JPH03155235A - 2Mbit/s interface signaling system - Google Patents

Abstract

PURPOSE:To simplify the circuit by interconnecting data group comprising 2 specific channels with a specific digital interface and acquiring connection information for 30 channels of data comprising mainly PCM voice information from the connection data included in 4 consecutive data groups. CONSTITUTION:Data of 30 channels comprising mainly 8-bit PCM voice information and a data group comprising 2-channel of 8-bit connection data are interconnected by a digital interface whose transmission speed is 2.048Mbit/sec. Then 30-channel of data connection information mainly comprising PCM voice information is acquired from a connection data included in 4 consecutive data groups. Thus, digital interfacing is attained with small scale equipment constitution between digital exchanges 1, 6 and time division multiplexers 2, 5 used in the same premises.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an individual line signaling system necessary for interconnection between multiple devices, and in particular, to switching equipment and time division multiplexing equipment installed in the same station or on the same premises. The present invention also relates to a 2 Mbit/sec interface individual line signaling system for obtaining connection information when interconnecting a plurality of digital exchanges using a digital interface with a transmission rate of 2.048 Mbit/sec.

[Conventional technology]

Generally, when digital exchanges in separate office buildings are interconnected using digital lines, the connection form shown in FIG. 2 is used. Each of the digital exchanges 1.6 is connected to a time division multiplexer 2.5, each of the time division multiplexers 2.5 is connected to a network termination device 3.4, and the network termination devices 3.4 are connected by a digital line. It is. The PBX-70M digital interface is a conventional method that defines the connection between the digital exchange and the time division multiplexer (TDM) (see TTC Standards Volume 81, Volume 8 - PBX Related Interfaces).

This method performs mutual communication using the frame structure shown in FIG. In the figure, the beginning is on the left, T is the frame section, 7 is the time slot number, 8 is the channel number, and 9
is a bit number, and 10 is a multiframe number. Time slot number “0” is used as a signal time slot, time slot number “16” is unused, and time slot number “11” to “15” are data channels “1” to “15”.
15” and time slot numbers “17” to “
31" is used as data channels "16" to "30". Also, all time slots consist of 8 bits.

The signal time slot consists of the configuration shown by reference numeral 11 in FIG. "3" is a device alarm bit, and numbers "4" to "8" are individual signal bits.

A combination of eight signal time slots was called one multiframe, and connection information for 30 channels could be obtained from the eight frames.

Note that the symbol IO in FIG. 4 indicates a multi-frame number.

[Problem to be solved by the invention]

In the conventional PBX-TDM digital interface described above, multi-frame synchronization of 8 frames must be mutually established before mutual communication, and the synchronization signal generation circuit and synchronization detection establishment circuit for this become complex. Another disadvantage is that the multiframe number must be estimated from the multiframe number identification bits.

[Means to solve the problem]

In order to eliminate such drawbacks, the 2 Mbit/s interface signaling system according to the present invention provides data consisting of 30 channels of data mainly consisting of 8-bit PCM audio information and 2 channels of 8-bit connection data. The groups are interconnected by a digital interface with a transmission rate of 2.048 Mbit/s, and connection information for 30 channels of data, mainly consisting of PCM audio information, is obtained from the connection data contained in four consecutive data groups. It is.

[Effect]

The 2 Mbit/sec interface signaling system according to the present invention can be connected more easily than the conventional system, and can be easily converted to the conventional system.

〔Example〕

FIG. 1 is a configuration diagram of a digital bit pattern for explaining an embodiment of the 2 Mbit/sec interface signal system according to the present invention. In the figure, the same or equivalent parts as in FIG. It is attached. This is made up of a data group consisting of 30 channels of data mainly consisting of 8-bit PCM audio information and 2 channels of 8-bit connection data.

Bit number “1” of time slot number “0” and bit number “l” of time slot number “16” are F bits for synchronization, bit number “2” of time slot number “0”,
'3' is combined to display the multi-frame number in binary, and bit number '3' of time slot number '16'
is S bit for device alarm, time slot number “O”
, "16" indicates that it is not specified.

A1-A30 are time slot numbers "l" to "15"
, channel number “l” located at “17” to “31”
These are individual signal bits corresponding to the bits from 30 to 30, respectively. Each channel is controlled by individual signal bits A1 to A.
By up to 30, the condition of signal bit A is in use "0",
If you decide that the free space is "1", the information for channel number "l" will be A.
According to the state of 1, if it is rOJ, it is known that the user is off-hook, and if it is "1", it is known that the user is on-footer.

In order for the opposing device to obtain information on all channels, it must receive the time slot number "O"16" for four frames, but this is sufficiently fast compared to audio information, so this is not a problem.

If a call is made from channel number "1", the corresponding individual signal base AI changes from rlJ to "0". The partner exchange that detected the change prepares to receive the selection signal transmitted through channel number "l" and waits. After receiving the selection signal, it connects with the requested connection destination and sends the AI corresponding to channel number "1" to the originating side. change. Thereafter, both exchanges monitor the individual signal bit A1 of the own subscriber and the other subscriber, and if there is a change, disconnect.

While performing the series of operations described above, the exchange must constantly monitor the individual signal bits and multiframe number bits, including other channels, but the simpler the multiframe configuration, the better the exchange equipment configuration. becomes smaller. Furthermore, when competing with an exchange that can only be connected using the conventional method, it is easy to rearrange the arrangement of individual signal bits in the bit arrangement of this method to the conventional method. Furthermore, it can be used in a simple manner as a 2 Mbit/sec interface individual line signaling system for connecting frame digital exchanges installed in the same premises.

〔Effect of the invention〕

As explained above, the present invention is capable of transmitting a data group consisting of 30 channels of data mainly consisting of 8-bit PCM audio information and 2 channels of 8-bit connection data to digital data at a transmission rate of 2.048 Mbit/s. By interconnecting with an interface and obtaining connection information for 30 channels of data mainly consisting of PCM audio and information from the connection data included in 4 consecutive data groups, the connection data included in 8 consecutive data groups can be obtained. Since it is easier to connect than the conventional method of obtaining connection information from the network, digital connections can be made with a small-scale equipment configuration between a digital exchange used within the same premises and a time division multiplexer or multiple digital exchanges. effective.

Furthermore, since it can be easily converted to the conventional system by changing the arrangement of the individual signal bits, it also has the advantage of being highly flexible.

[Brief explanation of the drawing]

FIG. 1 is a digital pattern diagram for explaining an embodiment of the 2 Mbit/sec interface signaling system according to the present invention, and FIG. 2 is a system diagram showing a general digital exchange connection.
Figure 3 is a digital bit pattern diagram of the conventional method, Figure 4
The figure is a digital bit pattern diagram showing a conventional multi-frame.

Claims (1)

[Claims] Between a digital exchange and a time division multiplexer or multiple digital exchanges installed in the same station or on the same premises, 3-bit data consisting mainly of 8-bit PCM voice information
A data group consisting of two channels of 0 channel and 8-bit connection data is interconnected by a digital interface with a transmission rate of 2.048 Mbit/s, and the PCM is extracted from the connection data included in the four consecutive data groups. A 2 Mbit/sec interface signaling system characterized by obtaining connection information for 30 channels of data, mainly voice information.