JP3344319B2 - Demand assignment multiplexing apparatus and control method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a demand assignment multiplexing apparatus and a control method therefor, and more particularly, to dividing a high-speed digital leased line into a fixed band, an on-demand band, and a frame relay band to generate a demand channel call. The present invention relates to a demand assignment multiplexing device that dynamically changes a frame relay band according to presence or absence.

[0002]

2. Description of the Related Art As a conventional demand assignment multiplexing apparatus, there is Japanese Patent Application No. 09-3550. Generally, the variable clock generation circuit of the demand assigning multiplexing device of the present invention calculates the frame relay speed according to the demand generation state in the local station device and the remote device, and transmits the frame relay speed between the local station and the remote station on the transmission path. The frame relay speed is transmitted via the control bits of the above, and a clock corresponding to the set speed is generated for communication.

However, the above-mentioned prior art has the following problems. The first problem is that the speed of the demand processing depends on the performance of the CPU. The reason is,
This is because the CPU monitors the demand channel call, sets the demand information register, and calculates the frame relay speed. If the demand is concentrated, the CPU may be overloaded.

[0004] The second problem is that the use efficiency of the transmission path is deteriorated. The reason is that it is necessary to assign control bits to a band on a transmission path in order to transmit frame relay speed information to a partner station. The third problem is that
This is to increase the circuit scale. The reason is that a register is needed to set the frame relay speed,
Further, a circuit for generating a clock pulse from the set frame relay speed is required.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned drawbacks of the prior art, and in particular to reduce the load on the CPU and change the frame relay band without interruption in response to demand. It is intended to provide a novel demand assignment multiplexing apparatus and a control method therefor, which enable the above.

It is another object of the present invention to provide a novel demand assigning multiplexing apparatus having improved transmission efficiency and a control method therefor.

[0007]

SUMMARY OF THE INVENTION The present invention basically employs the following technical configuration to achieve the above object. That is, a first aspect of the demand assignment multiplexing apparatus according to the present invention accommodates an on-demand terminal line connected only during communication and a frame relay terminal line having a variable communication speed, and the on-demand terminal line is connected to the line. In a demand assignment multiplexing device that allocates a signal of the on-demand terminal line to a predetermined band of a time-division transmission line band based on a demand signal generated at the time of connection, a demand from the on-demand terminal line is generated. only set a variable clock generating means allowed to vary the transmit and receive clocks of the frame relay terminal lines depending, before Symbol variable clock generating means,
A memory storing bit attributes of all bands of the transmission path;
A decoding unit that generates a first control signal indicating whether or not a frame relay band can be allocated based on a register storing demand information on the transmission side and a bit attribute stored in the memory and the demand information stored in the register; When state, and are not characterized by being constituted by the speed conversion unit for generating a first variable clock from the control signal and the reference clock generated by the decoding unit, and the second aspect, when communicating Only the on-demand terminal line to be connected to the line and a frame relay terminal line having a variable communication speed are accommodated, and the on-demand terminal line is time-divided based on a demand signal generated when the line is connected. In a demand assignment multiplexing apparatus which is assigned to a predetermined band of a transmission line band, a bit attribute and a route of all bands of the transmission line are assigned. A memory storing items, a register for storing the demand information of the transmission side, the first indicating whether the allocation of frame relay bandwidth based on said demand information and bit attributes stored in the memory is stored in the register
And a speed converter that generates a variable clock from the first control signal and the reference clock generated by the decoder, and converts the FR clock of the frame relay band for each route. The third aspect is characterized in that a third mode accommodates an on-demand terminal line connected only during communication and a frame relay terminal line having a variable communication speed. In a demand assignment multiplexer configured to allocate a signal of the on-demand terminal line to a predetermined band of a time-division transmission line band based on a demand signal generated when the terminal line is connected to the line, A memory storing bit attributes and channel numbers, a register storing demand information on the transmission side, and a bit attribute stored in the memory A decoding unit for generating a first control signal indicating whether or not a frame relay band can be allocated based on the demand information stored in the register; and a variable clock based on the first control signal and the reference clock generated by the decoding unit. a speed conversion unit that generates provided, Ru der those characterized by being variably configured the FR clock frame relay bandwidth for each channel.

