Communication apparatus, a communication arrangement and a communication method

1. A communication apparatus for push-to-talk communication over a professional mobile radio, the apparatus comprising:

a control portion for controlling the push-to-talk communication, the control portion connectable to a microphone and to a loudspeaker and comprising a first optical transceiver portion configured to

convert an optical downlink signal into an electrical downlink audio signal for presentation to a user via said loudspeaker, and

convert an electrical uplink audio signal received from said microphone into an optical uplink signal for provision to an interface portion;

two or more separate interface portions, and

two or more separate and dedicated bi-directional optical links for connecting the control portion to a respective one of the two or more interface portions,

wherein each interface portion is connected to the control portion by a respective one of said two or more separate and dedicated bi-directional optical links, each interface portion connectable to a respective one of two or more radio portions by a respective electrical connection, which radio portion enables communication with one or more remote communication apparatuses via a respective wireless communication link over one or more communication channels, each interface portion comprising a respective second optical transceiver portion configured to

convert a downlink signal received from the respective radio portion as an electrical signal into said optical downlink signal for provision to the control portion, and

convert said optical uplink signal into an electrical uplink signal for provision to the respective radio portion.

2. The apparatus according to claim 1 , wherein said downlink and uplink signals comprise audio signals.

3. The apparatus according to claim 2 , wherein at least one of said interface portions comprises a first audio processing portion configured to apply radio portion specific audio processing.

4. The apparatus according to claim 3 , wherein said first audio processing portion is configured for adapting characteristics of the electrical downlink audio signal to meet requirements of the control portion, and

adapting characteristics of the electrical uplink audio signal to meet requirements of the respective radio portion.

5. The apparatus according to claim 2 , wherein the control portion comprises a second audio processing portion configured to apply radio portion independent audio processing.

6. The apparatus according to claim 5 , wherein the second audio processing portion is configured for adapting characteristics of the electrical downlink audio signal to meet requirements for an audio signal suitable for presentation to the user, and

adapting characteristics of the electrical uplink signal to meet requirements of the respective optical link.

7. The apparatus according to claim 1 , wherein said downlink and uplink signals comprise signals representing generic data.

8. An apparatus according to claim 1 , wherein said uplink signals comprise control signals, wherein

the control portion is further configured to convert an electrical control signal for controlling transmission of the uplink audio signal into an optical control signal for provision to a radio portion, and

the one or more interface portions are further configured to convert said optical control signal into an electrical control signal for provision to the respective radio portion.

9. The apparatus according to claim 8 , wherein said control signal causes setting the respective radio portion to a transmission mode or to a reception mode.

10. An arrangement for push-to-talk communication over a professional mobile radio comprising an apparatus according to claim 1 and the one or more radio portions, each connected to the respective interface portion by electrical connection.

11. A method for controlling push-to-talk communication over a professional mobile radio using a communication apparatus comprising a control portion for controlling the push-to-talk communication, which control portion is connectable to a microphone and to a loudspeaker and two or more separate interface portions, each interface portion being connected to the control portion by a respective one of two or more separate and dedicated bi-directional optical links, each interface portion connectable to a respective one of two or more radio portions by a respective electrical connection, which radio portion enables communication with one or more remote communication apparatuses via a respective wireless communication link over one or more communication channels, the method comprising:

providing an uplink signal over an optical link, comprising

converting, in the control portion, an electrical uplink audio signal received from said microphone into an optical uplink signal for provision to an interface portion,

providing said optical uplink signal over the respective optical link to an interface portion, and

converting, in the interface portion, the optical uplink signal into an electrical uplink signal for provision to the respective radio portion, and

providing a downlink signal over an optical link, comprising

converting, in an interface portion, a downlink signal received from the respective radio portion as an electrical signal into an optical downlink signal for provision to the control portion,

providing said optical downlink signal over the respective separate and dedicated bi-directional optical link to the control portion, and

converting, in the control portion, said optical downlink signal into an electrical downlink audio signal for presentation to a user via said loudspeaker.

12. The method according to claim 11 , wherein said downlink and uplink signals comprise audio signals.

13. The method according to claim 12 , wherein

providing the uplink signal comprises applying, in an interface portion, radio portion specific audio processing for adapting characteristics of the electrical uplink audio signal to meet requirements of the respective radio portion, and

providing the downlink signal comprises applying, in an interface portion, radio portion specific audio processing for adapting characteristics of the electrical downlink audio signal to meet the requirements of the control portion.

14. The method according to claim 12 , wherein

providing the uplink signal comprises applying, in the control portion, generic audio processing for adapting characteristics of the electrical uplink audio signal to meet requirements for an audio signal suitable for presentation to the user, and

providing the downlink signal comprises applying, in the control portion, generic audio processing for adapting characteristics of the electrical downlink audio signal for an audio signal suitable for presentation to the user.

15. The apparatus according to claim 3 , wherein the control portion comprises a second audio processing portion configured to apply radio portion independent audio processing.

16. The apparatus according to claim 4 , wherein the control portion comprises a second audio processing portion configured to apply radio portion independent audio processing.

17. The method according to claim 13 , wherein

providing the uplink signal comprises applying, in the control portion, generic audio processing for adapting characteristics of the electrical uplink audio signal to meet requirements for an audio signal suitable for presentation to the user, and

providing the downlink signal comprises applying, in the control portion, generic audio processing for adapting characteristics of the electrical downlink audio signal for an audio signal suitable for presentation to the user.