JP2003318903A - Subscriber's home apparatus for high speed network, and access network - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a subscriber's home apparatus for high speed network, and an access network for facilitating detection of a fault in a block from an ether switch of a common carrier to subscribers and capable of reducing the scale and the cost when configuring the access network by using transmission lines in compliance with the 1000 BASE-LX, SX. <P>SOLUTION: The subscriber's home apparatus 30 having a function of at least either of test and state monitor of a communication line is connected between a switch means 11 at the common carrier side and a subscriber apparatus 40, a monitor controller or test unit 12 is connected to a second port different from a first port and connected to the subscriber's home apparatus 30 or the subscriber apparatus 40 among a plurality of ports provided on the switch means 11, the monitor controller or test unit 12 transmits a monitor control signal packet or a test signal packet to the subscriber's home apparatus 30 via the switch means 11, and the monitor controller or a test unit 12 receives the signal packet from the subscriber's home apparatus 30 via the switch means 11. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to 1000BASE.
-LX or 1000BASE-SX standard transmission line, that is, a high-speed network subscriber premises equipment using a gigabit network and an access network.

[0002]

2. Description of the Related Art Conventional communication services such as ISDN (Integrated Services Digital Network), SDH (Synchronous Digital Hierarchy), and ATM (Asynchronous Transfer Mode:
In a network of the asynchronous transfer mode), it is common to provide a subscriber home unit (hereinafter, DSU) on the subscriber home side.

That is, a subscriber device such as a FAX or a router used by a subscriber is not directly connected to a switch of a telecommunications carrier but is connected via a DSU. The DSU plays a role of a maintenance function and a monitoring function, and at the time of an abnormality, the communication carrier sends a test signal to isolate the cause of the failure. On the other hand, recently, 1000BASE-LX or 1000BASE-
A high-speed transmission line according to the SX standard can be used. It is also possible to provide an access network service by using a gigabit network using such a transmission line.

However, 1000BASE-LX, 1000
In a gigabit network such as BASE-SX, the form of providing DSU is not assumed. Therefore, when the access network service is provided using the gigabit network, the Ethernet switch of the telecommunications carrier and the subscriber device (router or the like) of each subscriber are directly connected.

[0005]

However, if the Ethernet switch of the telecommunications carrier and the subscriber device (router or the like) of each subscriber are directly connected, it becomes extremely difficult to identify the cause when an abnormality occurs. However, there is a conventional DSU between the Ethernet switch of the telecommunications carrier and the subscriber device of each subscriber.
When adding, there is a possibility that the configuration of the Ethernet switch of the communication carrier and the subscriber device of each subscriber must be changed. Further, it is desirable that it is possible to select for each subscriber whether DSU is necessary or not.

1000BASE-LX or 1000BA
In the Ethernet switch having the SE-SX interface, a complicated process such as a redundant bit conversion process (10B / 8B conversion, 8B / 10B conversion), a special code removal / insertion, a queuing process is performed on the code of the received frame. I have to

In the DSU, it is necessary to separate or superpose the user signal from the supervisory control signal / test signal. However, in the gigabit network, the complicated signal processing as described above is also performed in the DSU. Configuration becomes complicated. Also, the clock signal is ± 200ppm
Since it is necessary to ensure the accuracy of the above, it is necessary to provide a highly accurate crystal oscillator inside the DSU.

Furthermore, if a conventional Ethernet switch is provided inside the DSU in order to separate and superpose packets inside the DSU, there is a danger that the scale and cost will increase. The present invention is based on 1000BASE-LX or 1000BASE.
-When configuring an access network using an SX standard transmission line, it is easy to detect failures in the section from the telecommunications carrier's Ethernet switch to the subscriber, and join the high-speed network that can reduce the scale and cost. An object is to provide an in-house device and an access network.

[0009]

According to a first aspect of the present invention, there is provided a device between a switch device arranged on the communication carrier side and a subscriber device.
In an access network configured by connecting via a transmission line of 000BASE-LX or 1000BASE-SX standard, a subscriber premises apparatus having at least one of a test and a status monitor of a communication line is provided with the switch means and the subscriber. A monitoring control device or a test device is connected to a second port, which is different from the first port connected to the subscriber premises device or the subscriber device, among the plurality of ports included in the switch means and connected to the device. A monitor control signal packet or a test signal packet is sent from the monitor control device or test device to the subscriber premises device via the switch means, and the monitor control device or test device is connected to the subscriber premises. It is characterized in that a signal packet from the device is received via the switch means.

According to the first aspect of the present invention, the test signal from the monitor control device or the test device arranged on the communication carrier side is sent to the subscriber premises device as a packet on the network, and the test signal is transmitted from the subscriber premises device. The test signal can be sent to the monitor control device or the test device as a packet on the network. For this reason, it is not necessary to change the configuration of the switch means (ether switch) on the communication carrier side or the subscriber device on the subscriber side.

