JPS6218895A - Multiple information line concentration system - Google Patents

Abstract

PURPOSE:To perform high-speed operation on pipeline basis by providing individual processing circuits corresponding to channels of respective subscriber lines, connecting those individual circuits in series,and distributing and connecting highway information to individual circuits. CONSTITUTION:Each multiprocessing part 110 in a multiplexing part 34 is constituted by connecting individual parts 111 in series and multiprocessing parts 110 corresponding to subscriber lines are also connected to respective individual parts 111 so that time slots on a highway are distributed. A time slot number on the fast highway to be multiplexed is used as an address to write a subscriber line number LEN, a channel number CN on a subscriber line,and a flag '0' to be multiplexed on the time slot in a holding memory 102 from the control system of an exchange. A common part 100 circulates the contents of the holding memory, frame by frame, and sends out frame information and a clock to the individual parts 111. The individual part 11 retimes said information with a received clock and compares a subscriber number LEN and a channel number CN with X(LEN+CN) that the individual part has.

Description

[Detailed Description of the Invention] [Summary] In a line concentrator accommodating subscriber lines whose information speed is variable in accordance with the service, individual sections provided corresponding to information channels of the subscriber lines are distributed and connected in series. This is a line concentration method in which a multiplexing/demultiplexing means for multiplexing or demultiplexing is configured, and time slots on the independent way are allocated according to the required information speed.

[Industrial application field]

The present invention relates to subscriber line concentrators, and more particularly to a line concentrator system that makes it possible to make equipment economical by making multiple use of highways and concentrators in response to changing information speeds corresponding to services.

[Conventional technology]

Conventional line concentrators target a single information rate, and there is no service that allows the rate to be changed for each call or during communication. Additionally, in the demultiplexing circuit, information is universally multiplexed at highway speeds in the subscriber circuit package and multiplexed using wired-or logic to a fixed time slot location on the bus on the back panel of the device. As the speed increases, the influence of wiring length, fan-in delay due to wired OR, reflection distortion, etc. becomes significant, and the operation speed is limited. For example, even if ECL, which is the highest current device, is used, it is approximately 30M
The speed is about b/s.

However, with the advent of a highly information-oriented society, there is an increasing need for a broadband exchange that can uniformly handle a wide range of speeds, such as from 384 Kb/s to 32 Mb/s, for ultra-high-speed data and videos.

[Problem that the invention seeks to solve]

With such exchanges, depending on the terminals and services used,
Furthermore, even for the same subscriber, it is required to be able to vary the information rate used for each call and even during communication. In addition, in order to enable composite communication and simultaneous communication, multiple information channels are prepared on the subscriber line, but in order to satisfy all of these communications on the subscriber line and the highway in the exchange, multiple information channels must be provided to accommodate the terminal speed. It may be possible to provide capacity for the channels, but this would result in faster highway speeds, lower multiplicity, and an increase in the number of highways.

However, considering that the number of simultaneous connections in a typical household is at most four channels, increasing the speed of highways and increasing the number of highways is uneconomical.

Furthermore, the conventional method of dividing and preparing highways according to speed requires concentrating switches to correspond to speed, which is uneconomical.

[Means for solving problems]

The present invention provides a line concentrator for concentrating subscriber lines, in which individual processing circuits are provided as demultiplexing circuits for each channel of each subscriber line, and these individual circuits are connected in series to transmit highway information to each individual line. By making a distribution connection to the circuit of
The pipeline format enables high-speed operation.

By allocating the highway time slots required at the time of service request, the usage rate of the highway can be increased and economic line concentration can be achieved.

FIG. 8 shows an example of a system configuration in which this invention is commonly used. In the figure, the exchange main body includes an exchange switch (S
W) 1 and central control unit (CC) 2, etc.
On the subscriber terminal side, a network terminal (NT) 5 is connected to a subscriber telephone 9, a data terminal 7, an image terminal 8, etc.

The subscriber line between the exchange main body side and the network termination device 5 is digitally transmitted and has a plurality of channels, and is demultiplexed by the line concentrator 6.

