CN1235441C - Semi permanent connection method of time division multiplex time gap in digital cross connection equipment - Google Patents

Abstract

The invention discloses a semi-permanent connection method in a digital cross-connect device. In the method, a time slot switching bus interface unit and a time slot swap bus. When the time slot is exchanged, the signal of the access signal interface unit that contains the time slot signal that needs to be converted is converted into a switching network bus (HW) signal, and the HW signal is converted into a time slot signal through the time slot exchange bus interface unit, and then The above time slot signals are sent to the time slot exchange bus to complete the required time slot exchange, and the exchanged result time slot signals are converted into HW signals through the corresponding time slot exchange bus interface unit and sent to the corresponding time slot link processing unit for processing ; This method is conducive to improving the integration degree and resource utilization efficiency of the whole system, and is simple to implement and low in cost.

Description

A semi-permanent connection method for time-division multiplexing time slots in digital cross-connect equipment

technical field

The present invention relates to the connection method of time division multiplexing time slot (TDM) inside digital cross connection equipment (DXC, Digital Cross_ConnectionEquipment).

Background technique

A digital cross-connect (DXC) device is a physical layer device that realizes channel bifurcation and multiplexing between different interfaces in a circuit-switched network. Usually, a DXC device can realize zero-order group, primary group, secondary group, tertiary group, and quaternary group. Multiplexing and demultiplexing of digital signals.

In a common signaling transfer point STP (Signaling Transfer Point, signaling transfer point) system, the DXC device completes the demultiplexing and multiplexing functions of signaling messages in the relay system, and the signaling messages are distributed in the form of packets It is processed in the link processing unit (LPU, Link Process Unit) of the DXC device, and the routing exchange between the devices is completed through the high-speed frame exchange platform. The DXC device implements the above-mentioned routing and switching functions through the semi-permanent connection mode of time division multiplexing (TDM) time slots. The DXC device is set through the data configuration in the background to ensure that the channels of each office direction are fixedly connected to their specific LPUs. Each LPU can complete the processing of the corresponding link.

The semi-permanent connection method is the most important way for DXC devices to connect to signaling links. It has the characteristics of strong controllability and flexible networking, and it can realize bidirectional connections between various devices. Semi-permanent connection refers to the connection between two users without a fixed physical channel. Due to the demand of data services or the special needs of users, a long-term connection is established between two users. The connection is usually established by the computer room. The maintenance personnel can be set on the switch side through man-machine commands.

When the two time slots participating in the exchange are in the same device, you only need to exchange the time slot to the corresponding time slot through the time slot exchange unit in this device, for example: to complete the No. 5 time slot in the same device When exchanging data with No. 9 time slot, the exchange schematic diagram is shown in Figure 1. The arrowed line indicates the data flow direction, that is, No. 5 time slot in the device is processed by the time slot exchange unit and then switched to No. 9 time slot Then send it to the corresponding LPU for processing, thus completing the time slot exchange in the same device, which is the semi-permanent connection of TDM time slots in the device.

The above-mentioned DXC equipment can better realize the semi-permanent connection of the TDM time slot in the DXC equipment, but since DXC is a relatively large-scale special equipment, an additional set of DXC equipment needs to be added to the system, which reduces the integration of the system and improves At the same time, because the DXC device can realize the semi-permanent connection of TDM time slots between devices and within the device, when only using this device to realize the semi-permanent connection of TDM time slots in the device, the utilization rate of device resources will inevitably be reduced .

Contents of the invention

The purpose of the present invention is to provide a semi-permanent connection method for time-division multiplexing time slots in a digital cross-connect device, which can improve system integration and resource utilization.

In order to achieve the above object, the semi-permanent connection method of the time division multiplexing time slot in the digital cross-connect device provided by the present invention includes:

Step 1: setting a time slot exchange bus interface unit and a time slot exchange bus between the signal interface unit and the time slot link processing unit in the DXC device;

Step 2: Convert the signal of the access signal interface unit containing the time slot signal that needs to be converted into a switching network bus (HW) signal, and the HW signal is converted into a time slot signal through the time slot switching bus interface unit, and then the above time The slot signal is sent to the time slot exchange bus;

Step 3: The time slot exchange bus interface unit corresponding to the exchange result time slot extracts the time slot signal to be converted from the time slot exchange bus, and binds the above signal to the result time slot to form a result time slot signal. The above result The time slot signal is converted into a HW signal through the corresponding time slot exchange bus interface unit, and sent to the corresponding time slot link processing unit for processing.

