Sony PCS-1600 Operating Instructions Manual page 46

Checking the Connection Status
To close the Communication Status menu
Select End with the joystick on the Remote Commander, then
press the joystick. The menu returns to the Setup menu.
On elapsed time
When you set Time Display to On in the General Setup menu,
the elapsed time appears on the monitor screen during a
meeting. You can use it as a guide, and it is convenient for
checking communication costs. If you do not need to display
the elapsed time, set Time Display to Off.
For details on the Time Display setting, see "General Setup
menu" on page 98.
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Chapter 2 Basic Operation During a Meeting