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appropriate logical channel.
7.3.4.2 SSNDPG
Since the DATA SNPDUs from the AES are sent through either
the R or T channel, they may be received out-of-sequence at the
GES. Therefore, the SSNDPG should have sufficient storage to
reorder the out-of-sequence DATA SNPDUs before forwarding
the data in these SNDPUs to the WF.
7.3.4.3 Flow control procedue
7.3.4.3.1 Memory management mechanisms are implementation
dependent. In order to minimize the possibility of
memory overflow and the consequent loss of data, the satellite
subnetwork layer provides flow control, which may be invoked
by the AES, the GES, or the subnetwork user. The SSNDPX
uses start-stop flow control, while the DCE uses IS0 8208
window flow control. IS0 8208 RECEIVE READY and
BECEIVE NOT READY packets are produced locally; they
are never transferred across the subnetwork. If the SSNDPX
remains in the "flow control not ready" state for 60 seconds,
the subnetwork initiates a reset of the connection, regardless
of whether flow control was suspended by the subnetwork or
by the subnetwork user. The timer (tN7) is associated with the
receiving SSNDPX, i.e. the SSNDPX that originated the
FLOW CONTROL SUSPEND SNPDU.
7.3.4.3.2 System designs should minimize the possibility
that flow- control will be invoked on priority 14 connections,
e.g. by dynamic memory allocation or by providing additional
fixed memory allocation for priority 14 connections. Dynamic
memory allocation procedures, if used, should take connection
priority into consideration.
7.3.4.3.3 SSNDPX
7.3.4.3.3.1 When the SSNDPX surpasses a storage
threshold or receives a FLOW CONTROL (suspend) SNPDU
from the remote SSNDPX, it should notify the IWF of this
condition.
7.3-4.3.3.2 If the SSNDPX falls below a storage
threshold or receives a FLOW CONTROL (resume) SNPDU
from the remote SSNDPX after it has informed the W of the
flow control suspend condition, it should notify the IWF of
this condition.
7.3.4.3-3.3 When the SSNDPX surpasses a storage
threshold or receives flow control suspend information from
the IWF, it should forward a FLOW CONTROL (suspend)
SNPDU to the remote SSNDPX when the next DATA
SNPDU is received on that VC, providing the situation has not
cleared by then.
7.3.4.3.3.4 If the SSNDPX falls below a storage
threshold or receives flow control resume information from the
IWF after forwarding a FLOW CONTROL (suspend) SNPDU
to the remote SSNDPX, it should forward a FLOW
CONTROL (resume) SNPDU to the remote SSNDPX.
7.3.4.3.4.1 When the IS0 8208 DCE surpasses a storage
threshold or receives flow control suspend information from
the IWF, it should suspend the updating of the lower window
edge of the local DTE or forward a RECEIVE NQT READY
packet to the local DTE.
7.3.4.3.4.2 If the IS0 8208 DCE falls below a storage
threshold or receives a flow control resume information from
the IWF after it has suspended the updating of the lower
window edge of the local DTE or forwarded a RECEIVE
NOT READY packet to the local DTE, it should resume
updating the lower window edge of the local DTE or forward
a RECEIVE READY packet to the local DTE.
7.3.4.3.4.3 When the IS0 8208 W E surpasses a storage
threshold or receives a RECEIVE NOT READY packet from
the local DTE, it should notify the IWF of this condition.
7.3.4.3.4.4 If the IS0 82.08 DCE falls below a storage
threshold or receives a RECEIVE READY packet from the
local DTE after it has informed the IWF of the flow control
suspend condition, it should notify the IWF of this condition.
7.3.4.4 Data loss
7.3.4.4.1 In a connection release or connection reset.
DATA SNPDUs and IS0 8208 DATA packets on that connection
may be lost. To guarantee end-to-end delivery of end-user
data, a confirmed service such as the one provided by a
transport protocol may be used.
7.3.4.4.2 System designs should minimize the possibility
that flow control will be invoked on priority 14 connections,
e.g. by dynamic memory allocation or by providing additional
Anrrex 10 - Aeronautical T e l ~ ~ o m m t l n i ~ s Volume III
fixed memory allocation for priority 14 connections. Dynamic
memory allocation procedures, if used, should take connection
priority into consideration.
7.3.4.5 Expedited data transfer
7.3.4.5.1 It is expected that the Am will not require
expedited data transfer service. However, expedited data
transfer service is supported in accordance with IS0 8208.
7.3.45.2 For each logical channel, the expedited data
transfer allows an interrupt SNPDU packet to be sent in a
given direction while data transfer in that direction is
　
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