The line concentrator 6 includes a subscriber circuit 4 provided for each subscriber line, a line concentrator 3 that interfaces with the highway on the exchange side, and the like.

The present invention relates to this line concentrator 6, and FIG. 1 shows a basic configuration diagram of the line concentrator 6 of the present invention. In the figure, a subscriber circuit (st, c > 4) provided for the subscriber line to interface with the subscriber line side, a multiplexing unit that multiplexes information on multiple subscriber lines and transfers it to the high-speed highway H- (MUX) 34, Separation unit 35 that distributes information from Expressway H- to multiple subscriber lines, Expressway I
Line concentrator (LC) that performs switching and narrowing down between the IW and the up and down highways 37.38 on the exchange side
32, 33, and a processor (CP[I) 31 that controls the entire line concentrator including the individual circuit controls described above.

The demultiplexing means 34.35 determines the required number of time slots of the high-speed highway in the concentrator according to the information rate on the subscriber line, supplements the empty time slots, and converts the information on the subscriber line to the information on the subscriber line. Multiplexing and demultiplexing between subscriber lines and high-speed highways by switching to time slots. The line concentrator/separator 32.33 accommodates a plurality of high-speed highways, and draws information from the multiplex/separator 34.35 to the exchange using a time division switch.

In the multiplexing unit 34 of the demultiplexing means 34 and 35 that multiplexes information on the subscriber line onto the express highway, the details will become clear in the explanation from FIG. A common section comprising a holding memory 102 for storing a subscriber number LEN for identifying a subscriber line to be multiplexed to the time slot and an information channel number CN on each subscriber line as contents of the address corresponding to the time slot number of the time slot. 1
00, and an individual section 111 provided corresponding to the information channel, and information lines for the subscriber number LEN and the channel number CN, which are read out cyclically in frame units from the common section 100, are connected in series to each individual section 111. Distribution is connected.

In each individual unit 111, the subscriber number LEN that the individual unit has
and channel number CN, and the subscriber number LEN and channel number CN received from the common unit side are compared in the comparing unit, and if they match, the common unit 100 is sent via the selection circuit 204.
The subscriber information from the subscriber line is selected instead of the subscriber line correspondence or the channel number, and is sent to the next individual section or the exchange side.

On the other hand, in the demultiplexing section 35 for demultiplexing information to the subscriber line in the demultiplexing means 34 and 35, as shown in FIG. 6 and FIG. The section 316 has an interface section 400 that stores the time slot number to be separated on the high-speed highway.

Further, the common section 300 distributes and connects identification information lines for the high-speed highway and frames synchronized thereto to each individual section in series. Each individual unit 316 counts the time slot number based on the frame information and compares it with the value stored in the interface unit 400. If they match, the information about the high-speed highway is transferred to the subscriber line side. It's crowded.

In this way, a multi-information line concentrator is obtained which captures and concentrates the time slots of the high-speed highway in response to changes in the information rate for each call or during communication, in accordance with the information rate.

[Effect]

Below, as an example, the information speed is 32 Mb/s and 8 Mb/s.
The operation will be explained for the case. Generally, the information transmission rate bearers of multiple terminals are grouped in a 1:N relationship, and the present invention is not limited to this example. put.

Below the basic configuration of FIG. 1, FIG. 2 shows an example of the format on the subscriber line and highway H-. In the figure, each subscriber line (SLI, SLO) has two channels (0CHH, ICHH) of 32 Mb/s and four channels (OCI (L, ,
ICHI,.

2CHL, 3CHL) are used in multiple ways.

For example, consider a case where a 32 Mb/s call occurs on subscriber line SLO and an 8 Mb/s call occurs on subscriber line SLI.

Normally, the in-home equipment and the line concentrator have a signal channel (not shown) for switching control, separate from the information channel. Using this signal channel, an information rate notification signal is sent from the terminal to the signal processing device (SIG) 36 via the subscriber circuit SLC.
The control system analyzes the empty channel on the subscriber line (channel OCH in SLO in Figure 2) and notifies the control system.
Instructs the terminal to communicate using HlSLI (0CHL).

