KR20010002105A - Method for interfacing channel of user network interface in a exchange system - Google Patents

Abstract

PURPOSE: A method for interfacing channels of a user network interface in a switching system is provided to make a primary rate interface(PRI) circuit interface an H channel without operating a B channel in a network when a subscriber requests an H channel interfacing process, so as to prevent data losses generated from synchronization disagreements caused by transmission path differences to the network and to interface the H channel as using an existing B channel path. CONSTITUTION: If an H channel interfacing request is generated from a subscriber(400), a primary subscriber control card(PSCC) matches B channels by 6 by 6(410). The PSCC selects a B channel by using a channel number requested by the subscriber(420). The PSCC connects the selected B channel only to a sub-highway(SHW)(430). The PSCC requests a time switch line(TSL) to connect the B channels inputted in the SHW to a consecutive time switch(440). The B channels are converted into logical H channels.

Description

Channel matching method of user network interface in switching system {METHOD FOR INTERFACING CHANNEL OF USER NETWORK INTERFACE IN A EXCHANGE SYSTEM}

The present invention relates to channel matching in a switching system, and more particularly, to a method for matching a B channel to an H channel according to a request of a PRI (Primary Rate Interface) subscriber in a switching system that accommodates an integrated telecommunication network.

Subscriber circuits of Integrated Services Digital Networks (hereinafter referred to as "ISDN") are classified into BRI (Basic Rate Interface), PRI (Primary Rate Interface), BAMI (Basic Access Multiplex Interface), etc. Can be. The ISDN subscriber circuit communicates with the upper processor through a full duplex serial method. For example, the link establishment and call control data generated in the ISDN subscriber circuit is transferred to the upper processor block according to the full duplex serial communication scheme. Therefore, each of the plurality of ISDN subscriber circuits is required to be designed in the form of transmitting and receiving data with the upper processor by sharing serial data and control signals with other adjacent boards.

On the other hand, ISDN defines services with various kinds of transmission speeds, and for this, channels with various bandwidths are required. Channels for delivering digital signals and digital data information from the subscriber station to the ISDN switch have different capacities depending on the application. ITU-T defines three types of interface channels: B channel, D channel, and H channel.

The ISDN access channel has a transmission structure combining B, D, and H channels. Generally, BRI subscribers have 2B + D and PRI subscribers have E1 (Europe), and 30B + D is T1 (North American). Has 24B + D. The B channel is a 64 kbps user information channel and is used in three communication modes: circuit switched, packet switched, and dedicated line. On the other hand, the D channel is a signal channel for transmitting signal information, and is used to transmit low-speed subscriber data for packet switching and telemetry data of about 100bps in addition to call control and subscriber-to-subscriber signal information transmission. The H channel is a high speed data channel for transmitting data at high speed. This H channel is a special channel method of PRI subscribers and corresponds to 6 B channels. Equivalent to 24 channels (384 Kbps), B channel For channels (1536 Kbps) and 30 B-channels There is a channel (1920 Kbps).

Since the access channel of the ISDN can be selected at the request of the subscriber, the subscriber can select and use a channel according to the purpose. Accordingly, the PRI subscriber has 30 B channels in the European way and can use B, 2B, and H channels. However, in the actual subscriber circuit, 30 B channels are matched to the switching system through the E1 interface without the H channel interface. Therefore, since ISDN PRI subscribers have to operate 30 B channels in the network to be actually matched to the H channel, data loss may occur due to synchronization inconsistencies due to transmission path differences from the PRI subscriber circuit to the network.

Accordingly, an object of the present invention is to provide a channel matching method that can prevent data loss due to transmission path difference by matching H channels in an ISDN PRI subscriber circuit in an exchange system.

In order to achieve the above object, the present invention provides a user network interface channel matching method in an exchange system for accommodating a comprehensive information communication network.

A first step of checking whether there is a matching request for an H channel from subscribers connected to the interface;

A second step of matching the B channel according to the H channel type requested by the subscriber when there is an H channel matching request;

And a third process of requesting only the B channels corresponding to the channel number requested by the subscriber among the matched H channels to be connected to the exchange through a path through the same call.

1 is a hardware configuration diagram of a PRI subscriber circuit according to an embodiment of the present invention.

2 is a channel matching control flow chart according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating the configuration of a B-channel elementa in a general primaru rate interface (PRI). FIG.

4 is a diagram illustrating a 2.048Mbps PRI frame structure for explaining an H channel matching relationship according to an embodiment of the present invention.