Because the present invention adopts the method that the time slot exchange bus interface unit and the time slot exchange bus are arranged between the signal interface unit in the DXC and the time slot link processing unit to realize the semi-permanent connection of the TDM time slot in the DXC equipment, and the original Compared with the semi-permanent connection method of the TDM time slot, the semi-permanent connection of the TDM time slot in the device is realized by the time slot exchange bus, which will improve the integration degree and resource utilization efficiency of the whole system, and the implementation is simple and low in cost.

Description of drawings

Fig. 1 is a block diagram of realizing the semi-permanent connection of TDM time slots in the DXC equipment applying the existing method;

Fig. 2 is the block diagram of the first embodiment of applying the method of the present invention;

Fig. 3 is a block diagram of a second embodiment of applying the method of the present invention.

Detailed ways

With the continuous development and improvement of the time slot exchange bus, many TDM (Time Division Multiplex, time division multiplexing) time slot exchange functions can be realized on the time slot exchange bus. Currently, the more widely used time slot exchange bus (or Time division multiplexing bus) mainly includes CT (Computer Telephony, computer telephony technology) bus, which includes MVIP-90 (MVIP, Multi-Vendor Integration Protocol, multi-vendor interconnection protocol), SC-BUS, H.100/H.110 Bus (or called H-BUS) and so on. The present invention is to use the time slot exchange bus to realize the semi-permanent connection function of the TDM time slot in the equipment of DXC (Digital Cross_Connection Equipment, digital cross connection equipment), specifically to use the time slot exchange function of the time slot exchange bus to replace the digital cross connection equipment DXC's time slot exchange function completes the semi-permanent connection of TDM time slots in the device.

Taking the H.110 bus as the time slot exchange bus and the E1 signal interface unit as an example, the present invention will be further described in detail with reference to the accompanying drawings.

Referring first to FIG. 2 , FIG. 2 is a block diagram of a first embodiment of applying the method of the present invention. In Fig. 2, the signal interface unit described in the present invention is the E1 interface chip on E1 interface unit #1 and E1 interface unit #2, and the time slot link processing unit is link processing unit #1 and link processing unit # 2. A time slot exchange bus interface unit and a time slot exchange bus are arranged between the signal interface unit and the time slot link processing unit. In Fig. 2, the time slot exchange bus interface unit is the H.110 interface chip on the E1 interface unit #1 and the E1 interface unit #2, and the time slot exchange bus is the H.110 bus. In practical applications, the H.110 bus can be set on the backplane of the device. In the DXC equipment shown in Figure 2, the time slot switching part of the entire equipment is mainly composed of multiple E1 interface unit boards and link processing unit boards. Based on the above settings, when performing signal conversion, the signal of the access signal interface unit that contains the time slot signal that needs to be converted is converted into a switching network bus (HW) signal, and the HW signal is converted into a time slot through the time slot switching bus interface unit Then send all the above time slot signals to the time slot exchange bus to complete the required time slot exchange, and convert the exchanged result time slot signals into HW signals through the corresponding time slot exchange bus interface unit and send them to the corresponding time slots Link processing unit processing. The time slot exchange described here is completed on the time slot exchange bus. The time slot exchange bus interface unit of the exchange result time slot extracts the time slot signal that needs to be converted from the time slot exchange bus, and then combines the above signal with the result Slot bonding to form the resulting slot signal.

Taking the time slot conversion shown in Figure 2 as an example, assuming that the exchange of time slot No. The No. 1 time slot is processed by the E1 interface unit #1 board, and the No. 9 time slot is processed by the E1 interface unit #2 board. Then, the E1 signal connected to the E1 interface unit #1 board contains a signal that needs to convert the time slot signal. After the E1 interface chip of this board is converted into the switching network bus (HW, High Way) signal, and then the time slot conversion is completed through the H.110 interface chip on this board, all 32 time slots of the E1 signal will be sent to On the H.110 bus, the E1 interface unit #2 board extracts the corresponding No. 5 time slot from the H.110 bus, binds the signal of the No. 5 time slot to the No. 9 time slot, and then passes the H.110 interface chip It is converted into HW signals and sent to the link processing unit board corresponding to the E1 interface unit board, that is, the link processing unit #2 in Figure 2 for link processing. In this way, the conversion from the 5# time slot to the 9# time slot is completed. The data flow direction of the above time slot conversion is:

E1 signal → E1 interface chip of E1 interface unit #1 → HW signal → H.110 interface chip of E1 interface unit #1 → H.110 bus → H.110 interface chip of E1 interface unit #2 → HW signal → link Handling unit #2.