[0008] Further, an aspect of the control method of the demand assigning multiplexing apparatus according to the present invention is to accommodate an on-demand terminal line connected only during communication and a frame relay terminal line having a variable communication speed. In a control method of a demand assigning multiplexing apparatus, wherein a signal of the on-demand terminal line is allocated to a predetermined band of a time-division transmission line band based on a demand signal generated when the terminal line is connected to the line, A first step of storing the bit attributes and transmission demand information of the entire band in a predetermined memory area of the own station, a second step of transmitting the bit attributes and transmission demand information of the entire band of the transmission path to a game station, A third step of outputting a first control signal indicating whether or not a frame relay band can be allocated based on the data in the memory area; By taking the logical product of the first control signal and the FR reference clock and is characterized in that it comprises a fourth step of generating a variable clock, a.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a demand assigning multiplexing apparatus for multiplexing a transmission line band of a high-speed digital leased line with a fixed data band, a demand multiplexing band, and a frame relay band. The transmission clock and the reception clock of the frame relay data for changing the band dynamically and without interruption are made variable.

In FIG. 1, a device A is connected via a transmission line 10.
When the device A and the device B are communicating with each other, the device A and the device B respectively store the bit attribute of the entire band of the transmission path 10 in the memory 2.
The bit attributes are read from 1 and 22 in synchronization with the transmission / reception data of the transmission line 10. A transmission decoding unit 5 based on the read bit attribute and the register 3 storing the transmission demand information of the device A and the output value of the reception demand information register 4 received from the device (device A) in the device B.
The reception decoding unit 6 determines the bits to be allocated to the frame relay band, and generates a transmission FR use enable signal 101 and a reception FR use enable signal 102.

The FR use enable signals 101 and 10
2, the transmission FR clock 103 and the reception FR clock 104 are generated by converting the speed into a speed synchronized with the external FR reference clock by the speed conversion units 71 and 72. Since the output values of the demand information register change independently and synchronously in the transmission / reception direction between the device A and the device B according to the presence / absence of the demand, the transmission / reception FR clocks 103 and 104 have a one-bit unit without instantaneous interruption. A variable FR clock can be generated at a speed.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a demand assignment multiplexing apparatus according to an embodiment of the present invention; FIG. 1 is a block diagram showing a specific example of a demand assignment multiplexing apparatus according to the present invention, and FIG. 2 is an explanatory diagram of the demand assignment multiplexing apparatus. The on-demand terminal line accommodates a variable-speed frame relay terminal line and allocates the signal of the on-demand terminal line to a predetermined band of a time-division transmission line band based on a demand signal generated when the line is connected. In the demand assigning multiplexing apparatus described above, variable clock generating means 5, 71, 6, 72 for varying the transmission clock and the reception clock of the freem relay terminal line according to the generation of the demand from the on-demand terminal line are provided. A demand assigning multiplexing device, wherein the variable clock generating means 21 that stores the bit attribute of the area, the register 3 that stores the demand information on the transmission side, and the freem relay band based on the bit attribute 1 stored in the memory 21 and the demand information 2 stored in the register 3. And a speed converter 7 for generating a variable clock 103 from the first control signal 101 and the reference clock 70 generated by the decoder 5.
1 shows a demand assignment multiplexing apparatus characterized by the above configuration.

Hereinafter, the present invention will be described in more detail. Referring to FIG. 1, in a first specific example of the present invention, a device A on the transmission side includes a memory 21 for storing attributes of all bits of a band of a transmission line 10, and a register for storing transmission demand information of the device A. 3, bit attribute 1 of memory 21 and register 3
The transmission-side decoding unit 5 that generates a transmission FR use enable signal 101 synchronized with the frame relay data on the transmission side from the demand information 2 of the transmission side, and transmits the transmission FR use enable signal 101 synchronized with the internal clock to the external FR clock 70
And a speed conversion unit 71 for synchronizing with the speed.

