User's Manual

APPLICANT: MOTOROLA, INC. FCC ID: IHDT6AC1

Exhibit 8

5.1.3 How / When to make the unit to wakeup.

If the D15 will have no accessories and the unit is camped the

D15 will go to a "sleep mode" (current save mode).

During this period of time the RS232 is not responding to any

command from the DTE device.In order to make the unit to wake

up when the DTE will like to communicate with the radio the

user have two options:

1. Activate the RTS During all the DTE/DCE dialog. (Internaly

the TS line will be activated). After the communication

disable the RTS in order to go back to sleep mode.

2. Activate the TS During all the DTE/DCE dialog. After the

communication disable the TS in order to go back to sleep

mode.

Note: If the RTS or TS line will be active all the time the

unit will not switch to Sleep mode and the avarage current

consumption without a call will be arround 50mA.

Timing diagrams should be added. - TBD

5.2 Audio circuits consideration.

The D15 is able to make a voice call as well as Data calls.

In voice calls the audio can be routed in a few channels:

Digital audio chanel - Audio is sent via the DSC bus.

Analog audio channel - Drived externaly to audio devices.

Analog audio channel in Hands free mode - D15 sens the

audio out with the Echo canceling ON in the DSP, External

drivers are required.

The Selection between each one of the channels can be done

according to the table XX in paragraph 4.3.2.