Understanding OLDI in Air Traffic Control Systems

 
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Bangkok, Thailand
28 to 31 October2014
2
 
By the end of the Presentation you will have a:
By the end of the Presentation you will have a:
 
basic understanding of the need for exchange of data
in Air Traffic Control (ATC);
an overview of SYSCO standard co-ordination and
basic transfer messages as they are used in most ATM
systems;
understanding of SYSCO terminology;
definition of Standard OLDI message types;
purpose of Standard OLDI messages;
timing of the transmission of Standard OLDI messages;
system responses to Standard OLDI messages.
APC AIDC/OLDI Seminar - Celso Figueiredo
3
 
What’s OLDI?
What’s OLDI?
 
 
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Flights which are being provided with an ATC service
are transferred from one ATC unit to the next in a
manner designed to ensure complete safety.
In order to accomplish this, it is a standard procedure
that the passage of each flight across the boundary of
the areas of responsibility of the two units is co-
ordinated between them before the flight reaches the
boundary.
In OLDI, and in the ATM systems, we call this process
the 
Coordination Phase
.
APAC AIDC/OLDI Seminar - Celso Figueiredo
4
 
What’s OLDI?
What’s OLDI?
 
 
2
2
 
 
After the receipt of coordination information, the
receiving controller uses this information to provide
view of the traffic in relation to other aircraft and
airspace features.
When the flight arrives at, or adjacent to, the
boundary between the ATC units, control of the flight
is transferred to the next unit.
In OLDI, and in the ATM systems, we call this the
Transfer Phase
.
APAC AIDC/OLDI Seminar - Celso Figueiredo
5
 
What’s OLDI?
What’s OLDI?
 
 
3
3
 
When carried out by telephone, the passing of data on
individual flights is a major support task at ATC units.
The operational use of connections between Flight Data
Processing Systems (FDPS) at ACCs replaces such verbal
“estimates”.
This can be achieved using ICAO messages sent by AFTN. This
process is supported by most ATM systems.
AFTN messages allow for a limited flow of standard data
between ATC units. The requirement for an increase in the data
transfer requirements led to the development of On-Line Data
Interchange (OLDI) within Europe in the early nineteen eighties.
APAC AIDC/OLDI Seminar - Celso Figueiredo
6
 
What’s OLDI?
What’s OLDI?
 
 
4
4
 
In order to facilitate implementation, common rules
and message formats were elaborated and agreed by
the agencies concerned and incorporated in the
EUROCONTROL Standard for On-Line Data Interchange.
This process is also referred to as 
SYSCO
 (
System
Assisted Coordination
).
The OLDI standard is produced to support the
continuing development of such facilities in compliance
with the requirements of EATCHIP
1
.
1 
EUROCONTROL ATC Harmonization and Integration Programme
APAC AIDC/OLDI Seminar - Celso Figueiredo
7
 
SYSCO
SYSCO
, brief description
, brief description
 
 
System Assisted Co-ordination (SYSCO) is a
EUROCONTROL protocol for co-ordination and transfer
between controllers.
In the ATM systems the protocol is used between ATC
centers and between ATC sectors.
 
OLDI stands for: 
On Line Data Interchange
.
APAC AIDC/OLDI Seminar - Celso Figueiredo
8
 
OLDI Messages
OLDI Messages
 
 
OLDI messages are exchanged between ATC units to
provide co-ordination and transfer of control
information.
 
