JPH0472930A - Subscriber system multiplex system - Google Patents

Abstract

PURPOSE:To easily multiplex signals of two different interface lines with one device by providing a conversion circuit reconstituting format constitution for a basic interface line and a conversion circuit reconstituting format constitution for an analog subscriber line to the system. CONSTITUTION:A remote multiplexer 5 is provided with plural basic interface conversion circuits 6..., plural analog subscriber conversion circuits 7... and one TDHW demultiplexer multiplexer circuit 8. The conversion circuit 6 collects two 8-bit B channels of basic interface line use format constitution into one channel and reconstitutes the D-channel in succession to it, adds a prescribed number of invalid bits to the resulting channel to form a new format as a whole. On the other hand, the conversion circuit 7 adds a prescribed number of invalid bits to a format for the 8-bit analog subscriber line to generate a format of the same constitution as new format constitution generated by the conversion circuit 6. Then the demultiplexer multiplexer circuit 8 demultiplexes/ multiplexes the format constitution of the same constitution as that outputted from both the conversion circuits.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a time division multiplex highway subscriber multiplexing system that can accommodate different interfaces in a subscriber exchange.

[Prior Art] Figure 2 shows analog subscriber lines and basic interface lines (2B+D) in remote locations described in the following document.
) is a simplified blower diagram showing a conventional remote multiplexing device accommodating a conventional remote multiplexing device.

Literature: “NEC Technical Report”\lol, 42. No, 3/1
989, page 24-29 r Basic interface subscriber line transmission system" As shown in the figure, in the case of an analog subscriber line, one line is accommodated in the subscriber circuit 1, and the audio signal from this subscriber circuit 1 is accommodated. The line concentrator 3 accommodates a total of n lines.

The line concentrator 3 time-division multiplexes the voice signal into one frame per n lines, and transmits it to the subscriber exchange 4.

Next, in the case of basic interface lines, first the remote multiplexer 2 accommodates n basic interface lines (2B+D). Then, connect one basic interface line to one
It is expressed in units called words, and 11 words are multiplexed in one frame and transmitted to the subscriber exchange 4. Here, the B channel is an information channel of several Kb/s to several tens of Kb/s depending on the speed and band of the signal to be transmitted, and the D channel is used for sending dial signals, simultaneous communication,
This is a signal channel for services such as signal processing.

FIG. 3 shows the frame structure of each interface line A, B, C, and D drawn in FIG. 2. A indicates the output of the audio signal V from each subscriber circuit 1, and each audio signal 2 is composed of 8 bits.

B shows how the outputs of the audio signals V of A are time-division multiplexed, and one frame is composed of n audio signals. C shows the configuration of the B channel and D channel of the basic interface line (2B+D), including the first 8-bit B1 channel, the following 1-bit B1 channel, and the following 8-bit 32-bit channel. channel, followed by a 1-bit B2 channel.

Further, D shows how C is multiplexed, and the entire C is expressed as one word, resulting in one frame of n words.

[Problems to be Solved by the Invention] However, in the conventional system, as can be seen from Fig. 2, two lines with different formats, such as an analog subscriber line and a basic interface line (2B+D),
In order to accommodate the two interfaces, two multiplexers were required, such as a line concentrator 3 that accommodates only subscriber lines and a remote multiplexer 2 that accommodates only basic interface lines.

For this reason, the number of devices increases, leading to higher costs.

Additionally, if analog subscriber lines and basic interface lines are located close to the subscriber switching center, the distance is short, and the concentrator and remote multiplexer lines can be routed separately to the central office. However, this poses technical and economic difficulties, especially in remote areas.

The present invention has focused on the above-mentioned problems and has been devised to effectively solve them.

An object of the present invention is to provide a new format configuration that allows two different interface lines to be easily multiplexed;
The object of the present invention is to provide a subscriber system multiplexing system that accommodates two different interface lines as described above into one.

