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assignments are required. Each net can be made up of automatic authentication table.
10 common subscribers (a section or platoon for
example). Team and broadcast identifiers must be
included in a subscriber net for the ATHS to recognize 4-95. ATHS INITIALIZATION.
them, i.e., team and broadcast cannot be entered on Initialize the ATHS as follows:
Start page 1/2 until defined in the subscriber nets. The
originator is automatically in all of the defined 1. ATHS switch  Press as required to display
subscriber nets. A TACFIRE subscriber must be in a ATHS Top Menu page (Fig. 4-67).
TACFIRE net. As the message originator, a subscriber
from any defined net may be selected and ATHS will
2. START key  Press.
automatically set to that net data. However, a
subscriber using another set of net data would not be
able to establish contact without resetting net data to 3. Paging (1/2) key  Press.
match the originator. Should SUB appear, it signifies
that the subscriber selected as the destination is not 4. TEST key  Press. Enter a T using MFK; GO
defined in the subscriber list. or NO GO will display on MFD.
(3) Authentication. Automatic authentication 5. NETS key  Press to access and complete
tables are accessed from this page. There are two Net Data pages. Enter prompts as follows:
tables, one transmit and one receive, that hold 100
authentications each. In the event the number of a. TFR AIR NET key  Press to scroll type or
authentications remaining reaches 20 or less, the net desired adjacent to NET number.
advisory message ATH TABLE LOW will display on the
MFD. This must be loaded prior to each mission if they b. BLK key  Press to scroll between SGL
have been depleted or the SOI has changed. As an and DBL. Leave as desired.
authentication is used, it is automatically deleted and
the computer steps to the next code. The table can c. BAUD key  Press to select desired baud
only be used on nets that have been selected as NONE rate.
on the authentication select on the Net Parameter
page. If, when using automatic authentication, usually d. RADIO key  Press to select radio which
only with TACFIRE, the transmit or receive line will be used for transmitting and receiving.
sequence becomes incorrect, transmission of an
authentication synchronization message is required e. S key  The time required to transmit will
(see MSG/FREE TEXT). By transmitting this message, display.
the TACFIRE operator can see the anticipated next
table line and adjust the computer. A not acknowledged f. PRE key  Press to access Preamble Entry
(NAK) will appear; however, momentarily normal digital page and press PREAMBLE  SEC key.
communication s h o u l d be r e s t o r e d w i t h t h e Enter desired preamble length of 0.1 to 4.0
authentication tables in proper sequence. seconds using MFK.
(4) Preset Messages. There are six preset free
text messages that can be programmed prior to the NOTE
s t a r t of a mission to aid i n response time f o r
transmissions. There are six preset movement L-3 (OFF) can be pressed to disable monitor
packages that can be programmed for establishing function.
phase lines, assembly areas, FARP locations, etc.
These 6 preset movement messages consist of 2 lines g. MON key  Press if required to access
of 15 characters each for a total of 30 characters. Monitor Entry page and press MONITOR 
SEC key. Enter time of from 0.5 to 9.9
(5) BULK Data Load. Bulk data load can be seconds using MFK.
used by a team member who did not preprogram the
ATHS prior to flight or for an ATHS that needs to be h. AUTH key  Press to scroll between
reprogrammed while in flight. The data that can be bulk MANUAL or NONE.
loaded from another ATHS consists of: subscribers/
nets, preset messages, preset movement messages,
4-123
TM 1-1520-248-10
i. NETS  Set up each of the eight pages as
required f o r each net to be used by
repeating steps a. through h.
j. Paging key  Press as required to return to
Start page 2/2.
6. SUBS key  Press and proceed as follows:
a. NET 1, NET 2 and/or NET 3 keys(s) 
Press as desired to activate desired net and
enter subscriber identifier(s).
b. Paging key  Press as required to access
subpages and enter identifiers. Page
through 3/3 to return to Start page.
NOTE
NETS can be reviewed off SUBS page by
pressing the adjacent R key.
7. AUTH key  Press and proceed as follows:
a. SUBS key  Subscriber is displayed or
press key and enter desired subscriber
using MFK.
b. X M T L I N E  C u r r e n t t r a n s m i t
　
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