According to a second aspect of the present invention, in the access network according to the first aspect, the packet transmitted from the supervisory control device or the test device to the subscriber premises device is:
It is characterized in that the total number of frames including the payload, header and special codes before and after the packet is limited to an even number. When a signal destined for a subscriber premise device and a signal destined for a subscriber device are separated in the subscriber premise device, it is necessary to replace the signal frame. 100
Since the idle signal (idle ordered set) included in the signals of 0BASE-LX and 1000BASE-SX is composed of 2 frames, the supervisory control signal transmitted from the supervisory control device or the test device to the subscriber premises device.
By limiting the total number of test signal frames to an even number, signal replacement can be performed without problems.

According to a third aspect of the present invention, in the access network according to the first aspect, regarding a packet transmitted from the subscriber premises apparatus to the monitoring control apparatus or the test apparatus,
It is characterized in that the total number of frames including the payload, header and special codes before and after the packet is limited to an even number. When a signal destined for the switching means (ether switch) on the side of the communication carrier and a signal destined for the test apparatus are superposed on the subscriber premises equipment, it is necessary to replace the signal frame.

1000BASE-LX, 1000BASE
Since the idle signal (idle order set) included in the E-SX signal is composed of two frames, the frame of the supervisory control signal / test signal transmitted from the subscriber premises device to the supervisory control device or the test device. By limiting the total number to an even number, signal replacement can be performed without problems.

According to a fourth aspect of the present invention, 1000 BASE- is provided between the switch means arranged on the telecommunications carrier side and the subscriber device.
A subscriber premises equipment for a high-speed network, which is used for an access network connected via a transmission line of LX or 1000BASE-SX standard and has at least one of a function of a communication line test and a status monitor, and one input port And a packet separator having two output ports, a packet superimposing device having two input ports and one output port, one input port and one output port, and a MAC (Media Ac
cess control) and a monitoring function section for holding an address, and the input port of the packet separator and the output port of the packet superimposing unit are assigned for connection with the transmission line on the side of the communication carrier, and 1 output port and the first input port of the packet superimposing unit are allocated for connection with the subscriber equipment, and the second output port of the packet separating unit and the second input port of the packet superposing unit are connected to the monitoring function unit. Is characterized by.

In the subscriber premises apparatus of claim 4, since the MAC address is previously assigned to the monitoring function section,
It is possible to send a signal from the test equipment on the telecommunications carrier side to the monitoring function unit in the subscriber premises equipment. Packet separator
The packet addressed to the monitoring function unit and the packet addressed to the subscriber device can be separated by the MAC address. Packet superimposing
The packet from the monitoring function unit and the packet from the subscriber device can be superimposed and transmitted to the transmission path on the communication carrier side.

The MAC address is also assigned in advance to the supervisory control device and the test device for transmitting and receiving the supervisory control signal and the test signal on the telecommunications carrier side so that the ether switch and the subscriber device on the telecommunications carrier side can be provided. It is possible to send a signal to the supervisory control device or the test device without changing the. According to a fifth aspect of the present invention, in the subscriber premises equipment for high speed network according to the fourth aspect, the packet separator processes a signal applied to an input port of the packet separator in units of 10 bits and omits conversion of the number of bits. 1
When a packet signal having a MAC address addressed to the monitoring function unit is input from the monitor control device or the test device to the input port of the packet separator, the packet separator outputs the signal in units of 0 bits. The packet signal is transferred to the second output port of the packet separator, and the signal assigned as the idle order set is output to the first output port of the packet separator, and the carrier side is connected to the input port of the packet separator. When a packet signal having a MAC address other than the address of the monitoring function unit is input from the switch means of the switch unit, the packet signal is transferred to the first output port of the packet separator, and the packet separator inputs the packet signal. When an idle order set signal is input to the port, the first output port and the second output port of the packet separator are input. To characterized in that it transfers signals idle ordered set.

According to the present invention, the subscriber premises equipment replaces the idle order set with the supervisory control signal / test signal, whereby the supervisory control signal / test signal can be easily separated. However, a complicated process such as 10B / 8B conversion is omitted, and the signal is processed in units of 10 bits.
For example, when a user signal is input from the telecommunications carrier's Ethernet switch to the subscriber premises equipment, the signal sequence may be transferred to the subscriber equipment as it is from the subscriber premises equipment.

