JPH0595341A - Automatic junction line transmission speed setting system for connector - Google Patents

Abstract

PURPOSE:To eliminate the need for the setting of the transmission speed. CONSTITUTION:A time division junction line whose transmission speeds are two kinds (a or b bps) is connected to a connector 12 as a line 1. Then a synchronization frame scanning circuit 6 discriminates which transmission speed of the time division junction line to be connected is in use. That is, the synchronization frame scanning circuit 6 collects plural bits of a junction line control signal extracted by a control signal extract circuit 5 from a junction line signal and collates the signal with a synchronization frame pattern for each of the transmission speeds a, b of the time division junction line to discriminate the transmission speed of the time division junction line accommodated to the connector 12. A synchronization signal generating circuit 3, a synchronization circuit 4 and a junction line signal generating circuit 10 selects a synchronizing clock whose transmission speed is (a) or (b) from a clock generating circuit 2 based on the result of discrimination and implements synchronization of the time division junction line signal and the generation of the time division junction line signal based on the clock.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for setting a trunk line transmission speed of a connecting device for connecting a time division trunk line and a packet switch.

[0002]

2. Description of the Related Art Conventionally, in a connection device for connecting a time division relay line connected to a time division exchange and a packet exchange,
An interface is provided for each relay line having a different transmission speed, and these interfaces are switched by a switch according to the transmission speed of the relay line to be accommodated.

An example of such a conventional connecting device is shown in FIG. Two kinds of time division relay lines having different transmission rates, that is, the line (1) or the line (2) can be connected to the connecting device 116, and the transmission rate of the line (1) is a (bp).
s), and the transmission rate of the line (2) is b (bps). First, the interface on the line (1) side will be described. The clock extraction circuit 100 extracts a relay line clock having a transmission rate of a from the time divisional relay line signal transmitted through the line (1). On the other hand, the clock generation circuit 102 generates two synchronous clocks having transmission rates a and b in synchronization with the reference clock in the connection device. Then, the synchronization signal generation circuit 103 synchronizes the time division relay line signal with the reference clock of the connection device by the relay line clock from the clock extraction circuit 100 and the synchronization clock of the transmission rate a from the clock generation circuit 102. Generate a synchronization signal for
The synchronization circuit 105 receives the synchronization signal, and the line (1)
The time-division relay line signal is synchronized with the reference clock of the connection device.

Next, the interface on the line (2) side will be described. The clock extraction circuit 101 extracts a relay line clock having a transmission speed b from the time divisional relay line signal transmitted on the line (2). Then, the synchronization signal generation circuit 10
4 is a relay line clock from the clock extraction circuit 101,
A synchronization signal for synchronizing the time division relay line signal with the reference clock of the connection device is generated by the synchronization clock of the transmission rate b from the clock generation circuit 102, and the synchronization circuit 106 receives the synchronization signal by the synchronization signal. Synchronize the time division repeater signal of line (2) with the reference clock of the connection device.

The relay line switching circuit 109 includes a synchronizing circuit 10
One of the time-division relay line signals received from 5, 106 is selected and output according to the setting state of the relay line transmission speed setting switch 115. The setting switch 115 is a switch for setting the transmission speed a or b, and is operated and set by a maintenance person. Here, the transmission speed a is set. The switching circuit 109 is the synchronization circuit 105.
Select the time-division trunk line signal from.

The trunk line control signal extraction circuit 110 extracts the trunk line control signal and the time-division trunk line data from the time-division trunk line signal received from the switching circuit 109. And
The B channel packet conversion circuit 112 is a signal extraction circuit 11
Time-division trunk line data is received from 0, converted into B channel packet data, and output to the packet switch interface circuit 114. The conversion circuit 112 also receives the B channel packet data from the interface circuit 114, converts the B channel packet data into time division relay line data, and transmits the time division relay line data to the relay line signal generation circuits 107 and 108 described later.

The control circuit 111 receives the trunk line control signal from the signal extraction circuit 110, collates the sync frame pattern, converts the trunk line control signal other than the sync frame pattern into control data, and then the D channel packet conversion circuit 11
3 and also converts the control data received from the D channel packet conversion circuit 113, which will be described later, into trunk line control signals and sends them to the trunk line signal generation circuits 107 and 108.

