US 5,212,578 A · Selection of transmission facilities using optical wavelength division multiplexing

Abstract

A duplicated transmission system in which two optical wavelengths are utilized on each of a pair of optical links with one optical wavelength communicating data and the other optical wavelength communicating a signal designating an active optical link of the pair. Each of the optical links is terminated on a transmit unit and a receive unit. The two transmit units determine which of the optical links is the active optical link, and each of the transmit units then transmits a signal on the second wavelength of the terminated optical link indicating this decision. The second wavelength of the active optical link designates that it is active, and the second wavelength of the standby optical link designates that it is the standby optical link. Upon reception of the information on the second wavelengths, the receive units both select the active optical link.

Claims10

Dependent claims

An apparatus for controlling a duplicated transmission system comprising:

a first and second optical link with the first optical link interconnecting a first transmit means and a first receive means and the second optical link interconnecting a second transmit means and a second receive means;
the first and second transmit means transmitting on the first and second optical links, respectively, data using a first optical wavelength and a control signal using a second optical wavelength;
and
the first and second receive means each responsive to control signal communicated by the second optical wavelength of the first optical link and the control signal communicated by the second optical wavelength of the second optical link for selecting the first optical wavelength from the first optical link or the first optical wavelength from the second optical link.

1 more element

A method for controlling a duplicated transmission system having a first and second optical link with the first optical link interconnecting a first transmitter and a first receiver and the second optical link interconnecting a second transmitter and a second receiver, comprising the steps of:

transmitting on the first and second optical links, respectively, data using a first optical wavelength and a control signal using a second optical wavelength;
and
selecting by the first and second receivers the first optical wavelength from the first optical link or the first optical wavelength from second optical link in response to the control signal communicated by the second optical wavelength of the first optical link and the control signal communicated by the the second optical wavelength of the second optical link.

Dependencies are inferred from the claim text.

Selection of transmission facilities using optical wavelength division multiplexing

Life of this patent

Selection of transmission facilities using optical wavelength division multiplexing

Life of this patent

Abstract

Claims10