Abstract:
An optical network unit includes a central office interface configured to connect to a central office local loop and customer premises and provide a central office source service. A switch and a switch device is connected to the switch and has at least one service port to provide a local source service. A relay switch is connected to the at least one service port and the central office interface. A processor is connected to the switch and relay switch and configured to receive a command message and in response switch into either the central office interface and provide the central office source service or switch into the service port and provide the local source service.

Description:
FIELD OF THE INVENTION 
     The present invention relates to communications systems, and more particularly, this invention relates to managing an Optical Network Unit (ONU). 
     BACKGROUND OF THE INVENTION 
     Service providers often spend considerable money to visit a customer premises such as at a customer&#39;s house and disconnect and connect various data services and customer premises equipment to local customers. This is known in the industry to those skilled in the art as the dreaded truck roll. Often, this could be obviated if there was some technique to remotely manage and configure remotely an ONU, such as from a central office management system. This would be especially applicable when using a reverse powered ONU and allowing the central office management system to send various management messages. 
     SUMMARY OF THE INVENTION 
     An optical network unit includes a central office interface configured to connect to a central office local loop and customer premises and provide a central office source service. A switch and a switch device is connected to the switch and has at least one service port to provide a local source service. A relay switch is connected to the at least one service port and the central office interface. A processor is connected to the switch and relay switch and configured to receive a command message and in response switch into either the central office interface and provide the central office source service or switch into the service port and provide the local source service. 
     In an example, the command message comprises a Simple Network Management Protocol (SNMP) message that is routed through the switch to the processor and in other examples the command message comprises a CLI (Call Level Interface) management message and in yet another example, a command message comprises an OMCI (Open Managed Client Instrumentation) management message. 
     In an example, the switch comprises an Ethernet switch and the command message is transmitted over an Ethernet operations and management layer protocol (ETHOAM) channel. The command message includes a VLAN tag identifier in another example. A memory is included in which the configuration of the relay switch is saved in case power is lost. The optical network unit is also configured to connect to at least one customer premises equipment and receive power therefrom. 
     A communications system is also set forth and includes a central office manager and central office local loop and the optical network unit connected thereto. 
     A method example is also set forth. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Other objects, features and advantages of the present invention will become apparent from the detailed description of the invention which follows, when considered in light of the accompanying drawings in which: 
         FIG. 1  is a block diagram of a communications system that includes the relay, relay control, central office exchange, and customer loop in accordance with a non-limiting example. 
         FIG. 2  is another block diagram example of a communications system similar to  FIG. 1 , but showing other details in accordance with a non-limiting example. 
         FIG. 3  is a schematic block diagram for a relay circuit in accordance with a non-limiting example. 
         FIG. 4  is a message flow diagram in accordance with a non-limiting example. 
     
    
    
