sdh service phone embedded board

Abstract

The invention provides a talk-back embedding board card used for an SDH. The talk-back embedding board card used for the SDH includes an programmable device FPGA, and a voice thick film circuit, a DTMF transceiver, a drive circuit, a clock circuit and a connector connected with the programmable device FPGA. The voice thick film circuit is connected with the DTMF transceiver and the connector respectively. The connector is also connected with the drive circuit. A telephone line of the voice thick film circuit is connected with an external telephone through a protection circuit. By employing the programmable FPGA, the talk-back embedding board card used for the SDH is high in integration degree, suitable for a condition that a transmitting path is inconsistent with a receiving path in an SDH network and high in response speed, and can intercepts voice data in an optical path without delay. The talk-back embedding board card used for the SDH is self-adaptive to all network structures, low in bandwidth occupancy, flexible in configuration, convenient to upgrade, low in power consumption and small in size, and can monitor current status in real time and perform self-recovery. As a talk-back device, the talk-back embedding board card used for the SDH can be embedded into SDH devices of different specifications.

Description

technical field [0001] The invention relates to communication, in particular to a contact method in an optical synchronous digital transmission network, and more specifically to an SDH equipment service telephone embedded board. Background technique [0002] The ever-changing needs of users for communication have accelerated the application of optical synchronous digital transmission network. It is a new system that organically combines high-speed and large-capacity optical fiber transmission technology and intelligent network technology. It is composed of some SDH network elements. A network for synchronous information transmission, multiplexing and crossover. In the process of laying and debugging the SDH network in the field, operators need a contact method for communication. Therefore, the duty phone function that comes with SDH equipment becomes very necessary. The service phone should meet the characteristics of "fiber-to-fiber and telephone-to" and high reliability....

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the defects of the existing SDH equipment, such as low integration of service telephone circuits, difficulty in adapting to different networks, slow response, etc.

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