JP7447059B2 - Network equipment and network systems - Google Patents

Description

The present invention relates to a network device and a network system.

Patent Document 1 discloses a method of notifying power-off of a media converter without using a frame. Specifically, the media converter repeatedly transmits a predetermined bit string to the other party's device when a power outage occurs.

Japanese Patent Application Publication No. 2003-298609

For example, in a data communication network system including base stations and accommodation stations, natural disasters such as typhoons may cause severe damage to network devices within the base stations. In particular, damage such as power outages and line failures often occur, and power outages may continue for several days or more. Here, for example, when a power outage occurs in a network device within a base station, the network device can use various methods to notify the network device within the host station that a power outage has occurred. Based on the notification, the network device in the accommodation station can understand that a power outage has occurred in the network device in the base station.

However, for example, after a power outage is notified, a line, specifically an optical fiber, may be disconnected due to wind damage or a natural disaster such as a fallen tree. If an optical fiber break occurs in such a situation, it is difficult for the network equipment in the host station to grasp the status of the optical fiber, including whether the optical fiber is broken, because the network equipment in the base station is in a power outage state. It can be. As a result, failure recovery may take time.

SUMMARY OF THE INVENTION Accordingly, one of the objects of the present invention is to provide a network device and a network system that can grasp the status of a line even in a power outage state.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

A brief overview of typical embodiments of the invention disclosed in this application is as follows.

A network device according to one embodiment has a plurality of ports to which optical transceivers are attached, an emergency circuit including a first load switch and a controller, and a battery that generates a backup power source. The first load switch supplies backup power from a battery to the plurality of ports and the controller in the event of a power outage. After a power outage occurs, the controller activates each of the plurality of ports for a predetermined active period that does not overlap with each other, and controls the activated ports to transmit maintenance signals.

Of the inventions disclosed in this application, the effects obtained by the typical embodiments will be briefly described. It becomes possible to grasp the line status even in a power outage state.

1 is a schematic diagram showing a configuration example of a network system according to an embodiment. 2 is a schematic diagram showing a configuration example of an optical transceiver in FIG. 1. FIG. In FIG. 1, it is a schematic diagram showing an example of the configuration of a main part related to the present invention of a network device in a lower level network. 4 is a timing chart showing a schematic operation example of the controller in FIG. 3. FIG. FIG. 2 is a sequence diagram showing an example of the operation of main parts related to the present invention in the network system of FIG. 1; 4 is a diagram showing a detailed configuration example around the DCDC converter in FIG. 3. FIG. 7 is a diagram showing a detailed configuration example different from FIG. 6 around the DCDC converter in FIG. 3. FIG.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In addition, in all the figures for explaining the embodiment, the same members are given the same reference numerals in principle, and repeated explanations thereof will be omitted.

<Overview of network system>
FIG. 1 is a schematic diagram showing a configuration example of a network system according to an embodiment. The network system shown in FIG. 1 includes, for example, an upper network 10 that is an accommodation station of a data communication network, and a lower network 20 that is a base station or the like. A network device 11 is accommodated in the upper network 10 . A network device 21 is accommodated in the lower network 20 .

The network device 11 in the upper network 10 and the network device 21 in the lower network 20 are, for example, a layer 2 (L2) switch device, a layer 3 (L3) switch device, or the like. The network device 11 and the network device 21 are connected via a plurality of lines, specifically, optical fibers 15[1] to 15[n]. In the specification, the plurality of optical fibers 15[1] to 15[n] are collectively referred to as optical fibers 15.

The network device 21 in the lower network 20 includes a plurality of ports P for optical communication, typified by, for example, an SFP (Small Form Factor Pluggable) port, an SFP+ port, and the like. Optical transceivers TR are attached to the plurality of ports P as appropriate. The optical transceiver TR includes an optical connector CNo connected to the optical fiber 15 and an electrical connector (not shown) connected to the port P. The optical connector CNo is, for example, an LC connector.

The network device 11 in the upper network 10 also has the same configuration as the network device 21 in the lower network 20, for example. Thereby, the plurality of ports P of the network device 11 and the plurality of ports P of the network device 21 can perform optical communication via the optical transceiver TR and the optical fibers 15[1] to 15[n]. Note that the upper network 10 may include a plurality of network devices 11, and the lower network 20 may also include a plurality of network devices 21.