Hereinafter, a channel matching method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 illustrates a hardware configuration diagram of a PRI subscriber circuit 100 according to an embodiment of the present invention. As shown in FIG. 1, the PRI subscriber circuit 100 is directly connected to a plurality of subscribers. Subscriber board 120 on which 1, .., 6, 7 are mounted, and PSCC (Primary Subscriber Control Card) 110 for performing overall control operations such as status management and call generation monitoring of subscriber circuit 100. It includes. In FIG. 1, a Primary & Multiplex Interface Back Board (PMIB) represents a main board of a subscriber circuit 100, and a SHW (SubHighWay) represents a path of a call in an exchange (not shown). In addition, in FIG. 1, the time switch logic (TSL) 200 represents a time switch in charge of switch control.

Hereinafter, the signal processing in the ISDN PRI subscriber circuit 100 having the above-described configuration will be briefly described. First, D-channel signaling data is transmitted through the D-channel bus through the PSCC 110 and then a DP0,1 (Device Processor). Is sent to 300. Meanwhile, the B channel is transmitted to the TSL 200 through the SHW. On the other hand, the PSCC 110 synthesizes the D-channel signaling data received from DP0,1 300 with the B-channel transmitted from the TSL 200 and sends the D-channel signaling data to the ISDN subscriber through the PRIC 120. Data transmission and reception between the PRIC card of the subscriber board 120 and the PSCC 110 is performed through a serial communication (SC) bus, and a PRIC ID read and a software reset are performed through a line communication (LC) bus. In addition, the PRIC card accommodates two links, respectively, and has a structure capable of accommodating 8 sheets per PMIB sheet.

Hereinafter, the H channel matching method in the PRI subscriber circuit 100 having the above-described configuration will be described in detail with reference to FIGS. 2 to 4.

First, FIG. 2 illustrates a channel matching control flow diagram according to an embodiment of the present invention and is performed by the PSCC 110. FIG. 3 is a diagram illustrating a B-channel elementa configuration of a general PRImaru rate interface (PRI), in which 32 channels are used at an E1 interface of a PRI subscriber, and 0 is used as a frame sync and 16 is used. It is used as D channel and the remaining 30 channels are used as B channel. 4 is a diagram illustrating a 2.048Mbps PRI frame structure illustrated to explain an H channel matching relationship according to an embodiment of the present invention. In FIG. 4, (A), (C), and (E) all show cases where only B and D channels are used, and each of (B), (D), and (F) according to subscriber requirements. It shows the case of channel matching.

Hereinafter, the H channel matching method will be described with reference to FIG. 2. First, the PSCC 110 requests an H channel matching request from a subscriber (in more detail, step 400). If there is a channel matching request, the process proceeds to step 410 and as shown in (A) and (B) of FIG. Match by channel. Accordingly Channel numbers exist from 1 to 5. After that, the PSCC 110 selects the B channel using the channel number requested by the user in step 420. That is, if the channel number requested by the user is 1, B channels 1 to 6 are selected. In operation 430, the PSCC 110 connects only the B channel (numbers 1 to 6) selected by the subscriber to the SHW. In this case, since the SHW is configured in plural, the SHW is connected to the same SHW path. In operation 440, the PSCC 110 requests the TSL 200 to connect the B channels (numbered 1 to 6) input to the SHW to a continuous time switch. Through these processes, the B channels of the subscriber circuit are converted into logical H channels. As an example of such a conversion, B channels 13 to 19 (except channel 16) shown in FIG. 4A are shown in FIG. 4B. Switch to channel 3.

In step 400, If channel matching is required, the PSCC 110 selects 24 B channels as shown in (C) and (D) of FIG. 4. Match by channel. At this time The channel number can be used only once, using the channel number requested by the subscriber (for example, 1), select the B channel (numbers 1 to 24 according to the above example), and use the same SHW as described above. Connect B channel to H channel.

In addition, in step 400, the subscriber If channel matching is required, 30 B-channels are added as shown in (C) and (D) of FIG. Match by channel. Also The channel number can be used only once and select B channel using the channel number requested by the user. Subsequent operations are the same as those mentioned in steps 430 and 440. And Channel matching is only possible when the physical subscriber interface is E1.

Therefore, in the present invention, the H channel can be matched in the PRI subscriber circuit without operating the B channel in the network when the subscriber requests H channel matching.

As described above, according to the present invention, the H channel is matched in the PRI subscriber circuit without the B channel being operated in the network when the subscriber requests H channel matching. In addition to preventing loss, there is an advantage that can match the H channel using the existing B channel pass as it is.

Claims (1)

In the channel matching method of the user network interface in the switching system that accommodates the integrated information communication network, A first step of checking whether there is a matching request for an H channel from subscribers connected to the interface; A second step of matching the B channel according to the H channel type requested by the subscriber when there is an H channel matching request; And a third process of connecting only the B channels corresponding to the channel number requested by the subscriber among the matched H channels to the exchange through a path through the same call.