JPS5992696A - Compound electronic switching device - Google Patents

Abstract

PURPOSE:To perform communication between different code systems by specifying a high transfer speed to deal with the difference in signal system automatically through an added circuit when switching operation is carried out while a multiplex circuit with a different analog/digital converting circuit is connected. CONSTITUTION:A PCM sound circuit 103 has a specific pattern *1 inserted into the 1st channel and pieces PCM sound information inserted into the 2nd - the 24th channels. On the other hand, a circuit 107 matched with 24 PCM channels by DELTAM encoding has a specific pattern *2 inserted into the 1st channel. Those circuits are identified by kind identifying circuits 108 and 109. Then, a control circuit 112 receives an identified signal and decides how the signal bit of data on a circuit (highway) is to be fetched. A gate circuit 118 is controlled by a control signal 113; the signal bits of the 24 PCM systems are supplied to a signal transmitting and receiving circuit 121 and signal bits of the DELTAM encoding system are supplied to a signal transmitting and receiving circuit 122. The outputs of the signal transmitting and receiving circuits 121 and 122 are supplied to a switching control circuit 123.

Description

[Detailed Description of the Invention] The present invention relates to a composite electronic switching device for voice, data, etc.
The purpose is to provide expandability so that an electronic exchange can handle digital signals in multiple sign formats.

Currently, most digital telephone switching systems are implemented in PCM code format. For this reason, it is impossible to connect systems configured using different digital encoding techniques 9, such as the ΔM method. However, there is a growing need for a switching system that comprehensively handles not only analog signals such as voice, but also systems that are becoming mixed with digital signals such as data, and the present invention provides an example of such a configuration. .

The present invention is based on a PCM audio signal (64 Kb/s) and uses a time division multiplexing system with 64 Kb/s as one channel. And this 6 per channel
Time division multiplexing is performed by accommodating a plurality of 1,544 Mb/s transmission lines (hereinafter referred to as highways) in which 24 channels of 4 Kb/s digital lines are time division multiplexed. Note that this is an encoding method other than PCM.

For example, in the case of a ΔM encoded signal, one channel is 64Kb/
32Kb/s of the capacity of s is used as a signal.

Excess information bits are left blank and the information speeds are matched so that the communication path can be shared. Furthermore, since the highway accommodating route is arbitrary, a specific channel on the highway is used as a specific pattern to distinguish between them.

However, this only needs to be done at the time of initial setup, etc., and after that, it can be used as a normal channel.

The highway type is identified based on the specific pattern of the specific channel on the highway, and signals are transmitted and received by guiding the signal to the corresponding signal circuit. In addition, in the case of mutual communication between different types of highways, a code conversion circuit l/
The configuration is such that mutual communication is possible by performing conversion based on rank.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of an embodiment of the present invention.

100 is a telephone set, 1 old is a telephone subscriber line, and 102 is a 24-channel PCM terminal equipment. 103 is PCM24
Channel 1.544 Mb/s digital line is shown.

FIG. 2 shows a frame format on a 1.544 Mb/s PCM transmission line, and one channel is 64 Kb/s and consists of 8 bits. Time division exchange is performed for 64 Kb/s 1 channel.

104 is a terminal device using a code conversion method other than the PCM method;
/ channel x 11 multiplexing circuit is assumed. That is, 32 as shown in FIG. 6(a) or FIG. 6(b).
A multiplex circuit of Kb/s x 11 channels (352 Kb/s) is assumed. Reference numeral 105 indicates this multiplex transmission path. Reference numeral 106 denotes a digital terminal equipment that accommodates a plurality of transmission lines 105 and further converts the transmission rate per Vc1 channel to 64 Kb/sK.

107 is a 352Kb/s line using the ΔM encoding method for two lines.

In other words, data for 11 (multiplex) x 2 = 22 subscribers is PCM
2nd channel to 23rd channel of 24 channels (22
This shows the transmission path for multiplexing and transmitting signals (for each channel).

FIG. 3(c) shows the time division multiplexed diagram.

In this case, 64Kb/s is half the content of one channel.

That is, only 32 Kb/s of information is transmitted. In FIG. 6(C), the remaining bits marked with * are used for signal bits, but the excess bits are left blank.

Note that the reason for excluding the first channel in this case will be described later.

108 and 109 are highway type determination circuits.

The digital data on each highway has a specific pattern inserted into a specific channel.