Here, in FIG. 1, for example, a power outage occurs in the network device 21 in the lower network 20 due to a natural disaster, etc., and then a disconnection occurs in any of the optical fibers 15[1] to 15[n]. Assume a case. In this case, the network device 21 can transmit a maintenance frame or the like representing a power outage notification from one or more ports P, for example, using the remaining power immediately after the power outage. Then, the network device 11 in the upper network 10 can grasp the occurrence of a power outage in the network device 21 based on this maintenance frame and the like.

However, when the network device 21 in the lower network 20 is out of power, the network device 11 in the upper network 10 usually recognizes the subsequent disconnection of the optical fibers 15[1] to 15[n]. This can be difficult. In this case, for example, the disconnection of the optical fibers 15[1] to 15[n] may be discovered after the power outage is resolved, so there is a risk that it will take time to recover from the failure. Therefore, it is advantageous to use the method of the embodiment described later.

<Details of optical transceiver>
FIG. 2 is a schematic diagram showing a configuration example of the optical transceiver in FIG. 1. The optical transceiver TR shown in FIG. 2 includes an electrical connector CNe for processing electrical signals, an analog front end (AFE) circuit 42, an optical subassembly (OSA) 43 for processing optical signals, an optical connector CNo, and a controller. 44. As described in FIG. 1, the optical connector CNo is an LC connector or the like connected to the optical fiber 15.

Further, as described in FIG. 1, the electrical connector CNe is connected to the port P of the network devices 11, 21, for example, the SFP+ port. Electrical connector CNe includes a power supply terminal for power supply Vcc. The voltage value of the power supply Vcc is, for example, 3.3V. Optical transceiver TR operates using power supply Vcc supplied from this electrical connector CNe.

The controller 44 is responsible for controlling the entire optical transceiver TR. The optical subassembly (OSA) 43 includes a laser diode LD and a photodiode PD. The laser diode LD converts the electrical signal from the electrical connector CNe side into an optical signal and transmits it to the outside via the optical connector CNo. The photodiode PD converts an optical signal received from the outside via the optical connector CNo into an electrical signal, and transmits it to the electrical connector CNe side.

Analog front end (AFE) circuit 42 includes a driver 50 and a preamplifier/postamplifier 51. The driver 50 converts an electrical signal from the electrical connector CNe, in other words a modulation signal, into a modulation current that can drive the laser diode LD. Preamplifier/postamplifier 51 amplifies the electrical signal from photodiode PD and transmits it to electrical connector CNe.

In FIG. 2, a driver 50 and a preamplifier/postamplifier 51 of an analog front end (AFE) circuit 42 are composed of an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or the like. The controller 44 is composed of a microcontroller including a processor, an ASIC, an FPGA, or the like.

<Network device details>
FIG. 3 is a schematic diagram showing a configuration example of a main part related to the present invention of a network device in a lower network in FIG. 1. FIG. 4 is a timing chart showing a schematic example of the operation of the controller in FIG. The network device 21 shown in FIG. 3 includes a plurality of ports P[1] to P[n] such as SFP+ ports, a physical layer (PHY layer) processing circuit 25, a power outage detection circuit 26, and an emergency A circuit 27 is provided. Optical transceivers TR as shown in FIG. 2 are attached to the plurality of ports P[1] to P[n].

In this example, the physical layer processing circuit 25 is a processing circuit for transmission. The physical layer processing circuit 25 performs various processes required at the physical layer (PHY layer) on a MAC (Medium Access Control) frame to be transmitted. Examples of the processing required in the physical layer include encoding, SerDes (parallel/serial conversion), and the like. The physical layer processing circuit 25 is configured by, for example, FPGA, ASIC, or the like.

After performing the processing required on the physical layer, the physical layer processing circuit 25 transmits the electrical signal ES of the MAC frame toward port P[1] when transmitting the MAC frame from port P[1]. Send [1]. Similarly, when transmitting a MAC frame from port P[n], the physical layer processing circuit 25 transmits the electrical signal ES[n] of the MAC frame toward port P[n]. The electrical signals ES[1] to ES[n] are converted into optical signals by the optical transceiver TR shown in FIG. sent to.