     DETAILED DESCRIPTION 
     Different embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown. Many different forms can be set forth and described embodiments should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope to those skilled in the art. 
     In accordance with a non-limiting example, the system permits the disabling of service and switched service to a customer drop remotely without requiring a truck roll. The system uses a remotely managed switching element that resides in an ONU, which in this example is a reverse powered ONU. In accordance with a non-limiting example, it is possible to use management messages such as SNMP (Simple Network Management Protocol), OMCI (Open Managed Client Instrumentation), or CLI (Call Level Interface) management messages sent from a central office management system to configure the remotely managed switching element in the ONU. 
     Generally in a preferred embodiment, a remotely managed switching element is created in the FTTDP (fiber-to-the-distribution point) ONU and remotely configured by SNMP management messages or OMCI, CLI or similar command messages. Preferred elements and functions in a non-limiting example include a latching type switching relay that maintains its state without power being applied. Any relay control circuit is under processor control. A switch such as an Ethernet switch routes an SNMP set or CLI or OMCI command message as a relay message to a local processor on the FTTDP ONU over an Ethernet operations and management layer protocol (ETHOAM) message channel, using in one example a VLAN tag identifier. The system includes separate tip/ring port connections that connect to the latching type switching relay and connect the customer loop to a central office (CO) exchange port on a local Extended Reach Ethernet Service data service port (for example, the Total Reach Ethernet/TRE from ADTRAN, INC. of Huntsville, Ala.). Two central office services that could be provided can be any two-wire (or four-wire) type service served from the central office (CO) exchange. These services could include POTS, ADSL, VDSL, ADSL2, VDSL2, SHDSL, ISDN, HDSL4, and similar services. There could also be services from the local ONU device port (XDSL, VDSL2, ADSL2, POTS, Total Reach Ethernet (TRE) corresponding to an Extended Reach Ethernet Service, and similar services. 
     In one example, a message sent via the SNMP database via the ETHOAM flow selects the state of the relay on each port and is terminated and acted upon by a local processor. Service can be selected to a CO source service, a local TRE port service as a local source service, or disabled by connecting to the local TRE port source and taking the port out of service. In one example, it is possible to use a flash memory device on an ONU board that saves a provisioned relay state during a power failure. This system saves a service provider OPEX (operational expenditures) money by remotely changing customer service ports using a multipart interface at the FTTDP ONU and a managed switching relay element. The system controls dynamically the physical service port connectivity to a customer premise via a management interface. The system also maintains service port connection states during a power outage and saves latching relay switch states via flash memory storage of SNMP MIB data. It is possible that there is a remotely powered fiber optic device that performs servicing and operates as a smart relay and manages the service. As noted before, the ONU is remotely powered in an example. 
       FIG. 1  shows an overall block diagram view of the communications system, in accordance with a non-limiting example, and showing the central office (CO) exchange  20  as a service type 1 and connected to a customer loop  22  and selectable between the central office exchange and the customer loop using the relay  24 . A service type 2 local physical device  26  is connected to the relay by an Extended Reach Ethernet Service port (a TRE service port) in a non-limiting example. A relay control  28  connects to the relay and the local physical device  26  connects to the switch  30 , which in this example, is an Ethernet switch. A processor  32  connects to the relay control  28  and Ethernet switch  30  and interoperates with the relay control and the Ethernet switch, which in turn connects to a selectable fiber optic (SFP) module  34  and a network feed  36  for an optical media converter (OMC) data flow. 
       FIG. 2  shows a block diagram of a basic management model and network architecture. In this example, the illustrated Ethernet switch  30  and processor  32  are the same reference numerals in  FIG. 1 , otherwise the reference numerals for components shown in  FIG. 2  begin in the 40&#39;s. 
     An Operation Support System/Business Support System (OSS/BSS)  40  connects to a central office manager  42  that includes an auto configuration server (ACS)  44  and element management system (EMS)  46  that manages network elements using SNMP. These components could be supplied from ADTRAN, INC. The ACS  44  communicates to at least one customer premises equipment  46  that includes a system-on-chip (SOC) switch  48 . Only one CPE is illustrated, but the ONU typically connects to a plurality of CPE&#39;s. The EMS  46  communicates with a multi-service access and aggregation platform (MSAP)  50  that could be a Total Access 5000 device from ADTRAN, INC. and includes an Ethernet one gigabit (1G) port  52  that communicates over ETHOAM with the FTTDP ONU  54 , which includes the Ethernet switch  30  and processor  32 . The Ethernet 1G port  52  communicates using gigabit Ethernet (GBE) to the Ethernet switch. The OSS/BSS  40  communicates via a Transaction Language 1 (TL-1) protocol with the ACS  44  in one example. A technician  54  communicates with the central office manager  42  using a graphical user interface (GUI). The ACS communicates to a CPE in this example using TR-069 as an application layer protocol such as CPE WAN Management Protocol (CWMP). 
     Greater details of an example relay circuit schematic diagram are shown in  FIG. 3 . The relay switch  24  selects a customer service from the TRE port or a COT source service port such as DSL or POTS. As illustrated, the Ethernet switch  30  connects to the TRE physical device  26  and processor  32  that includes a flash memory  60 . An SNMP set is sent as part of a relay message from the Ethernet switch  30  to the processor  32 . The Ethernet switch receives network gigabit Ethernet (GEE) information through the ETHOAM flow. The TRE physical device  26  in this example connects to other ports and also connects to the TRE service port as part of the latching relay switch as illustrated. The relay elects between the central office loop to a customer premises or TRE service port as illustrated as the COT service port as the COT loop sub as part of the customer drop. 
       FIG. 4  is a message flow diagram showing greater details of a message flow between basic elements of the OSS/BSS, the switch that operates with SNMP and the FTTDP ONU. Various components are illustrated in  FIGS. 1-3 . In one example, a technician enters a change to the service relay state via the GUI or CLI interface to the EMS system. The EMS system generates an SNMP set request message towards the FTTDP ONU using the SNMP management flow. The SNMP message is carried over the ETHOAM and delivered to the FTTDP ONU processor as a management packet. The FTTDP ONU processes the messages, updates the SNMP MIB state, and switches the service relay at the desired port. The FTTDP ONU updates the flash memory and the SNMP MIB table appropriately. The FTTDP ONU sends an ACK message back to the EMS system using an ETHOAM flow back to the EMS system. 
     Many modifications and other embodiments of the invention will come to the mind of one skilled in the art having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is understood that the invention is not to be limited to the specific embodiments disclosed, and that modifications and embodiments are intended to be included within the scope of the appended claims.