JPH01132256A - Remote multiplexing device - Google Patents

Abstract

PURPOSE:To enable a large quantity subscriber even existing in the distance of 10 and several Km to transmit data efficiently by providing a remote multiplexing device to multiplex the data to be inputted through each interface. CONSTITUTION:The data of the data terminal 1 of 30 subscriptions under control the remote multiplexing device 100 is multiplex-processed by a multiplexing part 300, and is converted into an optical signal by an electrooptic converting part 400, and is transmitted to a terminal equipment(MSLTE) 500 through an optical subscribers line (e) of 6Mbps. A first buffering means for an up line and a second buffering means for a down line are provided in an interface part 200(i) in a similar way, and as considering a first buffering means and a second buffering means as a subscriber line between a subscriber terminal equipment and an inter-office terminal, various kinds of wrap tests are performed. Thus, a function similar to a case that the metallic wire of 2W is used for the subscriber line can be obtained, and in addition, the transmission efficiency of the data from the large subscriber extending over a wider range is improved.

Description

[Detailed Description of the Invention] [(Already required)] Regarding a remote multiplexing device that multiplexes and transmits data from a large subscriber to a plurality of terminal devices in remote locations without transmission loss, The purpose is to provide a remote multiplexing device for efficient data transmission processing for subscribers, and it returns data to the terminal device side and the multiplexing device side with predetermined signal settings, and also transmits data from the terminal device. An interface section is provided for each terminal device that detects data and a connection request from the switching center side and sends a response signal to the switching center side, and the data input via each interface section. and a multiplexing device for multiplexing.

[Industrial application field]

The present invention relates to a remote multiplexing device that multiplexes and transmits data from large subscribers of a plurality of terminal devices located in remote locations without transmission loss.

In a data communication system that multiplexes and transmits data from multiple media such as telephone terminals, data terminals, facsimile terminals, etc., subscriber terminal equipment and subscriber terminal equipment and multiplexing equipment that interface with these multiple media are used. It is equipped with an in-office terminal device that interfaces with subscriber lines between data transmission equipment such as.

Moreover, between this subscriber terminal equipment and the in-office terminal equipment,
The conventional method is to configure a system by connecting with a two-wire metallic line.

However, with the advanced use of data transmission systems, there was a demand for a method that used optical cables instead of two-wire metallic lines to multiplex and transmit a large number of terminals such as telephone terminals, data terminals, and facsimile terminals at once. has been done.

In such cases, a data transmission system is required that has both the functions of a subscriber terminal device and an in-office terminal device, and also has the functions that have been available in the past, such as a line loopback function.

[Conventional technology]

Figure 5 is a block diagram explaining the conventional example, Figure 6 is a diagram explaining the system configuration in the conventional example, and Figure 7 is 1-43.
A diagram explaining the 0 frame format, Figure 8 is 2Mb
Diagram explaining the ps highway data format, No. 9
The figures each show a diagram illustrating how a communication ready state signal is retained in a conventional example.

The conventional data transmission system shown in FIG. 6 consists of a data terminal 1 consisting of multiple media such as a telephone terminal, a data terminal, and a facsimile terminal, and a 1-430 interface (general-purpose interface).
a) A subscriber terminal unit (hereinafter referred to as OSU) 2 that is connected to the data terminal 1 through a) and connects the data terminal 1 to the data network, and a 2W metallic line (capable of transmitting data at a speed of up to 320 Kbps). Line (BL and multiplexer 3
2 Mbps Highway (hereinafter referred to as 2 MHW) (C), and receives data transmitted via the subscriber line (b).

Multiplexes data transmitted via in-office terminal units (hereinafter referred to as OCUs) 31 (1) to 31 (60) having level conversion functions, waveform equalization functions, etc. and 0CUs 31 (1) to 31 (60). multiplexing unit (hereinafter referred to as MIX)
) 32, an interface (INF) unit 33 that interfaces the MUX 32 and the 4MHW(d), and an exchange that exchanges data between the data terminals 1 with the data terminal 1 as a subscriber. The system is comprised of 4.

Note that a plurality of terminal equipments 3 (in this example, a unit having 60 subscriber lines) are connected to the exchange 4.