Although not shown, the network device 21 specifically performs processing required in the physical layer, such as decoding and serial/parallel conversion, on the electrical signal of the MAC frame received at port P. It also includes a physical layer processing circuit for reception. Furthermore, the network device 21 also includes various processing circuits responsible for processing in layers higher than the physical layer, depending on the type. For example, if the network device 21 is an L2 switch device, a MAC layer processing circuit or the like that performs MAC frame relay processing, generation processing, etc. is provided before the physical layer processing circuit 25.

The power outage detection circuit 26 monitors the main power supply Vdd, and outputs a power outage detection signal PWD when an abnormal cutoff of the main power supply Vdd, that is, a power outage is detected. The main power supply Vdd is a power supply supplied from outside the device. The network device 21 operates using the main power supply Vdd in a normal state.

The emergency circuit 27 includes a battery 30, a power supply switching circuit 31, a first load switch SWa, a DCDC converter 32, a controller 33, a plurality of coupling circuits 34[1] to 34[n], and a plurality of coupling circuits 34[1] to 34[n]. It includes second load switches SWb[1] to SWb[n]. Battery 30 generates a backup power source Vbat. The battery 30 may be, for example, a primary battery such as a lithium metal battery, or a secondary battery such as a lithium ion battery. If the battery 30 is a secondary battery, a charging control circuit (not shown) or the like is provided to charge the battery 30 from the main power source Vdd.

The first load switch SWa supplies backup power Vbat from the battery 30 to the plurality of ports P[1] to P[n] and the controller 33 when a power outage occurs. The first load switch SWa supplies the backup power supply Vbat to the plurality of ports P[1] to P[n], as well as the optical transceiver TR and the controller 33 via the DCDC converter 32 in this example.

The power supply switching circuit 31 controls the first load switch SWa with a switch control signal SONa based on the power failure detection signal PWD from the power failure detection circuit 26. Specifically, the power supply switching circuit 31 controls the first load switch SWa to be turned off during a period when a power outage is not occurring, and turns on the first load switch SWa during a period when a power outage is occurring. Control.

The DCDC converter 32 converts the voltage value of the backup power supply Vbat from the battery 30 into a voltage value such as 3.3V required by the plurality of ports P[1] to P[n] and, ultimately, the optical transceiver TR. Then, the DCDC converter 32 supplies the voltage-converted backup power supply Vbat to the plurality of ports P[1] to P[n], and further supplies it to the controller 33. This allows optical transceiver TR and controller 33 to operate with a stable power supply voltage.

The plurality of second load switches SWb[1] to SWb[n] are connected to a backup power supply Vbat, specifically, between the backup power supply Vbat from the DCDC converter 32 and the plurality of ports P[1] to P[n]. are provided on each power supply path. The plurality of coupling circuits 34[1] to 34[n] are inserted on the signal paths from the physical layer processing circuit 25 to the plurality of ports P[1] to P[n], respectively. In the specification, the plurality of coupling circuits 34[1] to 34[n] are collectively referred to as coupling circuits 34.

The controller 33 is configured by, for example, a microcontroller including a processor, a timer, etc., an FPGA, an ASIC, or the like. Roughly speaking, after a power outage occurs, the controller 33 activates each of the plurality of ports P[1] to P[n] during an active period (referred to as Ta) that is determined so as not to overlap with each other. Then, the controller 33 controls so that a maintenance signal (referred to as SD) is transmitted from the activated port P. Specifically, the controller 33 performs sequence control as shown in FIG. 4 by, for example, program processing using a processor.

In the example of FIG. 4, the controller 33 divides the active periods Ta[1] to Ta[n] of the plurality of ports P[1] to P[n] into a first wait period TwA between adjacent active periods Ta. will be determined sequentially. Specifically, the controller 33 controls the plurality of second load switches SWb[1] to SWb[n], respectively, with switch control signals SONb[1] to SONb[n] having on periods that do not overlap with each other. Thereby, the controller 33 determines active periods Ta[1] to Ta[n] that do not overlap with each other.

