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AMCP WG-M6WP/2

AERONAUTICAL MOBILE COMMUNICATIONS PANEL (AMCP)

WGM-6

December 11-20, 2002

ARINC Comments on the AMCP WGM-5 Appendix F

SUMMARY

This paper is the summary of the review of the HFDL Technical Manual by the ARINC and Rockwell Collins. The review took into consideration all the pending amendment proposals within the ICAO/AMCP WGM-5. The ARINC Aviation and Air Traffic Services system engineers in conjunction with the Rockwell Collins systems engineers evaluated the proposed changes and consulted the AEEC specifications and recommended the following actions.

Presented by

Bassam Farroha, Ph.D.Senior Principal Engineer

ARINC2551 Riva Road

Annapolis, MD 21401 USA(410) 266-2160

HFDL Technical Manual Response to AMCP WG-M/5 Proposals

[email protected]

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AMCP WG-M/5 Appendix F

HFDL Manual Amendment Proposals.

The following pages contain Amendment Proposals to the HFDL Manual (to be brought to AMCP/8).

Rockwell/Collins: Comments to this proposal, as addressed in and compared to 635-3, for consideration in both AEEC and ICAO venues.

ARINC Comments to the proposal for consideration in ICAO venue.

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HFDL Manual Amendment Proposal

Title: Various amendment proposals AP working paper number and date XXXXXXXXXXXXXXXDocument(s) Affected: Manual on HF Data Link, Doc 9741-

AN/962, Part II

Document Version: First Edition – 2000Sections of Documents Affected: Figure II-2-1, Paragraph 3.1.3.3.2,

3.1.3.3.10, ATTACHMENT 1 to Part II, Figures II-A1-1, II-A1-4, II-A1-5, ATTACHMENT 2 to Part II, FIELD CODING AND DESIGNATIONS

Coordinator: Loftur E. Jonasson Coordinator's Address: Iceland Telecom, Gufunes Com

Centre, Smararimi 1, 112 Reykjavik, Iceland

Coordinator's Phone: +354 550 6538 Coordinator's Fax: +354 567 5230 Coordinator's E-mail Address: [email protected]: ClarificationProblem description:Background: Changes proposed by Professor Zhou

Zhuoren, China, and verified by ARINC.

Backwards compatibility: Yes.Amendment Proposal: See Below:WG-M Status: Approved 2001-12-18

1. Figure II-2-1, TDMA slot definition (Doc 9741-AN/962, Part II, page II-2-5)

The sequence M1 should be modified as follows:

M1=1 of 108 shifts of the following sequence: 011 1011 0111 1010 0010 1100 1011 1110 0010 0000 0110 0110 1100 0111 0011 1010 1110 0001 0011 0000 0101 0101 1010 0100 1010 0111 1001 00001 1010 1000 0111 1111

ROCKWELL COLLINS- This agrees with 635 Attachment 2-2 Amendment (Draft 2 Supp 4) ARINC - Concurs 2. Paragraph 3.1.3.3.2 (Doc 9741-AN/962, Part II, page II-3-4)The sub-paragraph 3) should be modified as follows: if U(R)vect modulo 2 equals 0, then divided U(R)vect by 2.ROCKWELL COLLINS- This agrees with 635 –3 ARINC - Concurs

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mailto:[email protected]


3 Paragraph 3.1.3.3.10 (Doc 9741-AN/962, Part II, page II-3-5)

The sub-paragraph 3) should be modified as follows: if D(R)vect modulo 2 equals 0, then divided D(R)vect by 2.

ROCKWELL COLLINS- This agrees with 635 –3 ARINC - Concurs

4 ATTACHMENT 1 to Part II, Figure II-A1-1, Numbered LPDU (Doc 9741-AN/962, Part II, page II-A1-1)

The octet #1 should be modified as follows:

BIT NUMBER8 7 6 5 4 3 2 1

U(S)/D(S) RN 0 1

ROCKWELL COLLINS- This agrees with 635 -3 ARINC - Concurs 5 ATTACHMENT 1 to Part II, Figure II-A1-4, Uplink MPDU (Doc 9741-AN/962, Part II, page II-A1-4)