Taking the H.110 interface chip on the E1 interface unit board as an example, the H.110 interface chip model ML53812 is used as an example to introduce the semi-permanent connection scheme of the TDMM time slot in the device in detail. Refer to Figure 3.

The local side of the H.110 interface chip ML53812 shown in Figure 3 can provide access to 8 2Mbps HW signals, or 4 4Mbps HW signals, or 2 8Mbps HW signals on the H.110 bus side Can provide 32 8Mbps data lines (CT_D). ML53812 can complete the exchange of 512×4096 time slots on the local side and the H.110 bus side, including 256×4096 time slots in the receiving and sending directions, and the sending and receiving exchange time slots are independent.

In the device shown in Figure 3, the four E1 signals input by the E1 interface unit board are used as a group, and one 8Mbps HW signal is output through the E1 interface chip to reach the local side of the ML53812. By configuring the sending register of the ML53812, the ML53812 can transmit this All the 128 time slots of the HW signal are switched to any of the 128 time slots of any one of the 32 8Mbps CT_D data lines of the H.110 bus.

Assume that the jth time slot among the 128 time slots of an 8Mbps HW signal entering on the i-th E1 interface unit board (the corresponding link processing unit board is the i-th block), is determined by the H. The 110 interface chip ML53812 is switched to the kth time slot of the i-th data CT_D[i] of the H.110 bus, and the k-th time slot cannot be processed by the corresponding i-th link processing unit board, and needs to be sent to other The link processing unit board performs processing (assuming it is the first link processing unit board, and the corresponding E1 interface unit board is the first one). Then, the CPU (Center Process Unit, central processing unit) on the first E1 interface unit board is controlled by the system board through command mode, and the receiving configuration register of the H.110 interface chip ML53812 on the E1 interface unit board is configured by the CPU , switch the Kth time slot of the data line CT_D[i] to the mth time slot of a certain HW on the local side of the ML53812 according to the set switching rules, and then send it to the first link processing unit board for processing . In this way, the exchange from the i-th time slot to the m-th time slot is completed.

The data flow direction of the above time slot conversion is:

4-way E1 input → E1 interface chip of the i-th E1 interface unit board → the jth time slot on the Local side of the H.110 interface chip → the kth time slot of the data line CT_D[i] of the H.110 bus → the 1st time slot The H.110 side of the H.110 interface chip on the first E1 interface unit board → the mth time slot of the HW signal on the Local side of the H.110 interface chip on the first E1 interface unit board → arrives at the first link processing unit plate handling.

In a word, all time slots of each E1 interface unit board are input to the H.110 bus to realize the intercommunication of all time slots of all E1 interface unit boards, and each E1 interface unit board can be configured from the H.110 bus according to the software configuration. The required time slots are taken out of the 4096 time slots on the bus and sent to the corresponding link processing unit board for processing. The information processed by the link processing unit board is returned to the designated E1 path. In this way, the method for implementing the time slot exchange function of the DXC device on the H.110 bus is realized, that is, the semi-permanent connection of the TDM time slots in the device is realized on the H.110 bus.

Claims (3)

1. A semi-permanent connection method for time-division multiplexing time slots in a digital cross-connect device, comprising: Step 1: setting a time slot exchange bus interface unit and a time slot exchange bus between the signal interface unit and the time slot link processing unit in the digital cross-connect device DXC; Step 2: Convert the signal of the access signal interface unit containing the time slot signal that needs to be converted into the bus HW signal of the switching network, and the HW signal is converted into a time slot signal through the time slot switching bus interface unit, and then the above time slot signal is sent to to the time slot exchange bus; Step 3: The time slot exchange bus interface unit corresponding to the exchange result time slot extracts the time slot signal to be converted from the time slot exchange bus, and binds the above signal to the result time slot to form a result time slot signal. The above result The time slot signal is converted into a HW signal through the corresponding time slot exchange bus interface unit, and sent to the corresponding time slot link processing unit for processing. 2. The semi-permanent connection method for time-division multiplexing time slots according to claim 1, characterized in that: the signal interface unit is a European standard PCM primary link (E1) interface unit. 3. The semi-permanent connection method of time division multiplexing time slots according to claim 1, characterized in that: the time slot exchange bus is a computer and telephone CT bus.

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