The configuration is such that the type can be determined by determination circuits 108 and 109.

Figure 4 shows the format of a conventional PCM audio line.
A specific pattern *1 is inserted into the first channel, indicating that the second to 24th channels are PCM audio lines.

FIG. 5 shows the audio or data format according to the ΔM method, which can also be identified by the specific pattern *2 of the first channel.

Reference numerals 110 and 111 indicate transmission lines of the specific pattern, and the control circuit 112 receives these signals.

Controls how signal bits of data on the highway are taken in. Reference numeral 118 denotes a gate circuit for performing this control, which is led to respective signal transmitting/receiving circuits 121 and 122 through lines 119 and 120. In this embodiment, the signal transmitting/receiving circuit 121 assumes the PCM24 system and handles signal bits of the PCM system, for example, as follows. That is, one bit of the eight PCM bits is used as a signal bit and the remaining seven bits are used as information bits.

Reference numeral 122 denotes a signal transmitting/receiving circuit that handles signal information of the ΔM encoding system, and an example is shown in which a common line signal on a 552 Kb/s line is handled.

Figure 6 shows the bit arrangement on a 352Kb/s line, with 1
Ch1. Janel is used as a common line signal channel (frame synchronization and signal channel) F/S. The dog frame shown in FIG. 7 is obtained by 18 small frames, and the signal bits are extracted from the bit arrangement to detect the signal for each channel.

Reference numeral 123 indicates a control circuit that receives signals from the signal transmitting/receiving circuits 121 and 122 and controls the exchange.

vinegar. 124 indicates a time division communication path, 64Kb/s/
Time division exchange is performed in units of channels. Various methods have been proposed for this configuration, so detailed description thereof will not be given here. Reference numeral 125 denotes a circuit that performs conversion between the above two code systems when a call occurs between the PCM line and the ΔM line. Possible configuration examples include joining or digital processing, but in the latter case, it is economical to use a multiprocessing method.

As explained above, when accommodating multiple lines with different analog/digital conversion circuits and performing switching operations, the present invention unifies the higher transfer rate and automatically processes differences in signal formats using an additional circuit. By configuring this, it is possible to share a 9-time division communication path and to enable communication between different code systems.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
The figure shows a multiplex format on a time division multiplex line in the case of the PCM24 channel terminal system, and FIG. FIG. 2 is a diagram illustrating how time division multiplexing is performed on a /s multiplex line. Figure 4 shows that a specific pattern is inserted into the first channel of the 24 PCM channels to distinguish between multiple channels, and the remaining 2
This is a diagram showing that three channels are used as communication paths, and in FIG. 5, the first channel is used for a specific pattern as in FIG.
Figure 6 shows the case where information for lines is multiplexed.
The arrangement of frame synchronization, signal bits and information bits of a Kb/s line is shown, and FIG. 7 shows a common line signal formant consisting of 352 Kb/s F/s bits. In the figure, 100 is a telephone, and 1o2 is a PCM terminal device. 104 is a terminal device, 108 and 109 are discrimination circuits, 11
2 is a control circuit, 118 is a gate circuit, 121, 122
123 is a signal transmission/reception circuit, 123 is an exchange control circuit, 124 is a time division communication path, and 125 is a code conversion circuit. 3rd (n,) Figure (G) CH2CH3~GH1+ GH12~CH24
Figure 4 □□H Telephone 8 Old Nu is Te'-Yu Frost 1 Divination Nu Hau 2 Evening 11 Child Channel
1F Channel Figure 6 Figure 7

Claims (1)

[Claims] 1. Two 64Kb/s digital lines per channel
1,544 Mb/s transmission line with 4 channels time division multiplexed (
(hereinafter referred to as highway), accommodates multiple lines. In a time division multiplex exchange that performs time division multiplexing,
A time division multiplex line that digitizes analog signals using the PCM system, and a line that uses a code conversion system different from the PCM system and that has an information volume of 1.544 Mb/s or less are treated as highways at the same speed. In addition to separately installing exchange signal processing equipment compatible with each encoding method, a circuit is also installed to detect which encoding method the line is based on a special code inserted into a specific channel on the highway. In the case of communication between different encoding systems, the same communication path can be shared by connecting the code conversion circuit trunk provided in the switching equipment. A composite electronic switching device characterized by being configured to enable communication between different code formats.