User`s guide

SkyTrac Systems Ltd.
Document Rev. 01.007 DOC0102 Page 13 of 23
Restricted Proprietary and Confidential Information
When finished, press the Send button again to hang up. The Activity indicator will go out
when the ISAT hangs up the call. If the ground user hangs up, it may take the Iridium
system a few moments to detect the hang up before the ISAT will automatically end the call.
Once the call ends the menu will return to the previously active menu.
It may take several attempts to connect to the Iridium network when dialling the ISAT from
the ground. If the first attempt fails, try again.
4.2.5 Dialling DTMF Tones during a Phone Call
The CDU-250 can generate DTMF tones enabling the user to access automated voice
menus. The user will not hear the DTMF tones over the headset; the tones will only be
heard on the receiving end.
DTMF Tones can only be dialled once a phone call is already in progress.
In order to dial a DTMF tone, press the pound key “#” and the desired key to generate a
tone. This sequence must be repeated for each tone desired. For example to send the
DTMF tones for numbers 5768# to an automated menu, press # 5, # 7, # 6 # 8, # #.
Allow the Activity indicator to flash twice between successive digits.
4.2.6 Volume Control
The CDU-250 allows changing the volume only when a call is on progress. The CDU-250
has four volume settings.
During a Call, the volume adjust menu is displayed automatically. To change the volume
during a call, simply press the Up key to increase the volume, or Down Key to lower the
volume.
NOTE: It may take up to 30 seconds for the volume to adjust.
4.3 Email
The CDU-250 supports Email that functions similar to PC based email programs.
4.3.1 Inbox
The Inbox option allows the user to view and read all messages received from the ISAT.
Sub options include: Read, Reply, and Delete.
The CDU-250 can store 25 messages in the Inbox. After that the CDU-250 will
automatically delete the oldest message in the list to make room for new messages.
If installed, the optional external buzzer will sound whenever a new mail message arrives in
the Inbox. The CDU-250 will also display an information message on its screen to alert the
user.