MXPA98006254A - Network terminator for band networks an - Google Patents

Abstract

The network terminator for broadband networks consists of a single-mode access electro-optic converter, with access JDS Terminator, a Synchronization Module, a single-mode or multimode user electro-optical converter, a user JDS Terminator and a Process module, also having a connection interface with the operator's network, a connection interface with the user network and an interface for connection to an external PC, the equipment, in addition to the optical regeneration and the single-mode conversion multimode allows the realization of real-time test and monitoring loops of the quality of service in the physical layer, allowing to delimit the responsibilities in both areas of responsibility, user and operator.

Description

NETWORK TERMINATOR FOR BROADBAND NETWORKS OBJECT OF THE INVENTION The present invention relates to an electronic equipment that acts as an optical line terminator in the access network of the B-ISDN (Integrated Services-Broadband Digital Network). Performs the electro-optical conversion, both mono or multimode, synchronization of the user network with the operator's network, generates and detects physical layer alarms of the JDS and calculates the quality of the transmission on the connection interfaces with the network of the operator and with the user network offering, in addition, the possibility of connecting a PC (personal computer) to perform the local management of the equipment, in order to manage and monitor the alarms, monitor the performance of the transmission, perform ties for testing and updating the software, an option that allows the team to evolve by adding the new features demanded by the market.

FIELD OF THE INVENTION This invention has its application within the field of telecommunications, specifically at the border points of broadband optical access networks based on the JDS (Synchronous Digital Hierarchy) with frame structure STM-1 (Synchronous Transmission Module Type 1) .

BACKGROUND OF THE INVENTION It is known the existence in the market of commercial equipment that realize the optical regeneration and the single mode-multimode conversion but it is not known, by the applicant, any equipment that, in addition to these functions, allows the realization of loops and the monitoring, in real time, the quality of service in the physical layer. This allows us to delimit the responsibilities of the user and the operator, by performing transmission quality tests in both areas of responsibility independently, being the maintenance and troubleshooting or the incorrect operations easier to perform.

BRIEF DESCRIPTION OF THE INVENTION The network terminator for broadband networks, object of this invention, is constituted, basically, by the following blocks: 1.- Access single-mode electro-optical converter 2) .- Access JDS terminator. 3) .- Synchronism module. 1) .- Single-mode or multimode user electro-optical converter. 5) .- User JDS terminator. 6) .- Process module. The single-mode access electro-optic converter contains the connection interface with the operator's network (Integrated Services Digital Network). In transmission it performs the conversion of the electrical signal, delivered by the access JDS Terminator, into an optical signal to be transmitted through a single-mode optical fiber connected to it. At reception, it converts the optical signal from the optical fiber connected to the interface to the operator's network, into an electrical signal suitable for the access JDS Terminator. Extracting, in addition, the information of the bit rate at which the information is being received by the optical fiber, to be used by the Synchronism Module. In the single-mode access electro-optical converter, the exclusive loop for the operator is made, when requested, a loop that returns the data received by the connection interface with the operator's network before they reach the access JDS Terminator.

The Access JDS Terminator performs, in transmission, the assembly of the VC-4 (virtual container of level 4) from the user interface within the structure STM-1 of the JDS. In the assembly of the VC-4 the adaptation of the transmission frequencies in the physical and reception means of the VC-4 container is carried out, when the Synchronization module is configured in local mode. In reception, it extracts the VC-4 from the frame structure to be introduced in the other interface. It also processes the section overhead of the STM-1 frame structure detecting the alarms and calculating the regeneration and multiplexing section errors, generating the alarms and the corresponding specific information. Likewise, it is made, when it is requested, the loop included for the operator, a loop that returns the data received by the connection interface with the operator's network. The Synchronism Module is responsible for synchronizing the user's private network with the operator's network. The synchronization is carried out by means of a phase-locked loop, PLL (Phase Lock Loop) circuit, which generates the binary transmission speed for the connection interfaces with both networks. This speed is automatically selected from the binary information signal extracted from the connection interface with the operator's network or from a signal from a local oscillator located within the synchronization module itself. The single-mode or multi-mode user electro-optical converter contains the connection interface with the private network of a user of the B-ISDN. In transmission it performs the conversion of the electrical signal, delivered by the user JDS Terminator, into an optical signal to be transmitted through a single-mode or multimode optical fiber connected to it. In reception, it converts the optical signal coming from the single-mode or multimode optical fiber connected to the interface with the user network, into an electrical signal suitable for the user's JDS Terminator. Likewise, the exclusionary link for the user is made, when requested, which allows the data received by the user interface to be returned by the user. The user JDS Terminator performs, in transmission, the assembly of the VC-4 from the connection interface with the operator's network within the STM-1 structure of the JDS.

