KR100388268B1 - Synchronous channelizing apparatus of digital data and channel service unit thereby - Google Patents

Abstract

An object of the present invention is to provide a synchronous channelizing apparatus for digital data capable of synchronous channelizing a plurality of DS2 grade digital data in a T3 class frame and a T3 grade channel service unit using the same. The synchronous channelizing apparatus for digital data generating a channel rising clock as a reference for inserting / extracting a T3 into a channel portion of a T3 frame comprises: programmable distributing means for dividing and outputting a source clock at a division ratio corresponding to an input feedback value; Feedback value selecting means for applying a feedback value corresponding to the division ratio of the programmable distributing means to the programmable dispensing means and outputting the divided clock signal output from the programmable distributing means as a reference clock according to the selected channel mode; Output through feedback value selection means It consists of channel rising clock generating means for generating the channel rising clock corresponding to the number of channels selected by the user by inputting the quasi-clock and generating a channel rising clock to enable synchronous channel rising and apply it to the T3-class CSU (channel service unit). Thus, synchronous channelizing is performed.

Description

Synchronous channelizing device for digital data and T3-class channel service unit using it {SYNCHRONOUS CHANNELIZING APPARATUS OF DIGITAL DATA AND CHANNEL SERVICE UNIT THEREBY}

The present invention relates to a data communication device (DCE) provided at the end of a T3 transmission line capable of transmitting a digital signal (DS-3) at a transmission rate of 44.746 Mbps per second, and more specifically, a plurality of DSs. The present invention relates to a synchronous channelizing apparatus for digital data and a T3 channel service unit using the same to enable digital data to be transmitted in a synchronous manner through a T3 level transmission line.

Among transmission facilities that transmit digital data, T3 level line is a transmission line that can transmit digital signal at 44.746Mbps / sec. It has up to 672 channels and is used to make backbone faster than T1 level. . At this time, the signal transmitted to the T3 line is called DS3.

A data communication device (DCE) connecting the T3-class line with a data terminal device (DTE) conventionally receives seven different DS2 signals from seven DS2 class devices 11, as shown in FIG. It receives the input, and converts it into a DS3 signal. At this time, seven different DS-2 signals are asynchronous signals, and synchronous channelizing is not possible in a conventional T3-class data communication device.

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-mentioned conventional problems, and an object thereof is a synchronous channelizing apparatus for digital data capable of channelizing a plurality of synchronized digital data into a T3-class frame, and a T3-class channel service unit using the same. To provide.

1 is a block diagram schematically showing a conventional T3-class digital data transmission apparatus.

2 is a block diagram showing the configuration of a T3-class channel service unit with a synchronous channelizing function according to the present invention.

3 is a block diagram illustrating a synchronous channelizing apparatus for digital data according to the present invention.

4 is a timing diagram showing a channelizing clock for each channel mode generated according to the present invention.

* Description of the symbols for the main parts of the drawings *

21: channel rising unit

22: router

23: Channel Service Unit (CSU: CHANNEL SERVICE UNIT)

31: programmable divider

32: feedback value selector

33: channelizing clock generator

The present invention provides a synchronous channelizing apparatus for digital data generating a channel rising clock as a reference for inserting / extracting a plurality of digital data into a channel portion of a T3 frame. ,

Programmable dispensing means for dividing and outputting the source clock at a division ratio corresponding to the input feedback value;

Feedback value selection means for applying a feedback value corresponding to the division ratio of the programmable division means to the programmable division means according to a channel mode selected by the user and outputting the divided clock signal output from the programmable division means as a reference clock;

And a channel rising clock generating means for receiving the reference clock output through the feedback value selecting means and generating a channel rising clock corresponding to the number of channels selected by the user.

In addition, a T3-class channel service unit using a synchronous channelizing apparatus for synchronously channelizing DS2 digital data transmitted from a DS2-class apparatus according to the present invention,

A channel rising device unit for generating a channel rising clock indicating a point of insertion / extraction for each channel in all available timeslots according to a channel mode and number of channels selected by a user;

According to the channelizing clock input from the channelizing device unit, it comprises a CSU unit for performing multiplexing or demultiplexing by inserting / extracting DS2 signals transmitted from one or more DS2 class devices into the channel portion of the T3 frame do.

Typical data communication devices include data service units (DSUs) and channel service units (CSUs). Dual channel service units maintain the state of the line to ensure that the network is in compliance with FCC standards and to the central office. In response to the loopback command, and also to ensure that the sequence of bit streams transmitted maintains the proper density, correct the bipolar violation, and so on.

The present invention is to enable synchronous channelizing in a T3-class channel service unit, and the configuration and operation of a synchronous channelizing apparatus for T3-class digital data according to the present invention will be described in detail with reference to the accompanying drawings. .

FIG. 2 is a block diagram showing an embodiment of a synchronous channelizing apparatus for T3-class digital data according to the present invention, which is similar to or different from the channelizing unit 21 for generating a channelizing clock according to the channel mode and the number of channels. A plurality of routers 22 and a plurality of routers 22 which connect different local area networks using the same protocol and transmit DS2 signals to a destination according to a channel rising clock applied from the channel rising unit 21. CSU processing multiplexing or demultiplexing by sequentially inserting / extracting a plurality of different DS2 signals transmitted through the channelizing unit 21 according to the channelizing clock applied from the channelizing unit 21 to the data channel unit of the T3 frame ( 23).

In the above, the channel rising unit 21 generates an appropriate channel rising clock according to the channel mode and the number of channels input by the user, and applies the channel rising clock to the CSU 23 as a channel rising clock.

