections of the various equipment using cables were logged in a paper or a computer-based log. However, if a technician neglects to update the log each and every time a change is made, and/or makes errors in logging changes, then the paper or computer based logs will no longer be fully accurate. As a result, in some cases, each time a technician needs to change a patch cord, the technician would manually trace that patch cord between two connector points by locating one end of the patch cord and then manually following the patch cord until he/she finds the opposite end of that patch cord. However, in large scale data center operations the manual tracing of patch cords may be difficult or even impossible given the large number of connections, the cable routing mechanisms that are typically used to keep the cable portions of each patch cord out of the way and neatly routed and the spacing of the equipment. As such, systems for automatically detecting and logging patch cord connections have been proposed. Improvements are desired. Summary Some aspects of the present disclosure are directed to a termination arrangement including an integrated port monitoring arrangement. The termination arrangement includes at least a plurality of ports (e.g., optical connector ports, electrical connector ports, hybrid connector ports, etc.). The port monitoring arrangement includes a port occupancy sensor disposed at one or more of the ports. Information from the sensor is provided to an interface connector carried by the termination arrangement. In certain implementations, an interface cable can be connected to the interface connector to extend between the termination arrangement and an aggregation device (e.g., a processor). In certain examples, the interface cable is an electrical cable that conveys information from the interface connector of the termination arrangement to the aggregation device. In certain examples, the aggregation device includes a network interface device. Accordingly, the aggregation device conveys the information from the interface connector to a network (e.g., a monitoring network). One or more termination arrangements can be disposed on trays, shelves, or other installation surfaces. The port monitoring arrangement of each termination arrangement is carried by the termination arrangement so that the port monitoring arrangement mounted to the tray, shelf, or other installation surface when the termination arrangement is mounted to the installation surface. The port monitoring arrangement is removed from the installation surface when the termination arrangement is removed from the installation surface. In certain implementations, the interface connectors of two or more of the termination arrangements can be coupled together using an intermediate cable. In such cases, the network connector of only one of the termination arrangements is coupled to the aggregation device using an interface cable. Such a configuration reduces the number of interface cables routed to the aggregation device from each installation surface. In certain examples, only one interface cable is routed between each installation surface and the aggregation device. In certain implementations, the installation surface is a tray (i.e., blade) that is movably mounted to a chassis to form a communications panel. In certain examples, the tray slides along a forward-rearward axis relative to the chassis. The tray carries one or more termination arrangements so that the termination arrangement(s) slide in unison with the tray relative to the chassis. In certain examples, the chassis receives a plurality of trays that each receive one or more termination arrangements. In certain examples, the aggregation device is mounted to the chassis and receives an interface cable from at least each tray to connect the aggregation device to each of the termination arrangements of the communications panel. A variety of additional inventive aspects will be set forth in the description that follows. The inventive aspects can relate to individual features and to combinations of features. It is to be understood that both the forgoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the broad inventive concepts upon which the embodiments disclosed herein are based. Brief Description of the Drawings The accompanying drawings, which are incorporated in and constitute a part of the description, illustrate several aspects of the present disclosure. A brief description of the drawings is as follows: FIG.1 is top perspective view of an example termination arrangement including a port monitoring arrangement having a first type of second circuit board positioning an interface connector at a front of the termination arrangement; FIG.2 is an exploded view of the front of the termination arrangement of FIG.1; FIG.3 is a bottom perspective view of exploded components of FIG.2; FIG.4 is a bottom perspective view of the termination arrangement of FIG. 1 with the second circuit board exploded away from an outer housing; FIG.5 is a perspective view of an example first type of second circuit board; FIG.6 is a bottom plan view of the termination arrangement of FIG.1; FIG.7 is a top perspective view of the termination arrangement of FIG.1 with a cover removed to show various components within the outer housing; FIG.8 shows two of the termination arrangements of FIG.1 interconnected by an intermediate cable and mounted to an example tray; FIG.9 is a top perspective view of the termination arrangement of FIG.1 except the port monitoring arrangement has a second type of second circuit board positioning the interface connector at one side of the termination arrangement; FIG.10 is a bottom perspective view of the termination arrangement of FIG.9 with the second type of second circuit board exploded away from the outer housing; FIG.11 is a perspective view of an example second type of second circuit board; FIG.12 is a bottom plan view of the termination arrangement of FIG.9; FIG.13 shows two of the termination arrangements of FIG.9 interconnected by an intermediate cable and mounted to an example tray; FIG.14 is a schematic diagram of an example communications panel including multiple trays mounted to a chassis having an aggregation device; and FIG.15 is a circuit diagram showing how the first circuit boards and second circuit boards of two