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5.2.3 Data exchange interfaces
5.2.3.1 THE DTE IS0 8208 INTERFACE
addresses. The detection of an illegal DTE address in a CALL
FEQUEST packet shall lead to a rejection of the call as
specified in 5.2.5.1.5.
5.2.3.1.1 General provisions. The interface between the 5.2.3.1 +4 PACKET LAYER PROTOCOL REQ~,REME,~.$
XDLP and the DTE(s) shall conform to IS0 8208 packet layer OF THE Z)TWZ)CE INTERFACE
protocol (PLP). The XDLP shall support the procedures of the
DTE as specified in IS0 8208. As such, the XDLP shall 5.2.3.1.4.1 Cupabilities. The interface between the DTE
contain a DCE (5.2.4). and the RCE shall conform to IS0 8208 with the following
capabilities:
5.2.3.1.2 Physical and link layer requirements for the
DTWDCE interface. The requirements are: a) expedited data delivery, i.e. the use of INTERRUPT
packets with a user data field of up to 32 bytes;
a) the interface shall be code and byte independent and
shall not impose restrictions on the sequence, order, or b) priority facility (with two levels, 5.2.5.2.1.1.6); and
pattern of the bits transferred within a packer; and
c) fast select (5.2.5.2.1.1.13, 5.2.5.2.1.1.16).
b) the interface shall support the transfer of variable
length network layer packets. Other IS0 8208 facilities and the D-bit and the Q-bit shall not
be invoked for transfer over the Mode S packet layer protocol.
5.2.3.1.3 DTE ADDRESS 5.2.3.1.4.2 Parameter vahes. The timer and counter
parameters fox the DTE/DCE interface shall conform to the
5.2.3.1.3.1 Ground DTE address. The ground DTE default ISO 8208 values.
address shall have a total length of 3 binary coded decimal
(BCD) digits, as follows:
5.2.3.2 MODE S SPECIFIC
SERVICES INTERFACE
Xo shall be the most significant digit. Ground DTE addresses Note.- Mode S spec$c services consist of the broadcast
shall be decimal numbers in the range of 0 through 255 coded and Comm-B, GICB and MSP.
in BCD. Assignment of the DTE address shall be a local issue.
All DTEs connected to GDLPs having overlapping coverage
shall have unique addresses. GDLPs which have a flying time
less than T, (Table 5-1) between their coverage areas shall be 5-2-3-2.1 ADLP
regarded as having overlapping coverage.
5.2.3.2.1.1 General provisions. The ADLP shall support
5.2.3.1.3.2 Mobile DTE address, The mobile DTE the accessing of Mode d Specific services t h u g h the proaddress
shall have a total length of 10 BCD digits, as follows: vision of one or more separate *DLP interfaces for this
pucpose.
Xo shall be the most significant digit. The digits Xo to X, shall
contain the octal representation of the aircraft address coded
in BCD. The digits X8X9 shall identify a sub-address for
specific DTEs on board an aircraft. This sub-address shall be
a decimal number in the range of 0 and 15 coded in BCD. The
following sub-address assignments shall be used:
00 ATN router
01 to 15 Unassigned
5.2.3.1.3.3 Illegal DTE addresses. DTE addresses
outside of the defined ranges or not conforming to the formats
for the ground and mobile DTE addresses specified in
5.2.3.1.3.1 and 5.2.3.1.3.2 shall be defined to be illegal DTE
5.2.3.2.1.2 Functional capability. Message and control
coding via this interface shall support all of the capabilities
specified in 5.2.7.1.
5.2.3.2.2 GDLP
5.2.3.2.2.1 General provisions. The GDLP shall support
the accessing of Made S specific services through rhe provision
of a separate GDLP interface for this purpose andor by
providing access to these services through the DTElDCE
interface.
5.2.3.2.2.2 Functional capability. Message and control
coding via this interface shall support all of the capabilities
specified in 5.2.7.2.
511 1/98
No. 73
Annex 10 - Aeronautical Telecommunications Volume IIZ
5.2.3.3 ADLP~TRANSWNDEINRT ERFACE
5.213.3.1 TRANSPONDETRO ADLP
5.2.3.3.1.1 The ADLP shall accept an indication of
protocol type from the transponder in connection with data
transferred from the transponder to the ADLF! This shall
include the following types of protocols:
The ADLP shall also provide the I1 code for transfer of a
multisite-directed Cornm-I3 or downlink ELM and the
Comm-B data selector (BDS) code (3.1.2.6.1 1.2 of Annex 10,
Volume IV) for a ground-initiated Comm-B.
5.2.3.3.2.2 The ADLP shall be able to ~erformf rame
cancellation as specified in 5.2.2.5.5.
5.2.3.4 GDLPMoDE S INTERROGATOR INTERFACE
a) surveillance interrogation;
5.2.3 -4.1 IhrTERROGATOR TO GDLP
b) Comm-A interrogation;
c) Comm-A broadcast interrogation; and
d) uplink ELM.
The ADLP shall also accept the 11 code of the interrogator
used to transmit the surveillance, Comm-A or uplink ELM.
　
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