Further, the controller 33 controls enable/disable of transmission operations at the plurality of ports P[1] to P[n] using transmission enable signals TXEN[1] to TXEN[n], respectively. In detail, for example, the controller 33 controls the transmission enable signal TXEN[1] to be in a valid state during the on period of the switch control signal SONb[1], and similarly controls the transmission enable signal TXEN[1] to a valid state during the on period of the switch control signal SONb[n]. , controls the transmission enable signal TXEN[n] to be in a valid state. Note that the controller 33 can arbitrarily set the length of each period using a timer.

Further, the controller 33 outputs the maintenance signal SD to the activated port P in order to cause the activated port P, that is, the port P in the active period Ta, to transmit the maintenance signal to the opposite device. In the examples of FIGS. 3 and 4, the controller 33 outputs the maintenance signal SD[1] to the port P[1], and similarly outputs the maintenance signal SD[n] to the port P[n]. Note that, more specifically, the maintenance signal SD is transmitted to the port P via the coupling circuit 34.

The maintenance signal SD is based on signal detection in the opposing device, that is, the network device 11 in FIG. determined. In other words, these are the specifications for disconnection detection. The maintenance signal SD is usually a signal with a predetermined frequency or a pulse signal that changes between "1" and "0" at a predetermined bit rate. In this case, the maintenance signal SD becomes a modulation signal to the optical transceiver TR corresponding to this pulse signal. However, depending on the specifications of the opposing device, the maintenance signal SD may be a signal that causes the optical transceiver TR to transmit an optical signal of constant strength without a modulation signal.

In FIG. 3, the coupling circuit 34 is inserted on the signal path from the physical layer processing circuit 25 to the plurality of ports P[1] to P[n], as described above. The coupling circuit 34 then couples the output of the controller 33 to the signal path of the activated port P. As a result, the coupling circuit 34[1] sends the electrical signal ES[1] from the physical layer processing circuit 25 or the maintenance signal SD[1] from the controller 33 to the port P[1] as an electrical signal ED[1]. Output. Similarly, the coupling circuit 34[n] sends the electrical signal ES[n] from the physical layer processing circuit 25 or the maintenance signal SD[n] from the controller 33 to the port P[n] as an electrical signal ED[n]. Output.

The coupling circuit 34[1] may be configured, for example, by adding a low capacitance diode to the signal path of the maintenance signal SD[1] so as not to degrade the electrical signal ED[1] during normal operation. Specifically, the coupling circuit 34[1] may be configured by, for example, a PIN diode inserted on the signal path of the maintenance signal SD[1] with the output side of the controller 33 as an anode. The same applies to the coupling circuit 34[n].

In such a configuration, assume that maintenance signals SD are simultaneously transmitted from a plurality of ports P[1] to P[n] to the opposing device. In this case, there is a possibility that the backup power supply Vbat using the battery 30 may not be able to sufficiently secure the power consumption, that is, the voltage value and current value, required by the optical transceiver TR. Therefore, as shown in FIG. 4, it is beneficial to distribute the power consumption by providing active periods Ta[1] to Ta[n] that do not overlap with each other. As a result, the operation of the optical transceiver TR in particular can be guaranteed, and the quality of the optical signal can be sufficiently ensured.

Note that in the example of FIG. 3, the active periods Ta[1] to Ta[n] are determined by the switch control signals SONb[1] to SONb[n], but instead, the active periods Ta[1] to Ta[n] are determined by the transmission enable signal TXEN[1] ~TXEN[n]. That is, it is also possible to delete the second load switches SWb[1] to SWb[n]. However, in this case, since standby current is generated in the optical transceiver TR during the inactive period, the power consumption dispersion effect described above may be weakened, and furthermore, the duration of operation by the backup power supply Vbat may be shortened. From this point of view, it is advantageous to provide the second load switches SWb[1] to SWb[n].

Further, the network device 11 in the upper network 10 in FIG. 1 may have the same configuration as the network device 21 in the lower network 20 shown in FIG. 3. However, the network device 11 usually uses an uninterruptible power supply (UPS) or the like in many cases. In this case, the network device 11 does not need to include the emergency circuit 27.

<Network system operation>
FIG. 5 is a sequence diagram showing an example of the operation of main parts related to the present invention in the network system of FIG. In FIG. 5, the network device 21 in the lower network 20, specifically, the power failure detection circuit 26, detects a power failure, that is, an abnormal interruption of the main power supply Vdd (step S101a). In response, the power failure detection circuit 26 outputs a power failure detection signal PWD (step S101b).