We will now look at the terminology used in most ATM
systems during the co-ordination and transfer process.
APAC AIDC/OLDI Seminar - Celso Figueiredo
9
 
SYSCO/OLDI Definitions
SYSCO/OLDI Definitions
 
Co-ordination Entry/Exit Point (COP in/out)
Is the agreed point, on or adjacent to the boundary between ATC
areas of responsibility, used in a co-ordination sequence and referred
to in co-ordination messages.
In the ATM systems these points are qualified depending on whether
they are viewed as an exit ‘COP 
in
’ or entry ‘COP 
out
’ point.
Transfer Flight Level (TFL)
This is the level used in co-ordination messages as the level that the
flight will be cleared to when transferring from one controller to
another.
In the ATM systems this level is qualified depending on whether it is
viewed as the exit ‘
XFL
’ level or planned entry ‘
PEL
’ level.
APAC AIDC/OLDI Seminar - Celso Figueiredo
10
 
SYSCO/OLDI Definitions
SYSCO/OLDI Definitions
 
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Is the level that the pilot is currently instructed to fly at. It may be
different to the TFL mentioned above, but should normally be the
same as the TFL when the flight is handed over to the next controller.
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Is the speed (indicated airspeed – IAS, or Mach number) that the
pilot is currently instructed to fly at. It is used by controllers to
maintain the required separation between flights.
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Is the heading, in degrees magnetic, that the pilot is currently
instructed to fly.
APAC AIDC/OLDI Seminar - Celso Figueiredo
11
 
We will now look at the OLDI
We will now look at the OLDI
messages and their purpose.
messages and their purpose.
APAC AIDC/OLDI Seminar - Celso Figueiredo
12
 
OLDI Messages Definitions
OLDI Messages Definitions
 
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Initial notification and updates flight plan information
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Automatic update of FPL data with estimate information
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Notification and pre-departure co-ordination where flight time to COP is too short
for ACT message
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To transmit revisions to co-ordination data (time, level, code, COP)
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Automatically generated message by receiver to indicate receipt of transmitted
message.
APAC AIDC/OLDI Seminar - Celso Figueiredo
13
 
OLDI Messages Definitions
OLDI Messages Definitions
 
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At the end of the co-ordination phase, to signify the change from Coordination to
Transfer phase. Includes control data (CFL, AHDG, ASP)
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To transmit changes to control data during the Transfer Phase 
(updates 
TIM
 data)
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Sent by transferring controller to indicate flight has been instructed to change
frequency
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Message to the transferring unit to indicate two-way RTF contact has been
established with the flight
APAC AIDC/OLDI Seminar - Celso Figueiredo
14
 
Basic OLDI procedure.
Basic OLDI procedure.
APAC AIDC/OLDI Seminar - Celso Figueiredo
15
 
Prior to FIR entry
Prior to FIR entry
At a predefined number of 
minutes
 prior to the COP, an 
ABI 
is sent.
FIR (first sector)
FIR (first sector)
Provides:
Provides:
- Missing FPL data
- Missing FPL data
- ABI + revisions
- ABI + revisions
- SSR code to facilitate
- SSR code to facilitate
  early correlation
  early correlation
ABI
ABI
SP time
FIR boundary
APAC AIDC/OLDI Seminar - Celso Figueiredo
16
 
LAM
 is returned.
 
If the information sent in the ABI needs to be
updated, it is achieved by sending another
ABI message containing the revised data.
What is sent in response?
What is sent in response?
APAC AIDC/OLDI Seminar - Celso Figueiredo
17
 
Prior to FIR entry
Prior to FIR entry
At a predefined number of 
minutes
 or 
distance
 prior to the COP, an
ACT 
is sent. (
coord. phase
)
Airspace (sector)
Airspace (sector)
Provides:
Provides:
- Coordination data
- Coordination data
- Performs SSR code
- Performs SSR code
  retention check
  retention check
- code/callsign
- code/callsign
   correlation
   correlation
ACT
ACT
SP time/
distance
FIR boundary
APAC AIDC/OLDI Seminar - Celso Figueiredo
18
 
LAM
 is returned.
What is sent in response?
What is sent in response?
APAC AIDC/OLDI Seminar - Celso Figueiredo
19
 
What if the aircraft departs from too close to
What if the aircraft departs from too close to
the COP to allow an 
the COP to allow an 
ACT
ACT
 to be sent?
 to be sent?
APAC AIDC/OLDI Seminar - Celso Figueiredo
20
 