[Means for Solving the Problems] The subscriber system multiplexing system of the present invention reconfigures the format configuration for the basic interface line in the digital highway demultiplexing system of the subscriber system exchange to solve the above-mentioned problems. a basic interface conversion circuit that adds invalid bits to this to form a new format; and an analog subscription circuit that adds invalid bits to the format for analog subscriber lines to form the same format as the new format configuration described above. It is equipped with a conversion circuit for analog subscribers, and a separation/multiplexing circuit that multiplexes the new format configuration output from the conversion circuit for basic interface and the new format configuration output from the conversion circuit for analog subscribers, and connects two different interface lines. can be easily multiplexed in one device.

[Operations] According to the present invention, for example, the basic interface switching circuit converts two 8-bit B channels in the basic interface line format to conform to the 8-bit format for the analog subscriber line, which will be described later. They are collected and combined into one, the D channel is connected to this, reconfigured, and a predetermined number of invalid pins I. are added to form a new format as an umbrella. On the other hand, the analog subscriber conversion circuit has the same format as the new format created by the basic interface switching circuit described above by adding a predetermined number of invalid bits to the 8-bit analog subscriber line format. Create.

The demultiplexing circuit demultiplexes the new format configuration output from the basic interface exchange circuit and the same format configuration output from the analog subscriber conversion circuit. This allows two different interface lines to be easily multiplexed by one multiplexer.

[Embodiment] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows a time-sharing highway (T) according to the present invention.
FIG. 4 is a block diagram showing the configuration of a remote multiplexing device implementing the D1(W) demultiplexing method. FIG. 4 is a diagram showing the frame structure formed by the TDHW demultiplexing method according to the present invention.

It should be noted that here, even when simply referring to a multiplexing system, it means a demultiplexing system that has both multiplexing and demultiplexing functions.

As shown in the figure, the remote multiplexer 5 includes a plurality of (two in the illustrated example) basic interface conversion circuits 6...
. . . a plurality of analog subscriber conversion circuits 7 (two in the illustrated example), and one TDHW separation/multiplexing circuit 8. Conversion circuit 7 for each analog subscriber
An analog subscriber line 9 such as a telephone set is connected to the terminal. The format of the signal transmitted to the analog subscriber line 9 consists of an 8-bit voice signal V, as shown in FIG. 3A, which has already been described. Each analog subscriber conversion circuit 7 adds a predetermined number of bits, specifically 24 bits (8 bits x 3), of invalid bits 13 to the 8-bit audio signal V, as shown in FIG. 4F. and total 3
A new format configuration consisting of 2 bits is formed.

The data in this new format is configured to be input to the TDHW demultiplexing circuit 8.

On the other hand, a basic interface line (2B+H) 10 is connected to each basic interface conversion circuit 6,
Each basic interface line 10 has a plurality of terminals 11.
...is connected.

The format structure of the signals transmitted to this basic interface line 10 is as shown in FIG. and 1
The D2 channel for bit signals is in order.

The basic interface conversion circuit 6 is configured to match the above-mentioned 8-bit audio signal for analog subscribers.
As shown in Figure 4E, 8-bit information channels B1 and B2 are collected at the beginning, followed by 1-bit signal channels D1 and UD2, the format configuration is reconfigured, and 14-bit information channels are added. (6 bits + 8 bits) of invalid bits are added to create a new format configuration of 32 bits, which is the same as the new format configuration of the analog subscriber conversion circuit as a whole. The data in this new format is configured to be input to the TDHW demultiplexing circuit 8.

In this case, the configuration is such that the valid bits are placed first and the invalid bits are placed later, but it is also possible to configure the bits in the reverse order. - Also, although the audio signal and basic interface format is set to 32 bits, it is not limited to this.

However, it is easier to implement this in terms of hardware by bringing the effective bits to the beginning or by setting the audio signal and basic interface format to 32 bits instead of 24 bits or something else. This is particularly the case in the embodiment.

The TDHW demultiplexing circuit 8 converts the new format configurations output from each of the huge interface conversion circuits 6 and the new format configurations output from each of the analog subscriber conversion circuits 7 as shown in FIG. 4G. It is designed to be able to be multiplexed as desired. The output from the demultiplexing circuit 8 is configured to be transmitted to the subscriber switching center 12 via a line 13. Note that the lines shown in FIG. 4G will be explained later.