In the assembly of the VC-4 the adaptation of the transmission frequencies in the physical and reception environment of the container VC-4 is carried out, when the synchronism module is configured in local mode. In reception, it extracts the VC-4 from the frame structure to be introduced in the other interface. It also processes the section overhead of the frame structure STM-1, detecting the alarms and calculating the regeneration and multiplexing section errors, generating the alarms and the corresponding specific information. The Process Module is in charge of controlling all the equipment and of carrying out the quality measurements in the connection interfaces, both to the operator's network and to the user's network. It provides a RS-232 serial interface to connect a PC from which the equipment can be maintained. Each time the Type 1 network terminator for broadband networks is rebooted, object of this invention, the Process module configures each one of the blocks that compose it and begins to perform the management functions, whether they are for alarms, the Synchronism status or transmission quality in physical layer, also incorporates the functionality of making loops through switches or through the RS-232 serial interface of local management.

DESCRIPTION OF THE DRAWINGS To complete the description and in order to help a better understanding of the invention, the accompanying descriptive report, as an integral part thereof, is accompanied by a sheet of drawings in which, with an illustrative and non-limiting character, a block diagram of the network terminator for broadband networks, object of this invention, in which the connections and fundamental blocks of the circuit have been indicated.

PREFERRED EMBODIMENT OF THE INVENTION The Network Terminator for Broadband Networks, object of this invention, performs electro-optical conversions, both single mode and multimode, according to recommendation G.957 of the ITU (International Telecommunication Union), termination of regeneration section and multiplexing in the SDS according to ITU recommendations G.707, G.708, G.709 and G.783, as well as ITU recommendation G.70X for the synchronization of the user network with the network of access. In view of Fig-1 it can be seen that the Network terminator for broadband networks, object of this invention, is constituted, basically, by the following blocks: 1) .- Single-mode access electro-optical converter (1). 2) .- Access JDS terminator (4). 3) .- Synchronism module (2). 4) .- Single-mode or multimode user electro-optical converter (3). 5) .- User JDS terminator (5). 6) .- Process module (6). The access single-mode electro-optical converter (1) contains the interface (7) for connection to the operator's network (Integrated Services Digital Network). In transmission, it performs the conversion of the electrical signal delivered by the access JDS Terminator (4), through the connection (12), into an optical signal to be transmitted through a single-mode optical fiber, inside the second window ( 1330 nm wavelength), connected to the interface (7) for connection to the operator's network. In reception, it converts the optical signal from the optical fiber connected to the interface (7) to connect to the operator's network, in a suitable electrical signal that, through the connection (12), will be delivered to the access JDS Terminator ( 4) . Extracting, in addition, the information of the bit rate at which the information is being received by the optical fiber that will be delivered, through the connection (15), to the Synchronism Module (2) for its use by the same. In the single-mode access electro-optical converter, when it is requested, the exclusive loop for the operator is made, a loop that returns the data received by the interface (7) to the operator's network before they reach the JDS terminator. of access (4) . The access JDS Terminator (4) performs, in transmission, the assembly of the VC-4 from the user interface (8) within the structure STM-1 of the JDS. Information that is provided by the user JDS Terminator (5) through the connection (11) • In the assembly of the VC-4, the transmission frequencies are adapted to the physical and reception means of the VC container. 4, when the Synchronization Module (2) is configured in local mode. This is achieved by performing frequency justifications (absorption and adaptation of frequency deviations existing in the data transport) by processing or handling the pointer of the AU-4 (administrative unit of level 4), according to the recommendations G.709 and G .793 of the ITU. In reception, the Access Terminator (4) extracts the VC-4 from the frame structure to be introduced in the other interface, information that will be supplied to the user JDS Terminator (5) through the connection (11). It also processes the section overhead of the frame structure STM-1, detecting the alarms and calculating the regeneration section errors (Fl flows) and multiplexing (F2 flows), generating the alarms and the corresponding specific information that, through the connection (10), will be supplied to the Process Module (6). Likewise, it is made, when requested, the link included for the operator, a loop that returns the data received by the interface (7) connected to the operator's network. The Synchronization Module (2) is responsible for synchronizing the user's private network with the operator's network. The synchronization is carried out by means of a phase-locked loop, - PLL circuit (Phase Look Loop) -, which generates the binary transmission speed for both interfaces. This speed is automatically selected from the binary information signal extracted from the interface (7) for connection to the operator's network or from a signal from a local oscillator located inside the synchronization module (2) itself. The Synchronization Module (2) informs, through the connection (14), to the monomode access electro-optical converter (1), to the access JDS Terminator (4), to the Single-mode or multi-mode user electro-optical converter (3) and the user JDS Terminator (5) of the bit rate to which they must transmit. The single-mode or multimode user electro-optical converter (3) contains the connection interface (8) with the private network of a user of the ISDN-BA (Network Digital Broadband Integrated Services). In transmission it performs the conversion of the electrical signal delivered by the user JDS Terminator (5), through the connection (13), into an optical signal to be transmitted through a single-mode or multimode optical fiber connected to the interface (8). ) connection to the user network. In reception, it converts the optical signal from the single-mode or multimode optical fiber connected to the interface (8) connecting to the user network, into an electrical signal suitable to be delivered, through the connection (13), to the JDS Terminator of user (5). Also, it is performed, when requested, the exclusive link for the user, a link that allows the data received by the interface (8) to connect to the user network are returned by it.

