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(i.e. a CALL CONFIRMATION or a CLEAR REQUEST)
were not included in the XlD-RSPHO. A ground DTE shall
set the Calling Address field to its X.121 address. The ground
DCE shall use the Called Line Address Modified Notification
facility to inform the aircraft DTE of the ground DTE's X. 121
address.
Note.- The CLEAR CONFIRMATION, $required, will be
transferred in an INFO frame. How the ground LME obtains
the CALL REQUEST packet(s) (in ground-initiated hundoffss)
is outside the scope of this document.
Annex 10 - Aeronautical Telecommunications Volume ZZZ
6.6.6.3.3.3 Broadcast subnetwork connection
maintenance. In order to set the "b," bit in the XID AVLC
Specific Options parameter to I, an LME shall support this
section. The procedures described in 6.5.4.4.10 shall be
invoked for each aircraft that indicates support for broadcast
subnetwork procedures. The ground DTE and DCE and
aircraft DTE shall assumc those subnetwork connection have
been maintained per 6.5.4.4.10. If an aircraft Dm cannot
accept a call, it shall send a CLEAR REQUEST. If the ground
DTE indicated that it maintained the SNJICF context but the
aircraft DTE cannot maintain the SNDCF context, it shall send
a CALL REQUEST indicating that the SNDCF context is not
to be maintained.
Note.- The CLEAR CONFIRMATION, $required, will be
transferred in an INFO frame. How the ground and aircraft
LME know how to create the calls with their associated
negotiated facilities is outside the scope of this document.
6.6.6.4 Error handling. An aircraft DTE or ground DCE
shall send a CLEAR REQUEST, RESET REQUEST, or
RESTART REQUEST packet only for recovery from a DTE
failu,re. When an aircraft DTE or ground DCE receives a
packet with a bad sequence number, it shall transmit a
RFJECT, as specified in IS0 8208, Section 13.4.
6.6.6.5 Acknowledgments. An RR packet shall be
generated only when a valid DATA packet is received with a
P(s), which closes the acknowledgment window. The aircraft
DTE or ground DCE shall transmit an RR packet
achowledgi,ng the outstanding packets as soon as it is able.
6.7 THE VDL MOBILE
SUJ3NETWORK DEPENDENT
CONVERGENCE FUNCTION (SNDCF)
6.7.1 Introduction
The VDL mobile SNDCF shall be the standard mobile
SNDCE
6.7.2 New function
The VDL mobile SNDCF shall support maintaining context
(e.g. compression tables) across subnetwork calls. The SNDCP
shall use the same context (e.g. compression tables) across all
SVCs negotiated to a DIE, when negotiated with the same
parameters. The SNDCF shall support at least 2 SVCs sharing
a context.
Note.- Because handofls can be expected to reorder
packets, certain compression algorithms do not lend
themselves to use over the VDL. Further, implementors of
dictionary-based compression algorithms must be sensitive to
the problem of updates arriving on either the old or newly
established call.
6.7.3 Call user data encoding
The Call User Data field shall be as detailed in the ATN
Manual, except as modified below.
6.7.3.1 ISH PDU. The ISH PDU shall be included in
both the CALL REQUEST and CALL CONFIRMATION
packets.
6.7.3.2 Maintained/initialized stahrs bit. The fifh bit of
the compression technique octet (i,e, the sixth octet of the Call
Uscr Data field) shall be the maintainedlinitialized (MA) status
bit which is used to indicate whether the SNDCF context (e.g.
the compression state) was maintained from an old SVC to a
new SVC.
6.7.3.3 CALL REQUEST If the calling SNKF is
requesting that the SNDCF context be maintained from an
existing call to the new call being established, it shall set the
M/I bit to 1: otherwise, the MII bit shall be set to 0.
6.7.3.4 CALL CONFIRMATION. I f the called SNDCF
has successfully maintained the entire SNDCF context to the
new call being established, it shall set the MA bit to 1;
otherwise, the M/I bit shall be set to 0.
6/11/97
No. 72
Part I Annex 10 - Aeronautical Telecammunications
TABLES FOR CHAPTER 6
Table 6-1. Mode 2 data encoding
Table 6-2. Spectral mask of transmitter for D8PSK
LOWER BOUND
Note.- Freqc4erzcy deviation from the channel centre (on botlz sides) is specified in Hz, and
the attenuation is speciJed in dBc.
UPPER BOUND
Frequency
deviation Attenuation
Frequency
deviation Attenuation
Annex 10 - Aeronautical Telecommunications Volume ZZZ
Table 6-3. Tolerance on the phase mask of transmitter for DSPSK
LOWER BOUND
Frequency
deviation Phase
I UPPER BOUND
Frequency
deviation Phase
Note.- Frequency deviation from the channel centre (on both sides) is specified in Hz, and
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