Next, the operation of the apparatus configured as above will be explained.

When each basic interface line io (2B+D) is accommodated in the remote multiplexing device 5 as shown in the figure, each basic interface conversion circuit 6 reconfigures the configuration of the B channel and D channel shown by C in FIG. A pit is added to convert the structure to E in FIG.

E in FIG. 4 constitutes one basic interface (2B+D) with 4 bytes (32 bits).

B1 and B2 channels are assigned to the first two bytes, Dl and B2 channels are assigned to the first two bits of the third byte, and the rest is an invalid area. That is, the 8-bit B1 and B2 channels are placed at the beginning, and the next 8-bit,
Dl and B2 channels are arranged in the first two bits, and the remaining 14 bits are made invalid bits.

Furthermore, when analog subscribers are accommodated in the remote multiplexer 51, each analog subscriber conversion circuit 7 adds 24 invalid bits to the 8-bit audio signal (2) shown by A in FIG. Convert to the configuration of F in the figure.

F in FIG. 4 also constitutes one analog subscriber with 4 bytes (32 bits). In other words, the first byte I
The audio signal V is assigned to . . , and invalid bits are assigned to the remaining 3 bytes (24 bits) to form an invalid area.

When the signal with the new format configuration outputted from the basic interface conversion circuit 6 and the signal with the new format configuration converted and outputted by the analog subscriber conversion circuit 7 are accommodated in the TDHW demultiplexing circuit 8. , is multiplexed onto an arbitrary line as shown in G in FIG. Here, a line is a time slot of 4 by I. One frame is composed of these n lines.

In this way, Formats! - Two interface lines with different configurations can be easily multiplexed by one remote multiplexer 5. Note that the signals multiplexed from the subscriber switching center 12 are separated in the remote multiplexer 5, reconverted to the original format, and sent to the analog subscriber line and basic interface line.

As described above, according to this embodiment, lines with different interfaces such as analog subscriber and basic interfaces can be accommodated, and time-division highway demultiplexing can be easily performed to allow one line. , the lines can be easily routed to subscriber exchanges.

For example, if the analog subscriber line and basic interface line are located at a short distance from the subscriber switching center, the distance is short and it is possible to connect them separately to the central office without unifying them, but if the analog subscriber line and basic interface line are When located in a remote location, there are technical and economic difficulties. Therefore, accommodating and multiplexing lines with different interfaces into one as in the present embodiment is particularly advantageous when these lines are located far from the station.

In this embodiment, an analog subscriber line and a basic interface line have been described as two interface lines with different format configurations, but the present invention is of course not limited to this.

[Effects of the Invention] In summary, according to the present invention, a new format configuration that allows two different interface lines to be easily multiplexed is adopted, so one remote multiplexer can be used to multiplex an analog subscriber line and a basic interface line. It becomes possible to accommodate lines with different interface configurations and easily separate and multiplex them.

Furthermore, since this separation and multiplexing can be performed with one device, equipment costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the configuration of a remote multiplexer implementing the subscriber-based multiplexing system according to the present invention, FIG. 2 is a block diagram showing an example of the configuration of a conventional remote multiplexer, and FIG. 4 is a diagram showing the frame structure of each part in FIG. 1. FIG. 4 is a diagram showing the frame structure of each part in FIG. 5 is a remote multiplexing device, 6 is a conversion circuit for basic interface, 7 is a conversion circuit for analog subscribers, 8 is a time division highway demultiplexing circuit, and 12 is a subscriber switching center.

Claims (1)

[Claims] In a subscriber exchange that multiplexes basic interface lines and analog subscriber lines with different format configurations, the format configuration for the basic interface line is reconfigured and an invalid bit is added to it to create a new one. configuring a format, adding an invalid bit to the format for the analog subscriber line to make it the same format configuration as the new format configuration, and creating a new format configuration for the basic interface line and a new format configuration for the analog subscriber line. A subscriber system multiplexing system characterized by separating and multiplexing various format configurations.