The user JDS Terminator (5) performs, in transmission, the assembly of the VC-4 from the interface (7) connecting to the operator's network within the STM-1 structure of the JDS. Information that is supplied by the user JDS Terminator (4) through the connection (11). In the assembly of the VC-4 the adaptation of the transmission frequencies in the physical and reception means of the container VC-4 is carried out, when the synchronism module (2) is configured in local mode.

This is achieved by performing frequency justifications (absorption and adaptation of frequency deviations existing in the transport of data) by processing or handling the pointer of the AU-4, according to the recommendations G.709 and G.793 of the ITU. In reception, the user JDS Terminator (5) extracts the VC-4 from the frame structure so, through the connection (11), it is delivered to the access JDS Terminator (4). It also processes the section overhead of the frame structure STM-1, detecting the alarms and calculating the regeneration section errors (flows Fl) and multiplexing (flows F2), generating the corresponding specific information and alarms. The Process Module (6) is in charge of controlling all the equipment and performing the quality measurements in the connection interfaces, both with the operator's network and with the user's. It provides an RS-232 serial interface (9) to connect a PC or local management terminal from which the equipment can be maintained. Each time the Network Terminator for broadband networks is restarted, object of this invention, the Process Module (6) configures each one of the blocks that compose it and begins to perform the management functions, whether they are alarms, synchronism or transmission quality in physical layer, also incorporates the functionality of making loops through switches or through the RS-232 serial interface (9) local management, to perform continuity tests on both interfaces by performing of loops. The exchange of signals, whether of configuration, control or information, between the Process Module (6), the access JDS terminators (4) and the user (5) and the Synchronism Module (2), are made to through the connection (10). The management functions performed by the Process module (6) are: 1) .- Alarm management. 2) .- Synchronism state management. 3) .- Management of transmission quality. For the management of alarms the state of the alarms is monitored every second, both of the interface (8) for connection to the user network and of the interface (7) for connection to the operator's network, so that they can be presented at the local management terminal (16) connected to the RS-interface. 232 (9) and the operator can determine the causes of malfunction. The alarms that are generated are: LOS (Loss of signal): Loss of the optical signal received at the optical interface. It occurs when there is no optical fiber connected to the interface or when the remote end is connected it does not transmit an adequate optical signal. LOF (Loss of frame): Loss of the JDS frame.

It occurs when the JDS Terminator, both user (5) and access (4), is not able to find the JDS frame alignment for three consecutive frames. LOP (Loss of pointer): Loss of the pointer of the AU-4. It occurs when the JDS Terminator, both user (5) and access (4), is not able to find a coherent pointer. MSAIS (Multiplex section alarm signal indicator): Alarm in the multiplex section of the JDS frame. MSRDI (Multiplex section remote defect indicator): Fault alarm at the remote end. It is generated in the JDS Terminators (4) and (5) when they are in a multiplex section alarm situation. EBER (Excessive bit error rate): Excessive error rate. It occurs when the received error rate exceeds the threshold 10 ~ 4. This alarm can be enabled or inhibited by the Local Management Terminal (16) connected to the RS-232 interface (9). The management of the synchronization state determines, by means of the information provided by the access JDS Terminator (4) through the connection (10), the synchronism state of the Terminator for Broadband Networks object of this invention. For this, once per second the content of the octet Zl (synchronization state) of the JDS frame of the interface (7) for connection to the operator's network is obtained, compared with the previous one and when they are different, the status of the synchronism to the situation indicated in the last octet Zl received. The interpretation of these octets (bits 5 to 8) is as follows: Binary value "0000": Unknown quality.