LPDU size (one octet per PLPDU) ROCKWELL COLLINS- This agrees with 635 -3 ARINC - Concurs 6 ATTACHMENT 1 to Part II, Figure II-A1-5, SPDU (page 2 of 2) (Doc 9741-AN/962, Part II, page II-A1-6)


Frame (N+21) slot 02 assignment code

ROCKWELL COLLINS- This agrees with 635 -3 ARINC - Concurs 7 ATTACHMENT 2 to Part II, FIELD CODING AND DESIGNATIONS, Item 48 (Doc 9741-AN/962, Part II, page II-A2-8)

The text of the third line of the item 48 should be modified as follows:

0 Low, medium or high priority slots reserved.ROCKWELL COLLINS- This agrees with 635 -3

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ARINC - Concurs 8 ATTACHMENT 2 to Part II, FIELD CODING AND DESIGNATIONS, Item 73 (Doc 9741-AN/962, Part II, page II-A2-10)

The text should be modified as follows:

A five-bit uplink sequence number embedded in the LPDU type field of the downuplink numbered data LPDU. The DU(S) value is encoded in bits 4 through 8 of the LPDU type field.ROCKWELL COLLINS- This agrees with 635 -3 ARINC - Concurs

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AN/962, Part II

Document Version: First Edition – 2000Sections of Documents Affected: …Coordinator: Loftur E. Jonasson Coordinator's Address: Iceland Telecom, Gufunes Com


Coordinator's Phone: +354 550 6538 Coordinator's Fax: +354 567 5230 Coordinator's E-mail Address: [email protected]: ClarificationProblem description:Background: Changes proposed by Professor Zhou

Zhuoren, China. These changes have been reviewed and accepted by ARINC and Rockwell Collins


1 Chapter 2, Physical Layer

1.1 In both of the Table II-2-3 and Table II-2-4 (Doc 9741-AN/962, Part II, page II-2-3), the fourth column should be modified as follows :

Code rate36 1611/236 1611/236 1611/236 1631/4

ROCKWELL COLLINS- This agrees with 635 -3 ARINC - Concurs

2 Chapter 3, Link Layer

2.1 The eighth cell of the first column of the Table II-3-1 (Doc 9741-AN/962, Part II, page II-3-2) should be modified as follows :

271316-630

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octetsROCKWELL COLLINS- This agrees with 635 New Draft Supp 4 (per my earlier mail to Buckwalter(ARINC) to modify Table 5-2. ARINC - Concurs

3 Chapter 4, Subnetwork Layer Protocols and Services

3.1 Paragraph 4.3.7.2.6 (Doc 9741-AN/962, Part II, page II-4-4), the text in the parentheses should be modified as follows :

(see 4.3.8.32)ROCKWELL COLLINS- This is correcting a misidentified cross reference in 9741-AN/962. ARINC - Concurs

3.2 Paragraph 4.3.7.3.2 (Doc 9741-AN/962, Part II, page II-4-4), the eighth line, HFSNDPG should be modified as HFSNDPX .

ROCKWELL COLLINS- This agrees with 635 -3 ARINC – Concurs

3.3 Paragraph 4.3.7.3.2 (Doc 9741-AN/962, Part II, page II-4-4), the twelfth line, SNDPX should be modified as HFSNDPX .ROCKWELL COLLINS- This agrees with 635 -3 ARINC - Concurs 3.4 Table II-4-1, HFNPDU type identifier encoding (Doc 9741-AN/962, Part II, page II-4-17)

a) The original sixth line is000010 CONNECTION REQUEST, NO CALLING NSAP ADD., NO CALLED NSAP ADD., WITH FACILITY FIELD, NO RESTRICTION ON

RESPONSEIt should be modified as follows : 000010 CONNECTION REQUEST, NO CALLING NSAP ADD., WITH CALLED NSAP ADD., NO FACILITY FIELD, NO RESTRICTION ON

RESPONSEROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC – Concurs

b) The original seventh line is000011 CONNECTION REQUEST, NO CALLING NSAP ADD., NO CALLED NSAP ADD., WITH FACILITY FIELD, NO RESTRICTION ON

RESPONSEIt should be modified as follows :000011 CONNECTION REQUEST, NO CALLING NSAP ADD., WITH CALLED NSAP ADD., WITH FACILITY FIELD, NO RESTRICTION

ON RESPONSEROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC - Concurs

c) The original 25th line is100000 CONNECTION REQUEST, NO CALLING NSAP ADD., NO FACILITY FIELD, WITH RESTRICTION ON RESPONSEIt should be modified as follows : 100000 CONNECTION REQUEST, NO CALLING NSAP ADD., NO CALLED NSAP ADD., NO FACILITY FIELD, WITH RESTRICTION ON

RESPONSEROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3.