On the other hand, the control system captures the time slots on Highway IIW, and uses 1 time slot for 8 Mb/s calls and 4 times the time slot for 32 Mb/s calls. The demultiplexing means 34 and 35 are instructed to capture and multiplex it onto the highway HW shown in FIG. The line concentration/separation units 32 and 33 perform line concentration using ordinary highway switches.

As is clear from the above explanation, in the highway HW, time slots are used only when a call occurs;
Since one time slot can be shared by multiple subscribers, it is expected that the efficiency of highway usage will be improved, and therefore, the number of highways can be reduced.
can be made more economical.

〔Example〕

Hereinafter, the configuration of each part of the line concentrator of the present invention will be explained in more detail.

3 is a block diagram of the multiplexing section 34 in the multiplexing/demultiplexing means shown in FIG. 1, FIG. 4 is a block diagram of the individual sections in the multiplexing section, and FIG. 5 is an explanation explaining the outline of the operation of the multiplexing section. It is a diagram.

In FIG. 3, the multiplexing unit 34 includes a common unit 100 and a multiplexing unit (LENO-LEN N-1) 110 corresponding to each subscriber line (SLC#O to SLC#N-1). The common section 100 includes an area 105 for storing subscriber numbers LEN and channel numbers CN to be sent to each multiplexing processing section 110 corresponding to highway time slots, and a flag (Flag) indicating the presence or absence of the information (LEN, CN).
The holding memo 1J102 includes an area 104 for storing. Subscriber number LEN read from this holding memory
and channel number CN are frame information for frame synchronization.
(FP) 106 and is input to the flip-flop 103, and sent to the highway 113 by a predetermined clock (CLK) 107. Note that the holding memory is read out in a time-division manner.

The multiprocessing unit 110 processes subscriber lines (SLC#O to SLC#
N-1) Individual sections 112 for the number of channels for each 114
The multiprocessing section 110 in this example has four individual sections C to (2) corresponding to four channels.

Here, what should be noted in the present invention is that each multiplexing section 110 in this multiplexing section 34 is configured by connecting each individual section 111 in series, and a multiplexing section corresponding to each subscriber line 110
Also, the connection is such that the highway time slots are distributed to each individual section 111. Each individual part 1
11 are connected in a so-called skewer shape, and each individual section is processed simultaneously and in parallel in a pipeline control format.

FIG. 4 shows the detailed configuration of this individual section, which includes a flip-flop circuit 200 that holds input information from the common section 100 at the previous stage or from other individual sections, and a flip-flop circuit 200 that holds input information from the common section 100 at the previous stage or the input information from other individual sections or the exchange side. Between the flip-flop circuit 203 that holds output information, the information X (own subscriber number LEN + own channel number) assigned within the own circuit is compared with the subscriber number LEN and channel number CN from the previous stage. Comparator (COM) 201, front LEN, CN information or subscriber information 113 (112) and buffer 2 in its own individual section.
05, a selection circuit (SEL) 204 for selecting the subscriber information 114 inputted through the input terminal 05, and a gate circuit 206 for controlling the punching/crossing of the output flip-flop 203.

In addition, the control information line (CLK107.FP106.FIag104) that interfaces the previous stage and the next stage is the fourth
The same reference numerals as shown in the figure indicate the same parts.

Therefore, the multiplexing method of the present invention will be explained with reference to FIG.

To simplify the explanation, FIG. 5 shows a case where the multiplicity of the high-speed highway is 4, in which only two stages of each individual section are arranged horizontally, and the highway information G is transmitted in series from the left side to the right side. In the vertical and downward directions, changes in information are shown over time.

Now, as the input IN shown in the upper left, frame information FP,
Flag Flag, subscriber number and channel number LEN,
It is assumed that CN is input together with clock CL, and of the two stages of individual sections 111, X in the previous stage is "0" and × in the third stage is "1".
”.