Further, when the supervisory control signal and the test signal are input to the subscriber premises equipment from the telecommunications carrier's Ethernet switch, the subscriber premises equipment internally captures and processes the signal sequence. If the idle order set is output to the subscriber device instead of the signal train, the normality of the subscriber device is maintained. According to a sixth aspect of the present invention, in the subscriber premises equipment for high speed network according to the fourth aspect, the packet superimposing unit processes a signal applied to an input port of the packet superimposing unit in units of 10 bits and omits conversion of the number of bits. And outputs the signal in 10-bit units, and temporarily outputs the signal sent from the subscriber device before outputting it.
An IFO circuit, an idle order set removing circuit for removing an unnecessary idle order set in a signal sent from the subscriber device, and a signal for accepting a signal from the subscriber device that has passed through the FIFO circuit and the idle order set removing circuit A switching circuit having two inputs and one output having one input and a second input for receiving a signal transmitted by the monitoring function unit, wherein the switching circuit is provided when a signal from the monitoring function unit is input. The bit pattern is preferentially output, and when the signal from the monitoring function unit is not input, the bit pattern of the signal from the subscriber device that has passed through the FIFO circuit and the idle order set removal circuit is output to output the idle pattern. In the order set removing circuit, the switching circuit selects the signal on the second input side and the idle order set exceeds the specified number. When input connection to, or if the and the idle ordered set exceeds the usage specified amount of FIFO circuit is continuously inputted exceeds the specified number,
The consecutive idle order sets are removed until a specified number is reached, and the FIFO circuit deletes the idle order set when the switching circuit selects the signal on the first input side or the idle order set removing circuit. When the input bit string is stored, the input bit string is extracted in the oldest order, and in other cases, the input bit string is temporarily stored.

According to the sixth aspect of the present invention, the subscriber premises device replaces the idle order set with the supervisory control signal / test signal, so that superimposition of the supervisory control signal / test signal is easily realized. However, a complicated process such as 10B / 8B conversion is omitted, and the signal is processed in units of 10 bits.
Regarding the user signal transmitted by the subscriber device, the subscriber premises device may simply transfer it to the telecommunications carrier's Ethernet switch as it is.

Further, regarding the supervisory control signal and the test signal, when idle order sets are continuously input from the subscriber device to the subscriber's home device, they can be replaced and transmitted to the Ethernet switch of the communication carrier. Good. However,
Idle ordered sets are not always continuously input from the subscriber device to the subscriber premises equipment. Therefore, it is necessary to create continuous idle order sets (or blanks) for superimposition when necessary.

A FIFO (first-in / first-out) circuit plays this role. While the supervisory control signal and the test signal are transmitted to the supervisory control device and the test device through the Ethernet switch of the communication carrier, the signal input from the subscriber device to the subscriber premises device is accumulated in the FIFO circuit. . Here, assuming that the bit rate is the same on both the input side and the output side of the subscriber's home device, the information stored in the FIFO circuit will not decrease as it is. Therefore, if seven or more idle ordered sets are consecutive in the FIFO circuit, the idle ordered sets are reduced to six. In this way, when the supervisory control signal / test signal is superposed, the storage amount of the FIFO circuit temporarily increases, but thereafter the storage amount of the FIFO circuit decreases.

According to a seventh aspect of the present invention, in the subscriber premises equipment for high-speed network according to the fourth aspect, the monitoring function unit determines the total number of frames constituting a packet to be transmitted to the monitoring control apparatus or the test apparatus as the packet. It is characterized in that it is limited to an even number, including the payload, header, and special codes before and after that. Since the idle order set is composed of two frames, signal replacement can be performed without problems by limiting the number of frames of the supervisory control signal / test signal to an even number.

According to an eighth aspect of the present invention, in the subscriber premises equipment for a high speed network according to the fourth aspect, when a normal signal is input from the subscriber device, the output of the monitoring function unit and the output of the packet superimposing unit. The clock and running disparity are synchronized with the signal timing output by the subscriber device, and during the loopback test or when the signal input from the subscriber device is cut off, the output of the monitoring function unit and the packet superimposing device The present invention is characterized by further comprising synchronization control means for synchronizing the output clock with the signal timing input from the transmission line on the communication carrier side.

According to the present invention, the timing of the signal output by the subscriber's home device is synchronously controlled so as to be dependent on the signal of the switch means side of the telecommunications carrier or the signal of the subscriber equipment depending on the situation. As a result, it is not necessary to incorporate a highly accurate clock generation circuit or the like into the subscriber premises equipment, and the number of parts of the subscriber premises equipment can be reduced. That is, in the downlink for transmitting a signal from the switch means of the telecommunications carrier to the subscriber device through the subscriber premises equipment, the clock and running disparity of the subscriber premises equipment output are synchronized with the output of the telecommunications carrier switch means. .

Further, in the upstream line for transmitting a signal from the subscriber equipment to the switch means of the communication carrier through the subscriber premises equipment, the clock and the running disparity of the subscriber premises equipment output are usually synchronized with the subscriber equipment. It shall be. However, when the clock cannot be obtained from the subscriber device at the time of failure or at the time of test, the clock of the uplink is assumed to be synchronized with the switching means of the communication carrier and taken out from the downlink.

