CN204761436U - Electric power collection system of two MAC protections of two PON - Google Patents

Abstract

The utility model discloses a power collection device protected by double PON and double MAC. The device comprises: a first optical module, a second optical module, a first PON-MAC chip, a second PON-MAC chip, and a selector circuit; The first optical module is connected to the external first optical line terminal OLT1 through the optical fiber network, and the second optical module is connected to the external second optical line terminal OLT2 through the optical fiber network; the first optical module is also connected through the first PON -The MAC chip is connected to the selector circuit, and the second optical module is also connected to the selector circuit through the second PON-MAC chip; the first PON-MAC chip is also connected to the second PON - the MAC chip is connected; the selector circuit is also connected to the power equipment through an external switch.

Description

A power collection device with double PON and double MAC protection

technical field

The utility model relates to the technical field of electric power optical network communication, in particular to a power collection device protected by double PON and double MAC.

Background technique

EPON (Ethernet Passive Optical Network, Ethernet Passive Optical Network) optical link protection function is a function of great concern in the power field. China Telecom standards define four protection forms: TypeA, TypeB, TypeC and TypeD. In the actual application process of EPON, there is also a protection form of hand in hand.

From a technical point of view, the hand-in-hand protection type is an upgraded version of TypeD. Since the protection ability of the hand-in-hand type is stronger than that of Type D, the hand-in-hand protection is more popular among users. In the existing hand-in-hand protection scheme, telecom EPON is directly applied to power digital substations and distribution network automation projects, usually using two independent ONU (Optical Network Unit, optical network unit) devices to connect to OLT (optical line terminal, optical line terminal), and at the same time The ONU device is connected to the switch, as shown in Figure 1.

Through the research on the above existing hand-held solutions and the consideration of the actual power collection terminal application environment, it is easy to find that the existing technical solutions have the following disadvantages:

(1), unable to meet the demand for precise clock synchronization of the power system.

(2) It is relatively difficult to realize the technology of 50ms redundant switching protection.

(3), GOOSE (GenericObjectOrientedSubstationEvent, Generic Object Oriented Substation Event) message low delay is not easy to achieve.

(4) The power consumption of the overall system solution is high.

(5), two independent ONU devices increase the system cost.

(6), both ONUs need to be connected to a switch, which reduces the port utilization of the switch.

Utility model content

In order to solve the technical problem in the prior art that the abnormality of the optical fiber link easily leads to the failure of the power collection communication system, the utility model proposes a power collection device with double PON and double MAC protection.

The power acquisition device protected by double PON and double MAC of the utility model includes:

A first optical module, a second optical module, a first PON-MAC chip, a second PON-MAC chip, and a selector circuit;

The first optical module is connected to the first external optical line terminal OLT1 through the optical fiber network, and the second optical module is connected to the second external optical line terminal OLT2 through the optical fiber network;

The first optical module is also connected to the selector circuit through the first PON-MAC chip, and the second optical module is also connected to the selector circuit through the second PON-MAC chip;

The first PON-MAC chip is also connected to the second PON-MAC chip; the selector circuit is also connected to electric equipment through an external switch.

In the above technical solution, when the optical link protection form of the optical fiber network is a hand-in-hand protection form, the OLT1 and OLT2 are different OLTs;

When the optical link protection form of the optical fiber network is the TypeD protection form, the OLT1 and OLT2 are the same OLT.

In the above technical solution, the PON-MAC chip is a SGC3001 chip.

In the above technical solution, the selector circuit is a complex programmable logic device CPLD.

In the above technical solution, the PON-MAC chip includes: a UART serial port UART, and the first PON-MAC chip is connected to the PON-MAC chip through the UART;

The first PON-MAC chip and the second PON-MAC chip are respectively connected to the selector circuit through UART.

In the above technical solution, the PON-MAC chip also includes: input and output interface I/O, the first PON-MAC chip and the second PON-MAC chip communicate with the selected connected to the circuit.

In the above technical solution, the PON-MAC chip further includes: a time information interface TOD, and the first PON-MAC chip and the second PON-MAC chip are respectively connected to the selector circuit through the TOD.

In the above technical solution, the PON-MAC chip also includes: Gigabit Media Independent Interface GMII, the first PON-MAC chip and the second PON-MAC chip communicate with the selector circuit respectively through the GMII connected.

In the above technical solution, the PON-MAC chip further includes: a management data input and output interface MDIO, the first PON-MAC chip and the second PON-MAC chip communicate with the selector circuit through the MDIO respectively connected.