In addition, in response to the power outage detection in step S101a, the network device 21 sends a power outage notification to the network device (opposite device) 11 in the upper network 10, for example, using the remaining power of the main power supply Vdd stored in the capacitor. A frame etc. is transmitted (step S101c). In response, the network device (opposite device) 11 recognizes that a power outage has occurred in the network device 21 (step S301). Examples of the power outage notification frame include a maintenance frame for a "Dying Gasp" event based on the IEEE 802.3ah standard.

Further, the emergency circuit 27 in the network device 21 switches the power to the backup power source Vbat by controlling the first load switch SWa according to the power failure detection signal PWD in step S101b (step S102). That is, the emergency circuit 27 switches the power source of the plurality of ports P[1] to P[n] and the controller 33 to the backup power source Vbat.

Subsequently, the emergency circuit 27 starts supplying power to the port P[1] by turning on the second load switch SWb[1] (step S103). Next, the emergency circuit 27 generates a maintenance signal SD[1] to the port P[1] (step S104a), and sends the maintenance signal SD[1] to the port P[1] via the coupling circuit 34[1]. ] (step S104b). In response, the optical transceiver TR attached to port P[1] generates an optical signal modulated with the maintenance signal SD[1] (step S105a), and transmits the optical signal to the network device (opposite device). 11 (step S105b)

Subsequently, the network device (opposite device) 11 determines whether or not the corresponding optical fiber 15 is disconnected, depending on whether or not the optical signal in step S105b has been received (step S302). When the network device (opposite device) 11 receives an optical signal, it determines that the corresponding optical fiber 15 is not disconnected, and when it does not receive an optical signal, it determines that the corresponding optical fiber 15 is disconnected. .

On the other hand, after the transmission of the optical signal in step S105b is completed, the emergency circuit 27 controls the second load switch SWb[1] to turn off, thereby stopping the power supply to the port P[1]. (Step S106). The period from step S103 to step S106 corresponds to the active period Ta[1] shown in FIG. 4. The length of the active period Ta[1] is determined to be the minimum necessary size for performing the processes of steps S104a, S104b and steps S105a, S105b. As a specific example, the active period Ta[1] may be about several seconds.

After step S106, the emergency circuit 27 waits for a predetermined period (step S107). Thereafter, processing similar to the processing of steps S103 to S107 and S302 for port P[1] is performed for the next port (P[2], not shown). Finally, processing similar to the processing of steps S103 to S107 and S302 for port P[1] is performed for port P[n] (steps S203 to S207, S303).

The predetermined period in step S107 corresponds to the first wait period TwA shown in FIG. 4. In particular, when the battery 30 is a battery with a small current capacity, such as a lithium metal battery, the voltage value of the battery 30 temporarily drops as the optical transceiver TR operates. However, the voltage value of the battery 30 may gradually return during the first wait period TwA. By returning the voltage value of the battery 30, the input current to the DCDC converter 32 can be kept low, and the battery life can be kept long. The length of the first wait period TwA is determined, for example, in consideration of such characteristics of the battery 30. As a specific example, the first wait period TwA may be approximately several seconds to several tens of seconds.

After passing through the first wait period TwA targeting port P[n] in step S207, the emergency circuit 27 further waits for a predetermined period, and then returns to the process of step S103 (step S208 ). That is, the controller 33 activates the plurality of ports P[1] to P[n] during the active period Ta[1] to Ta[n] during the power outage period, and then activates the ports P[1] to P[n] in the active period Ta[1] to Ta[n]. After a second wait period (referred to as TwB), the process of activating each of the plurality of ports in the active period is repeated again. The second wait period TwB in step S208 may be set after determining the duration of the backup power supply Vbat, for example, taking into consideration the frequency of disasters that may occur in a year.

Note that when the network device 21 recovers from the power outage, the network device 21 performs, for example, a predetermined initialization process with the network device (opposite device) 11 using the main power supply Vdd. The network device (opposite device) 11 can perform disconnection detection even during this initialization process.

