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antenna terminal of 60 dB within 10 milliseconds. The Each TDMA frame shall be 32 seconds. Each TDMA frame
receiving function should recover from an instanraneous shall be divided into thirteen equal duration slots as follows:
decrease in RF power at the antenna terminal of 60 dB within
25 milliseconds. a) the first slot of each TDMA fiame shall be reserved for
use by the HFDL ground station sub-system to broadcast
link management data in SPDU packets; and
11.3.2 Physical layer functions
b) the remaining slots shall be designated either as uplink
slots, downlink slots reserved for specific HFDL aircraft
11.3.2.1 FUNCTIONS station sub-systems, or as downlink random access slots
for use by all HFDL aircraft station sub-systems on a
The functions provided by the physical layer shall include the contention basis. These TDMA slots shall be assigned
following: on a dynamic basis using a combination of reservation,
polling and random access assignments.
a) transmitter and receiver control;
b) transmission of data; and
c) reception of data. The HFDL ground station sub-system shall broadcast a
squitter protocol data unit (SPDU) every 32 seconds on each
of its operating frequencies.
11 .3.2.2 TRANSMITTEARN D RECEIVER CONTROL
Note.- Details on the TDMA frame and slot structures,
The HFDL physical layer shall implement the ems- pre-key segment, data struchtres, including the SPDU, are
mitterlreceiver switching and frequency tuning as commanded contained in the Manual on HF Data Link (Doc 9741).
2511 1/04
No. 79
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