Close to FIR entry
Close to FIR entry
A 
PAC 
is used. A 
PAC
 replaces  the 
ABI
 and/or 
ACT
.
Airspace (sector)
Airspace (sector)
Provides:
Provides:
- notification or pre-
- notification or pre-
departure coordination
departure coordination
- missing flight plan
- missing flight plan
data
data
Can contain a SSR code
Can contain a SSR code
request
request
PAC
PAC
ACT time/
distance
FIR boundary
APAC AIDC/OLDI Seminar - Celso Figueiredo
21
 
If the information sent in the 
PAC
 message
provides an update of ETD but does not
include coordination data it is treated like an
ABI
 on reception.
If the 
PAC
 message contains coordination
data (COP, ETO and TFL) it is treated similar
to an 
ACT
 on reception.
PAC Messages
PAC Messages
APAC AIDC/OLDI Seminar - Celso Figueiredo
 
22
 
What if revisions to coordination are required?
What if revisions to coordination are required?
 
APAC AIDC/OLDI Seminar - Celso Figueiredo
23
 
Revision of coordination required
Revision of coordination required
A 
REV 
is used.
Airspace (sector)
Airspace (sector)
Provides:
Provides:
Automatic notification of:
Automatic notification of:
- Code/RVSM change
- Code/RVSM change
- Transfer level change
- Transfer level change
- ETO at the COP change
- ETO at the COP change
- Can also change route /
- Can also change route /
  COP
  COP
REV
REV
FIR boundary
APAC AIDC/OLDI Seminar - Celso Figueiredo
24
 
LAM
 is returned and a FPL created if
the sector responsible for the control
of the flight can be identified.
What is sent in response?
What is sent in response?
APAC AIDC/OLDI Seminar - Celso Figueiredo
 
25
 
Transfer of Communication and Control
Transfer of Communication and Control
 
APAC AIDC/OLDI Seminar - Celso Figueiredo
26
 
Transfer initiation
Transfer initiation
At a predefined 
distance
 or 
time
 prior to the COP, a 
TIM
 is sent. If
distance and time are set to 0,
    
TIM
 is not automatically sent
.
Airspace (sector)
Airspace (sector)
Signifies:
Signifies:
- end of coordination phase
- end of coordination phase
- start of transfer phase
- start of transfer phase
- forwards Executive
- forwards Executive
Control data (AHDG, CFL,
Control data (AHDG, CFL,
ASP) to the accepting
ASP) to the accepting
controller
controller
TIM
TIM
SP time/
distance
APAC AIDC/OLDI Seminar - Celso Figueiredo
27
 
Not before the flight has been coordinated.
Automatically at a (SP) distance/time from 
COP out
.
When the above SP’s are set to ‘0’, the 
TIM
 is not
automatically sent.
Regardless of the SP, 
TIM
 message sending is also
triggered when on certain controller actions that
will be covered later.
A 
TIM
 is acknowledged by a 
LAM
.
What is sent?
What is sent?
APAC AIDC/OLDI Seminar - Celso Figueiredo
28
 
Transfer initiation
Transfer initiation
After the 
TIM
, any changes to specific FDR fields result in a 
SDM
being sent
.
Airspace (sector)
Airspace (sector)
Notifies changes for
Notifies changes for
which approval is not
which approval is not
required:
required:
- CFL
- CFL
- ASP
- ASP
- AHDG
- AHDG
SDM
SDM
SP
APAC AIDC/OLDI Seminar - Celso Figueiredo
29
 
COF 
is sent.
What is the last step?
What is the last step?
APAC AIDC/OLDI Seminar - Celso Figueiredo
30
 
Transfer Completion
Transfer Completion
A 
COF
 is sent on controller ‘Transfer’ input (not an
automatic function)
.
Airspace (sector)
Airspace (sector)
- Manually initiated
- Manually initiated
- A TIM is also sent if COF
- A TIM is also sent if COF
sent before the automatic
sent before the automatic
TI event or if SPs for TIM
TI event or if SPs for TIM
sending are set to ‘0’
sending are set to ‘0’
COF
COF
APAC AIDC/OLDI Seminar - Celso Figueiredo
31
 
