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both directions at their nominal rates.
5.2.1 1.4 Integuce rate. The physical interface between
the ADLP and the transponder shall have a minimum bit rate
of 100 kilobits per second.
5.3 DCE AND XDCE STATE TABLES
5.3.1 State table requirements. The DCE and XDCE
shall function as specified in state Tables 5-3 to 5-22. State
Tables 5-15 through 5-22 shall be applied to:
a) ADLP state transitions when the XDCE or XDLP
terms in parenthesis are omitted; and
b) GDLP state transitions when the terms in parenthesis
are used and Lhc XDCE or XDLP preceding them are
omitted.
5.3.2 Diagnostic and cause codes. The table entries for
certain conditions indicate a diagnostic code that shall be
included in the packet generated when entering the state
indicated. The term, "D = ," shall define the diagnostic code.
When "A = DIAG," the action taken shall be to generate an
IS0 8208 DIAGNOSTIC packet and transfer it to the DTE;
the diagnostic code indicated shall define the entry in the
diagnostic field of the packet. In thc causc field of any packet
type, bit 8 of tlie cause field shall always be set to 0,
indicating that the condition was detected by the DTEVDCE
interface. Unless otherwise specified, the clearing cause code
and tlie reset cause code shall be set as specified in IS0 8208.
7/11/96
No. 71
Part I Annex 10 - Aeronautical Telecommunications
Note 1.- The tables provided below specify state requirements
in. the following order:
5-3 DCE special cases
5-4 DTE effect on DCE restart states
5-5 DTE effect on DCE call setup and clearing states
5-6 DTE effect on DCE reset states
5-7 DTE effect on DCE interrupt transfer states
5-8 DTE effect on DCE flow control transfer states
5-9 XDCE effect on DCE restart states
5-10 XDCE effect on DCE call setup and clearing states
5- 11 XDCE effect on DCE reset states
5-12 XDCE effect on DCE interrupt transfer states
5-15 GDLP (ADLP) effect on ADCE (GDCE) packet
layer ready states
5-16 GDLP (ADLP) effect on ADCE (GDCE) call
setup and clearing states
5-17 GDLP (ADLP) effect on ADCE (GDCE) reset
states
5-1 8 GDLP (ADLP) effect on ADCE (GDCE) interrupt
transfer states
5-19 GDLP (ADLP) effect on ADCE (GDCE) flow
control transfer states
5-20 DCE effect on ADCE (GDCE) call setup and
clearing states
5-21 DCE effect on ADCE (GDCE) reset states
5-22 DCE effect on ADCE (GDCE) interrupt transfer
states
Note 2.- All tables specify both ADLP and GDLP actions.
Note 3.- Within the Mode S subnetwork, states p6 and d2
are transient States.
Note 4.- References to "notes" in the stGte tables refer to
table-speciJic notes that follow each state table.
Note 5.- All diagnostic and cause codes are interpreted
as decimal numbers.
Note 6.- An SVC between an ADCE and a GDCE may be
ident$ed by a temporary a d o r permanent channel numbel;
as defined in 5.2.5.1.2.
5.4 MODE $ PACKET FORMATS
5.4.1 Formats. The Mode S packet formats shall be as
specified in Figures 5-3 to 5-22.
5.4.2 Significance of control fields. The structure of the
format control fields used in Mode S packets shall be as
specified in Figure 5-23. The significance of all control fields
used in these packet Formats shall be as follows:
Field
symbol Dejinition
AG Address, Ground; the &bit binary representation
of the ground DTE address (5.2.3.1.3.1)
AM Address, Mobile; the 4-bit binary representation
of the last two BCD digits of the mobile
DTE address (5.2.3.1.3.2)
CC Clearing cause as defined in IS0 8208
CH Channel number (0 to 15)
DC Diagnostic code as defined in IS0 8208
DP Data packet type (Figure 5-23)
P S-bit sequence, first packet flag
FILL Fill field
FILL1 Has a length of 6 bits for downlink SLM
frames; otherwise it is 0 bit
FILL2 Has a length of 0 bit for downlink SLM
frames; otherwise it is 2 bits
FIRST Thc contents of the first of the multiplexed
PACKET packets
FS Fast select present
L "More bit" for long-form MSF packets as
specified in 5.2.7.4
LAST The contents of the last of the multiplexed
PACKET packets
LENGTH The length of a multiplexed packet in bytes
expressed as an unsigned binary number
Annex 10 - Aeronauticul Telecomrnunicutions Volume III
OD
ODL
OF
P
PR
PS
User data field length; number of user bytes as
specified in 5.2.2.3.1
"More bit" for SVC DATA packets as
specified in 5.2.5.1.4.1
MSP channel number
MSP packet type (Figure 5-23)
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