Packet switch interface circuit 11
4 is the B-channel packet data received from the B-channel packet conversion circuit and the D-channel packet data received from the D-channel packet conversion circuit converted into packet multiplex data and transmitted to the packet switch, while the packet multiplex received from the packet switch The data is converted into B channel packet data and D channel packet data and transmitted to the B channel packet conversion circuit 112 and the D channel packet conversion circuit 113, respectively. Then, the D channel packet conversion circuit 113 converts the D channel packet data received from the interface circuit 114 into control data and outputs the control data to the control circuit 111, while the control data received from the control circuit 111 is converted into D channel packet data. Convert to interface circuit 11
Send to 4.

The trunk line signal generation circuit 107 inserts the trunk line control signal received from the control circuit 111 into the time division trunk line data received from the B channel packet conversion circuit 112, and the time division into which the trunk line control signal is inserted. The relay line data is converted into a time-division relay line signal by the synchronous clock of the transmission rate a from the clock generation circuit 102 and sent to the line (1). Similarly, the trunk line signal generation circuit 108 also inserts the trunk line control signal received from the control circuit 111 into the time division relay line data received from the B channel packet conversion circuit 112, and the time division relay in which the trunk line control signal is inserted. The line data is converted into a time division relay line signal by the synchronous clock of the transmission speed b from the clock generation circuit 102, and the line (2)
To send to.

[0010]

As described above, in the conventional connection device, an interface is provided for each relay line having a different transmission rate, and a maintenance person switches the switch 115 in accordance with the transmission rate of the accommodated relay line. It was switched by. Therefore, there are many cases in which the connection device does not operate normally due to an error in setting the transmission rate due to a human error.

An object of the present invention is to solve such a problem and to make it possible to accommodate time-division relay lines having different transmission speeds without performing any setting work of the transmission speed. To provide a setting method.

[0012]

SUMMARY OF THE INVENTION According to the present invention, a trunk line transmission rate is set by a connection device which accommodates time division trunk lines having different transmission rates and which connects the accommodated time division trunk line and a packet switch. In the method, the synchronization for identifying the transmission rate of the time division relay line by a relay line control signal extracted from the time division relay line signal transmitted through the time division relay line, and outputting predetermined information representing the identified transmission rate. A frame scanning circuit, a clock generation circuit that generates a plurality of clocks that are synchronized with the reference clock of the connection device and that have different transmission speeds and that match the respective transmission speeds of the time division relay lines, and the time division relay. A clock extracting circuit for extracting a relay line clock from a line, and a part for outputting the synchronous frame scanning circuit among the plurality of clocks generated by the clock generating circuit Of the transmission speed represented by the information of (1) and synchronization for synchronizing the time division relay line signal with the reference clock of the connection device by the clock and the relay line clock extracted by the clock extraction circuit. A synchronization signal generating circuit for generating a synchronization signal, a synchronization circuit for synchronizing the time division relay line signal with the synchronization signal generated by the synchronization signal generating circuit, and a B channel packet from the packet switch. A packet conversion circuit that exchanges data for time-division relay line data and outputs the data, and exchanges D-channel packet data from the packet switch for a relay line control signal and outputs the packet, and the time-division relay that the packet conversion circuit outputs. The synchronous frame among the plurality of clocks generated by the clock generation circuit by inserting the relay line control signal into line data The clock of the transmission speed represented by the predetermined information output by the check circuit is selected, and the time-division relay line data in which the relay line control signal is inserted is converted into a time-division relay line signal by the clock, and And a relay line signal generation circuit for transmitting to the split relay line.

[0013]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows an example of a connection device based on the trunk line transmission rate automatic setting system of the present invention. Two types of time division relay lines having a transmission rate of a (bps) or b (bps) are connected to the connection device 12 as a line (1). Then, the synchronous frame scanning circuit 6 discriminates which is the transmission speed of the connected time division relay line, and based on the discrimination result, the synchronizing signal generating circuit 3, the synchronizing circuit 4, and the relay line. The signal generation circuit 10 synchronizes the time-division relay line signal and generates the time-division relay line signal, respectively, with the synchronous clock of any transmission rate from the clock generation circuit 2.