interconnected termination arrangements are electrically coupled to an aggregation device. Detailed Description Reference will now be made in detail to exemplary aspects of the present disclosure that are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. The present disclosure is directed to a termination arrangement 100 including a plurality of ports 102 having port openings 104 accessible from an exterior of the termination arrangement. A port monitoring arrangement is operatively coupled to the termination arrangement 100 as a unit to move with the termination arrangement 100. The port monitoring arrangement detects when a plug connector is received at one or more of the ports 102. The port monitoring arrangement conveys this detection to an interface connector 118 associated with the termination arrangement 100. The ports 102 are formed by one or more port bodies 112 defining the port opening 104. In some implementations, the ports 102 are optical ports configured to receive optical plug connectors. In certain implementations, the bodies 112 of the optical ports 102 include optical adapters. In some examples, a port 102 of an optical adapter 112 is configured to receive a single-fiber plug connector. In other examples, a port 102 of an optical adapter 112 is configured to receive a multi-fiber plug connector. In other implementations, the ports 102 are electrical ports defined by one or more electrical sockets (e.g., jack sockets). In still other implementations, the ports 102 are configured to receive hybrid (e.g., opto-electrical) plug connectors. In certain implementations, the port monitoring arrangement includes one or more port occupancy sensors 108 associated with the ports 102 (e.g., see FIG.3). For example, each of the port occupancy sensors 108 is aligned with a corresponding one of the ports 102. In certain examples, each port occupancy sensor 108 extends into the corresponding port 102 so to be accessible to a plug connector received at the port 102. For example, each port occupancy sensor 108 may include a micro-switch having an actuator 110 extending into the port 102. The port occupancy sensor 108 does not extend through the port opening 104. In certain implementations, the port monitoring arrangement includes a first circuit board 106 to which the one or more port occupancy sensors 108 are mounted. The first circuit board 106 mounts to the bodies 112 of the ports 102. In the example shown, the first circuit board 106 mounts across the optical adapters 112 so that the port occupancy sensors 108 aligns with openings 114 in the optical adapters 112 that are separate from the port openings 104 (see FIG.2). Each port occupancy sensor 108 extends through a corresponding one of the openings 114 and into the port 102. In certain implementations, the port monitoring arrangement includes a second circuit board 116, 150 that electrically connects to the first circuit board 106. The second circuit board 116, 150 carries the interface connector 118 so that the interface connector 118 moves with the second circuit board 116. Detection information (i.e., indicating whether or not a plug is detected at the port 102) is conveyed from each port occupancy sensor 108, through the first circuit board 106, through the second circuit board 116, 150, to the interface connector 118. The interface connector 118 is configured to receive a connectorized end of a cable (e.g., an interface cable, an intermediate cable, etc.). In certain examples, one end of the second circuit board 116 connects to the electrical connector arrangement 126 and the opposite end of the second circuit board 116 supports the interface connector 118. The second circuit board 116, 150 is carried with the termination arrangement 100 to move with the termination arrangement 100 as a unit. In certain implementations, the termination arrangement 100 includes an outer housing 120 that engages the bodies 112 of the ports 102. In certain implementations, the outer housing 120 extends along a width W between a first side 121 and a second side 123 (see FIG 6) along a depth D between a front 125 and a rear 127 (see FIG.6), and along a height H (FIG.1) between a top and a bottom 129. In certain examples, the ports 102 are front ports located at the front 125 of the outer housing 120. The outer housing 120 includes a base 122 to which the port bodies 112, 162 are coupled. For example, the port bodies 112 may be latched or otherwise secured to the base 122. In certain implementations, the outer housing 120 includes a cover 124 that mounts to the base 122 to define an interior of the outer housing 120. For example, the cover 124 may mount to a peripheral wall extending upwardly from the base 122. In some implementations, the cover 124 is removable from the base 122 to allow a user to access the interior. In other implementations, the cover 124 is not removable from the base 122. One or more connection and/or management components (e.g., storage spools, bend radius limiters, optical splice holders, optical splitters, electrical splitters, opto-electrical converters, etc.) may be disposed within the interior. In some implementations, the outer housing 120 is a cassette housing that is configured to receive one or more cables (e.g., data cables carrying signals between a central office and subscribers) that are optically coupled to the ports 102 within the cassette housing 120. For example, optical fibers of the one or more cables can be connectorized and plugged into internal ports of the optical adapters 112 defining the ports 102. In another example, optical fibers of the one or more cables can be optically spliced (e.g., fusion spliced) to connectorized pigtails plugged into internal ports of the optical adapters 112 defining the ports 102. In another example, electrical wires of the one or more cables can be terminated at the jacks 112 defining the ports 102 to electrically connect the cable to the ports 102. In certain examples, the ports 102 are front ports disposed at the front 125 of the outer housing 120. In certain examples, the one or more cables extend into the interior of the outer housing 120 through the rear 127 of the outer housing 120. In certain examples, the cover 124 of the cassette housing 120 is a removable cover 124. Removing the cover 124 from the base 122 provides access to the