Patent Application
20050169631
The invention relates generally to passive optical networks and, more particularly, to facilitating service activation in passive optical networks.
Passive Optical Networking (PON) enables the shared use of fiber for services such as data, voice and video over most of the distance between a central office and service subscriber sites. PON is significantly less expensive to deploy and operate due to the compact size and passive nature of much of the equipment comprised by the PON facilities. For example, a passive optical splitter that fans the fiber out to service subscribers in a PON is relatively small, uses no electronics and requires no power source.
Current and emerging PON solutions offer cost-effective, end-to-end solutions that are capable of delivering a combination of high-demand services. Specific examples of such current and emerging PON solutions include Broadband PON (BPON), Ethernet PON (EPON) and Gigabit PON (GPON). Examples of services that can be provided via such PON solutions include various types of telephony services, data transmission services and video services. Signals for such services are transported optically from the central office (CO) or headend (HE) to an optical-network termination unit (referred to herein as the ONT) at a service subscriber's site. The ONT is configured to provide optical network termination functionality and, in some implementations, to also provide conventional network interface device functionality.
Before a service subscriber can receive requested services via PON, an ONT must be installed at the service subscriber's site and requested services must be activated. The conventional approach for activating service for a particular service subscriber is performed in conjunction with installing the subscriber's ONT. A field technician, commonly referred to as a Craft, carries out physical installation of an ONT (e.g., a ONT having a particular serial number) at a new subscriber's site. After the ONT is installed, the Craft initiates communication with a service activator (i.e., a person) who performs activation of the subscriber's service, with the Craft providing manual provisioning assistance as needed at the subscriber site. Activating the PON services includes provisioning the requested services and associating the provisioned services with the ONT.
The capability of selecting an arbitrary ONT for installation at a customer site provides the operating company with a significant level of flexibility in achieving the goal of quick and efficient service activation. In order to permit the aforementioned installation of an arbitrarily selected ONT, the rest of the PON system needs to receive enough information to associate the newly installed ONT with the particular set of provisioning information required to activate the services requested by the subscriber located where the ONT is installed. One conventional option for accomplishing this is to arrange the system so that the installer of the ONT (i.e., the Craft) provides this information to the ONT manually. Thereafter, the ONT can provide the information to the Optical Line Terminal (OLT) and/or any other management entity in the system, and the proper association of provisioning with the newly installed ONT can then be made automatically by the system.
In some conventional systems, the information manually provided by the installer is a site identifier or other information which identifies the geographic location where the ONT has been installed. The ONT then sends this site identifier/location information together with it's own identification information (for example its serial number) to the OLT/management entities in the system. In response to the ONT identifier and the site identifier, the OLT/management entities in the system can automatically perform the process of associating provisioning with the newly installed ONT.
The installer can utilize several different types of devices to manually provide the site identifier/geographic location information to the ONT, for example, a butt end device or other similar device, or an Ethernet RS 232-based input device. However, any such mechanism which provides manual access to the ONT represents a security risk, because the access port that is used to provide the site identifier/geographic location information is also available to unauthorized users. One way to avoid such a security risk is for the installer to report the site identifier/geographic location information directly to the OLT/management entities of the system, without ever providing the site identifier/geographic location information to the ONT. In this situation, the ONT does not require any mechanism (or the attendant security risk) for permitting the installer to manually provide the site identifier/geographic location information to the ONT.
It is desirable in view of the foregoing to be able to provide the ONT's identity and its site identifier to an OLT/management entity without manually inputting the site identifier to the ONT and without requiring the installer to manually report the site identifier to the OLT/management entity.
Exemplary embodiments of the present invention permit the ONT to determine its own geographic location information automatically, so the ONT can report its identity and its geographic location information to an OLT/management entity automatically, without manual intervention.
