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known informally as the address field. The address field shalI
be encoded in a BCD form. When appropriate, the address
field shall be rounded up to an integer number of octets.
6.6.3.2.2 Aircraft DTE address. The aircraft DTE address
shall be the BCD encoding of the octal representation of the
24-bit ICAO aircraft address.
6.6.3.2.3 Gmund DTE address. The VDL subnetworkspecific
ground DTE addresses shall be the BCD encoding of
the ADM, and optionally the ARS field (from the NET, as
defined in the ATN Manual). It shall be senc in the Called
Address Extension facility. Bit 8 of the first octet after the
facility code shall be set to 1 and bit 7 shall be set lo 0. The
Called Address shall not be included when using VDL
subnetwork-specific ground DTE addresses.
connections on receipt of REJECT packets but should 6.6.3.2.4 Ground network DTE addresses. I f the ground
retransmit the specified packfr. LME indicates support of ground network DTE addresses
during link establishment, it shall accept and process addresses
6.6.2.4 Connecrion flow DATA packet sequence which follow the fomat in the grnund network. All
numbering combined with the use of a sliding window shall be CALL REPUESTs from the ground shall use, as the Calling
used for passive flow control. Address, the ground DTEs X.121 address.
6.6.2.4.1 Recommendation.- Receive not ready (RNR) Note.- This facility allows addressing of ground DTEs
packets should not be used for explicitpow control. other than those associated with the ATN routers in the list of
AXN router NETS. It requi~sho wever that the aircrafr system
Note.- The use of explicit RNRs requires a subsequent management entity (SME) know or be informed via an
packet Idear thef2 fDxE NOT READY) state fsee application of the ad&ss @*he DTE in the
IS8 8208). The RNRs and subsequent RR frames will cause nerwotkb
more RF utilization than would be caused by merely delaying
the acknowledgment.
6.6.3 Packet format
Except as qualified below, the packet format shall be as
specified in IS0 8208, Section 12. During call setup, VDL
shall use the extended format in conjunction with the fast
select facility.
6.6.3.1 Generalformat identflel: The Qualifier bit (Q-bit)
in DATA packets shall be set to 0 in VDL. Modulo 8
sequencing shall be used in the VDL.
Note.- A subnetwork entity m y receive a CLEAR
CONFlRMATZON with the appropriate cause code if the peer
subnetwork entity wants to use rnOdfilo 128 sequencing.
6.6.3.3 Call user data jield. The fast select facility shall
be used to carty the VDL mobile SNDCF Call User Data,
including the intermediate system hello (ISH) PDU.
Note.- This reduces the number of transmissions required
to setup the various layers. Refer to the Manual of the
Aeronautical Telecommunication Network (ATN) (Doc 9578),
Chapter 11.
6.6.3.4 Packet t)pes. All packet types (except the
INTERRUPT, INTERRUPT CONFIRMMON, and
RECEIVE NOT READY) shall be used in the VDL. Packet
encoding shall be as specified in IS0 8208.
6.6.4 Subnetwork layer service
system parameters
6.6.3.2 Calling and called DXE addresses. Calling and The parameters listed in Table 6-52 shall be used in the
called DTE addresses shall be as detailed in 6.63.2.1 lhrough subnetwork protocol. Except as noted in 6.6.6, the description
6.6.3.2.3. of function and procedures shall be as documented in IS0
8208. For all parameters, Table 6-52 indicates the configured
6.6.3.2.1 Encoding. Octet 5 and consecutive octets shall or negotiated values that shall be used by the aircraft DTE and
consist of the following addresses, in order: the ground DCE. T21, T23, and R23 shall also apply to the
ground Dm.
a) called DTE address; and
6.6.4.1 Packt size. The Packet Size shall be negotiated
b) calling DTE address. via the flow control parameter negotiation facility or
Part I Annex 10 - Aerottautical Telecommunications
Nonstandard Default Packet Size facility to be the value in
Table 6-52 appropriate to the mode for both directions.
6.6.4.2 Parameter W (transmit window size). The
parameter W shall he. the maximum number of outstanding
sequentially numbered data packets that may be transmitted
before an achowledgement is required. In the absence of
negotiations via the nonstandard default window size facility
or the flow control parameter negotiation facility, lhis parameter
shall be as per Table 6-52. W shall be nego~iatedt o the
same value in both directions.
Note.- This parameter is identical to the stanrdanl IS0
8208 parameter W
6.6.4.3 Parameter A (acknowledgment window size). This
parameter, A, shall be the minimum number of frames the
　
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