interior of the cassette housing 120 (e.g., see FIG.7). In certain examples, one or more bend radius limiters 130 are disposed within the interior. In certain examples, one or more splice holders 132 are disposed within the interior. In certain examples, one or more guide fingers 134 are disposed within the interior. In some examples, the cover 124 extends over the port bodies 122. In other examples, the port bodies 122 are disposed outside the cover 124 In other implementations, the outer housing 120 includes a module housing that holds or defines a second port accessible from an exterior of the module housing 120. The second port is connected to the ports 102 via circuitry within the module housing 120. Accordingly, a connectorized cable can be plugged into the second port and signals/power from the connectorized cable can be provided at the ports 102 of the termination arrangement 100. In certain examples, the ports 102 are front ports accessible from the front 125 of the outer housing 120 and the second port is a rear port accessible from the rear 127 of the outer housing 120. In certain examples, the port bodies 112 are coupled to a top of the base 122 and the second circuit board 116, 150 of the port monitoring arrangement is coupled to the bottom 129 of the base 122 so that the base 122 extends between the port bodies 112 and the second circuit board 116, 150. In certain examples, the second circuit board 116, 150 is mounted within a channel 128 recessed into the bottom 129 of the base 122. In certain implementations, the second circuit board 116, 150 is electrically connected to the first circuit board 106 via an electrical connector arrangement 126. In certain examples, the electrical connector arrangement 126 extends through the base 122 of the outer housing 120. For examples, the base 122 may define at least one aperture 136 through which the electrical connector arrangement 126 extends. In certain examples, a first part of the electrical connector arrangement 126 is carried with the first circuit board 106 and a second part of the electrical connector arrangement 126 is carried with the second circuit board 116, 150. The two parts are pushed together within the aperture 136 when the termination arrangement 100 is assembled. In certain examples, the first circuit board 106 is mounted to the port bodies 112 to move with the port bodies 112 as a unit. In certain examples, a cover 113 is mounted to the port bodies 112 to sandwich the first circuit board 106 between the port bodies 112 and the cover. Examples units including port bodies 112, first circuit boards 106, and covers 113 suitable for use with the termination arrangements 100 disclosed herein are described in U.S. Patent Nos.9285552, 10571641, 9804337, the disclosures of which are hereby incorporated herein by reference in their entirety. In certain examples, the port bodies 112, the first circuit board 106, and the cover 113 are mounted to the top of outer housing base 122 as a unit and the second circuit board 116, 150 is mounted to the bottom of the base 122. Examples of outer housings 120 suitable for use with the termination arrangement 100 are described in U.S. Publication No.2020/0073070, the disclosure of which is hereby incorporated herein by reference in its entirety In certain implementations, the interface connector 118 of the second circuit board 116, 150 is disposed external of the outer housing 120 so as to be accessible from the exterior of the outer housing 120. For example, the second circuit board 116, 150 may protrude beyond the base 122 of the outer housing 120. In some implementations, the interface connector 168 of the second circuit board 150 is disposed at the front 125 of the outer housing 170 (e.g., see FIGS.1-8). In other implementations, the interface connector 118 of the second circuit board 116 is disposed at one of the first and second sides 121, 123 of the outer housing 120 (e.g., see FIGS.9-13). In certain implementations, the base 122 is configured to selectively receive two or more types of second circuit board 116, 150. For example, the channel 128 recessed into the base 122 may be sized and shaped to receive any of multiple types of second circuit boards 116, 150. The different types of second circuit boards 116, 150 fit differently within the channel 128 to position the interface connector 118 at a different location relative to the outer housing 120. In certain examples, the channel 128 extend from a peripheral edge at the front of the outer housing 120 to the peripheral edge at one of the opposite sides of the outer housing. An example first type of second circuit board 116 is shown in FIG.5. The first type of second circuit board 116 includes a planar section extending between opposite ends. One of the ends connects to the electrical connector 126 and the opposite end of the second circuit board 116 supports the interface connector 118. In an example, the second circuit board 116 is T-shaped. An example second type of second circuit board 150 is shown in FIG.11. The second type of second circuit board 150 includes multiple segments angled relative to each other. The second type of second circuit board 150 is sized to extend over at least a majority of the depth D of the outer housing 120. In certain examples, the second circuit board 150 is sized to extend over at least half of the width W of the outer housing 120. In certain examples, the electrical connector 126 is disposed at an intermediate location within the channel 128. Accordingly, the channel 128 includes a first section extending away from the electrical connector 126 in a first direction and a second section extending away from the electrical connector 126 in a second direction. The first type of second circuit board 116 is mountable in the first section of the channel 128 and the second type of second circuit board 150 is mountable in the second section of the channel 128. For example, the first section of the channel 128 may extend from the electrical connector 126 to the front 125 of the base 122 while the second section of the channel 128 extends from the electrical connector 126 to the first side 121 or the second side 123 of the base 122. In certain examples, the channel 128 is shaped to enable the same second circuit board 150 to be selectively disposed in any of at least two orientations. In