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CONFIRMATION with the appropriate cause code ifthe peer encoding shall be as specified in IS0 8208.
subnetwork entity wants to use modulo 128 sequencing.
6.6.3.2 Calling and called DTE addresses. Calling and 6.6.4 Subnetwork layer service
called DTE addresses shall be as detailed in 6.6.3.2.1 through system parameters
6.6.3.2.3.
The parameters listed in Table 6-52 shall be used in the
6.6.3.2.1 Encoding. Octet 5 and consecutive octets shall subnetwork protocol. Except as noted in 6.6.6, the description
consist of the following addresses, in order: of function and procedures shall be as documented in IS0
8208. For all parameters, Table 6-52 indicates the configured
a) called DTE address; and or negotiated values that shall be used by the aircraft DTE and
the ground DCE. T21, T23, and R23 shall also apply to the
b) calling DTE address. ground DTE.
6.6.3.2.1.1 Address jeld. This variable length field is 6.6.4.1 Packet size. The Packet Size shall be negotiated
known informally as the address field. The address field shall via the flow control parameter negotiation facility or
be encoded in a BCD form. When appropriate, the address Nonstandard Default Packet Size facility to be the value in
field shall be rounded up to an integer number of octets. Table 652 appropriate to the mode for both directions.
6.6.3.2.2 Aircrafr 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 Ground 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 sent in the Called
Address Extension facility. Bit 8 of thc first octet after the
facility code shall be set to 1 and bit 7 shall be set to 0. The
Called Addrcss shall not be included when using VDL
subnetwork-specific ground DTE addresses.
6.6.3.2.4 Ground nelwork DTE addresses. If the ground
LME indicates support of ground network DTE addresses
during link establishment, it shall accept and process addresses
which follow the format used in the ground network. All
CALL REQUESTS from the ground shall use, as the Calling
Address, the ground DTEs X.121 address.
Note.- This facility allows addressing of ground DTEs
other than those associated wirh the ATN routers in the list of
ATN router NETS. It requires however that the aircrafr system
management entity (SME) know or be informed via an
application exchange of the address of the DTE in the ground
network.
6.6.3.3 Call user data$eld. The fast select facility shall
be used to carry 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 95781,
Chapter 11.
6.6.3.4 Packet types. All packet types (except the
INTERRUPT, INTERRUPT CONFIRMATION, and
6.6.4.2 Parameter W (transmit window size). The
parameter W shall be the maximum number of outstanding
sequentially numbered data packets that may be transmitted
before an acknowledgement is required. In the absence of
negotiations via the nonstandard default window size facility
or the flow control parameter negotiation facility, this
parameter shall be as per Table 6-52. W shall be negotiated to
the same value in both directions.
Note.- This parameter is identical to the standard IS0
8208 parameter W
6.6.4.3 Parameter A (acknowledgment window size).
This parameter, A, shall be the minimum number of frames
the receiver shall receive before it generates an RR packet.
Parameter A shall not be separately negotiated, but be set to
the smallest integer greater than or equal to the value of onehalf
of parameter W.
Note.- The purpose of the acknowledgment window is to
reduce the probability that an explicit acknowledgenient needs
to be sent. The acknowledgment window is set to one-half of
the transmit window to reduce the probability that a sturion
will go into jlow control.
6.6.5 Effects of layers 1 and 2
on the subnetwork layer
The subnetwork layer virtual circuit shall be valid only on the
underlying link layer connection over which it was established.
6.6.6 Description of procedures
Exccpt where noted in 6.6.6.1 through 6.6.6.5, the provisions
of IS0 8208 shall apply between the aircraft DTE and the
ground DCE. If a ground DCE receives an unsupported packet
6111W7
No. 72
Part I Annex 10 - Aeronautical Xelecommunications
layer facility, it shall either process the CALL REQUEST
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