Referring now to
A BPON system, the current global standard for passive optical networking systems, is a combination of PON and Wavelength Division Multiplexing (WDM) solutions. PON enables the shared use of fiber for services such as data voice and video over most of the distance between a central office and service subscriber sites. Wavelength Division Multiplexing (WDM) divides light signals into different colors (i.e., wavelengths) and enables bi-directional transmission over a single fiber. WDM enables multiple transmissions to and from service subscriber sites to travel as different colors of light over the same fiber using multiplexing and demultiplexing techniques, thus allowing a single fiber connection to serve multiple service subscribers. Each color of light has its own wavelength and its own frequency. The electronic equipment on each end of the fiber can distinguish the different signals by their color. Accordingly, a first wavelength of light (i.e., a first color) may be used for transmitting information in a first direction through a fiber of the fiber distribution apparatus 715 (e.g., toward the subscriber site apparatus 710) and a second wavelength of light (i.e., a second color) may be used for transmitting information in a second direction through a fiber of the fiber distribution apparatus 715 (e.g., toward the central office apparatus 705).
The central office apparatus 705 facilitates the transmission of information between the subscriber site apparatus 710 and a core network (i.e., a network including various public networks such as the Internet and private networks). The central office apparatus 705 includes a WDM device 720, an OLT 725, an Element Management System (EMS) 730 and an information storage device 735. The WDM device 720 is configured for providing WDM functionality, as discussed above. The OLT provides network-side interfaces and functions as an optical access multi-plexer for performing concentration and grooming of broadband packet traffic between the core network and the subscribers. The EMS 730 includes software that manages sets of OLT's (e.g., via software capable of facilitating at least a portion of the methods, processes and/or operations disclosed herein). The information storage device 735 provides storage space of information instantiations (e.g., database records) corresponding to the each OLT and/or ONT in the BPON system 700.
The subscriber site apparatus 710 includes an ONT 740 connected between one or more network access devices 745 at the subscriber site and the fiber distribution apparatus 715. The ONT 740 is a network interface device that serves information to and/or transmits information from such one or more network access devices 745 at the subscriber site. Computers, telephones, televisions and the like are examples of such network access devices 745. In at least one embodiment of the BPON system 700, the ONT 740 includes software capable of facilitating at least a portion of the methods, processes and/or operations disclosed herein.
The fiber distribution apparatus 715 includes fiber optic cables, splicing enclosures, fiber distribution cabinets/enclosures, drop boxes and the like. An advantageous aspect of the fiber distribution apparatus 715 is that it includes only passive elements. In one embodiment, the fiber distribution apparatus depicts a point-to-multipoint downstream fiber network (i.e., toward the subscriber site apparatus 710) and a multipoint-to-point upstream fiber network (i.e., toward the central office apparatus 705).
A BPON system, such as the BPON system 700 disclosed above, represents one example of a PON system which can implement the methods, processes and/or operations disclosed herein. It is contemplated herein that other current, emerging and yet to be developed PON solutions are also capable of carrying out the methods, processes and/or operations disclosed herein. EPON and GPON systems are examples of such other PON solutions capable of carrying out the methods, processes and/or operations disclosed herein.
When the ONT is powered-up or restarted, the location determiner 22 can, automatically and without manual intervention or assistance, utilize the external interface 25 to obtain the external information, and can then use this external information, automatically and without manual intervention or assistance, to determine the desired location information. The installation controller 21 receives the location information from the location determiner 22, and forwards the location information to the OLT/management entity as described above. In some embodiments, the installation controller 21 can, other than its above-described interaction with the location determiner 22, employ generally conventional techniques to oversee the installation and activation of the ONT.
In some exemplary embodiments, the location determiner 22 is a conventional Global Positioning System (GPS) receiver, the external interface 25 is an associated wireless communication interface for communication of conventional GPS information to and from a component of GPS, and the location information provided from the location determiner 22 to the installation controller 21 includes latitude and longitude coordinates produced by the GPS receiver in response to information received from the GPS component.
Referring again to
It will be apparent to workers in the art that the embodiments of
Although exemplary embodiments of the invention are described above in detail, this does not limit the scope of the invention, which can be practiced in a variety of embodiments.