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ARINC - Concurs

d) The original 26th line is100001 CONNECTION REQUEST, NO CALLING NSAP ADD., WITH FACILITY FIELD, WITH RESTRICTION ON RESPONSEIt should be modified as follows : 100001 CONNECTION REQUEST, NO CALLING NSAP ADD., NO CALLED NSAP ADD., WITH FACILITY FIELD, WITH RESTRICTION

ON RESPONSEROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC - Concurs

e) The original 27th line is100010 CONNECTION REQUEST, NO CALLING NSAP ADD., WITH FACILITY FIELD, WITH RESTRICTION ON RESPONSEIt should be modified as follows : 100010 CONNECTION REQUEST, NO CALLING NSAP ADD., WITH CALLED NSAP ADD., NO FACILITY FIELD, WITH RESTRICTION

ON RESPONSEROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC – Concurs

3.5 Table II-4-3 (Doc 9741-AN/962, Part II, page II-4-18), the second line of the left column, there is no definition on HFNDP , it should be modified as HFSNDP .ROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC - Concurs

3.6 Table II-4-8 (Doc 9741-AN/962, Part II, page II-4-21), the first cell of the left column should be modified as :

HFSNDPXDU received from remote HFSNDPX

ROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC - Concurs

3.7 Table II-4-10 (Doc 9741-AN/962, Part II, page II-4-23), in the note 1 and note 2, HFND should be modified as HFSND .ROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC - Concurs

3.8 Table II-4-13 (Doc 9741-AN/962, Part II, page II-4-25), the seventh line of the middle column should be modified as :

DCE INCOMING CALLROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC - Concurs

3.9 Table II-4-14, DCE actions at reset, interrupt, and flow control states (Doc 9741-AN/962, Part II, page II-4-26)

a) The state definition of j1 should be modified as : DTCE INTERRUPT READY


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b) The state definition of j2 should be modified as : DTCE INTERRUPT SENT


c) The state definition of f1 should be modified as : DTCE RECEIVE READY

ROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC – Concurs

d) The state definition of f2 should be modified as : DTCE RECEIVE NOT READY

ROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3.

3.10 Table II-4-16 (Doc 9741-AN/962, Part II, page II-4-27), note 6, second line, the text behind the comma should be modified as :

and discard indicates that the received packet is to be cleaned from the buffers.ROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC - Concurs

3.11 Table II-4-17 (Doc 9741-AN/962, Part II, page II-4-28), note 5, the text “d = diagnostic code” should be modified as “D = diagnostic code”.ROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC - Concurs

3.12 Table II-4-18, DTE effect on DCE reset states (Doc 9741-AN/962, Part II, page II-4-29)ROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC - Concurs

a) When packet received from DTE is RESET REQUEST, the effect on DCE at FLOW CONTROL READY d1 state should be modified as :

A = NORMAL (8.2) DS = d2 (forward)


b) In the note 2, “AES” should be deleted.ROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC - Concurs

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3.13 Table II-4-20, DTE effect on DCE flow control transfer states (Doc 9741-AN/962, Part II, page II-4-31)

a) The cell about the state g1 should be modified as follows : DCTE RECEIVE

READYg1

ROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3 ARINC - Concurs .

b) The cell about the state g2 should be modified as follows : DCTE RECEIVE

NOT READYg2


c) In the note 6, for consistent, P(R) should be modified as PR; or contrariwise, all PS be changed to P(S), and all PR be changed to P(R).ROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. It is consistent to use PR in this table. ARINC - Concurs

d) Recommendation: It is better to provide the definitions for PS, PR, RR, and RNR.ROCKWELL COLLINS- Rockwell Collins agrees with this suggestion. ARINC - Concurs

3.14 Table II-4-22 (Doc 9741-AN/962, Part II, page II-4-32), the fourth line of the left column should be modified as follows :