Also, the code 34 in the first diagram is 0C1131(1)y31(6
0) (in FIG. 5, it is represented by 0CU31(i)) shows a clock generation unit that generates a clock for internal processing of the device based on data received and processed.

Furthermore, the 2W metallic circuit vA(b) is normally
It is possible to use a data terminal 1 within several kilometers from the subscriber terminal.

Furthermore, as shown in FIG. 7, one frame of the T-430 interface (a) is 48 bits/250 μs, and B1. Data bits of 64 Kbps consisting of B2 channels, control signals indicated by D, frame bits indicated by F, etc. are included and transmitted.

FIG. 5 shows the processing situation when conducting a return test that is necessary for maintenance and inspection of the data transmission system configured as described above.

That is, the loop 2A loops from the terminal station bag R3 to the 1-430 interface (a) of the DSU 2 and returns to test the function therebetween.

Loop 2 that creates a loop by looping within the logic circuit inside DSU2 (folding back of data bits consisting of Bl, B2.D)
, 0CU31(i) subscriber line (loop IA for performing a return test on the bl side).

Loop ID that creates a loop by turning back inside the logic circuit of 0CU31(i) (turning back B1.B2), a loop from the 1-430 interface (a) side, and a loop that creates a loop by turning back inside the logic circuit inside DSU2 C(81,B2
Function tests are performed by instructing the creation of return loops such as return loops from a control device (not shown).

Figure 7 shows the frame format of the F-430 interface (a), in which one frame consists of frame bits F
to the next frame bit F, and this period consists of 64 Kbps data bits mainly consisting of B1 and B2 channels.

Note that FIG. 7(A) shows a frame format for transmission from the DSU 2 to the data terminal 1, and FIG. 7(B) shows a frame format for transmission from the data terminal 1 to the DSU 2.

Further, each symbol in the figure is as shown at the bottom of the figure.

Note that DC balance is defined as MHW (C
) has a data format as shown in FIG.

That is, as shown in FIG. 8(A), there are 32 (256
bit/125μs) and 2 timesloft (
16 bits) for the downlink (Fig. 8(B), (C)) shown in Fig. 8 (B) to (E), and for the uplink (
Figure 8(D).

(E)) data is transmitted.

The contents of the control bit C0IJ and the status bit 5TIJ are as shown in FIG. In this case, the loop ID indicates that channel 81 is being tested.

DSU2 shown in Fig. 6 and its corresponding 0CU31 (
In order to transfer data to and from i), it is usually necessary for both parties to recognize that their internal states are in a communicable state and that the other party is in a communicable state.

Therefore, in order to display this communication enabled state, as shown in FIG. 9, 0CU31(i) sends a specific pattern signal (this is called a training pattern) to
When this is detected, the DSU 2 also displays a specific pattern signal (this is called a reverse training pattern) on OCυ3Hi), thereby starting mutual data transmission.

That is, the training pattern from 0CU31 (i) is a signal instructing the DSU2 to set the communicable state, and the reverse training pattern from the DSU2 is a signal responding that the communicable state is set. .

[Problem that the invention seeks to solve]

When performing data transmission with the above system configuration, when the number of data terminals 1 increases, DSU2 and 0CU31 (
i) will be increased, and along with this, DSU2 and 0C will be increased.
Between U31(i) (7) 2 W/ 5”) y’)
The number of times vA(b)(7) becomes enormous.

In addition, when connecting DSU 2 and 0 CU 31 (i) with a 2W metallic line (BL), when the distance between the terminals is within several kilometers and when processing a large number of subscribers, data transmission efficiency is poor and costs increase. There are problems such as the following.' An object of the present invention is to provide a remote multiplexing device for processing data transmission efficiently for data terminals and large subscribers in remote locations.

[Means for solving problems]

FIG. 1 shows a block diagram illustrating the invention in detail.

100 in the block diagram of the principle of the present invention shown in FIG.
DSU2 and 0CU31(i) explained in FIG.
200(i) in the remote multiplexer 100 of the present invention has the functions of returning data to the terminal device side and the multiplexing device 300 side by setting a predetermined signal. , 300 is an interface unit provided for each terminal device that detects data transmitted from the terminal device, detects a connection request from the switching center side, and sends a response signal to the switching center side; This is a multiplexing device that multiplexes data input through each interface section 200(i), and providing a remote multiplexing bag W100 equipped with these is a means for solving this problem.