the example shown, the channel 128 extends from the electrical connector 126 towards both of the opposite sides 121, 123 of the base 122 in a Y-shape. Accordingly, the second circuit board 116 can be mounted in the channel 128 to extend to the peripheral edge at the first side 121 of the base 122 and alternatively can be mounted in the channel 128 to extend to the peripheral edge at the second side 123 of the base 122. In certain implementations, one or more of the termination arrangements 100 can be mounted to a tray 160 or other installation site (e.g. see FIGS.8, 13, and 14). In certain examples, the tray 160 is configured to mount within a chassis 180 (FIG.14) to form a communications panel. The tray 160 includes a base 162 to which the one or more termination arrangements 100 mount. The tray 160 also includes rails, slides, or other guides 164 that engage features within the chassis 180 to allow the tray 160 to mount within the chassis. In certain examples, the tray is configured to slide relative to the chassis 180 about a slide axis that extends parallel to the depth D of the termination arrangements 100. The termination arrangement(s) 100 are carried by the tray 160 to move in unison with the tray 160. In some examples, each termination arrangement 100 snap-fits (e.g., latches) to the tray 160. In other examples, each termination arrangement 100 is fastened to the tray 160 using fasteners. In certain examples, the termination arrangement(s) 100 are mounted in fixed positions relative to the tray 160. In certain implementations, the tray 160 includes a latching arrangement 166 to retain the tray 160 in one or more discrete positions relative to the chassis 180. In certain examples, an actuator of the latching arrangement 166 is located at a front of the tray 160. In certain examples, the tray 160 also may include a handle 172 at a rear of the tray 160. The tray 160 also may include cable management structures to guide cables (e.g., data cables) routed to the tray 160. In certain examples, the tray 160 includes cable guides 168 at the front of the tray 160 to guide cables (e.g., data cables) routed to the ports 102 of the termination arrangement(s) 100. In certain examples, the tray 160 included retention fingers 170 at the rear of the tray 160 to guide cables (e.g., distribution cables) routed to the rear 127 of the termination arrangement(s) 100. In the example shown in FIG.8, a tray 160 includes two termination arrangements 100 that each include the first type of second circuit board 116. The interface connector 118 protrudes from the front 125 of the outer housing 120. An interface cable C is routed to the interface connector 118 of at least one of the termination arrangements 100. Signals indicating port occupancy are conveyed from the port occupancy sensors 108, over the first circuit board 106, over the second circuit board 116, 150, through the interface connector 118, to the interface cable C. The interface cable C can be routed from the interface connector 118 to an aggregation device. As shown in FIG.14, one or more trays 160 can be mounted within a chassis 180. The chassis 180 can be sized to extend over 1 rack unit (RU), 2 RU, 3 RU, 4 RU, 5 RU, 6 RU, etc. In certain examples, each tray 160 extends across a width of the chassis 180. In certain examples, the trays 160 can be inserted into the chassis 180 through an open front of the chassis 180. In certain examples, the trays 160 also can be inserted into the chassis 180 through an open rear of the chassis 180. For example, the trays 160 can be slidable relative to the chassis 180. An aggregation device 190 can be disposed at the chassis (e.g., at the rear of the chassis 180). The aggregation device 190 receives the interface cables C from the termination arrangements 100. A network cable can be routed to the aggregation device 190 to carry the signals received over the interface cables C to a port management network. In some implementations, separate interface cables C are routed to the interface connector 118 of each termination arrangement 100. In other implementations, one or more intermediate cables I are routed between the interface connectors 118 of two termination arrangements 100 to interconnect the interface connectors 118. A single interface cable C is routed to the interface connector 118 of one of the interconnected termination arrangements 100 to carry information from both of the interconnected termination arrangements 100 to the aggregation device 190. In certain examples, the intermediate cable I may affect the port address signal of one of the termination arrangements 100, thereby allowing the aggregation device 190 to distinguish the ports 102 of the first termination In certain examples, the port occupancy information is conveyed using an I2C interface and protocol. As shown in FIG.15, the first circuit boards 106 of each termination arrangement 100 has a Position Detection signal. The Position Detection signal of one of the termination arrangements 100 (eg see the top first circuit board 106 in FIG.15) is pulled to a high logic level by a resistor R1. The Position Detection signal of the other termination arrangement 100 (e.g., see the bottom first circuit board 106 in FIG.15) is shorted to ground through the intermediate cable I. In certain examples, the serial shift register integrated circuits (ICs) on the first circuit boards 106 take the Position Detection signal as an input to determine the different port addresses that each IC responds to on an 12C bus. Accordingly, the aggregation device 190 can distinguish the occupancy signals for ports (e.g., ports 1 to 24) of a first interconnected termination arrangement 100 and the occupancy signals for ports (e.g., ports 1 to 24) of a second interconnected termination arrangement 100 even if both termination arrangements 100 have the same port monitoring arrangement (e.g., same circuitry on the first circuit boards 106, same circuitry on the second circuit boards 116, 150, and same interface connectors). Having described the preferred aspects and implementations of the present disclosure, modifications and equivalents of the disclosed concepts may readily occur to one skilled in the art. However, it is intended that such modifications and equivalents be included within the scope of the claims which are appended hereto.