Similarly, the device B on the receiving side includes a memory 22 for storing the attributes of all the bits of the band of the transmission line 10 and a device A.
A register 4 for storing the transmission demand information from the receiver 4 and a reception decoding unit 6 for generating a reception FR use enable signal 102 synchronized with the frame relay data on the reception side from the bit attribute 1 of the memory 22 and the demand information 2 of the register 4.
And a speed conversion unit 72 for synchronizing the reception FR use enable signal 102 synchronized with the internal clock with the external FR clock 70.

The memories 21 and 22 define three types of bit attributes: unused, demand use, and fixed use, and store bit attributes for all bits of the band used in the transmission path 10. The register 3 monitors the presence or absence of an audio demand channel call in the device A.
The PU is a transmission demand information register for setting whether or not a demand has occurred.

The register 4 is a register for storing reception demand presence / absence information transmitted from the apparatus A to the apparatus B via the transmission line 10. The transmission side decoding unit 5 is a memory 2
A bit position of a frame relay band to be used as transmission FR data is determined from 1 and an output value of the register 3, and a transmission FR use enable signal 101 synchronized with the bit position is generated.

Similarly, the receiving-side decoding unit 6 determines the bit position of the frame relay band used as the received FR data from the output values of the memory 22 and the register 4 and generates the received FR use enable signal 102 synchronized with the bit position. . The speed converters 71 and 72 convert the transmission FR use enable signal 101 and the reception FR use enable signal 102 to the reference clock frequency of the external FR at the internal clock frequency, and perform the transmission FR clock 103 and the reception FR.
Generate a clock 104.

Next, the operation of this embodiment will be described in detail with reference to FIGS. First, the operation of generating the FR clock on the transmission side will be described. In the demand assignment multiplexing apparatus of the apparatus A, when a CPU (not shown) detects a call of a demand channel, the CPU sets the transmission demand information register 3 to demand. The value of the register 3 is latched and output at regular intervals. Register 3
The output 2 of the memory 21 is decoded together with the output 1 of the memory 21 in the transmission side decoding unit 5 in a bit unit. When the bit attribute of the memory 21 is demand use and the value of the register 3 is no demand, or the bit attribute of the memory 21 is If not used, the bit becomes a condition to be allocated to the frame relay band, so the FR use enable signal 101 is turned on. Further, when the bit attribute of the memory 21 is demand use and the register 2 is demanded or fixed use, the bit is not a condition to be allocated to the frame relay band, so that the transmission FR use enable signal 101 is turned off. I do.

FIG. 2 shows an operation timing for generating the transmission FR enable signal 101 from the output of the memory 21 and the output of the register 3. In the n-th frame on the left side of FIG. Indicates a fixed data band, bits 2 and 3 indicate a demand band, and bit 4
Defines unused bandwidth. The register 3 stores demand data. Therefore, in this case, since the frame relay band can be allocated only to the band defined by bit 4, the FR use enable signal 101 is OFF in bits 1 to 3, and the FR use enable signal 101 is only in the position of bit 4. Becomes ON,
The FR use enable signal 101 shown in FIG. 2 is generated.

In the m-th frame on the right side in FIG. 2, bit 1 defines a fixed data band, bits 2 and 3 define a demand band, and bit 4 defines unused band. The register 3 stores demandless data. Therefore, in this case, bits 2-4
Since the frame relay band can be allocated only to the band defined by the above, the FR use enable signal 101 is OFF at bit 1 and the FR use enable signal 101 is ON only at the positions of bits 2 to 4, as shown in FIG. F
An R use enable signal 101 is generated.