The details will be described below. The clock extraction circuit 1 extracts a relay line clock having a transmission rate of a or b from the time-division relay line signal transmitted on the line (1) according to the transmission rate of the line (1). On the other hand, the clock generation circuit 2 generates two synchronous clocks having transmission rates a and b in synchronization with the reference clock in the connection device.

The relay line control signal extraction circuit 5 extracts the relay line control signal from the time divisional relay line signal received from the synchronization circuit 4 described later and outputs it to the synchronous frame scanning circuit 6. The synchronous frame scanning circuit 6 collects a plurality of bits of the relay line control signal and collects them for the transmission speed a,
By matching with the sync frame pattern for each b,
The transmission speed of the time division relay line accommodated in the connection device is identified. Then, information indicating the identified transmission rate is sent to the control circuit 7
Output to. The synchronous frame scanning circuit 6 uses, as the synchronous frame pattern, the synchronous frame pattern of the trunk line control signal synchronized by the synchronous clock whose transmission speed is a in the synchronizing circuit 4 when the transmission speed of the time divisional trunk line is a. And a synchronous frame pattern of a relay line control signal synchronized with a synchronous clock having a transmission speed of b, and a relay synchronized with a synchronous clock having a transmission speed of a in the synchronizing circuit 4 when the transmission speed of the time division relay line is b. The synchronization frame pattern of the line control signal and the synchronization frame pattern of the trunk line control signal synchronized by the synchronization clock having the transmission speed b are stored.

When the control circuit 7 receives the above information from the synchronous frame scanning circuit 6, the control circuit 7 transmits, based on the information, which one of the synchronous clocks a and b the transmission rate generated by the clock generating circuit 2 is to be selected. The speed control signal is transmitted to the synchronization signal generation circuit 3 and the relay line signal generation circuit 10.

Then, the synchronization signal generating circuit 3 is based on the control signal from the control circuit 7, and the clock generating circuit 2
Of the two transmission speeds a and b, which are generated by the clock signal, select one of the synchronous clocks and the relay line clock from the clock extraction circuit 1 to output the time divisional relay line signal to the reference clock of the connection device. Generate a synchronization signal for synchronizing to. The synchronization circuit 4 synchronizes the time-division relay line signal of the line (1) with the reference clock of the connection device by this synchronization signal.

The time division relay line signal synchronized by the synchronizing circuit 4 is transmitted to the relay line control signal extracting circuit 5,
Therefore, the trunk line control signal is extracted and transmitted to the synchronous frame scanning circuit 6 as described above. The trunk line control signal extraction circuit 5 sends the time division trunk line data obtained by removing the trunk line control signal from the time division trunk line signal to the B channel packet conversion circuit 9.

The B-channel packet conversion circuit 9 receives the time-division relay line data, converts it into B-channel packet data, and transmits it to the packet switch interface circuit 11. Further, the control circuit 7 transmits the control signal, and after the transmission speed of the time division relay line is set, receives the relay line control signal through the synchronous frame scanning circuit 6,
It is converted into control data and sent to the D channel packet conversion circuit 8. Then, the D channel packet conversion circuit 8 converts the control data into D channel packet data and transmits it to the interface circuit 11.

Packet switch interface circuit 11
When receiving the B channel packet data and the D channel packet data from the conversion circuits 9 and 8, respectively, converts them into packet multiplexed data and sends them to the packet switch.

On the other hand, when the interface circuit 11 receives the packet multiplexed data from the packet switch, it converts it into B channel packet data and D channel packet data, and the B channel packet conversion circuit 9 and the D channel packet conversion circuit 8 respectively. Send. Then, the D-channel packet conversion circuit 8 converts the D-channel packet data received from the interface circuit 11 into control data and outputs the control data to the control circuit 7, and the B-channel packet conversion circuit 9 includes the interface circuit 1
The B channel packet data received from 1 is converted into time division relay line data and transmitted to the relay line signal generation circuit 10 described later. The control circuit 7 converts the control data received from the conversion circuit 8 into a trunk line control signal and sends the trunk line control signal to the trunk line signal generation circuit 10 together with the transmission speed control signal.