[For production]

1-430 is a general-purpose interface with data terminals, etc.
A first interface means corresponding to an interface and a second ink interface means for interfacing with a 2MHW forming a 2Mbps highway are incorporated into the interface section 200(i), and the system is installed within a range of more than ten kilometers. The multiplexer 300 multiplexes transmission data from a plurality of data terminals, etc., and transmits the multiplexed data to the switching center.

Moreover, the buffer means of the up line brush 1 and the buffer means of the down line brush 2 are provided in the interface section 200(i) between the first interface means and the second interface means, and this The first buffer means and the second buffer means are DSU2 and 0C explained in FIG.
Various loopback tests will be conducted using the subscriber line between U31 (i).

Furthermore, an indication that each functional block in the interface unit 200(i) provided for each of these terminal devices is in a communicable state is displayed when data transmitted from a data terminal, etc. is detected or on the switching center side. When detecting a bit that instructs to set the communication enabled state from , it is set in the buffer 1 means of the uplink brush 1 through the communication enabled state detection/setting means, and the data is sent to the exchange side by transmitting it to the exchange side. By configuring it to start transmitting
It becomes possible to efficiently transmit data even to large subscribers who are located in remote areas of more than 10 Kn+.

〔Example〕

The gist of the present invention will be specifically explained below with reference to embodiments shown in FIGS. 1 to 4.

FIG. 2 is a diagram explaining the configuration of the interface unit in the embodiment of the present invention, FIG. 3 is a diagram explaining the system configuration in the embodiment of the present invention, and FIG. 4 is the situation of the return test in the embodiment of the present invention. Figures explaining each are shown. Note that the same reference numerals indicate the same objects throughout the figures.

The present embodiment shown in FIG.
The signal is multiplexed at the electrical/optical converter (hereinafter referred to as OLT) 400, converted into an optical signal, and transmitted to the terminal equipment (MSLTE) 500 via the 6 Mbps optical subscriber line (e). Show the configuration.

The terminal equipment (MSLTE) 500 is an OL corresponding to the two remote multiplexers 100? 510.520 and 0LT5
10, a multiplexing unit (hereinafter referred to as MtlX) 530 that further multiplexes the multiplexed data converted into electrical signals in 520;
Three control units 500a including an interface unit (INF) 540 that serves as an interface between the MtlX 530 and the exchange 4 (controls the 60 access interfaces)
~500c (controls an interface of 180 subscriptions).

In addition, the interface unit in the remote multiplexer 100 (
i-IP-u) 200 is a general-purpose 1
A first interface circuit (hereinafter referred to as 1-iP) 21O interfaces with the -430 interface (a), and a second interface circuit (hereinafter referred to as 2M-iF) interfaces with the 2M) IW (c). ) 22o,
i-1F 210 and 2M-1F 220, and a first data buffer unit (hereinafter referred to as B-BOFF) 230 located on the downlink side;
It is disposed between 1F 210 and 2M-1F 220, and includes a second data buffer section (hereinafter referred to as F-BOFF) 240 disposed on the uplink side.

In addition, (7) B-BUFF230. F-BUFF24
0 is composed of a plurality of flip-flop circuits, etc., and is assumed to be Φ.

In the data transmission system of this embodiment described above, when forming a return loop similar to that explained in FIG.
As shown in FIG. 4 (A) to (D), B-BUFF2
30. A return loop is created using the P-BUFF 240 as a subscriber line.

That is, FIG. 4(A) shows the loop ID B1. This is a case of forming a fold of B2 channel, and CO, □ shown in Fig. 8
, 2M from the output side of B-BUFF230 at C0zs
-Create a loop (the part shown by the solid line, the same applies hereafter) to the output side of 1F220.

Also, FIG. 4(B) shows loop IA or B1. This is a case where folding of B2 and D channels is formed, and CO21, C0z4. Cots, COz & Nite B
-Create a loop from the output side of BUFF 230 to the input side of F-BUFF 240.

