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channel group number and a logical channel number;
c) the packet type idcntifier, including P(R).
d) For each PVC within a PVC transit centre, the logical
channel assigned to that PVC on one data link can bc
viewed as the corresponding logical channel with
respect to the logical channel assigned to that PVC on
another data link.
8.6.6.2.2.1.4 RESET REQUEST packet (Figure 8-6),
comprising:
a) the general formal identifier;
e) An octet is .a group of 8 consecutive bits. b) the logical channel identifier, comprising a logical
channel group number and a logical channel number;
f) In the over-all centre architecture, packet level
procedures are considered to exist above the link
procedures and below the transport level procedures.
c) the packet type identifier;
d) the resetting cause field (see 8.6.6.2.1 1 below);
8.6.6.2.2 PACKET FORMAT e) the diagnostic code (see 8.6.6.2.10 below).
8.6.6.2.2.1 The packet format used shall be one of the
following:
8.6.6.2.2.1.5 RESET CONFIRMATION packet
(Figure 8-71, comprising:
Annex 10 - Aeronautical Telecommunications Volume 122
transmission order of bits within each octet
8 7 6 5 4 3 2 1
' Data networlts operating in the packet mode and conneded with ClDlN uslng
procedures desaibed in ITU CCllT Reaimmendatton X.25-1981 may llml the
user data field to not more than 128 octets. Later versions of Remmmendatbn
X.25 will be revlewed as they are released to ascertain whether or not they
should be adopted.
logical channel number
packet type identifier
P(R) I M I P(S) 1 0
user data field
(< = 256 octets*)
t Data networn operating in the packet mode and connecled with ClDlN using
pmcedums described In ITU CCm Recommndatlon X.25-1981 may IImH data
packets to not more than 131 octets. Later versions of RecommendatIan X.25
will be revlewed as they are released to ascertain whether or not they shouM be
adopted.
octet
,equ,nc,
1
general format identifier
0 l o l o 1
2
3
4
< = 259t
Figure 8-3. Data packet format
logical channel
group number
transmission order of bits within each octet
8 7 6 5 4 3 2 1
octet
sequence
1
general format identifier
0 0 0 1
Figure 8-4. Receive rcady packet format
logical channel
group number
transmission order of bits within each octet
logical channel number
packet type identifier
I logical channel number 1 *
8 7 6 5 4 3 2 1
P(R) 0 0 0 0 1
Figure 8-5. Receive not ready packet format
octet
sequence
1
general format identifier logical channel
group number
3
packet type identifier
P(R) 0 0 1 0 1
Purl I Annex 10 - Aeronautical Telecommunications
, transmission order of bits within3 each2 octe1t 1 oc,tet
general format identifier logical channel sequence
group number
I logical channel number 1 *
I packet type identifier
0 0 0 1 1 0 1 1 I
resetting cause field
diagnostic code
transmission order of bits within each octet
8 7 6 5 4 3 2 1
octet
sequence
1
4
5
general format identifier
0 0 0 1
Figure 8-7. Reset confirmation packet format
Figure 8-6. Reset request packet format
logical channel
group number
transmission order of bits within each octet
logical channel number
packet type Identifier
0 0 0 1 1 1 1 1
*
octet
group number
logical channel number
0 0 0 0 0 0 0 0 1
I packet type identifier I
l o o o o o o o o l
1 1 1 1 1 0 1 1
restarting cause field
diagnostic code
4
Figure 8-8. Restart request packet format
transmission order of bits within each octet
8 7 6 5 4 3 2 1
0 0 0 1 1 0 0 0 0
logical channel number
0 0 0 0 0 0 0 0
7/11/96
No. 71
octet
sequence
: 1
general format identifier
2
packet type identifier
1 1 1 1 1 1 1 1
logical channel
group number
3
Figure 8-9. Restart confirmation packet format
Annex 10 - Aeronautical Telecommunications Volume l'l
a) the general format identifier;
b) the logical channel identifier, comprising a logical
channel group number and a logical channcl number;
c) the packet type identifier.
8.6.6.2.2.1.6 RESTART REQUEST packet (Figure 8-X),
comprising:
a) the general format identifier;
b) the logical ch'mnel identifier, comprising a logical
channel group number and a logical channel number;
c) the packet type identificr;
d) the restarting cause field;
e) the diagnostic code (see 8.6.6.2.10 below).
　
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