Therefore, from the control system of the exchange, the time slot number of the high-speed highway to be multiplexed is set as an address to the holding memory 102, and the subscriber line number LEN, channel number CN on the subscriber line, and flag to be multiplexed in that time slot are sent to the holding memory 102. Write as “0”. The common section 100 circulates the contents of the holding memory frame by frame, and sends frame information and a clock to the individual section 111.

The individual unit 111 retimes the above information using the reception clock, compares the received subscriber line number LEN and channel number CN with its own X (LEN + CN),
If they match, and the flag is 0'', LEN, CI
is replaced using subscriber information and a selector, and at the same time, the flag is set to "1" to prohibit subsequent replacement in the individual section, and the output flip-flop FF203 retimes and sends out. That is, this flag is locked by writing one piece of information so that it will not be used twice in other than the designated individual section during a time slot on the highway.

Enter the input information in the order of FP, Flag, LEN+CN (10
When 1) is input to the first stage individual section (X=O), 1,
Since EN+CN do not match, the input information (101) in the time slot at that time is transmitted unchanged to the next stage's individual section.When the input information (000) is input next, the previous stage where LEN+CN matches. The individual unit (X=O) knows that it is designated. During this time, the next individual unit (X=1) receives the previous input information (101), so it similarly A comparison check of LEN+CN will be performed.

In the individual section (X=O), the subscriber information DO of the own circuit is input into a predetermined time slot by switching the selection circuit 204, and in the individual section (X=1), the subscriber information 010 of the own circuit is input into the selection circuit 204. input to a predetermined time slot by switching. Note that the flag Flag is stored in each individual section (X=O, X=
“1” is set in step 1).

The above operations are performed simultaneously in multiple individual units, and the information on each subscriber line is multiplexed according to the number of allocated time slots, and information is sent out as shown by the output OUT in the lower right corner of Figure 5. be exposed.

On the other hand, FIG. 6 shows the configuration of the demultiplexing section of the demultiplexing circuit, and FIG. 7 shows the configuration of the individual sections corresponding to channels on each subscriber line in the demultiplexing section.

In FIG. 6, the separation unit 35 includes a common unit 300 and a plurality of processing units (LHNO to LEN (N-1
)) 310, and an individual section 316 of the processing section 310.
It is similar to the multiplexing section 34 in that 1 to 2 are provided corresponding to subscriber lines (SLC#O to SLC#N-1) and corresponding to channels.

The common section 300 is located on the express highway -30 from the exchange side.
7 and the control bus 306 are received by the interface units 302 and 301, and the control signal is sent to each individual unit 31 of each processing unit 310 via the control line 313.
6 is sent out. Furthermore, the information on the highway is launched by the interface unit 302 to the Frisobfloop 301 using frame information 304 and clock information 305, and sent out via the interface unit 303 on the individual unit side.

That is, the control signal from the control system on the exchange side is transmitted to the control bus 3.
06 to control the bus interface of the individual section 316. The control system instructs the subscriber line number LEN and channel number CN to separate the time slot of a certain high-speed highway, and specifies the time slot of the high-speed highway to be separated into the buffer in the bus interface of the individual unit having the corresponding LEN and CN. Write the slot number.

Each individual section is connected to the highway 314 in series, similar to a multiplexing section.
Or, the information of 312 is connected so that it is distributed, and each individual section processes different time slots simultaneously in the same time period (time slot processing time period).

In each individual section, the information on the highway is extracted from information that matches the own subscriber number and channel number, and the own subscriber line 3
15, separation processing from the highway is performed.

FIG. 7 shows the detailed configuration of the individual parts within this separating section 35. As shown in FIG. In the figure, each individual section has a clock (CLK)
305 , receives the information on the fast highway 314 (312) along with frame information (FP) 304 and is retimed by a flip-flop (FFO) 402, while counting the time slot number on the fast highway by a counter 401. The comparator 403 compares the time slot number to be separated in the bus interface 400 with the time slot number from the counter, and if they match, stores the contents of the high-speed highway in the buffer 404 and sends it to the own subscriber circuit SLC. .