When this situation is detected, the local oscillator located in the Synchronization Module (2) is used as the source of the transmission bit rate of the Network Terminator object of this invention, which will be communicated to the Synchronization Module (2) through the connection (10).

Binary value "1111": Do not use for synchronization. It acts the same as in the previous case. Other binary values: The Network Terminator object of this invention will use, as a source of the transmission bit rate, the one extracted from the interface (7) for connection to the operator's network, which will be communicated to the Synchronization Module (2) to through the connection (10). When the Network Terminator object of this invention happens to local synchronization, informs the user network of this situation forcing the binary value of bits 5 to 8 of octet Zl of the outgoing frame to the user interface (8) have the binary value "1111". In case of switching to remote synchronization, this value will be that received in octet Zl of the incoming frame by the interface (7) for connection to the operator's network. For the management of transmission quality, the quality parameters defined in ITU Recommendation G.826 are calculated and accumulated, based on the information of extracted parity violations, through the connection (10) of the Terminators. JDS network (4) and (5).

These parity violations are extracted from the B2 bytes (parity of the frame calculated at source) for reception and octet Z2 (notification of parity violations at the remote end) for transmission, according to ITU recommendation G.709 for the section overhead of the STM-1 frames. This information is interpreted, by the Terminator for Broadband Networks, as follows: If the number of parity violations supposes an error rate higher than 10-4, the number of seconds with errors and the number of seconds with severe errors. If the number of parity violations involves an error rate of less than 10-4, the number of seconds with errors increases. If the number of parity violations is null, none of them increases. The number of parity violations accumulates during a time interval defined by the local management terminal (16) connected to the RS-232 serial interface (9) of the Process Module (6). These times are: 1 second, 10 seconds, 1 minute, 10 minutes, 15 minutes, 1 hour, 2 hours and 1 day. In this way you can know the average error rate per bit with different time resolutions.

Claims (1)

NOVELTY OF THE INVENTION CLAIMS

1. - Network terminator for broadband networks, characterized in that it consists of a single-mode access electro-optical converter (1), an access JDS Terminator (4), a synchronization module (2), a single-mode electro-optical converter or user multimode (3), a user JDS Terminator (5) and a Process Module (6), also having an interface (7) for connecting to the operator's network, an interface (8) for connecting to the user network and an interface (9) for connection to a PC or local management terminal (16), and also counting the connection (10) for the exchange of signals between the Process module (6), the synchronism module (2) and the JDS Terminators (4) and (5), of the connection (11) for the exchange of signals between the JDS Terminators (4) and (5), of the connection (12) for the exchange of signals between the electro-optical converter (1) and the JDS Terminator (4), of the connection (13) for the exchange of signals between the electro-optical converter (3) and the JDS Terminator (5), of the connection (14) for sending signals from the Synchronization module (2) to the electro-optical converters (1) and (3) as well as the JDS Terminators (4) and (5) and the connection (15) for sending signals from the Electro-Optical Converter single mode (1) to the synchronism module (2). 2.- Network terminator for broadband networks, according to claim 1, characterized in that the Process Module (6) configures each of the blocks that make up the Network Terminator for broadband networks, and performs the relative management functions to alarms, synchronism status and transmission quality in the physical layer, allowing the monitoring of transmission quality features in real time. 3. - Network terminator for broadband networks, according to claim 1, wherein the process module (6) incorporates the function of making loops, to perform continuity tests on both interfaces by making loops. 4.- Network terminator for broadband networks, according to claim 1, characterized in that the Process Module (6), by means of the information provided by the JDS Terminators of access (4) and user (5), detects the alarms and calculates the errors of the flows Fl (regeneration section) and F2 (multiplexing section) of the JDS frames. 5. Network terminator for broadband networks, according to claim 1, characterized in that the JDS Terminators (4) and (5) absorb and adapt the frequency deviations existing in the data transport, included in the frame structures, between the interfaces (7) and (8), through the management of the pointer of the administrative units of level 4 (AU-4). 6.- Network terminator for broadband networks, according to claim 1, characterized in that by the electro-optical converters (1) and (3), which convert the electrical signals into optical signals and vice versa, and the JDS Terminators (4) and (5), which perform the specific functions of the physical layer, the function of optical regeneration and adaptation of optical networks is carried out monomode to multimode and vice versa.