According to a ninth aspect of the present invention, in the subscriber premises equipment for high speed network according to the fourth aspect, the packet separator receives a packet signal having the MAC address of the monitoring function unit from a transmission line on the side of a communication carrier, Further, when a predetermined pause state setting code is added to the payload of the packet signal, the packet signal is transferred to the monitoring function unit and a predetermined pause signal is output to the subscriber device side. It is characterized by

In the ninth aspect, a pause signal can be given to the subscriber device from the subscriber premises device by a predetermined packet transmitted from the communication carrier side to temporarily stop the operation of the subscriber device. . As a result, it is possible to prevent the untransmitted packets sent by the subscriber device from staying in the subscriber premises equipment, and to send the packets output by the monitoring function unit to the transmission path on the telecommunications carrier side. Become.

According to a tenth aspect of the present invention, in the subscriber premises equipment for high speed network according to the fourth aspect, when the predetermined test packet transmitted from the test apparatus is input from the transmission line of the communication carrier side, the packet is received. It is further characterized in that a loopback test means for outputting the test packet to the transmission path on the communication carrier side via the monitoring function unit and the packet superimposing unit is further provided.

According to the tenth aspect, the test packet transmitted from the test device on the communication carrier side can be sent back to the test device through the down transmission line, the subscriber premises device, and the up transmission line. A loopback test can be performed between the test device and the subscriber premises device. This allows
It is possible to identify whether the point where the failure has occurred is on the side of the telecommunications carrier or on the side of the user with the subscriber home device as the boundary.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a subscriber premises equipment for a high speed network and an access network according to the present invention will be described with reference to FIGS. This form corresponds to all the claims. FIG. 1 is a block diagram showing a configuration example of an access network. FIG. 2 is a block diagram showing the configuration of the subscriber home device. FIG. 3 is a flowchart showing the operation (1) of the packet separation unit. FIG. 4 is a flowchart showing the operation (2) of the packet separation unit. FIG. 5 is a flow chart showing the operation during the folding back test.

In this embodiment, the switch means of claim 1
Subscriber equipment, transmission lines, subscriber premises equipment and test equipment are
Each corresponds to the Ethernet switch 11, the subscriber device 40, the transmission line 14, the subscriber premises device 30, and the test device 12. Further, the packet separator, the packet superimposing unit and the monitoring function unit of claim 4 correspond to the packet separating unit 32, the packet superimposing unit 35 and the monitoring function unit 33, respectively. The FIFO circuit, the idle order set removing circuit and the switching circuit according to claim 6 correspond to the FIFO circuit 36, the IOS removing circuit 37 and the switching circuit 38, respectively.

In the access network shown in FIG. 1, the Ethernet switch 11 arranged in the telecommunications carrier's office (for example, telephone office) 10 has a plurality of subscriber devices 40 (1), 4
Transmission lines 14 (2), 14 (3), 1 connected to 0 (2), 40 (3)
It houses four (4).

The Ethernet switch 11 connects a plurality of transmission lines accommodated similarly to a hub used for a LAN or the like. Further, the Ethernet switch 11 includes a function for determining the communication speed and the communication quality, like the ATM switch. In the example of FIG. 1, the Ethernet switch 11 has four input / output ports 13 (1), 13 (2), 13 (3), 13
(4) is provided.

Each input / output port 13 of the Ethernet switch 11
14 (1), 14 (2), 14 (3), 14 connected to the
(4) is configured according to 1000BASE-LX or 1000BASE-SX, which is a standard for gigabit networks. Each transmission line 14 is provided with two independent optical fibers for the uplink and the downlink.

In this example, between the subscriber device 40 (1) and the transmission line 14 (2) and between the subscriber device 40 (2) and the transmission line 14
Subscriber premises equipment (DSU) 3 between (3) and
0 (1) and 30 (2) are connected. In addition, 1000BASE-L is also provided between the subscriber home device 30 and the subscriber device 40.
They are connected by a transmission line 21 of X or 1000BASE-SX standard. A router or a computer is connected to each subscriber device 40, for example.

The subscriber premises equipment 30 is provided for line testing (confirmation test when the line is opened, failure point evaluation test when there is a failure, etc.) and line monitoring during normal times. The setting state of the subscriber home device 30 can be changed by a remote instruction. However, regarding the subscriber device 40 (3) that does not require the subscriber premises device 30, the subscriber premises device 30
The subscriber device 40 (3) can be directly connected to the Ethernet switch 11 by omitting the installation.

Input / output port 13 of Ethernet switch 11
The test device 12 having the functions of monitoring control and various tests is connected to (1) via a transmission line 14 (1). Therefore, the Ethernet switch 11 sends the supervisory control signal or the test signal packet sent from the test apparatus 12 to each subscriber premises apparatus 3
0 (1), 30 (2), and each subscriber home device 30
The test signal packet or the like sent by (1) or 30 (2) can be transferred to the test apparatus 12. Therefore, the test apparatus 1
2 and each of the subscriber home devices 30 (1) and 30 (2) can communicate with each other via the Ethernet switch 11.