CALLEAR INDICATIONROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC – Concurs

3.15 Figure II-4-1, The HFSNL functions and the ATN subnetwork (Doc 9741-AN/962, Part II, page II-4-34)

The text in the left_top triangle cell of the HFDL aircraft station subsystem should be modified as :

HFSND (HFSNDPGA)ROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC - Concurs

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3.16 Figure II-4-2, HFSNDPX entities (Doc 9741-AN/962, Part II, page II-4-35) The text in the circle cells of the two HFDL aircraft station subsystems should be modified as : HFSNDPGA entityROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC - Concurs

3.17 The title of the Figure II-4-15 (Doc 9741-AN/962, Part II, page II-4-41) should be modified as : Throughput class negotiation (TCN) facility field formatROCKWELL COLLINS- This is correcting a mistake in a 9741-AN/962 table not in 635-3. ARINC – Concurs

4 Attachment 2 to Part II, SIGNAL UNIT FIELD DESCRIPTIONS, CODING AND DESIGNATIONS

4.1 FIELD DESCRIPTIONS (Doc 9741-AN/962, Part II, page II-A2-1)

a) The description of item number 50 should be modified as follows :UDR UPLINK DATA ROUATE

ROCKWELL COLLINS- This is correcting a mistake in 9741-AN/962 not in 635-3. ARINC – Concurs

b) The description of item number 53 should be modified as follows :SPDU VERSION

ROCKWELL COLLINS- This is correcting a mistake in 9741-AN/962 not in 635-3. ARINC – Concurs

4.2 Item 12, TDMA FRAME OFFSET (Doc 9741-AN/962, Part II, page II-A2-3) Following original text Code Function 0 Offset relative to a master TDMA

frame starting at exactly at 0000 UTC

should be modified as :

Code Function 0 - 12 Offset relative to a master TDMA

frame starting exactly at 0000 UTCROCKWELL COLLINS- This is correcting a mistake in 9741-AN/962 not in 635-3. 4.3 Item 21, LONGITUDE (Doc 9741-AN/962, Part II, page II-A2-4) The last sentence of the text of item 21 should be modified as :

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Positive numbers represent eastern latitudes longitudes, and negative values represent western latitudes longitudes.ROCKWELL COLLINS- This is correcting a mistake in 9741-AN/962 not in 635-3. ARINC – Concurs

4.4 Item 24, HFNPDU TYPE (Doc 9741-AN/962, Part II, page II-A2-4) The eighth line of the item 24 should be modified as follows : FFh D5h Frequency data downlink (optional)ROCKWELL COLLINS- This is correcting a mistake in 9741-AN/962 not in 635-3. ARINC – Concurs

4.5 Item 59, K (Doc 9741-AN/962, Part II, page II-A2-9) The original text is as follows :

59. K

A 4-bit field indicating the transmit window size for outstanding packet acknowledgements. The value is cal-culated as the transmit window size +1. Therefore the value can range from 1 to 16. The value is only used in RLS transmissions.

This text implies somewhat confusion. Who’s value can range from 1 to 16? Is it the K’ s value? If so, then it means that: the value of K can range from 1 to 16; however, the value is calculated as the transmit window size +1, then the transmit window size can range from 0 to 15. Is this the original intention? What’s the meaning about “transmit window size = 0”? On the other hand, when we refer to the octet 6 in Figure II-A1-8 (Doc 9741-AN/962, Part II, page II-A1-9), as follows :

0 0 0 0 k (transmit window size)

The bits 4 to 1 indicate the k (transmit window size). It does mean that the k (transmit window size) can range from 0 to 15. Does the k in Figure II-A1-8 equal to the K in item 59 above?

In order to resolve these confusions, if the original intention is k = K , and the transmit window size should range from 1 to 16, then we can make following modifications:

a) The item 59 should be modified as follows :

59. k

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This is the transmit window size specified by the HFDL ground station subsystem in the log-on confirm and log-on resume confirm LPDU for outstanding packet ack-nowledgements. The value of k can range from 1 to 16. It is only used in RLS transmissions. The four least significant bits of the octet 6 in the log-on confirm and log-on resume confirm LPDU is equal to k – 1. Such as, if all the four bits are set to 0, then k=1; if all the four bits are set to 1, then k=16.