Claims

What is claimed is: 1. A tray arrangement for use with a chassis of a panel system, the tray arrangement comprising: a tray configured to mount to the chassis to be movable relative to the chassis; a termination arrangement mounted to the tray so that the termination arrangement moves in unison with the tray, the termination arrangement including a plurality of front ports and a base; and a port monitoring arrangement including a plurality of port occupancy sensors that align with a respective one of the front ports, a first circuit board to which the port occupancy sensors are mounted, and a second circuit board electrically coupled to the first circuit board, the second circuit board being disposed at an opposite side of the base from the first circuit board, the port monitoring arrangement being operationally coupled to the termination arrangement so that the first circuit board, the second circuit board, and the port occupancy sensors are carried with the termination arrangement, the second circuit board including a connector accessible to a user from an exterior of the termination arrangement when the termination arrangement is mounted to the tray.

2. The tray arrangement of claim 1, wherein the front ports are defined by fiber optic adapters, which also define corresponding rear ports.

3. The tray arrangement of claim 1, wherein the front ports are defined by electrical receptacles.

4. The tray arrangement of any of claims 1-3, wherein the termination arrangement includes a cover removably mounted to the base to form a cassette housing, the front ports being mounted to the cassette housing.

5. The tray arrangement of claim 4, further comprising an optical splice holder disposed within the cassette housing.

6. The tray arrangement of claim 4, further comprising fiber management members disposed within the cassette housing.

7. The tray arrangement of any of claims 4-6, wherein the cassette housing is configured to receive an optical cable at a rear of the cassette housing, wherein the front ports are accessible from a front of the cassette housing.

8. The tray arrangement of any of claims 1-3, wherein the base of the termination arrangement at least partially forms a module housing to which the front ports are mounted, the termination arrangement also including a rear port accessible from an exterior of the module housing, wherein circuitry disposed within the module housing couples the rear port with the front ports.

