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 TM 11-5895-1847-12&P
0003 00
Call Waiting
A special feature of the CALL WAITING directory allows NO NAME entries to be transferred directly into the DSC
CALL directory. Named entries appearing in the CALL WAITING directory already have their ID numbers listed in
the DSC CALLING directory. The transfer is accomplished by giving the ID number a name. This feature eliminates
the inconvenience of obtaining, recording, and manually entering the information. Also, keep in mind calls are not
logged into the CALL WAITING directory unless unanswered for 60 seconds.
Searching Directories
The search function allows names in long directory lists to be located quickly. The search function searches for
names, not ID numbers, although numbers may be included in names. To use the search function, one or more
characters of a name are entered. The directory list is searched alphabetically for the first search character. The search
will stop on the first occurrence of the search character. If a name starting with the first character is found and more
than one search character was entered, the search will continue to look for the next character etc. until no further
matches are found. If no occurrences of the first search character are found, then the search will stop at the last name
in the list whose first character's alphabetic rank is lower than the first search character. There is no attempt made to
find a name using the second search character if no name using the first character is found.
DSC Calling
The digital selective call functions of the DSC are divided into four different operating modes. The DSC mode is for
placing individual and group calls and the ANSwer mode is for returning received calls. The TELephone mode is for
placing phone calls and the SCRambler mode is used to keep conversations private. Each mode is tailored for its
particular type of DSC communication.
All DSC calls are automatically sent and received on channel 70. Channel 70 has been designated specifically for
DSC service and must not be used for voice communication. The DSC calling procedure requires the selection of a
working channel prior to making a call. After DSC contact is established on channel 70, the transceiver automatically
switches to the selected working channel for routine communication.
DSC Answering and Call Waiting
The DSC transceiver will receive DSC calls while idle, that is monitoring any channel, or while busy in routine
communications or otherwise available. When idle and monitoring a channel, DSC calls may be answered
immediately. If busy or unavailable, DSC calls are logged into the CALL WAITING directory and may be answered
when convenient. Group calls are logged as the individual initiating the group call. The group ID is not logged.
Geographic Area Calling
The DSC will respond to and generate a geographic area type DSC call. This type of DSC call can be used to contact
a vessel by its location without the need to know its DSC ID. A geographic area is a rectangle that is constructed by a
reference point (latitude, longitude) and two sides defining the number of degrees and minutes for the North-to-South
sides and the West to East side.
Scrambler Mode
The Scrambler mode allows conversation on any working channel to be kept private. Conversation between two, or
more if desired, DSC's will be loud and clear while others who may be monitoring the channel will hear only garble.
Scrambler mode uses the same DSC Calling directories as unscrambled DSC calls. Both individual and group calls
can be scrambled.
0003 00 7
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