ROCKWELL COLLINS- This is correcting a mistake in 9741-AN/962 which is also confusing in 635-3.Webelieve that all the references to k and window size in 635 should be reviewed before submitting supplement 4 for approval. ARINC - Concurs

b) The octet 6 in the log-on confirm and log-on resume confirm LPDU should be modified as follows :

0 0 0 0 k(transmit window size) -1

ROCKWELL COLLINS- This is correcting a mistake in 9741-AN/962 which is also confusing in 635-3.Webelieve that all the references to k and window size in 635 should be reviewed before submitting supplement 4 for approval. At a minimum, Attachment 2-10E should be changed to say " k (transmit window size) - 1" as this does. ARINC - Concurs

------------------------------------------------

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AN/962, Part II

Document Version: First Edition – 2000Sections of Documents Affected: …Coordinator: Loftur E. Jonasson Coordinator's Address: Iceland Telecom, Gufunes Com


Coordinator's Phone: +354 550 6538 Coordinator's Fax: +354 567 5230 Coordinator's E-mail Address: [email protected]: EditorialProblem description:Background: Further changes proposed by Rockwell

Collins, and verified by Professor Zhou Zhuoren, China


1 Table II-4-1, HFNPDU type identifier encoding (Doc 9741-AN/962, Part II, page II-4-17)

a) The original 32nd line is100111 CONNECTION REQUEST, WITH CALLING NSAP ADD., WITH CALLED NSAP ADD., WITH FACILITY FIELD RESTRICTION ON

RESPONSEIt should be modified as follows : 100111 CONNECTION REQUEST, WITH CALLING NSAP ADD., WITH CALLED NSAP ADD., WITH FACILITY FIELD, WITH

RESTRICTION ON RESPONSE

ROCKWELL COLLINS- This is correcting a mistake in 9741-AN/962 not in 635-3. ARINC - Concurs

2. Table II-4-3, title needs to be modified. It now contains the word “Diagnosweatic”, should be “Diagnostic”.

ROCKWELL COLLINS- This is correcting a mistake in 9741-AN/962 not in 635-3. ARINC - Concurs

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AN/962, Part II

Document Version: First Edition – 2000Sections of Documents Affected: Table II-3-3, Paragraph 3.1.3.3.1,

3.1.3.3.9, Coordinator: Loftur E. Jonasson Coordinator's Address: Iceland Telecom, Gufunes Com


Coordinator's Phone: +354 550 6538 Coordinator's Fax: +354 567 5230 Coordinator's E-mail Address: [email protected]: ClarificationProblem description:Background: Changes 1 – 3 proposed by Professor

Zhou Zhuoren, ChinaARINC basically agrees with these changes, but the proposed changes needs to be compared with the AEEC document and the documents made consistent.

Backwards compatibility: ?.Amendment Proposal: See Below:WG-M Status: Pending 2001-12-18

1 Table II-3-3. Information held by the aircraft and ground station subsystems (Doc 9741-AN/962, Part II, page II-3-3)

1.1 The fourth cell of the left column should be modified as follows:

D(N)vect – flags indicating if the HFDL ground station subsystem has negatively acknowledged D(A)+1…D(a)+8kROCKWELL COLLINS- This is correcting a definition in 9741-AN/962 which is also 635-3 (see Table 5-5). This is somewhat complicated by the fact that in uplinked acknowledgements, there are only 8 bits allowed for D(N)vect. What was intended for this table was to identify the field, and the fact that it is possibly a subset of the total outstanding transmissions (since the window range is 1-16). 635-3 explains this in section 5.2.4.2.3 and 5.2.4.2.4. What should be done is to have this table (and therefore 635-3 Table 5-5) use k, the window size. The commentary which describes the field that goes into the MPDU acknowledgment field should indicate that the transmitted D(N)vect contains only 8 bits, and therefore represents D(A)+1… D(A)+k or D(A)+1… D(A)+8 if

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k>8.Wethink that this would solve the problem in 9741-AN/962. 635-3 needs to be reviewed with a fine toothed comb to make sure that these definitions are correct and they should be made in accordance with the changes to 9741-AN/962. ARINC - Concurs

1.2 The fourth cell of the right column should be modified as follows:

U(N)vect – flags indicating if the HFDL aircraft station subsystem has negatively acknowledged U(A)+1…U(a)+8kROCKWELL COLLINS- This is correcting a definition in 9741-AN/962 which is also 635-3 (see Table 5-5). Per the item above: We think that this would solve the problem in 9741-AN/962. 635-3 needs to be reviewed with a fine toothed comb to make sure that these definitions are correct and they should be made in accordance with the changes to 9741-AN/962.

