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时间:2010-07-21 23:04来源:蓝天飞行翻译 作者:admin
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whether flow control was suspended by the subnetwork or by
the subnetwork user. The timer (tN7) 1s associated with the
receiving SSNDPX, i.e. the SSNDPX that originated the
FLOW CONTROL SUSPEND SNPDU.
7.3.4.3.2 System &signs 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.
SSNDPG. The SSNDPA need not correlate the transmission
status of each DATA/INTERRUFT SNPDU with transmission 7.3.4.3.3.1 When the SSNDPX surpasses a storage
status indications from the data link layer. However, the threshold or receives a FLOW CONTROL (suspend) SNPDU
SSNDpA waits until all D M A I I ~ fr~om t~he re~mote SSNDPX, it should notify the MTF of this
SNPDUs have been acknowledged bv the link laver (success/ conditions
fail LIDU) before sending a CONN~CTIONR &EASED or
CONNECTION- RELEASE COMPLETE SNPDU. Since toaircraft
SNPDUs are always delivered in proper sequence by
.the Link layer, the SSNDPG may send a CONNECTION
RELEASED or CONNECTION RELEASE COMPLETE
SNPDU without waiting for acknowledgement of previously
sent DATMNTERRUF~ SNPDUs.
7.3.4 DATA TRANSFER
7.3.4.1 IWF
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 IWF of the flow
control suspend condition, it shodd 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.
The IWF should forward the DATA packets between the 7,3.4.3.3.4 If the SSNDPX falls below a storage threshold
appropriate SSNDPX and IS0 8208 DCE entities and supply or receives flow control resume information from the IWF
these entities with sufficient infomation to identify the after forwarding a FLOW CONTROL (suspend) SNPDU to
appmptiate logical channel. the remote SSNDPX, it should forward a FLOW CONTROL
(resume) SNPDU to the remote SSNDPX.
7.3.4.2 SSNDPC
7.3.4.3.4 IS0 8208 DCE
Since the DATA SNPDUs from the AES are sent through
either the R or T channel, they may be received out-of- 7.3.4.3.4.1 When the IS0 8208 DCE surpasses a storage
sequence at the GES, Therefore, the SSNDPG should have threshold or receives flow control suspend information from
sufficient storage to reorder the out-of-sequence DATA the IWE it should suspend the updating of the lower window
SNPDUs before forwarding the data in these SNDPUs to the edge of the local DTE or forward a RECEIVE NOT READY
IWE packet ta the local DTE.
-ZllUOO No. 75
AWelunent A b Part J Annex 10 - Aeroluruficd Tehcommunicatio~
7.3.4.3.4.2 If the IS0 8208 X E 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 DCE 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 8208 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 guatantee end-to-end delivery of
end-user data, a confirmed service such as the one provided by
a transport protocol may be used.
SNPDU with transmission status indications from the data link
layer. However, the SSNDPA waits until all outstanding
DAT.MNTERRUPT SNPDUs have been acknowledged by the
link layer (succesdfail LIDU) before sendiw a RESET
SNPDU. Since to-aircraft SNPDUs are always delivered in
proper sequence by the link layer, the SSNDPG may send a
RESET SNPDU without waiting for acknowledgement of
previously sent D A T m R R m SNPDUs.
7.3.5 SNPDU FORMATS
7.3.5.1 Fast select facili~
The fast select facility with parameter set to Xse not
permitted" may be included in the CONNECI'ION REQUEST
 
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