The relay line signal generation circuit 10 is responsive to the transmission rate control signal from the control circuit 7 to generate the clock generation circuit 2.
, One of two synchronous clocks of transmission rates a and b generated by the B channel packet conversion circuit 9 is selected.
The relay line control signal received from the control circuit 7 is inserted into the time division relay line data received from the time division relay line data, and the time division relay line data in which the relay line control signal is inserted is converted into the time division relay line signal by the selected synchronization clock. It is converted and sent to the line (1).

[0023]

As described above, in the connection device based on the automatic trunk line transmission rate setting method of the present invention, the synchronous frame scanning circuit identifies the transmission rate of the time division relay line, and the synchronous clock of the transmission rate is automatically determined. Selected,
Synchronization of the time division relay line signal and generation of the time division relay line signal are performed. Therefore, unlike the conventional case, the maintenance person does not need to set the switch for setting the transmission speed, and the device does not operate properly due to human error. Also, since the work of setting the transmission speed is unnecessary,
Maintainability is also improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a connection device based on a trunk line transmission rate automatic setting system of the present invention.

FIG. 2 is a block diagram showing an example of a connection device based on a conventional trunk line transmission speed setting method.

[Explanation of symbols]

 1 clock extraction circuit 2 clock generation circuit 3 synchronization signal generation circuit 4 synchronization circuit 5 relay line control signal extraction circuit 6 synchronization frame scanning circuit 7 control circuit 8 D channel packet conversion circuit 9 B channel packet conversion circuit 10 relay line signal generation Circuit 11 Packet switch interface circuit 12 Connection device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location H04L 12/56 H04Q 11/04 9076-5K H04Q 11/04 T

Claims (3)

[Claims] 1. A time-division trunk line having different transmission speeds is accommodated,
In a method of setting a relay line transmission speed at a connection device that connects the accommodated time division relay line and a packet switch, a relay line control signal extracted from a time division relay line signal transmitted through the time division relay line is used. A synchronous frame scanning circuit that identifies the transmission rate of the time division relay line and outputs predetermined information indicating the identified transmission rate; and a synchronization frame scanning circuit that synchronizes with the reference clock of the connection device and has different transmission rates. A clock generation circuit that generates a plurality of clocks having transmission speeds that match each transmission speed, a clock extraction circuit that extracts a relay line clock from the time division relay line, and a clock generation circuit that generates a plurality of clocks generated by the clock generation circuit. Among them, the clock of the transmission speed represented by the predetermined information output by the synchronous frame scanning circuit is selected, and the clock and the clock extraction time are selected. A synchronization signal generating circuit for generating a synchronization signal for synchronizing the time divisional relay line signal with the reference clock of the connection device by the relay line clock extracted by a path; And a synchronization circuit that synchronizes the time-division relay line signal with the synchronization signal generated by the B-channel packet data from the packet switch, exchanges the B-channel packet data with the time-division relay line data, and outputs the data. A packet conversion circuit for exchanging D channel packet data for a relay line control signal and outputting the same, and inserting the relay line control signal in the time division relay line data output by the packet conversion circuit to generate the clock generation circuit. Of the plurality of clocks to be selected, the clock of the transmission speed represented by the predetermined information output by the synchronous frame scanning circuit is selected, and the clock is selected. A relay line signal generating circuit for converting the time-division relay line data into which the relay line control signal is inserted into a time-division relay line signal and transmitting the time-division relay line signal to the time-division relay line. Automatic connection line transmission speed setting method for connected devices. 2. The synchronization frame scanning circuit identifies the transmission rate of the time division relay line by comparing the relay line control signal with a synchronization frame pattern for each transmission rate of the time division relay line, and the identified transmission is performed. 2. The automatic trunk line transmission speed setting method for a connection device according to claim 1, wherein predetermined information indicating a speed is output. 3. The synchronous frame scanning circuit identifies the transmission speed of the time division relay line by comparing the predetermined number of bits of the relay line control signal with a synchronization frame pattern for each transmission speed of the time division relay line. Then, the predetermined information indicating the identified transmission rate is output, and the automatic trunk line transmission rate setting method of the connection device according to claim 2.