In the above technical solution, the selector circuit includes: a management data input and output interface MDIO and a Gigabit Ethernet interface GE, and the selector circuit is connected to an external switch through the MDIO and GE respectively.

Compared with the existing technology, the power acquisition device protected by double PON and double MAC of the utility model has the following technical effects: 1. By using a low power consumption PON-MAC chip, the device has the advantage of low power consumption. 2. Using the ONU chip and CPLD with hardware TOD interface can realize the clock jitter accuracy caused by the failure of a single optical fiber link, which solves the problem that the existing technology cannot meet the precise clock synchronization of the power system. 3. In the prior art, two separate ONU devices are used for hand-in-hand link protection. When a single optical fiber fails, the switching time is long and frame loss is easy. The utility model realizes dual ONU devices on a single PCB board, shares network data cache at the same time, has fast switching time, and does not lose frames. Moreover, only one switch interface is used, and the system cost is low. 4. The existing technical solution requires the network management and OLT to configure two ONU devices at the same time. The utility model only needs to configure the main ONU device, and the main ONU device will synchronize the configuration information to the backup ONU device, which reduces the management complexity of the network management and OLT .

Other features and advantages of the present invention will be set forth in the following description, and, in part, will be apparent from the description, or can be learned by practicing the present invention. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

The technical solutions of the present utility model will be further described in detail through the drawings and embodiments below.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, and are used to explain the utility model together with the embodiments of the utility model, and do not constitute a limitation to the utility model. In the attached picture:

Fig. 1 is the connection schematic diagram of ONU and OLT in the prior art;

Fig. 2 is the structural schematic diagram of the power acquisition device of double PON double MAC protection of the utility model embodiment;

Fig. 3 is the query of the utility model embodiment and configures the schematic diagram of main standby PON port;

FIG. 4 is a schematic diagram of a hand-in-hand optical network protection topology according to an embodiment of the present invention;

Fig. 5 is the configuration and synchronous schematic diagram of the ONU main backup PON mouth of the utility model embodiment;

Fig. 6 is a schematic diagram of monitoring a fiber link fault according to an embodiment of the present invention.

Detailed ways

The specific embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present utility model is not limited by the specific embodiments.

In order to solve the technical problem in the prior art that the abnormality of the optical fiber link easily leads to the failure of the power collection communication system, the utility model proposes a power collection device with double PON and double MAC protection. The power collection device protected by double PON and double MAC is actually an Optical Network Unit (ONU), which is installed in a power collection terminal.

As shown in Figure 2, the power collection device protected by double PON and double MAC of the present invention includes: a first optical module (optical module 1), a second optical module (optical module 2), a first PON-MAC chip, a second optical module Two PON-MAC chips and a selector circuit; the first optical module is connected to the first external optical line terminal OLT1 through the optical fiber network, and the second optical module is connected to the second external optical line terminal OLT2 through the optical fiber network; The first optical module is also connected to the selector circuit through the first PON-MAC chip, and the second optical module is also connected to the selector circuit through the second PON-MAC chip; the first optical module is also connected to the selector circuit through the second PON-MAC chip; The PON-MAC chip is also connected to the second PON-MAC chip; the selector circuit is also connected to the power equipment through an external switch. PON refers to Passive Optical Network, passive optical network, MAC refers to MediaAccessControl, media access control; PON-MAC chip is a MAC chip based on the media access control protocol of passive optical network.

When the optical link protection form of the optical fiber network is the hand-in-hand protection form, the OLT1 and OLT2 are different OLTs; when the optical link protection form of the optical fiber network is the TypeD protection form, the OLT1 and OLT2 are the same OLT .

Preferably, the selector circuit of the present utility model is a complex programmable logic device CPLD (ComplexProgrammableLogicDevice), and those skilled in the art should understand that other selector circuits that can realize functions such as main and standby PON port selection should also be included in the requirements of the present utility model. within the scope of protection.

Preferably, the PON-MAC chip in the present invention adopts SGC3001 chip. The SGC3001 chip includes SGC3001(1) and SGC3001(2), which contain multiple serial ports or interfaces, such as: UART (Universal Asynchronous Receiver/Transmitter), input and output interface I/O (ie, in Figure 2 int interface), time information interface TOD (TimeOfDate), Gigabit Media Independent Interface GMII (Gigabit Medium Independent Interface), management data input and output interface MDIO (ManagementDataInput/Output), etc. The two SGC3001 chips are connected to the CPLD through the above-mentioned various serial ports, interfaces or network ports.