Therefore, for example, the test device 12 transmits a predetermined test packet to the subscriber premises device 30, and the test packet returned inside the subscriber premises device 30 is transmitted from the subscriber premises device 30 to the test device 12. By doing so, it is possible to identify whether or not the line between the Ethernet switch 11 and the subscriber premises device 30 is normal. That is, when a failure occurs, it is possible to identify whether the failure point exists on the telecommunications carrier side or the user side with the subscriber home device 30 as a boundary.

As shown in FIG. 2, the subscriber premises equipment 30 has a connector (gigabit interface connector: GBI).
C) 31, packet separator 32, monitoring function unit 33, connector 34 (Gigabit interface connector: GBI)
C) and the packet superimposing device 35. Further, the packet superimposing device 35 includes a FIFO circuit 36 and an IOS removing circuit 3.
7 and a switching circuit 38.

The monitoring function unit 33 controls the line monitoring and test packet processing. The monitoring function unit 33 is a MAC (Media Access Controller) that is pre-assigned to itself.
ol) holds the address. The packet separator 32 is
The signal input from the transmission line 14 is separated into a signal addressed to the monitoring function unit 33 and a signal addressed to the other parts. The packet superimposing unit 35 superimposes the signal input from the subscriber device 40 and the signal input from the monitoring function unit 33.

The signal (packet) transmitted from the Ethernet switch 11 on the communication carrier side is received by the connector 31 and transferred to the packet separator 32. Packet separator 32
When the destination of the packet input to the packet matches the MAC address assigned to the monitoring function unit 33, the packet separator 32 transfers the packet to the monitoring function unit 33. If the destination of the packet is other than the monitoring function unit 33, the packet separator 32 routes the packet to the connector 34.
To the subscriber device 40 via.

The packet superimposing unit 35 superimposes the packets transmitted from the subscriber device 40 and the monitoring function unit 33, and transfers the packets to the Ethernet switch 11 via the connector 31. By the way, in digital signal processing, it is general to process signals every 8 bits, that is, every 1 byte. However, 1000BASE-LX or 1000BASE-
In the SX standard line, 8 bits are added to 10 bits, including redundant bits.
The signal is converted into bits, the signal is processed every 10 bits, and the signal is transmitted in units of 10 bits.

In this case, the conversion from 8 bits to 10 bits is called 8B / 10B conversion, and the conversion from 10 bits to 8 bits is called 10B / 8B conversion. 1000B
In a device such as a general Ethernet switch that accommodates a line of ASE-LX or 1000BASE-SX, 8
The signal is processed by performing B / 10B conversion and 10B / 8B conversion. However, if such a conversion function is installed, it is inevitable that the configuration of the device becomes complicated and the size becomes large.

Therefore, in the subscriber premises equipment 30 of this embodiment, 8B / 10B conversion and 10B / 8B conversion are not performed, and the input signal is processed as it is in units of 10 bits and the signal is output in units of 10 bits. . A specific operation example of the packet separator 32 will be described with reference to FIG. In addition, 1000BASE-LX or 1000BASE
In communication on the E-SX line, a special signal called "idle ordered set" is inserted between a signal packet and the next signal packet.

The bit pattern of the idle ordered set is "0011111010 1001000101", and one idle ordered set is composed of 20 bits of two frames. Further, it is specified that at least 6 idle order sets are inserted between a signal packet and the next signal packet.

When the idle order set is input to the packet separator 32, steps S12 to S in FIG.
Proceed to 13. In this case, the packet separator 32 outputs the idle ordered set to the subscriber device 40 and also outputs the idle ordered set to the monitoring function unit 33. On the other hand, when a packet addressed to the monitoring function unit 33 is input to the packet separator 32, that is, the MAC of the monitoring function unit 33 described in 10-bit code as the destination of the packet.
If the address is included, the packet separator 32
The process proceeds to step S15 from step S14 in FIG.

In this case, the packet separator 32 transfers the input packet to the monitoring function unit 33, and
The idle order set is output to the subscriber device 40 instead of the packet. On the other hand, the destination is the monitoring function unit 33.
When a packet other than the addressed one is input to the packet separator 32, the processing of the packet separator 32 is performed in step S of FIG.
It progresses from S14 to S16. In this case, the input packet is output to the subscriber device 40 and the idle order set is output to the monitoring function unit 33 instead of the packet.

By the way, as described above, the basic length of the idle ordered set is 20 bits for two frames. Therefore, when the packet and the idle order set are replaced as shown in FIG. 3, in order to seamlessly receive the data and the idle order set from the side of the subscriber device 40, the packet sent to the monitoring function unit 33. It is necessary that the number of frames that make up is even.

Therefore, in this embodiment, the number of frames constituting the packet transmitted by the test apparatus 12 to the packet separator 32 is limited to an even number. On the other hand, the packet superimposing device 35
Also in (1), the signal is processed in 10-bit units without converting the number of bits.