The speed conversion section 71 writes the transmission FR use enable signal 101 with an internal clock, reads it with a reference clock of an external FR output, and synchronizes with the clock output to the external FR. At this time, the transmission FR use enable signal 101 generates the transmission FR clock 103 by taking an AND condition with the reference clock 70 of the external FR output. Therefore, the FR use enable signal 101 is turned on.
Only when the transmission FR clock 103 is output, the transmission FR use enable signal 101 changes depending on the presence / absence of the demand in the transmission side demand information register 3, whereby the number of transmission FR clocks 103 varies.

Next, the operation of the receiving-side FR clock generation will be described. The demand information of the demand assignment multiplexing device of the device A is transmitted as a synchronization frame via the control bit of the transmission line 10. The demand information is stored in the reception demand information register 4 of the own station. The register 4 is latched and output at a frame synchronization interval of the synchronization frame. The output of the register 4 is decoded bit by bit in the receiving side decoding unit 72 together with the output of the memory 22. When the bit attribute of the memory 22 is used and the demand of the register 4 is not used, or the bit attribute of the memory 22 is not used. In this case, the bit is a condition to be allocated to the frame relay band, so that the reception FR use enable signal 102 is turned on.

When the bit attribute of the memory 22 is demand use and the register 4 has demand or fixed use, the bit is not a condition to be allocated to the frame relay band. Turn off. The speed conversion unit 72 performs the reception F
The R use enable signal 102 is written with the internal clock and read with the reference clock 70 of the external FR output.
Synchronize with the clock output to R. The speed-converted reception FR use enable signal 102 generates the reception FR clock 104 by taking an AND condition with the reference clock 70 of the external FR output. The FR clock 104 changes the reception FR use enable signal 102 in synchronization with the change of the demand information in the game, so that the transmission FR clock 103 and the reception FR clock 104 can be synchronized, and the transmission and reception directions can be independently performed. An FR clock that is variable without interruption in units of one bit is generated.

Next, another embodiment of the present invention will be described. FIG. 3 shows an example of a configuration in which parameters of a demand channel (hereinafter referred to as CH) number and a route number are added to the memory 21, the memory 22, the register 3 and the register 4. In the demand assigning multiplexing apparatus of the apparatus A in which the demand call has occurred, the first decoding unit 51 identifies the route number from the output value 31 of the memory 21 on the transmitting side and the output value 32 of the register 3, and The bits having the attribute of the road are sorted.

The second decoding unit 52 identifies the demand CH number within the same route group,
When H is in a calling state, the FR use enable signal 10 at the bit position to which the demand CH is assigned
Turn off 1A. When the demand CH is not in the calling state, the transmission FR use enable signal 1 at the bit position to which the demand CH is allocated is set.
Turn on 01A.

FIG. 4 illustrates a state in which the transmission FR enable signal 101A is generated from the output of the memory 21 and the output of the register 3 in FIG. 3. In the n-th frame on the left side of FIG. Bit 1 is a fixed data band on route 1, bit 2 is a demand band on channel 1 of route 1, bit 3 is a demand band on channel 2 of route 2, and bit 4 is a band on demand 2 Is defined as unused. The register 3 stores data indicating that there is no demand for the channel 1 and data indicating that there is a demand for the channel 2. Therefore, in this case, since the frame relay band can be allocated only to the band defined by bits 2 and 4, the FR use enable signal 101 is OFF at bits 1 and 3, and FR only at the positions of bits 2 and 4. The use enable signal 101A turns ON, and the FR use enable signal 101A shown in FIG. 4 is generated.

In the m-th frame on the right side of FIG. 4, the bit attribute has not changed, but the register 3 stores data of demand for channel 1 and data of no demand for channel 2. Therefore, in this case, since the frame relay band can be allocated only to the band defined by bits 3 and 4, the FR use enable signal 101A is OFF at bits 1 and 2 and FR only at the positions of bits 3 and 4. The use enable signal 101A turns ON, and the FR use enable signal 101A shown in FIG. 4 is generated.