As shown in FIG. 3, the channelizing unit 21 is configured to divide the input source clock to generate a reference clock, and the programmable divider according to the input channel mode. A feedback value selector 32 for setting a feedback value related to the division processing of (31) and a reference clock generated from the programmable dispensing unit 31 according to the feedback value of the feedback value selector 32; The channel rising clock generating unit 33 generates a channel rising clock in accordance with the number of channels to be inserted.

In the above description, the channel mode input to the channelizing unit 21 represents a unit for each channel within the set time slot of the T3 frame, and the number of channels represents the number of channels to be multiplexed or demultiplexed.

In the present embodiment, the generation of the channelizing clock will be described taking the case of the 147 channel method and the 7 channel method as an example.

First, the programmable frequency divider 31 divides the input source clock to generate a reference clock. At this time, the division ratio is determined according to the feedback value set by the feedback value selector 32. For example, when the channel mode is 147 mode, the feedback value selector 32 applies the feedback value 147 to the programmable divider 31, whereby the non-programmable divider 31 supplies a source clock. Divide by 1/147 and output it to the feedback value selector 32. The feedback value selector 32 inputs the output signal of the programmable frequency divider 31 to the channelizing clock generator 33 as a reference clock. Let's do it.

As another example, when the channel mode is 7 mode, the feedback value selector 32 applies the feedback value 7 to the programmable divider 31, whereby the programmable divider 31 sets the source clock to 1 /. Bust to 7. The final output signal of the programmable divider 31 is input to the channel rising clock generator 33 through the feedback value selector 32.

That is, the feedback value applied from the feedback value selector 32 is used as the load value in the programmable divider 31, so that the channel increment unit value can be selected from 1 to 147 when 147 is selected. In addition, when the feedback value is selected as 7, the channel increment unit value can be used as 1 to 7. That is, the number of channels provided to the user may be used as 1 to 147 in the 147 channel mode and 1 to 7 in the 7 channel mode.

4 is a diagram illustrating respective reference clocks generated when the feedback value is 147 and when the channelizing apparatus according to the present invention is 147, and in FIG. 4, (a) is a timing diagram showing an entire time slot, and (b). ) Denotes a reference clock generated for all timeslots generated when the feedback value is 147, i.e., in 147 channel mode, and (c) shows the reference clock generated when the feedback value is 7, i.e., in 7-channel mode. Indicates.

The total timeslot shown in (a) of FIG. 4 represents the total capacity of the transmission data that can be transmitted through the corresponding frequency band (that is, 44,746,000 Hz). When the feedback value is 147, channels 1 to 147 are represented. It is designed as follows.

That is, the channel frequency Where N is a feedback value of 1 to 147. Therefore, when N = 1, the channel frequency is 300.7 KHz, and when N = 147, the channel frequency is 44,2 MHz. Therefore, each time N is increased, the low section of the channelizing clock is increased proportionally.

At this time, the width of the row section is determined by the feedback value. In the above example, when the feedback value is 147, it is 300KHz, and when the feedback value is 7, the width is 6,312KHz according to the calculation method.

The reference clock as described above is applied to the channel rising clock generating unit 33, and the channel rising clock generating unit 33 combines the number of channels input by the user, thereby converting the digital data input at the time of multiplexing and demultiplexing. A channel rising clock as a reference for inserting / extracting data channels in a T3 frame is generated.

That is, the channel rising clock output from the channel rising clock generator 33 is input to the CSU 23 and used for synchronous channelizing of digital data.

As described above, the present invention is to implement a T3 level channelizing function for synchronous data service, to provide a faster data service to the subscriber, the number of routers 22 connected to the T3 CSU 23 is Up to seven connections can be made, but FIG. 2 shows a configuration in which routers 22 of a generation are connected.

In addition, the channelizing clock provided from the channelizing unit 21 is used as a system clock in the router 22, and the digital data sent by the router 22 is a time slot selected by the CSU 23. Multiplexed to

Assuming that the data rate that can be serviced to the DS3 level signal is 100, the channelizing unit 21 generates a channel rising clock by the user's selection. If only one router is used, all the channels 1 to 100 can be used. In the case of using two routers, the two routers can be used in a random range within the range of 100, and synchronous transmission is possible.

As described above, the present invention provides a variety of channelizing of digital data to a voice level T3 signal, thereby providing a faster data service, and also makes it compatible with existing T3 level signals to increase network operability. In terms of the user side, various channelizing is possible, thereby increasing the convenience of operation.

Claims (2)

A synchronous channelizing apparatus for digital data for generating a channel rising clock as a reference for inserting / extracting a plurality of digital data into a channel portion of a T3 frame, Programmable dispensing means for dividing and outputting the source clock at a division ratio corresponding to the input feedback value; Feedback value selection means for applying a feedback value corresponding to the division ratio of the programmable division means to the programmable division means according to a channel mode selected by the user and outputting the divided clock signal output from the programmable division means as a reference clock; And a channel rising clock generating means for receiving a reference clock output through the feedback value selecting means and generating a channel rising clock corresponding to the number of channels selected by the user. In a T3-class channel service unit using a synchronous channelizing device for synchronously channelizing DS2 digital data transmitted from a DS2-class device, A channel rising device unit for generating a channel rising clock indicating a point of insertion / extraction for each channel in all available timeslots according to a channel mode and number of channels selected by a user; According to the channelizing clock input from the channelizing device unit, the CSU unit for multiplexing or demultiplexing by inserting / extracting DS2 signals transmitted from one or more DS2 class devices into the channel portion of the T3 frame T3 channel service unit using a synchronous channelizing device for data.