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Digital user unit and digitalized S/T interface

A digital user and interface technology, applied in the direction of electrical components, radio/induction link selection and arrangement, network topology, etc., can solve the problems of high cost, poor reliability, complex circuit, etc., achieve low cost, stable performance, and improve overall performance The effect of the indicator

Inactive Publication Date: 2007-02-28
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Common applications from the U port chip of NT1 to the S / T chip of TE (terminal equipment, terminal equipment) 1 are all analog circuits, and there are transformers, the circuit is complicated, the cost is high, and the reliability is poor.

Method used

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  • Digital user unit and digitalized S/T interface
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  • Digital user unit and digitalized S/T interface

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Embodiment Construction

[0033] The application block diagram of the digital subscriber unit (DSU) in the PHS base station of the present invention is shown in FIG. 3 .

[0034] The unit is mainly composed of three parts: U interface circuit, CPLD circuit, and drive circuit.

[0035] The U interface circuit mainly completes the connection with the line terminal through the ISDN twisted pair. The U interface circuit outputs the standard GCI (general circuit interface, general circuit interface) signal to the CPLD circuit to complete the digital S / T interface. Finally, the 2B+D signal B channel, D channel and C / I (command / indication, command / indicator) channel signals are extracted and sent to the terminal equipment.

[0036] The U interface circuit realizes the communication handshake and information transmission between the LT and NT1 between the network and the base station.

[0037] In the design, Infineon's PEF2091N chip is used as the U-port chip, combined with peripheral circuits to complete two...

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Abstract

The invention relates to a digit user unit used in personal hand-held phone base station and a digit S / T interface of ISDN used in embedded system. Wherein, the digit user unit comprises U interface circuit, complex programmable logic circuit, and driving circuit, while the U interface circuit and the wire terminal via ISDN twisted-pair line are connected; the U interface circuit outputs standard GCI signal to the complex programmable logic circuit to complete digitizing the S / T interface and extract the B channel, D channel and C / I channel signals of 2B+D signal to be sent to the terminal device via driving circuit. Since it replaces general S / T chip, analogue circuit and transformer, it has simple hardware, controllable time sequence, reduced cost, improved PHS base station reliability and improved network quality.

Description

technical field [0001] The invention relates to the design of an ISDN digital S / T interface circuit applied to an embedded system, mainly relates to the digital design of the user U port transceiver in ISDN in the communication field, and can be widely used in the communication field and the integrated service digital network (ISDN) related communication systems, such as PHS (Personal Handyphone System, Personal Handyphone System) core equipment PHS base station user interface circuit. Background technique [0002] The ISDN reference model is shown in Figure 1: [0003] This is a general model applicable to various ISDN applications. The figure shows the position of the U reference point between the line terminal (LT, line terminal) and the network terminal (NT, network terminal) 1 in the model. This point is the physical access point of ISDN. This interface is a twisted-pair wire pair and supports full-duplex digital signal transmission at a rate of 160kbit / s. [0004] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/30H04W84/14
Inventor 孟朝华何喜文杨志鹏
Owner ZTE CORP