FIFO built in the packet superimposing unit 35
The circuit 36 temporarily stores the signal input from the subscriber device 40. The IOS removal circuit 37 is the FIFO circuit 3
Remove the extra idle ordered set in the signal stored in 6. Further, the switching circuit 38 selectively inputs one of the signal input from the subscriber device 40 and the signal input from the monitoring function unit 33, superimposes the signals of the two systems, and transmits them to the Ethernet switch 11 side.

Normally, the switching circuit 38 outputs the packet transmitted from the subscriber device 40 to the connector 31 side. However, when a packet to be transmitted to the Ethernet switch 11 side is generated in the monitoring function unit 33, the switching circuit 38 selects the packet output from the monitoring function unit 33 and selects the connector 31.
Output to. While the switching circuit 38 is selecting the packet of the monitoring function unit 33, the packet input from the subscriber device 40 to the packet superimposing unit 35 is accumulated inside the FIFO circuit 36.

However, when the subscriber device 40 frequently outputs packets, the packets accumulated in the FIFO circuit 36 are accumulated and gradually increase. The IOS removal circuit 37 is provided to reduce the queue length of the data stored in the FIFO circuit 36. As described above, at least 6 idle order sets must be consecutively present between one packet and the next packet, but in an actual signal, one packet and the next packet are In many cases, 7 or more consecutive idle order sets are included between.

For example, when there is little traffic, it takes time from the arrival of one packet until the arrival of the next packet, and as a result, the number of idle ordered sets inserted between packets increases. .

Therefore, more than 6 idle ordered sets existing between packets are unnecessary and may be deleted. If you delete unnecessary idle ordered sets,
The queue length of data in the O circuit 36 can be reduced. Therefore, the IOS removal circuit 37 operates as follows. (1) When the switching circuit 38 has selected the packet from the monitoring function unit 33 and detects seven or more consecutive idle ordered sets on the FIFO circuit 36, an extra idle ordered set is deleted. And set the number of idle order sets to 6.

(2) If the queue length of the FIFO circuit 36 is greater than or equal to a predetermined value, the FIFO circuit 36
When seven or more consecutive idle ordered sets are detected, the redundant idle ordered sets are deleted to set the number of idle ordered sets to six. To delete the actual idle ordered set, an extra idle ordered set is read from the FIFO circuit 36 and discarded.

By the way, as described above, the basic length of the idle ordered set is 20 bits for two frames. Therefore, when the switching circuit 38 superimposes the packet and the idle order set, in order to seamlessly receive the data and the idle order set from the side of the Ethernet switch 11, the packet transmitted from the monitoring function unit 33 is configured. It is necessary that the number of frames to be played is even. Therefore, regarding the supervisory control signal and the test signal output by the supervisory function unit 33, the number of frames constituting the supervisory control signal is limited to an even number.

By the way, 1000BASE-LX or 1
In a communication network using a 000BASE-SX line, the frequency of the clock is often different between the uplink and the downlink. Further, when a device is inserted in the middle of a line, the device transmits a signal by using a clock internally generated internally, and therefore the clock frequency is often different between the input and the output of the device.

In the subscriber premises equipment 30 of this embodiment, the timing of signals such as clocks is independent between the uplink and the downlink, and the clock of the signal output on the uplink is the clock of the signal input on the uplink. , And the clock of the signal output on the downlink is controlled to be synchronized with the clock of the signal input on the downlink.

As for the running disparity (RD) of the code, the timing of the output signal is controlled so as to be synchronized with the timing of the input signal, similarly to the clock. By such control, the following merits are obtained. (1) Since it is not necessary to provide a clock generation circuit inside the subscriber premises device 30, the configuration is simplified and the cost can be reduced.

(2) When viewed from the Ethernet switch 11 and the subscriber device 40, no special changes are made to the clock and RD. Therefore, the Ethernet switch 11 and the subscriber device 40 are not changed.
Does not need to be changed. However, it is assumed that the subscriber premises device 30 cannot obtain the clock on the side of the subscriber device 40 during the loopback test or when the subscriber device 40 fails. Therefore, in that case, the subscriber premises equipment 30 outputs a signal such as a clock at a timing synchronized with the clock of the signal input from the Ethernet switch 11 to the subscriber premises equipment 30.

By the way, when the packets transmitted from the subscriber device 40 are continuous, the packet superimposing unit 35 cannot superimpose the two systems of signals because there is no idle time. Therefore, a pause function is required to temporarily stop the sending operation of the subscriber device 40 in response to an instruction from the test apparatus 12. To realize this pause function,
The operation of the packet separator 32 may be changed as shown in FIG.

The test apparatus 12 transmits a predetermined special signal packet to the subscriber premises equipment 30 via the Ethernet switch 11 when the response from the subscriber premises equipment 30 is not obtained for a predetermined time or longer.