<Details around the DCDC converter>
FIG. 6 is a diagram showing a detailed configuration example around the DCDC converter in FIG. 3. FIG. 6 shows a battery 30 and a step-up DC/DC converter 55 corresponding to the DC/DC converter 32 in FIG. 3. The battery 30 outputs a voltage value V1. The step-up type DCDC converter 55 outputs the voltage value V2 by boosting the voltage value V1.

The battery 30 is configured by connecting a plurality of batteries with a small current capacity, such as lithium metal batteries, in parallel. The voltage value V1 is, for example, 3.0V or less. On the other hand, the voltage value V2 is 3.3V or the like. This voltage value V2 is applied to the optical transceiver TR. By using such a configuration, even when using a battery with a small current capacity, it is possible to apply a stable voltage value V2 to the optical transceiver TR.

FIG. 7 is a diagram showing a detailed configuration example around the DCDC converter in FIG. 3, which is different from that in FIG. 6. FIG. 6 shows a battery 30, a step-up DC/DC converter 56, a capacitor 57, and a step-down DC/DC converter 58, which correspond to the DC/DC converter 32 in FIG. Battery 30 outputs voltage value V3. The step-up DCDC converter 56 outputs a voltage value V4 higher than the voltage for operating the optical transceiver TR by boosting the voltage value V3. The capacitor 57 has a somewhat large capacitance value and holds the voltage value V4. The step-down type DC/DC converter 58 steps down the voltage value V4 held by the capacitor 57 to output a voltage value V5.

The voltage value V3 is, for example, about 1.8V. The voltage value V4 is set to a sufficiently high voltage such as 6V or more, for example. The voltage value V5 is 3.3V or the like. This voltage value V5 is applied to the optical transceiver TR. If such a configuration is used, even if the voltage supply from the battery 30 is stopped, the capacitor 57 will maintain a somewhat high voltage value V4, so even if the optical transceiver TR operates, the voltage value such as 3.3V will remain unchanged. It becomes easier to maintain V5. That is, by setting the voltage value V4 larger and increasing the capacity of the capacitor 57, the life of the battery 30 can be maintained longer. The method shown in FIG. 7 is particularly effective when parallelizing the batteries 30 is difficult.

<Comparative example of disconnection detection method>
For example, as a disconnection detection method in a power outage state that is different from the method of the embodiment described above, there is a method that uses an uninterruptible power supply (UPS) as the power source of the network device 21, or a method that uses an OTDR in the network device (opposite device) 11. A method that includes a built-in optical time domain reflectometer (Optical Time Domain Reflectometer), etc. can be considered. When a UPS is used, a power outage itself does not substantially occur, so the network device 21 can send a predetermined maintenance frame etc. to the network device (opposite device) 11 using the main power supply Vdd, thereby detecting disconnection. It becomes possible to do this. However, providing a UPS may increase costs.

Further, the OTDR is a measuring instrument that detects the presence or absence of a break in the optical fiber 15, the location of the break, etc. by inputting a light pulse signal into the optical fiber 15 and receiving its scattered light, reflected light, and the like. For example, if the network device (opposite device) 11 has a built-in OTDR, a break in the optical fiber 15 can be detected even if the network device 21 is in a power outage state. However, in this case as well, incorporating an OTDR may lead to an increase in cost.

<Main effects of the embodiment>
As described above, by using the method of the embodiment, it is typically possible to grasp the status of the line, specifically, the optical fiber, even in a power outage state. As a result, it becomes possible to shorten the time required for failure recovery. Furthermore, compared to the wire breakage detection method of the comparative example described above, wire breakage can be detected more easily or at lower cost. That is, in the method of the embodiment, it is sufficient to add to the network device 21 an emergency circuit 27 as shown in FIG. 3, which can be realized at low cost. Further, there is no need to provide a special mechanism for transmitting and receiving optical signals as in OTDR, and disconnection detection can be performed using a normal optical transceiver TR as is.

As above, the invention made by the present inventor has been specifically explained based on the embodiments, but the present invention is not limited to the embodiments described above, and various changes can be made without departing from the gist thereof. For example, the embodiments described above have been described in detail to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to having all the configurations described. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. . Furthermore, it is possible to add, delete, or replace some of the configurations of each embodiment with other configurations.