ARINC - Concurs

Recommendation: The text of paragraph 3.1.3 should refer to Table II-3-3 at somewhere.ROCKWELL COLLINS- This is also recommended by Rockwell Collins. However the likely reference point does not exist, except at the introduction to the topic. Possibly the sentence" Table II-3-3 identifies information pertinent to the Reliable Link Service protocol." could be added as the content of main paragraph 3.1.3. The section is currently empty.

ARINC - Concurs


2.1 The third sub-paragraph should be modified as follows:

- U(A)vect. A field of 8k bits, each of which represents whether or not each of the LPDUs starting from the sequence number U(A)+1 to U(A) + k has been acknowledged by the HFDL aircraft station subsystem, where k is the transmit window size. A bit set to one (1) indicates that the LPDU has been positively acknowledged.ROCKWELL COLLINS- This is correcting a definition in 9741-AN/962 which is also 635-3 (see Table 5-5). Per the item above: We think that this would solve the problem in 9741-AN/962. 635-3 needs to be reviewed with a fine toothed comb to make sure that these definitions are correct and they should be made in accordance with the changes to 9741-AN/962.

ARINC - Concurs

2.2 The fourth sub-paragraph should be modified as follows:

- U(N)vect. A field of k bits, each of which represents whether or not each of the LPDUs

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starting from the sequence number U(A) + 1 to U(A) + k has been negatively acknowledged by the HFDL aircraft station subsystem, where k is the transmit window size. For an LPDU to be considered negatively acknowledged, a U(R)/U(R)vect must be received at least three slots after the transmission of the LPDU. A bit set to one (1) indicates that the LPDU has been negatively acknowledged.

Note—The window size k can be larger than the 8 bits of the U(R)vect. Those LPDUs transmitted in the window, but not included in the U(R)vect, cannot be considered as either ACKed or NACKed.ROCKWELL COLLINS- This is attempting to correct confusion in 9741-AN/962 which is also 635-3 (see Table 5-5). We think that this does not quite solve the problem in 9741-AN/962. What this needs to say in the note is "The window size k can be larger than the 8 bits of the portion of U(R)vect sent in a downlink". 635-3 needs to be reviewed with a fine toothed comb to make sure that these definitions are correct and they should be made in accordance with the changes to 9741-AN/962.

ARINC – Concurs


3.1 The third sub-paragraph should be modified as follows:

- D(A)vect. A field of 8k bits, each of which represents whether or not each of the LPDUs starting from the sequence number D(A)+1 to D(A) + k has been acknowledged by the HFDL ground station subsystem, where k is the transmit window size. A bit set to one (1) indicates that the LPDU has been positively acknowledged.ROCKWELL COLLINS- This is correcting a definition in 9741-AN/962 which is also 635-3 (see Table 5-5). Per the item above: We think that this would solve the problem in 9741-AN/962. 635-3 needs to be reviewed with a fine toothed comb to make sure that these definitions are correct and they should be made in accordance with the changes to 9741-AN/962. ARINC - Concurs

3.2 The fourth sub-paragraph should be modified as follows:

- D(N)vect. A field of k bits, each of which represents whether or not each of the LPDUs starting from the sequence number D(A) + 1 to D(A) + k has been negatively acknowledged by the HFDL aircraftground station subsystem, where k is the transmit window size. For an LPDU to be considered negatively acknowledged, a D(R)/D(R)vect must be received at least three slots after the transmission of the LPDU. A bit set to one (1) indicates that the LPDU has been negatively acknowledged.

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ROCKWELL COLLINS- This is correcting a definition in 9741-AN/962 which is also 635-3 (see Table 5-5). Per the item above: We think that this would solve the problem in 9741-AN/962. 635-3 needs to be reviewed with a fine toothed comb to make sure that these definitions are correct and they should be made in accordance with the changes to 9741-AN/962.