FIG. 4(C) shows the case where the 81.82 channel of loop C is folded, and the CO31°CO+ shown in FIG.
B-BUFF2 from the output side of F-BUFF240 at
Create a loop that loops back to the input side of 30.

Furthermore, FIG. 4(D) shows the case where a return to loop 2 is formed, and at CO□ shown in FIG. 8, i -1F210
1-430 interface (Create a loop that performs a loopback device test on the AL side.

Note that the remote multiplexer 100 is a terminal equipment (MSLTE)
When displaying the communicable state for 500, the
The state shown in G) is sent by setting the DC loop contact bit of ST11.

That is, the remote multiplexer 100 is set to a communicable state by setting the line connect LC (shown in FIG. 8(F)) of the control bit C01 from the terminal equipment (MSLTE) 500 side. Instruct the remote multiplexer 100.

When the remote multiplexing device 100 detects this control pin Co, in the communication enable state detection/setting section 250, the F-BU
By sending the status bit STz to the FF 240 and transmitting it to the uplink together with other status bits, the communicable status of the remote multiplexer 100 is determined as the terminal station bag f (MSL
TE) Display on the 500 side.

By processing as described above, a system that has the same function as using a 2W metallic line as the subscriber line (b), but improves the efficiency of data transmission from large subscribers over a wider area, has been put into practical use. It becomes possible.

〔Effect of the invention〕

According to the present invention as described above, it has the same function as when using a 2W metallic wire, and moreover, it has the same function as when using a 2W metallic wire.
It is also possible to efficiently transmit data from large subscribers located in remote locations of m.

[Brief explanation of the drawing]

FIG. 1 is a block diagram explaining the present invention in detail, FIG. 2 is a diagram explaining the configuration of an interface unit in an embodiment of the present invention, FIG. 3 is a diagram explaining the system configuration in an embodiment of the present invention, FIG. 4 is a diagram explaining the situation of the loop test in the embodiment of the present invention, FIG. 5 is a block diagram explaining the conventional example, FIG. 6 is a diagram explaining the system configuration in the conventional example, and FIG. 7 is a diagram explaining the system configuration in the conventional example. -430 frame format, FIG. 8 is a diagram explaining the 2 Mbps highway data format, and FIG. 9 is a diagram explaining the legacy of the communicable state signal in the conventional example. In the figure, 1 is a data terminal, 2 is a DSU, 3.500 is a terminal device, 3H1) to 31 (60) are OCUs, 32
．． 30 sail 530 is MIX. 33.540 is an interface unit (INF), 4 is a switch, 100 is a remote multiplexer, 200 (1)
~200 (30), 200 (i) is the interface part, 400.510, 520 is OLT, 21
0 is 1-iF, 220 is 2M-1F, 2
30 is B-BUFF, 240 is F-BUFF. 250 is a communicable state detection/setting unit, 500a to 50
0c is the control unit 1, -----, ---,, -,, -, --------, -,
,−,,,−−−−−−−−−,−,−−−,−−−,
−−−,−,,−,,,,−−−−−−−,,,,−
, -------, -f-1,00 Fig. 1 A block diagram explaining the present invention in detail Fig. 1 A diagram explaining the configuration of the interface unit in the embodiment of the present invention Fig. 2 Communication enable state signal in the conventional example Diagram 9 explaining the inheritance of

Claims (1)

[Scope of Claims] 1) A remote multiplexing device (100) that multiplexes data from a plurality of terminal devices located in remote locations and transmits the data to a switching center, which multiplexes data on the terminal device side and multiplexes data by setting a predetermined signal. conversion equipment (300
) side, detects data transmitted from the terminal device, detects a connection request from the switching center side, and sends a response signal to the switching center side. interface section (200(i)
); and a multiplexing device (300) for multiplexing data input via each interface unit (200(i)). 2) The interface unit (200(i)) includes first interface means that interfaces with the terminal device, and the first interface means and the multiplexer (30).
0); first/second buffer means for uplink and downlink between the first interface means and the second interface means; communicable state detection/setting means for detecting a connectable display bit displayed on an uplink and a downlink and setting a connectable display bit for returning to the uplink in the first buffer means; A remote multiplexing device according to claim 1.