10 Upper network 11 Network device (opposite device)
15 Optical fiber 20 Lower network 21 Network device 25 Physical layer processing circuit 26 Power outage detection circuit 27 Emergency circuit 30 Battery 31 Power switching circuit 32 DCDC converter 33 Controller 34 Coupling circuit 42 Analog front end (AFE) circuit 43 Optical subassembly (OSA) )
44 Controller 50 Driver 51 Preamp/Post Amplifier 55, 56 Step-up DC/DC converter 58 Step-down DC/DC converter 57 Capacitor CNe Electrical connector CNo Optical connector ED Electrical signal ES Electrical signal LD Laser diode P Port PD Photodiode PWD Power outage detection signal SD Maintenance signal SON Switch control signal SWa First load switch SWb Second load switch TR Optical transceiver TXEN Transmission enable signal Ta Active period TwA First wait period TwB Second wait period V1 to V5 Voltage value Vbat Backup power supply Vcc Power supply Vdd Main power supply

Claims (14)

multiple ports to which optical transceivers are attached;
an emergency circuit including a first load switch and a controller;
a battery that generates backup power;
has
the first load switch supplies the backup power from the battery to the plurality of ports and the controller when a power outage occurs;
After the power outage occurs, the controller activates each of the plurality of ports for a predetermined active period that does not overlap with each other, and controls the activated ports to transmit maintenance signals.
Network equipment. The network device according to claim 1,
The controller outputs a modulation signal to the optical transceiver as the maintenance signal to the activated port.
Network equipment. The network device according to claim 1,
The controller provides a first wait period between the adjacent active periods.
Network equipment. The network device according to claim 1,
The controller activates each of the plurality of ports in the active period during the period in which the power outage occurs, and then activates each of the plurality of ports again in the active period after a second wait period. repeating the process of converting
Network equipment. The network device according to claim 1,
The emergency circuit includes a plurality of second load switches each provided on a power supply path between the backup power source and the plurality of ports,
the controller determines the active period by controlling the plurality of second load switches;
Network equipment. The network device according to claim 1,
The emergency circuit includes a DC/DC converter that converts the voltage value of the battery into a voltage value required by the plurality of ports.
Network equipment. The network device according to claim 1,
It has a physical layer processing circuit that performs various processes required on the physical layer for the MAC (Medium Access Control) frame to be transmitted,
The emergency circuit includes a coupling circuit inserted on a signal path from the physical layer processing circuit to the plurality of ports and coupling an output of the controller to a signal path of the activated port.
Network equipment. A network device accommodated in the lower network;
A counter device accommodated in the upper network,
a plurality of optical fibers connecting the network device and the opposing device;
A network system having:
The network device includes:
a plurality of ports equipped with optical transceivers and connected to the plurality of optical fibers via the optical transceivers;
an emergency circuit including a first load switch and a controller;
a battery that generates backup power;
has
the first load switch supplies the backup power from the battery to the plurality of ports and the controller when a power outage occurs;
After the power outage occurs, the controller activates each of the plurality of ports for a predetermined active period that does not overlap with each other, and controls the activated ports to transmit maintenance signals.
network system. The network system according to claim 8,
The controller outputs a modulation signal to the optical transceiver as the maintenance signal to the activated port.
network system. The network system according to claim 8,
The controller provides a first wait period between the adjacent active periods.
network system. The network system according to claim 8,
The controller activates each of the plurality of ports in the active period during the period in which the power outage occurs, and then activates each of the plurality of ports again in the active period after a second wait period. Repeating the process of converting
network system. The network system according to claim 8,
The emergency circuit includes a plurality of second load switches each provided on a power supply path between the backup power source and the plurality of ports,
the controller determines the active period by controlling the plurality of second load switches;
network system. The network system according to claim 8,
The emergency circuit includes a DC/DC converter that converts the voltage value of the battery into a voltage value required by the plurality of ports.
network system. The network system according to claim 8,
The network device has a physical layer processing circuit that performs various processes required on the physical layer for a MAC (Medium Access Control) frame to be transmitted,
The emergency circuit includes a coupling circuit inserted on a signal path from the physical layer processing circuit to the plurality of ports and coupling an output of the controller to a signal path of the activated port.
network system.

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