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3 = One 16-segment DELM every second resulting from data transfers across the interfaces and from
4 = One 16-segment DELM every 500 ms XDLP internal operation.
5 = One 16-segment DELM every 250 ms
6 = One 16-segment DELM every 125 ms
7- 15 = Unassigned
Aircraft Identification Capability (Table 5-24) 5.2.11.2.1 ADLP timing. ADLP operations shall not take
0 = No aircraft identification capability longer than 0.25 seconds for regular traffic and 0.125 seconds
1 = Aircraft identification capability for interrupt traffic. This interval shall be defined as follows:
Squitter capability subfield
Surveillance identifier capability
Common usage GICB capability report
a) Transponders with downlink ELM capability. The time
that the final bit of a 128-byte data packet is presented
to the DCE for downlink transfer to the time that the
final bit of the first encapsulating frame is available for
delivery to the transponder.
Reserved for ACAS b) Transponders with Comm-B capabilify. The time that the
final bit of a user data field of 24 bytes is presented to
Bit array indicating the support status of DTE the DCE for downlink transfer to the time that the final
sub-address 0 to 15 bit of the last of the four Comm-B segments that forms
Bit value 0 = DTE not supported the frame encapsulating the user data is available for
Bit value 1 = DTE supported delivery to the transponder.
2511 1/04
No. 79
CHAPTER 6. VHF AIR-GROUND DIGITAL LINK (VDL)
6.1 DEFINITIONS AND
SYSTEM CAPABILITIES
Note I.- The vely high frequency (VHF) digital link (VDL)
Mode 2 and the VDL Mode 4 provide data service capabilities.
The VDL Mode 3 provides both voice and data service
capabilities. The data capability i.s a constituent mobile
subnetwork of the aeronautical telecommunication network
(ATN). In addition, the VDL may provide non-ATN functions.
Standards and Recommended Practices (SARPs) for the VDL
are defined and referenced below.
Note 2.- Additional information on VDL is contained in
the Manuals on VDL Mode 2, VDL Mode 3 and VDL Mode 4
Technical Specifications.
Note 3.- Sections 6.1.2 to 6.8.2 contain Standards and
Recommended Practices for VDL Modes 2 and 3. Section 6.9
contains Standards and Recommended Practices for VDL
Mode 4.
6.1.1 Definitions
Automatic dependent surveillance-broadcasr (ADS-B). A
surveillance technique in which aircraft automatically
provide, via a broadcast mode data link, data derived from
on-board navigation and position-fixing systems, including
aircraft identification, four-dimensional position, and
additional data as appropriate.
Broadcast. A transmission of information relating to air navigation
that is not addressed to a specific station or stations.
Burst. A time-defined, contiguous set of one or more related
signal units which may convey user information and
protocols, signalling, and any necessary preamble.
the transmit queue, creates and destroys DLEs for
connection-oriented communications, provides facilities for
the LME to manage the DLS, and provides facilities for
connectionless communications.
Data terminal equipment (DTE). A DTE is an endpoint of a
subnetwork connection.
Exterrded Golay Code. An error correction code capable of
correcting multiple bit errors.
Frame. The link layez h eis composed of a sequence of
address, control, FCS and information fields. For VDL
Mode 2, these fields are bracketed by opening and closing
flag sequences, and a frame may or may not include a
variable-length information field.
Gaussian fdtered frequency shij keying (GFSK). A
continuous-phase, frequency shift keying technique using
two tones and a Gaussian pulse shape filter.
Global signalling channel (GSC). A channel available on a
world-wide basis which provides for communication
control.
Link A link connects an aircraft DLE and a ground DLE and
is uniquely specified by the combination of aircraft DLS
address and the ground DLS address. A different
subnetwork entity resides above every link endpoint.
Link layer. The layer that lies immediately above the physical
layer in the Open Systems Interconnection protocol model.
The link layer provides for the reliable transfer of information
across the physical media. It is subdivided into the
data link sublayer and the media access control sublayer.
Link management entity (LME). A protocol state machine
capable of acquiring, establishing and maintaining a
connection to a single peer system. An LME establishes
Current slot. The slot in which a received transmission begins. data link and subnetwork connections, "hands-off' those
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