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an SNPDU number not immediately following the SNPDU 1 if fast select with restriction on response applies; otherwise,
number of the data SNPDU last received, the SSNDPA shall it shall be set to 0.
initiate a reset of the connection.
4.7.3.10.2.3 DTE address length field
4.7.3.10 SNmU FORMATS
4.7.3.10.1 GENERAL SNPD U FORM.4T
Octet 3 shall consist of the calling- and called-DTE address
length fields. Bits 8 to 5 shall specify the length of the calling-
DIE address in semi-octets. Bits 4 to 1 shall specify'the length
4.7.3.10.1.1 An SNPDU shall co~~sisoft at least two of the called-DTE address in semi-octets. Each address-length
octets. Octet 1 shall contain the D- and M-bits and the SNPDU field shall be binary-coded, where bit 5 or 1 shall be the lowt-
y -p e identifier field. Octet 2 shall contain the logical channel bit of the indicator.
number field; depending on the particulu S-WDU type,
addidonal octets may be required. The general SNPDU format
shall be as defined in Figure 4-13. 4.7.3.10.2.4 Calling- and called-DTE fields
4.7.3.10.1.2 The D- and M-bits shall be bits 7 and 8, 4.7.3.10.2.4.1 When indicated by the DTE addresses
respectively, in octet 1. length field, the octets following the DTE addresses length
field shall contain the called-DTE address followed by the
4.7.3.10.1.3 The M-bit shall be used in an M-bit SNPDU
sequence consisting of a sequence of data SNPDUs; it shall be
set to 0 in all other SNPDUs.
Note.- The R-bit m y be used for end-to-end
acknowledgement (receipt confirmation).
4.7.3.10.1.4 The SNPDU type identifier field shall be bits
1-6 in octet 1. The coding of the SNPDU type identifier field
shall be as defined in Table 4-15.
4.7.3.10-1.5 Octet 2 shall contain the logical channel
number field.
calling-DTE address.
4.7.3.10.2.4.2 Each digit of an address shall be coded in
a semi-octet in binary-coded decimal, whee bit 5 or bit 1 shall
be the low-order bit of the digit.
4.7.3.10.2.4.3 Starting from the high-order digit, a DTE
address shall be coded in consecutive octets, with two digits
per octet. In each octet, the higher-order digit shall be coded
in bits 8 to 5. When the total number of digits in the calledplus
calling-DTE fields is odd, the wmbincd fields shall be
rounded up to an integral number of octets by inserting zeros
in bits 4 to 1 of the last octet of the combined fields.
2 f l P / 0 0
No. 7s
Part 1 Annex 10 - Aeronautical Telecommunications
4.7.3.1 0.2.5 Called- and calling-NSAP
address fields
When indicated by the called- and calling-NSAP address
present indicator bits, the octets following the calling- and
called-DTE fields shall contain the called-NSAP address field,
then the calling-NSAP address field.
4.7.3.10.2.6 Facility field length field
When indicatedby the facilities field present indicator bit, the
next octet shall contain the length of the facilities field in
octets. The facility field length field shall be binary-coded,
where bit 1 shall be the low-order bit of the field.
4.7.3.10.3.5 Facilitiesfield
When indicated by the facilities field present indicator bit, the
octets following the facilities field shall contain the codes and
parameters for the facilities.
4.7.3.10.3.6 Called user data field
The next octets shall be used to carry the called user data, if
any. If fast select facility is used, not more than 128 octets of
data shall be present.
4.7.3.10.2.7 Facilities field 4.7.3.10.4.1 The connection released SNPDU format shall
be as defrned in Figure 4- 16.
When indicated by the Facilities fie'ld present indicator bit, the
octets following the facility field length field shall contain the
codes and parameters for the facilities. 4.7.3.10.4.2 SNPDW type identijierfield
4.7.3.10.2.8 Call user data field 4.7.3.10.4.2.1 Bit 2 shall be the NSAP address present
indicator bit.
The next octets shall be used to carry the call user data, if any.
If fast select facility is not used, not more than 16 octets of 4.7.3.10.4.2.2 This bit shall be set to 1 if the called-NSAP
data shall be present. If fast select facility is used, not more address field is Present; otherwise, it shall be set to 0.
than 128 octets of data shall be present.
4.7.3.10.4.3 Culled-NSAP address JSeld
4.7.3.10.3 CONNECTIOCNON FIRM SNPDU This field shall have the same coding as 4.7.3.10.3.3.
4.7.3.10.3.1 The format of the connection confirm
SNPDU shall be as specified in Figure 4-15. 4.7.3.10.4.4 Clearing cause field
4.7.3.10.3.2 SNPDU type ident$erfield 4.7.3.10.4.4.1 The next octet shall be the clearing cause
field. It shall contain the clearing cause for the release of the
4.7.3.10.3.2.1 Bits 1 and 2 shall be the following indicator c~nnection.
　
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