On the other hand, the high-speed highway 311 (312) and frame information iFP are retimed by a flip-flop (FFI) 405 and sent to the next individual section along with the clock CLK.

〔effect〕

According to the present invention, the individual parts are connected in series, information is distributed to each individual part, and each individual part is configured to independently select information at each timing, and the control is performed by pipeline control. The connection between the individual parts in the demultiplexing circuit is 1:1, and compared to the conventional helical connection type, the reduction in operating speed due to fan-in and wiring length is reduced. This enables high-speed operation.

[Brief explanation of the drawing]

FIG. 1 is a basic configuration diagram of the line concentrator of the present invention, and FIG.
A diagram showing examples of formats on subscriber lines and highways below the basic configuration of the figure, Figure 3 is a configuration diagram of the multiplexing section in the demultiplexing circuit, and Figure 4 is a configuration diagram of the individual parts in the multiplexing section. ,
FIG. 5 is an explanatory diagram explaining the outline of the operation of the multiplexing section, FIG. 6 is a configuration diagram of the demultiplexing section of the demultiplexing circuit, and FIG. 7 is the configuration of the individual sections corresponding to channels on each subscriber line in the demultiplexing section. Figure, 8th
The figure is a diagram showing an example of a system configuration to which the present invention is applied. In the figure, 1 is an exchange switch (link), 2 is a central control unit (CC), 3 is a concentrator, 4 is a subscriber circuit, 5 is a network terminal (NT), 6 is a concentrator, 7 is a data terminal, 8 is an image terminal, 9 is a subscriber telephone, 34 is a multiplexing section (multiple circuit), and 35 is a separation circuit. It is. 3432 Basic configuration diagram of the present invention 1. figure

Claims (3)

[Claims] (1) A subscriber that accommodates multiple digital subscriber lines with variable information speeds depending on the service provided to subscribers, concentrates and multiplexes information from the multiple subscribers, and connects to the exchange (1) A line concentrator (6) determines the required number of high-speed highway time slots in the concentrator according to the information rate on the subscriber line, supplements empty time slots, and adds information on the subscriber line to the information on the subscriber line. demultiplexing means (34, 35) for demultiplexing between the subscriber line and the high-speed highway by switching to the selected time slot;
Concentrating and separating means (3
2, 33), and for changes in information speed for each call or during communication,
A multiple information line concentration method characterized by capturing and concentrating time slots of a high-speed highway according to the information speed. (2) A multiplexing unit (34) that multiplexes the information on the subscriber line of the multiplexing and demultiplexing means (34, 35) onto the high-speed highway.
stores the subscriber number (LEN) that identifies the subscriber line to be multiplexed to the time slot and the information channel number (CN) on each subscriber line as the contents of the address corresponding to the time slot number on the high-speed highway. Retention memory (10
2); and an individual section (111) provided for each of the information channels, the information on the subscriber number and the channel number being read out cyclically in frame units from the common section. The lines are distributed and connected in series to each individual section, and each individual section compares the subscriber number and channel number of its own individual section with the subscriber number and channel number received from the common section in a comparing section. If they match, the selection circuit (204) selects the subscriber information from the subscriber line instead of the subscriber number or the channel number from the common section, and selects the subscriber information from the subscriber line in place of the subscriber number or channel number from the common section, and sends the information to the next individual section or the exchange. The multi-dimensional information concentrating system according to claim (1), characterized in that the multi-dimensional information is transmitted to the side. (3) The demultiplexing unit (35) that separates information from the highway to the subscriber line in the demultiplexing means (34, 35) includes an individual unit (316) provided for each information channel on the subscriber line.
) is equipped with an interface section (400) for storing time slot numbers to be separated on the express highway, and information lines for identifying the express highway and frames synchronized therewith are distributed and connected to each individual section in series, Each individual unit counts the time slot number based on the frame information, compares it with the value stored in the interface unit, and if they match, takes in the information from the high-speed highway to the subscriber line side. A multi-dimensional information concentrating system according to claim (1), characterized in that: