Power-down alarm transmission method of compact synchronous digital transmission equipment

Abstract

The present invention provides transmission method of power-fail alarm of compact type synchronous digital transmission equipment which is realized by electric power monitoring chip of compact type synchronous digital transmission equipment in light circuit unit, programmable logic device, frames chip and optical module. Electric power monitoring chip of first compact type synchronous digital transmission equipment in light circuit unit real-time monitors actual working volt values of power-supply module, electric power monitoring chip outputs alarm to programmable logic device when magnitude of voltage is below threshold value; programmable logic device writes alarm information into idle spending bit, forming synchronous digital transmission frames by synchronous digital transmission frames chip, and synchronous digital transmission frames are send out by light path after electrical signal is converted into light signal by optical module; light circuit unit of second compact type synchronous digital transmission equipment tests alarm information from received synchronous digital transmission frames by optical fiber connecting; when power-fail alarm information is tested, if nonluminous alarm information is received, power-fail of first compact type synchronous digital transmission equipment can be judged.

Description

technical field [0001] The invention relates to a transmission method of a compact synchronous digital transmission device power-off alarm. Background technique [0002] The optical synchronous digital transmission network is composed of some synchronous digital transmission (SDH) network elements, and performs synchronous information transmission, multiplexing and cross-connection on optical fibers. It has a unified network node interface (NNI) throughout the world, which simplifies the intercommunication of signals and the transmission, multiplexing, cross-connection and switching processes of signals. The network established by synchronous digital transmission is a highly unified, standard and intelligent network, and realizes the horizontal compatibility of equipment, so that every user in the world can communicate conveniently anytime and anywhere. Synchronous digital transmission technology has become the preferred technology for telecom operators in the world today. ...

AI Technical Summary

Problems solved by technology

When one end of the synchronous digital transmission equipment is powered off, the data communication channel is interrupted, and the power-down equipment cannot be monitored, and the optical line unit in the other end of the synchronous digital transmission equipment connected to it by optical fiber will have a no-light alarm. The no-light alarm may also be caused by the failure of the optical line unit or the damage of the optical cable, so the cause of the fault cannot be judged only by receiving the no-light alarm

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