Method for transmitting signalling information via out-of-band communication channel in optical communications network

A method for transmitting signalling information via an out-of-band communication channel in an optical communications network comprising a master device and slave devices connected to the master device via optical fiber, the signalling information containing identifying information aiming at identifying the slave device transmitting said signalling information, the optical communications network being adapted to enable in-band communications, the out-of-band communication channel being intended to enable transmissions of said signalling information with respect to the in-band communications, collisions occurring in the out-of-band communication channel when plural slave devices access the out-of-band communication channel by using respective carrier wavelengths that match each other, wherein each slave device receives, from the master device, information representative at least of a mask that said slave device has to apply to a full identifier of said slave device so as to obtain reduced identifying information to be used by said slave device within further signalling information to be transmitted by said slave device, the reduced identifying information aiming at containing enough bits according to said mask to enable distinguishing said slave device from the other slave devices likely to concurrently access the out-of-band communication channel,

• wherein each slave device further transmits, via the out-of-band communication channel, a so-called announcing signalling information, and each slave device receives said information representative at least of said mask, in response to said announcing signalling information,
• and wherein, when the in-band communications are setup from one said slave device to said master device, said slave device transmits the full identifier of said slave device within said in-band communications so as to enable the master device replacing identifying information that enables discriminating said slave device from other slave devices likely to concurrently access the out-of-band communication channel and that was then previously stored by the master device, by the full identifier of said slave device.

A master device adapted to receive signalling information via an out-of-band communication channel in an optical communications network further comprising slave devices connected to the master device via optical fiber, the signalling information containing identifying information aiming at identifying the slave device transmitting said signalling information, the optical communications network being adapted to enable in-band communications, the out-of-band communication channel being intended to enable transmissions of said signalling information with respect to the in-band communications, collisions occurring in the out-of-band communication channel when plural slave devices access the out-of-band communication channel by using respective carrier wavelengths that match each other, wherein the master device implements a transmitter, to each slave device likely to concurrently access the out-of-band communication channel, for transmitting information representative at least of a mask that said slave devices have to apply to respective full identifiers of said slave devices so as to obtain respective reduced identifying information to be used by said slave devices within further signalling information to be respectively transmitted by said slave devices, the reduced identifying information for each slave device aiming at containing enough bits according to said mask to enable distinguishing said slave device from the other slave devices likely to concurrently access the out-of-band communication channel,

• wherein the master device further implements means for receiving, via the out-of-band communication channel, a so-called announcing signalling information, and means for transmitting said information representative at least of said mask, in response to said announcing signalling information,
• wherein, when the identifying information contained in said announcing signalling information enables discriminating said slave device from other slave devices likely to concurrently access the out-of-band communication channel, the master implements means for storing said identifying information,
• and wherein when the in-band communications are setup from said slave device to said master device, the master device implements means for receiving the full identifier of slave device within said in-band communications and means for replacing the stored identifying information by the full identifier of said slave device.

A slave device adapted to transmit signalling information via an out-of-band communication channel in an optical communications network further comprising a master device and other slave devices also connected to the master device via optical fiber, the signalling information containing identifying information aiming at identifying the slave device transmitting said signalling information, the optical communications network being adapted to enable in-band communications, the out-of-band communication channel being intended to enable transmissions of said signalling information with respect to the in-band communications, collisions occurring in the out-of-band communication channel when plural slave devices access the out-of-band communication channel by using respective carrier wavelengths that match each other, wherein said slave device implements a receiver, from the master device, for receiving information representative at least of a mask that said slave device has to apply to a full identifier of said slave device so as to obtain reduced identifying information to be used by said slave device within further signalling information to be transmitted by said slave device, the reduced identifying information aiming at containing enough bits according to said mask to enable distinguishing said slave device from the other slave devices likely to concurrently access the out-of-band communication channel,

• wherein said slave device further implements means for transmitting, via the out-of-band communication channel, a so-called announcing signalling information, and said slave device receives said information representative at least of said mask, in response to said announcing signalling information,
• and wherein, when the in-band communications are setup from said slave device to said master device, said slave device implements means for transmitting the full identifier of said slave device within said in-band communications so as to enable the master device replacing identifying information that enables discriminating said slave device from other slave devices likely to concurrently access the out-of-band communication channel and that was then previously stored by the master device, by the full identifier of said slave device.