The CPLD also includes a variety of interfaces or serial ports, such as MDIO and Gigabit Ethernet interface GE (GigabitEthernet). The CPLD is connected to an external switch through MDIO and GE, thereby connecting multiple power devices through the external switch.

The working process of the power acquisition device protected by double PON and double MAC of the present utility model comprises the following steps:

Step 1 , device power-on initialization: After the ONU is powered on, the entire system will perform an overall reset. After reset, the two PON-MAC chips determine the active and standby states according to the PON_IF_ID signal sent by the CPLD, that is, the active PON port and the standby PON port. For example, it can be set that when PON_IF_ID=0, the PON-MAC chip corresponding to this PON_IF_ID is in the active state, and the corresponding PON port is the active PON port; when PON_IF_ID=1, the corresponding PON port is the standby PON port. Wherein, the PON port includes: a PON-MAC chip and a correspondingly connected optical module.

Step 2 , device registration and discovery: MPCP registration and discovery follow IEEE802.3ah protocol; OAM discovery process follows IEEE802.3ah protocol and CTC3.0 enterprise standard. MPCP (Multi-PointControlProtocol, multi-point control protocol) is a protocol of the EPONMAC control sublayer. MPCP defines the control mechanism between OLT and ONU to coordinate the effective sending and receiving of data. OAM, Operation Administration and Maintenance. According to the actual needs of the operator's network operation, the network management work is usually divided into three categories: operation (Operation), management (Administration), maintenance (Maintenance), referred to as OAM. Operation mainly completes the analysis, prediction, planning and configuration of the daily network and services; maintenance mainly refers to the daily operation activities such as testing and fault management of the network and its services.

Step 3 , the query and setting of the main and standby PON ports of the device: After the device registration and discovery in step 2 are completed, since the main PON and the backup PON have been determined in step 1, the OLT connected to the main PON port can pass Send OAM frames to the power acquisition unit (ONU) to query and obtain the status and information of the two PON-MAC chips in the ONU. Moreover, the OLT can change the main PON port of the ONU device through OAM settings, and the transmission channel used at this time is a backup channel.

The query and configuration process is shown in Figure 3. Query process: OLT sends an ActivePON_IFRequest (get) command to ONU, requesting to obtain the status and information of the two PON-MAC chips in the ONU, and the ONU replies to the OLT with the ActivePON_IFResponse command, which carries the status and information of the two PON-MAC chips (including the optical power of the optical module, the registration information of the SGC3001 chip, etc.). Configuration process: OLT sends ActivePON_IFRequest (set) command to ONU, requesting to switch between active PON port and standby PON port, ONU replies ActivePON_IFResponse command to OLT, and performs active and standby PON switching, and the switching is completed.

After the query and configuration process is completed, take the EPON optical network of the hand-in-hand protection type as an example, and its protection topology information is shown in Figure 4.

When the active and standby PON ports of ONU1 are switched, the network management can form the service protection link information as shown in Table 1:

Table 1

After the switchover of the active and standby PON ports is completed, all service attribute configurations are completed through the active PON port, and the ONU device completes the service consistency synchronization of the active and standby PON ports. The configuration and synchronization process is shown in Figure 5. The OLT sends the VlanSet command (Vlan, VirtualLocalAreaNetwork, virtual local area network) to the ONU through the main PON port. After the ONU configuration is completed, the OLT replies to the OLT. The service attribute configuration information is synchronized to the standby PON port.

Step 4 , optical fiber link failover: both OLT and ONU will monitor the status of the optical link. When it is found that the optical signal is lost or the signal is degraded, the optical path switching is started. Assume that the working topology diagram during the initial work is shown in Figure 6. In the figure, the main PON ports of ONU1 and ONU2 are connected to the No. 0 PON port of OLT-ID7; in Figure 6, PONID is the code to distinguish different PON ports on the OLT. PONIFID is the code to distinguish the main PON port and the standby PON port of the ONU.

In the topology shown in Figure 6, two ONUs are used, namely ONU1 and ONU2. Among them, the main PON ports of ONU1 and ONU2 are connected to PON No. 0 with OLTID=7, and the standby PON ports of ONU1 and ONU2 They are all connected to PON No. 1 with OLTID=8.

(1) When a link failure occurs at position 1 in Figure 6, that is, the backbone fiber (the fiber between the OLT and the optical splitter): ① If the OLT-ID7 detects that the backbone optical path is abnormal, it will report an alarm event to the network management, and at the same time Turn off the sending function of the optical module of PON port 0 (including the optical module of the main PON on ONU1 and ONU2); ②When ONU1 and ONU2 detect that the optical path is abnormal, they switch their respective standby PON ports Report an optical link switching event.