The destination of this special signal packet is the MAC address assigned to the monitoring function unit 33, and the format is a normal gigabit network packet.
A reserved code is assigned to the payload in advance. When the monitoring function unit 33 of the subscriber home device 30 receives the special signal packet, the process of the packet separator 32 proceeds from step S21 to step S22 in FIG. Therefore, the pause signal packet is output to the subscriber device 40 instead of the idle order set.

When the subscriber device 40 receives the pause signal packet, it temporarily suspends the packet transmission to the uplink, which reduces the queue of the FIFO circuit 36. Therefore, the packet output from the monitoring function unit 33 can be superimposed on the packet superimposing unit 35 and transmitted. The operation of the subscriber premises device 30 during the return test is shown in FIG.
As shown in.

In the case of carrying out the folding back test, the test apparatus 1
2 transmits a “LOOP1 test start packet” to the monitoring function unit 33 of the subscriber home device 30. Monitoring function unit 33
5 receives the “LOOP1 test start packet (Layer-2)” from the test apparatus 12, step S in FIG.
At 32, an ACK packet is output to the test apparatus 12. The ACK packet is superimposed on the upstream signal by the switching circuit 38 and transmitted to the test apparatus 12.

In step S33, the signal flow on the subscriber device 40 side is cut off. As a result, during the loopback test, the switching circuit 38 selects and transmits only the output signal of the monitoring function unit 33. Further, during the loopback test, the monitoring function unit 33 processes the signal in both the upper and lower lines in synchronization with the timing of the clock signal on the station side (S34).

After starting the loopback test, the monitoring function unit 3
3 receives the test packet (Layer-2) (S
35), the monitoring function unit 33 replaces the destination (DA) and the source (SA) of the received test packet and returns the test packet to the test apparatus 12 (S37). This operation is repeated until the test end packet is received. When the test end packet is received, an ACK packet is transmitted to the test apparatus 12 in step S38, and the subscriber premises apparatus 30 returns to the normal mode (S39).

That is, the subscriber premise apparatus 30 monitors the test packet transmitted from the test apparatus 12 from the setting of the loopback test to the cancellation of the loopback test.
Then, it is sent back to the loopback test apparatus 12. By carrying out such a turn-back test, it is possible to isolate the cause when a failure occurs. For example, if there is no problem in the loopback test, it can be inferred that a failure has occurred on the subscriber device 40 side rather than the subscriber home device 30.

[0069]

As described above in detail, according to the present invention, 1000BASE-LX or 1000BASE.
-When implementing an access network service using the SX line, a subscriber's home device can be installed to be useful for line monitoring and the like. Moreover, it is not necessary to make special changes to the switch means and subscriber equipment provided on the telecommunications carrier side.

It is also possible to select the necessity / unnecessity of the subscriber home device for each user. Furthermore, the separation and superimposition of the supervisory control signal and the test signal in the subscriber premises equipment can be realized with a simple configuration, so that the subscriber premises equipment can be downsized and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of an access network.

FIG. 2 is a block diagram showing a configuration of a subscriber home device.

FIG. 3 is a flowchart showing an operation (1) of a packet separation unit.

FIG. 4 is a flowchart showing an operation (2) of the packet separation unit.

FIG. 5 is a flow chart showing an operation during a folding back test.

[Explanation of symbols]

10 station 11 Ether Switch 12 test equipment 13 I / O ports 14 Transmission line 20 subscriber's house 21 Transmission line 30 subscriber premises equipment 31 connector 32 packet separator 33 Monitoring function section 34 connector 35 packet superimposing device 36 FIFO circuit 37 IOS removal circuit 38 Switching circuit 40 subscriber equipment

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hitoshi Uematsu             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation F term (reference) 5K033 AA05 CC01 DB13 DB22 EA02                       EA03 EA06 EA07                 5K035 CC05 DD03 EE01 GG01 JJ01

Claims (10)

