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definitions for VDL Mode 2 are contained in the Manual on
VDL Mode 2 Technical Specifications.
6.5.3.2 For Mode 3, the DLS shall support bit-oriented,
priority based, simplex air-ground communications using the
acknowledged connectionless data link (A-CLDL) protocol.
Note.- Specific data link services, parameter and pmtocol
de$nitions for VDL Mode 3 are contained in the Manual on
VDL Mode 3 Technical Specificutions.
VDL Mode 2 Technical Specifications shall have precedence.
On the air-ground interface, the aircraft subnetwork entiry
shall act as a DTE and the ground subnetwork enlily shall act
as a DCE.
Note.- Specific subnetwork layer protocol access points,
services, packet formats, parameters and procedures for VDL
Mode 2 are contained in the Marzuul on VDL Mode 2
Terlz~aicaSl pecifzcutions.
6.6.2 Architecture for Mode 3
6.6.2.1 The subnetwork layer used across the VHF
air-ground subnetwork for VDL Mode 3 provides the
flexibility to simultaneously support multiple subnelwork
prolocols. Thc currently defined options are to support IS0
8473 connectionless network protocol and to support IS0
8208, both as contained in the Manual on VDL Mode 3
Technical Specifications. The Manual on VDL Mode 3
Technical Specifications shall have precedence with respect to
any differences with the cited specifications. For the IS0 8208
interface, both the air and ground subnetwork entities shall act
as DCEs.
Note.- Specific subnetwork layer protocol access points,
services, packet fonnafs, parameters and procedures for VDL
Mode 3 are contained in the Munuul on VDL Mode 3
Technical Specificutions.
6.7 THE VDL MOBILE
6.5.4 VDL management entity SUBNETWORK DEPENDENT
CONVERGENCE FUNCTION (SNDCF)
6.5.4.1 Services. The VME shall provide link
establishment, maintenance and disconnection services as well
as support parameter modification. Specific VME services, 6.7.1 VDL Mode 2 SNDCF
parameter formats and procedures for Modes 2 and 3 are
contained in the Manuals on VDL Mode 2 and Mode 3 6.7.1.1 Introduction. The VDL Mode 2 mobile SNDCF
Technical Specifications. shall be the standard mobile SNDCF.
6.6 SUBNETWORK LAYER
PROTOCOLS AND SERVICES
66.1 Architecture for Mode 2
6.6.1.1 The subnetwork layer protocol used across the
VHF air-ground subnetwork for VDL Mode 2 is referred to
formally as a subnetwork access protocol (SNAcP) and shall
conform to IS0 8208, except as contained in the Manual on
VDL Mode 2 Technical Spccificalions. The SNAcP is
contained within the Manual on VDL Mode 2 Technical
Specifications as the subnetwork protocol. If there are any
differences between the Manual o11 VDL Mode 2 Technical
Specifications and the cited specifications, the Manual on
6.7.1.2 New function. The VDL Modc 2 mobile SNDCF
shall support maintaining context (e.g. compression tables)
across subnetwork calls. The SNDCF shall use the same
context (e.g. compression tables) across all SVCs negotiated to
a DTE, when negotiated with the same parameters. The
SNDCF shall support at least 2 SVCs sharing a context.
Note 1.- Because hand~ffs can be expected to reorder
packets, certain compression algorithms do not lend
themselves to use over VDL Mode 2. Further; implementors of
dictionary-based compression algorithms must be sensitive to
the problem of updates arriving on either the old or newly
established call.
Note 2.- The encoding of the Call User Data jield is
described in Doc 9705 except with mod#cation,s as contained
in the Manual on VDL Mode 2 Technical Specijications.
1/11/01
No. 76
Part I Annex I0 - Aeronautkal Tekcommunications
6.7.2 VDL Mode 3 SNDCF
6.7.2.1 The VDL Mode 3 shall support one or more of the
defined SNDCFs. The fjrst is the standard IS0 8208 SNDCF
as defined in Doc 9705. This is a connection-oriented SNDCE
The second type of SNDCF supported by VDL Mode 3 is
denoted frame-based SNDCF. The details of this connectionless
oricnted SNDCF are contained in the Manual on VDL
Mode 3 Technical Specifications, including network layer
interface, support for broadcast and unicasl network packets,
and ATN router support.
Nore.- The framed-based SNDCF is term,ed s~lclz because
it uses the VDL Mode 3 frames without the need .for an
additioml protocol (viz. IS0 8208 SNDCF) to tran,sfer
network packets. The frame-bused SNDCF achieves
indepetzdence from the network protocol by identlfiing the
payload of each frame. Upon receipt of a frame, the payloud
is examined and control is passed to the protocol identijied.
6.8 VOICE UNIT FOR MODE 3
6.8.2 Speech encoding, parameters
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