(2) When there is a link failure at position 2 in Figure 6, that is, the split fiber (the fiber between the ONU and the splitter): ① If the OLT-ID7 detects that the optical path of ONU1 is abnormal, it will report an alarm event to the network management; ② When ONU1 detects that the optical path is abnormal, it will switch its standby PON port to the active PON port and report the optical link switching event.

Compared with the existing technology, the electric power collection device (ONU) protected by double PON and double MAC of the present utility model has the following technical effects: 1. By using a low power consumption PON-MAC chip, it has the advantage of low power consumption of the equipment. 2. Using the ONU chip and CPLD with hardware TOD interface can realize the clock jitter accuracy caused by the failure of a single optical fiber link, and solve the problem that the existing technology cannot meet the precise clock synchronization of the power system. 3. In the prior art, two separate ONU devices are used for hand-in-hand link protection. When a single optical fiber fails, the switching time is long and frame loss is easy. The utility model realizes dual ONU devices on a single PCB board, shares network data cache at the same time, has fast switching time, and does not lose frames. Moreover, only one switch interface is used, and the system cost is low. 4. The existing technical solution requires the network management and OLT to configure two ONU devices at the same time. The utility model only needs to configure the main ONU device, and the main ONU device will synchronize the configuration information to the backup ONU device, which reduces the management complexity of the network management and OLT .

The above disclosures are only a few specific embodiments of the utility model, but the utility model is not limited thereto, and any changes conceivable by those skilled in the art should fall within the protection scope of the utility model.

Claims (10)

1. A power acquisition device protected by double PON and double MAC, characterized in that it comprises: A first optical module, a second optical module, a first PON-MAC chip, a second PON-MAC chip, and a selector circuit; The first optical module is connected to the first external optical line terminal OLT1 through the optical fiber network, and the second optical module is connected to the second external optical line terminal OLT2 through the optical fiber network; The first optical module is also connected to the selector circuit through the first PON-MAC chip, and the second optical module is also connected to the selector circuit through the second PON-MAC chip; The first PON-MAC chip is also connected to the second PON-MAC chip; the selector circuit is also connected to electric equipment through an external switch. 2. The power collection device with double PON and double MAC protection according to claim 1, wherein when the optical link protection form of the optical fiber network is a hand-in-hand protection form, the OLT1 and OLT2 are different OLTs; When the optical link protection form of the optical fiber network is the TypeD protection form, the OLT1 and OLT2 are the same OLT. 3. The power acquisition device protected by dual PON and dual MAC according to claim 1, wherein the PON-MAC chip is a SGC3001 chip. 4. The power acquisition device protected by dual PON and dual MAC according to claim 1, wherein the selector circuit is a complex programmable logic device (CPLD). 5. The power acquisition device protected by dual PON and dual MAC according to any one of claims 1-4, wherein the PON-MAC chip comprises: a universal asynchronous transceiver serial port UART, and the first PON- The MAC chip is connected to the PON-MAC chip through the UART; The first PON-MAC chip and the second PON-MAC chip are respectively connected to the selector circuit through UART. 6. The power acquisition device protected by dual PON and dual MAC according to any one of claims 1-4, wherein the PON-MAC chip further comprises: an input/output interface I/O, and the first PON- The MAC chip and the second PON-MAC chip are respectively connected to the selector circuit through the I/O. 7. according to the power collection device of double PON double MAC protection described in any one of claim 1-4, it is characterized in that, described PON-MAC chip also comprises: time information interface TOD, described first PON-MAC chip , the second PON-MAC chip is respectively connected to the selector circuit through the TOD. 8. The power acquisition device protected by dual PON and dual MAC according to any one of claims 1-4, wherein the PON-MAC chip also includes: Gigabit Media Independent Interface GMII, the first PON- The MAC chip and the second PON-MAC chip are respectively connected to the selector circuit through the GMII. 9. The power acquisition device protected by dual PON and dual MAC according to any one of claims 1-4, wherein the PON-MAC chip further comprises: management data input and output interface MDIO, the first PON- The MAC chip and the second PON-MAC chip are respectively connected to the selector circuit through the MDIO. 10. according to the power collection device of double PON double MAC protection described in any one of claim 1-4, it is characterized in that, described selector circuit comprises: management data input and output interface MDIO, Gigabit Ethernet interface GE, so The selector circuit is respectively connected to an external switch through the MDIO and GE.