This transmission FR use enable signal 101A
Is converted at the external FR clock frequency to generate a FR clock multiplexed for each route, and divides it by the band of the route to obtain a transmission FR clock 10 for each route.
Generate 3A. The demand assigning multiplexing device of the device B uses the first decoding unit 61 to determine the route number from the output value 31 of the memory 22 on the receiving side and the output value 32 of the register 4 storing the demand information received from the opposite device A. Identify and sort bits having the same route attribute.

The second decoding unit 62 identifies the demand CH number within the group of the same route, and when the demand CH enters a calling state, uses the reception FR of the bit position to which the demand CH is allocated. Enable signal 10
2A is turned off. When the demand CH is not in the calling state, the reception FR use enable signal 1 at the bit position to which the demand CH is assigned is set.
Turn ON 02A.

This reception FR use enable signal 102A
Is converted at the external FR clock frequency, an FR clock multiplexed for each route is generated, and the FR clock is divided by the band of the route.
Generate 4A. As described above, in this specific example, it is possible to register a plurality of demand CHs for each route by adding the route number and the demand CH number as parameters of the memory and the register. The FR clock in the frame relay band can be changed without any interruption for each route.

[0031]

As described above, the demand assigning multiplexing apparatus and the control method thereof according to the present invention are constructed as described above. , A variable clock of an arbitrary freem relay speed can be generated in 1-bit units.

As a result, a band other than the fixed band and the voice demand band can be effectively used as the freem relay band. The reason is that the value read from the memory storing the bit attribute in synchronization with the data and the output value of the demand information register are decoded, and the demand information is transmitted and received according to the presence / absence of the demand and synchronized by transmission / reception. This is because the FR use bit is generated.

Further, according to the present invention, the demand information register is provided independently for transmission and reception, and the output of the transmission / reception demand information register is transmitted to the opposing device by a synchronous frame via a transmission line, so that the transmission direction and the reception direction can be determined. Register output values can be synchronized. As a result, the change of the freem relay band and the variable FR
By synchronizing the change of the clock in the transmission / reception direction, the frame relay band can be changed without instantaneous interruption.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first specific example of a demand assignment multiplexer according to the present invention.

FIG. 2 is a diagram for explaining a first specific example of the present invention.

FIG. 3 is a block diagram showing a second specific example of the present invention.

FIG. 4 is a diagram for explaining a second specific example of the present invention.

[Explanation of symbols]

 1 bit attribute 2 demand information 3 transmission side demand information register 4 reception side demand information register 5 transmission side decoding unit 6 reception side decoding unit 10 transmission line 21, 22 bit attribute storage memory 71, 72 speed conversion unit 101 transmission FR use enable signal 102 Receive FR use enable signal 103 Transmit FR clock 104 Receive FR clock

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-11-186980 (JP, A) JP-A-11-298428 (JP, A) JP-A-9-321807 (JP, A) JP-A-4- 45625 (JP, A) JP-A-1-18843 (JP, A) JP-A-9-294140 (JP, A) JP-A-59-204338 (JP, A) 1998 IEICE General Conference B-8 −78, March 6, 1998 (58) Fields investigated (Int. Cl. ⁷ , DB name) H04L 12/56 H04L 12/20 H04J 3/00-3/17 H04L ⁷ /00-7/08

Claims (1)

(57) [Claims] An on-demand terminal line that connects only during communication and a frame relay terminal line with a variable communication speed are accommodated, and the on-demand terminal line is connected to the on-demand terminal based on a demand signal generated when the line is connected. In a control method of a demand assigning multiplexing apparatus, wherein a signal of a line is allocated to a predetermined band of a time-division transmission line band, a bit attribute of all bands of the transmission line and transmission demand information are stored in a predetermined memory of the own station. A first step of storing the bit attribute of the entire band of the transmission path and transmission demand information to the other station; and a possibility of allocating a frame relay band based on the data in the memory area. A third step of outputting a first control signal indicating the following, and ANDing the first control signal and the FR reference clock, The method of demand assign multiplexer which comprises a fourth step of generating a variable clock, a.