9. The tray arrangement of claim 8, wherein the front ports are optical single-fiber ports and the rear port is an optical multi-fiber port.

10. The tray arrangement of claim 9, wherein the front ports are defined by first fiber optic adapters mounted at a front of the termination arrangement and the rear port is defined by a second fiber optic adapter mounted at a rear of the termination arrangement.

11. The tray arrangement of any of claims 1-10, wherein the connector of the second circuit board is disposed at a front of the termination arrangement.

12. The tray arrangement of any of claims 1-10, wherein the connector of the second circuit board is disposed at a side of the termination arrangement.

13. The tray arrangement of any of claims 1-12, wherein the termination arrangement is a first termination arrangement and the port monitoring arrangement is a first port monitoring arrangement; wherein a second termination arrangement is mounted to the tray, the second termination arrangement including a plurality of front ports; and wherein a second port monitoring arrangement includes a plurality of port occupancy sensors aligned with the front ports of the second termination arrangement.

14. The tray arrangement of claim 13, further comprising an intermediate cable connecting the connector of the first port monitoring arrangement of the first termination arrangement to a connector of the second port monitoring arrangement of the second termination arrangement

15. The tray arrangement of claim 14, wherein the intermediate cable is routed around a rear of the second termination arrangement.

16. The tray arrangement of claim 14, wherein the intermediate cable is routed in front of the first and second termination arrangements.

17. The tray arrangement of any of claims 3-16, wherein the second circuit board is recessed into the base.

18. The tray arrangement of any of claims 1-17, wherein the second circuit board of the port monitoring arrangement is one of a plurality of second circuit boards, each circuit board being selectively coupled to the termination arrangement in place of the others of the second circuit boards, wherein each of the second circuit boards positions a respective connector at a different location relative to the termination arrangement.

19. A panel system comprising: at least one tray arrangement as claimed in any of claims 1-18; a chassis defining an interior accessible through an open front, the chassis being configured to receive the at least one tray arrangement through the open front, the open front being disposed opposite a rear of the chassis; a chassis processor disposed at the chassis; and a cable that electrically couples the connector of the second circuit board of the at least one tray arrangement to the chassis processor.

20. The tray arrangement of claim 19, and wherein the chassis processor is disposed at the rear of the chassis.

21. A termination arrangement comprising: a base extending along a depth between a front and a rear and along a width between opposite first and second sides, the base having a top and a bottom facing in opposite directions, each of the top and the bottom extending along the depth and the width; a plurality of optical adapters mounted to the base so that the top of the base faces the optical adapters, each of the optical adapters defining at least one front port and at least one rear port; a first circuit board mounted to the optical adapters; a plurality of port occupancy sensors mounted to the first circuit board, each port occupancy sensor extending into a respective one of the optical adapters; and a second circuit board mounted to the bottom of the base to be carried with the base as a unit, the second circuit board being electrically connected to the first circuit board.

22. The termination arrangement of claim 21, wherein the second circuit board is recessed into the bottom of the base.

23. The termination arrangement of claim 21 or claim 22, wherein the second circuit board includes an interface connector accessible from an exterior of the termination arrangement.

24. The termination arrangement of claim 23, wherein the interface arrangement is disposed beyond the depth of the base.

25. The termination arrangement of claim 23, wherein the interface arrangement is disposed beyond the width of the base.

26. The termination arrangement of any of claims 21-25, wherein the second circuit board is linear.

27. The termination arrangement of any of claims 21-25, wherein the second circuit board includes a first portion angled relative to a second portion.

28. The termination arrangement of any of claims 21-27, wherein the base cooperates with a removable cover to form a housing that defines a cable port configured to receive an optical cable.

29. The termination arrangement of any of claims 21-27, wherein the base at least partially forms a housing that carries a second optical adapter that is optically coupled to at least some of the optical adapters by optical circuitry within the housing.

30. The termination arrangement of any of claims 23-29, wherein the second circuit board is recessed into a channel defined along the bottom of the base, the channel extending from the interface connector.

31. The termination arrangement of claim 30, wherein the channel extends from the interface connector towards both of the opposite sides of the base in a Y-shape.

32. The termination arrangement of claim 31, wherein the second circuit board follows only one of the arms in the Y-shaped channel.