ISO 29281-1:2013/Amd 1:2017

INTERNATIONAL ISO
STANDARD 29281-1
First edition
2013-04-15
AMENDMENT 1
2017-04
Intelligent transport systems —
Communication access for
land mobiles (CALM) — Non-IP
networking —
Part 1:
Fast networking & transport layer
protocol (FNTP)
AMENDMENT 1
Systèmes intelligents de transport — Accès aux communications des
services mobiles terrestres (CALM) — Réseautique non-IP —
Partie 1: Réseautique rapide et protocole de la couche transport
AMENDEMENT 1
Reference number
ISO 29281-1:2013/Amd.1:2017(E)
©
ISO 2017

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ISO 29281-1:2013/Amd.1:2017(E)

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ISO 29281-1:2013/Amd.1:2017(E)

Foreword
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Amendment 1 to ISO 29281-1:2013 was prepared by Technical Committee ISO/TC 204, Intelligent
transport systems.
A list of all parts in the ISO 29281 series can be found on the ISO website.
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ISO 29281-1:2013/Amd.1:2017(E)
Intelligent transport systems — Communication access for
land mobiles (CALM) — Non-IP networking —
Part 1:
Fast networking & transport layer protocol (FNTP)
AMENDMENT 1
Page 8, Table 1
In the second row “Port Number 0” and third column “Description”, add the following sentence at the end:
“PORT_SAM is of type PORT_REG.”
In the fourth row column for “Port Number”, replace “32717 - 32763” with “32717 - 32762” and insert
this row below:
32763 PORT_RSM Port number for the remote ITS-station management protocol (RSMP)
Page 8, Table 2
Rearrange the table as presented below:
B7 B6 B5 B4 B3 B2 B1 B0 Description
’0’ ’0’ ’0’ ’0’ ’0’ ’0’ ’0’ ’0’ Used in the NF-FNTP-COMM service to indicate, that no ex-
tension is to be applied.
’1’    Option 0: ITS station-internal forwarding. The related Options
field is present.
’1’   Option 1: Support of secure communications. The related
Options field is present.
 ’1’   Option 2: N-hop broadcast. The related Options field is present.
  ’1’  Option 3: LPP support. The related Options field is present.
  ’1’  Option 4: CIP support. The related Options field is present.
   ’1’ Option 5: So far undefined feature. The related Options field
is of ASN.1 NULL type. Reserved for future.
   ’1’ Option 6: So far undefined feature. The related Options field
is of ASN.1 NULL type. Reserved for future.
    ’1’ Option 7: So far undefined feature. The related Options field
is of ASN.1 NULL type. Reserved for future.
Page 11, 6.2.3
Add the following sentence at the end of the paragraph before Figure 11:
“The length field shall contain an unsigned Integer value in the range from 0 to 65 535, indicating the
number of octets contained in the field ITS-FPDU.”
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ISO 29281-1:2013/Amd.1:2017(E)

Page 11, Figure 11
Replace the figure and the figure title with the following:
Figure 11 — FNTP body
Page 11, 6.2.3
Add the following Note below Figure 11:
NOTE The ASN.1 type used to model the FNTP body with a two octet length indicator is ITSfpdu
specified in A.2.
Page 15, 7.6.1
Replace the first paragraph and the subsequent bullet line with:
Upon a transmission request received via the NF-SAP by means of the service primitive NF-FNTP-
COMM.request, the FNTP may first check whether the forwarding table contains an entry in support of
the transmission request.
—  If no such entry exists, the transmission request may be discarded. In case the transmission request
is discarded, the FNTP shall notify failure of transmission by means of the service primitive NF-FNTP-
COMM.confirm.
Page 19, 7.7.4
Replace the fifth bullet line with:
—  If a bit for an unknown or non-supported option is set, this option shall be ignored if possible except
it is the option for secure communications or the whole NPDU shall be discarded.
Page 22, 8.2.1
Replace the first bullet line with:
—  request assignment of a locally valid port number which is unique in the ITS-SCU to the ITS-SP
identified by “serviceRef”, if parameter “port” is set to PORT_UNK, or shall use the well-known static
port PORT_REG,
Page 22, 8.2.1
Convert the last bullet line of the first bullet list into the following Note:
NOTE The ITS station management notifies other ITS-SCUs in the same ITS-SU about the new entry.
Page 24, 8.3.1
Replace the second paragraph with:
Parameter “hopCount” shall indicate the initial value to be put into the element “FNTP hop count”
illustrated in Figure 9. For single-hop communications, this optional parameter either shall not be
present or shall be set to zero.
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