[Claims] 1. 1000BASE-LX or 1 is provided between a switch device arranged on the side of a communication carrier and a subscriber device.
In an access network configured by connecting via a transmission line of 000BASE-SX standard, a subscriber premises device having at least one of a function of a communication line test and a status monitor is provided between the switch means and the subscriber device. Connecting a monitoring control device or a test device to a second port different from the first port connected to the subscriber home device or the subscriber device among the plurality of ports provided in the switch means, A supervisory control device or a test device sends a supervisory control signal packet or a test signal packet to the subscriber premises device via the switch means, and the supervisory control device or test device sends a signal from the subscriber premises device. An access network for receiving a packet via the switch means. 2. The access network according to claim 1, wherein a packet transmitted from the supervisory control device or the test device to the subscriber premises device includes a payload, a header and special codes before and after the packet. An access network characterized by limiting the total number of frames to an even number. 3. The access network according to claim 1, wherein a packet transmitted from the subscriber premises device to the monitor control device or the test device includes a payload, a header, and special codes before and after the packet. An access network characterized by limiting the total number of frames to an even number. 4. 1000 BASE-LX or 1 is provided between the switch means arranged on the telecommunications carrier side and the subscriber device.
A subscriber premises equipment for high-speed network, which is used for an access network connected through a transmission line of 000BASE-SX standard and has at least one of a function of a communication line test and a status monitor, comprising one input port and two A packet separator having one output port, a packet superimposing device having two input ports and one output port, a monitoring function having one input port and one output port, and holding a MAC address previously assigned to it And the input port of the packet separator and the output port of the packet superimposing device are assigned for connection with the transmission line on the side of the communication carrier, and the first port of the packet separating device is provided.
The output port and the first input port of the packet superimposing unit are assigned for connection with the subscriber equipment, and the second output port of the packet separating unit and the second input port of the packet superposing unit are connected to the monitoring function unit. Characteristic high-speed network subscriber premises equipment. 5. The subscriber premises equipment for high-speed networks according to claim 4, wherein the packet separator is a signal applied to an input port of the packet separator.
Processing is performed in units of 0 bits, the conversion of the number of bits is omitted, signals are output in units of 10 bits, and the input port of the packet separator has a MAC address addressed to the monitoring function unit from the monitoring control device or the test device. When a packet signal is input, the packet signal is transferred to the second output port of the packet separator, and the signal assigned as the idle ordered set is output to the first output port of the packet separator. When a packet signal having a MAC address other than the one for the monitoring function unit is input to the input port of the packet separator from the switching means on the communication carrier side, the first output port of the packet separator Forwards the packet signal to the input port of the packet separator, if an idle ordered set signal is input, Customer premises equipment for high-speed networks, wherein the transfer of signals of the idle ordered set to the first output port and a second output port of the packet separator. 6. The subscriber premises equipment for high-speed network according to claim 4, wherein the packet superimposing device sets the signal applied to the input port of the packet superimposing device to 1
A FIFO circuit that processes in 0-bit units, omits conversion of the number of bits, outputs signals in 10-bit units, and temporarily stores the signal sent from the subscriber device before outputting it, and from the subscriber device An idle order set removing circuit for removing an unnecessary idle order set in a signal to be transmitted, a first input for receiving a signal from a subscriber device that has passed through the FIFO circuit and the idle order set removing circuit, and the monitoring function unit A two-input one-output switching circuit having a second input for receiving a signal transmitted by the monitoring circuit, the switching circuit preferentially outputting the bit pattern when the signal from the monitoring function unit is input. However, if the signal from the monitoring function unit is not input, the FI
The bit pattern of the signal from the subscriber device that has passed through the FO circuit and the idle order set removing circuit is output, and in the idle order set removing circuit, the switching circuit selects the signal on the second input side and the idle order set is If more than the specified number is input continuously, or the FI
When the used amount of the FO circuit exceeds the specified amount and the idle order set exceeds the specified number and is continuously input, the idle circuit is removed until the specified idle ordered set reaches the specified number. When the circuit selects the signal on the first input side, or when the idle order set removing circuit deletes the idle order set, the input bit strings are taken out in the oldest order, and otherwise In the case of (1), the subscriber premises equipment for high-speed network is characterized by temporarily storing the input bit string. 7. The subscriber premises equipment for high-speed network according to claim 4, wherein the monitoring function unit configures the total number of frames constituting a packet to be transmitted to the monitoring control apparatus or the test apparatus as the packet. A subscriber premises equipment for high-speed networks, which is limited to an even number including the payload, header, and special codes before and after. 8. The subscriber premises equipment for high speed network according to claim 4, wherein when a normal signal is inputted from the subscriber device,
When the clock and running disparity of the output of the monitoring function unit and the output of the packet superimposing unit are synchronized with the signal timing output by the subscriber device, and during the loopback test or when the signal input from the subscriber device is cut off. A high-speed network subscription characterized by further comprising synchronization control means for synchronizing the clocks of the output of the monitoring function unit and the output of the packet superimposing unit with the signal timing input from the transmission path on the communication carrier side. In-house device. 9. The subscriber premises equipment for high-speed network according to claim 4, wherein the packet separator receives a packet signal having a MAC address of the monitoring function unit from a transmission line of a telecommunications carrier, and the packet separator. When a predetermined pause state setting code is added to the payload of the signal, the packet signal is transferred to the monitoring function unit and a predetermined pause signal is output to the subscriber device side. Subscriber premises equipment for high-speed networks. 10. The subscriber premises equipment for high speed network according to claim 4, wherein when the predetermined test packet transmitted from the test equipment is input from a transmission line on the side of a communication carrier, the received test packet is received. Is further provided with a loopback test means for outputting to the transmission path on the communication carrier side via the monitoring function unit and the packet superimposing device.