ARINC - Concurs

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AN/962, Part II

Document Version: First Edition – 2000Sections of Documents Affected: ATTACHMENT 2 to Part II, FIELD

CODING AND DESIGNATIONSCoordinator: Loftur E. Jonasson Coordinator's Address: Iceland Telecom, Gufunes Com


Coordinator's Phone: +354 550 6538 Coordinator's Fax: +354 567 5230 Coordinator's E-mail Address: [email protected]: ClarificationProblem description:Background: First change, proposed by Professor

Zhou Zhuoren, addresses an inconsistency in the number of octets described, and a redundant definition. Rockwell Collins feels that a further review is needed on Change Proposal 2 (Fig II-4-6, Connection released HFNPDU format). Items 3 and 4 are from Rockwell Collins, and are agreed to by Professor Zhou..

Backwards compatibility: Yes.Amendment Proposal: See Below:WG-M Status: Pending 2001-12-18

1 ATTACHMENT 2 to Part II, FIELD CODING AND DESIGNATIONS, Item 15 (Doc 9741-AN/962, Part II, page II-A2-3)

a) Change the description of item 15 as “ASSIGNED FREQUENCY”; b) Change the FIELD CODING AND DESIGNATIONS of item 15 as:

15. ASSIGNED FREQUENCY(4 octets)

The assigned frequency contains two sub-fields, the FREQUENCY FIELD (3 octets, see item 69) and the MASTER FRAME SLOT OFFSET. (1 octet, bits 8 to 5 shall

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be set to “0”, bits 4 to 1 indicate the TDMA FRAME OFFSET, see item 12).

ROCKWELL COLLINS- This is attempting to correct the situation where two fields being defined have the same content but two different definitions. One field was contained in the text of 635-3 and the other in a figure. The one he suggests describing here is the one in the figure of attachment 2-10c, and it contains the frequency and master frame slot offset for an entry in the system table. The other item referenced here is item 69 which describes the frequency field portion of this item. We would have preferred a different solution to this problem: If you leave item 15 with no changes as a 3 octet field, and delete item 69, the redundant description of the 3 octets with some additional description of "order", you would not disturb the content of the document. We do not know if the document contains the words "assigned frequency" that the professor is trying to define (the combination of frequency and the four bit master frame offset. If the change is accepted as is, then the definition for item 69 should add some words that indicate order in the system table, and refer the reader to item 15, as amended for the format.

ARINC – Concurs 2. Figure II-4-6, Connection released HFNPDU format (Doc 9741-AN/962, Part II, page II-4-37)

a) The original octet 1 is 0 0 0 0 1 x x x

It should be modified as follows : 0 0 0 1 0 0 x 0

ROCKWELL COLLINS This is not in 635-3. The change does make 9741-AN/962 agree with the SATCOM specification (according to Inmarsat documentation).

ARINC – Concurs

b) The original octet 4 isClearing cause*

It should be modified as follows : Clearing cause

i.e. the star should be deleted, because the clearing cause field is necessary, and there is no indicator bit for indicating the clearing cause field present.

ROCKWELL COLLINS This is not in 635-3. The change does make 9741-AN/962 agree with the SATCOM specification (according to Inmarsat documentation).

ARINC - Concurs

3. Attachment 2 to Part II, item 17; “Frequency Search Counts”, replace paragraph with:“The first 16 bits shall contain the number of 32 second frames that the aircraft HFDL

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Function was out of communication in the previous flight leg. The second 16 bits shall contain the number of 32 second frames that the aircraft HFDL Function was out of communication in the current flight leg.”

ROCKWELL COLLINS This agrees with the change introduced in 635-3.

ARINC - Concurs

4. Attachment 2 to Part II, item 25, new codes have been added:

In the first table, reason codes for aircraft log-on denied, “03h Other”has been added,changing the last entry to “04h –FFh Reserved”.

In the second table, reason codes for aircraft log-off request, “07h Temporary Transceiver Shutdown”has been added, changing the last entry to “08h – FFh Reserved”

ROCKWELL COLLINS This agrees with the change introduced in 635-3.

ARINC - Concurs

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