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SNPDU to explicitly indicate that no user data may be
transferred in the CONNECTION CONFIRM and
CONNECTION RELEASED SNPDUs. If this facility is not
included in the CONNECTION REQUEST SNPDU, then up
to 128 octets of user data may be transferred in the
CONNECTION CONFIRM and CONNECTION RELEASED
SNPDUs.
7.3.6 PACKET TO SNPDU MAPPING RULES
7.3.4.4.2 System designs should minimize the possibility
that flow control will be invoked on priority 14 connections, 7.3.6.1 GES actiom
e.g. by dynamic memory allocation or by providing additional
fixed memory allocation for priority 14 connections. Dymic 7.3.6.1-1 The selected throughput class in the CALL
memory allocation procedures, if used, should take connection ACCEPTED packet should be transferred to the TcN value in
priority into consideration. the CONNECTION CONFIRM SNPDU.
7.3.6.1.2 If the throughput class in the CALL REQUEST
.3.4.5 Expedited data tmnsfer packet is less than or equal to the calculated available value,
then the throughput class should be transfed to the TCN
7.3.4.5.1 It is expected that the ATN will not require value in the CONNECTION ReQUmT SNPDU; otherwise,
expedited data transfer service. However, expedited data the calculated available t h r ~ g h ~rtou,n ded down to the
transfer service is supported in accordance with IS0 8208. nearest standard value, should be transferred to the TCN value.
7.3.4.5.2 For each logical channel, the expedited data
transfer allows an intempt SNPDU packet to be sent in a
given direction while data transfer in that direction is
suspended. This is accomplished by sending the interrupt
SNPDU or interrupt packet ahead of data SNPDUs or data
packets that have been suspended.
7.3.4.6 Connection met
7.3.4.6.1 SSNDPX. To avoid resets at the SSNDPG
caused by residual DAT-RRUPT SNPDUs from the
SSNDPA, the SSNDPA waits until all DATmRRUPT
SNPDUs in transmission and pertaining to that connection
have been transmitted before forwarding RESET or RESET
CONFIRM SNPDUs to the SSNDPG. The SSNDPA need not
correlate the transmission status of each DATA.RRUPT
7.3.7 !?iNPDu TO PACKET MAPPING RULES
7.3.7.1 GES actions
7.3.7.1.1 If the throughput class negotiation (TCN) value
in the CONNECTION REQUEST SNPDU is less than or
equal to the calculated available throughput value, the
throughput class in the INCOMING CALL packet should be
set equal to the TCN value; otherwise, the throughput class in
the INCOMING CALL packet should be set equal to the
calculated available throughput, rounded down to the nearest
standard value.
7.3.7.1.2 The selected throughput class in the CALL
CONNECTED packet should be transferred from the E N
value in the CONNECTIQN CONFIRM SWDW.
Annex 10 - Aeronautical TePecommunimtbns Volume ZZI
7.4 IS0 8208 DCE earth stations (GESs) operating in the safety service. The
protocol operations protocol interactions necessary to support air and groundoriginated
calls arriving at the AES or GES are defined via
separate signalling procedures in each.
7.4.1 CONFORMANCREE QUIRGMENTS
8.1.2 Logic for air-originotions. The AES and GES air-
The capabilities which the IS0 8208 DCE is not required to origination signalling procedures for the prevalent aeronautical
support include the following: mobiksatellite service (AMSS) and fw the aeronautical
mobile satellite (route) service (AMS(R)S) are the same.
a) modulo 128 packet sequencing; Provisim are made for an abbreviated call establishment
procedure, specifically voice calls at the safety priorities (i.e.
b) default window size of more than 2; and distresdurgency, fight safety and regularity/metmlogical).
C) either the use of the D-bit or the optional mechanism for
negotiating use or non-use of the D-bit since these
capabilities are not required by the subnetwork users.
Note.- The use of D-bit or the optioml medranjitn
for iiegotiaring use or non-use of the D-bit is strongly
discouraged,
7.5 Management interface
8.1.3 Link fuyer services. Circuit-mode services use the
R, P, and C channel subband link layer protocols defined in
Annex 10, Wume m, Part I, Chapter 4, 4.5 a d 4.6 for all call
signalling information exchanged between the AES and GES.
This infomation is exchanged with the link layer via circuitmode
link interface data units (CM-L3DUs). Link layer
services perform conversions between CM-LmUs and the
respective AMS(R)S circuit-mode signalling units @Us). In all:
cases, only the direct link service (DLS) is used since circuitmode
services are responsible for recovering from missing
sus.
7.5.1 AES MANAGEMENT INTERFACE
When an AES logs off or otherwise terminates communication
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