LAM 
is returned.
What is sent in response?
What is sent in response?
APAC AIDC/OLDI Seminar - Celso Figueiredo
32
 
MAS
 may be manually initiated by
the accepting controller.
And finally…
And finally…
APAC AIDC/OLDI Seminar - Celso Figueiredo
 
Not mandatory if a 
COF
 is used.
Acknowledged by a 
LAM
.
33
 
Transfer Completion
Transfer Completion
A 
MAS
 is sent on controller ‘Assume’ input.
Airspace (sector)
Airspace (sector)
- Manually initiated
- Manually initiated
MAS
MAS
APAC AIDC/OLDI Seminar - Celso Figueiredo
34
Standard OLDI Messages
Standard OLDI Messages
APAC AIDC/OLDI Seminar - Celso Figueiredo
Transfer Phase
Transfer Phase
Coordination
Coordination
Phase
Phase
Notification
Notification
Phase
Phase
35
 
Here is the process for handling OLDI
messages.
OLDI Message Reception
OLDI Message Reception
APAC AIDC/OLDI Seminar - Celso Figueiredo
36
 
On reception a 
syntax check 
is performed.
If error, put in OLDI Queue for manual processing.
After syntax check a 
semantic
 check is performed.
If error, put in OLDI Queue for manual processing.
In both cases 
LAM
 is 
not
 sent.
When no error, further processing takes place :
LAM
 sent: associate with previous message or
if no previous message, a warning is displayed.
OLDI Message Reception
OLDI Message Reception
APAC AIDC/OLDI Seminar - Celso Figueiredo
37
 
No error - associated processing performed.
Successful
 - Acknowledgement message sent.
 
Successful
: 
ABI
, 
PAC
, 
ACT
 - system tries to retrieve first
controlling sector.
sector determined, acknowledgement message sent.
sector cannot be determined, message put in OLDI Queue,
no acknowledgement message sent.
Unsuccessful
 Other - put in OLDI Queue, no acknowledgement
message sent.
OLDI Message Reception
OLDI Message Reception
APAC AIDC/OLDI Seminar - Celso Figueiredo
38
 
Basic SYSCO Principles and
Basic SYSCO Principles and
Standard OLDI Communication.
Standard OLDI Communication.
That completes:
That completes:
APAC AIDC/OLDI Seminar - Celso Figueiredo
 
39
 
APAC AIDC/OLDI Seminar - Celso Figueiredo
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Air Traffic Control systems use the OLDI process to ensure safe transfer of flights between different ATC units. OLDI involves the coordination and transfer phases, where controllers exchange data to maintain air traffic safety. The use of standardized messages and online data interchange has improved efficiency in managing flight transfers.


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  1. APAC SIP on ASBU B0-FICE AIDC Implementation Seminar Basic SYSCO Principles and Standard OLDI Communication EUR Environment ICAO EUR/NAT Office Celso Figueiredo Regional Officer ANS - ATM Bangkok, Thailand 28 to 31 October2014

  2. By the end of the Presentation you will have a: basic understanding of the need for exchange of data in Air Traffic Control (ATC); an overview of SYSCO standard co-ordination and basic transfer messages as they are used in most ATM systems; understanding of SYSCO terminology; definition of Standard OLDI message types; purpose of Standard OLDI messages; timing of the transmission of Standard OLDI messages; system responses to Standard OLDI messages. APC AIDC/OLDI Seminar - Celso Figueiredo 2

  3. Whats OLDI? Flights which are being provided with an ATC service are transferred from one ATC unit to the next in a manner designed to ensure complete safety. In order to accomplish this, it is a standard procedure that the passage of each flight across the boundary of the areas of responsibility of the two units is co- ordinated between them before the flight reaches the boundary. In OLDI, and in the ATM systems, we call this process the Coordination Phase. 1 APAC AIDC/OLDI Seminar - Celso Figueiredo 3

  4. Whats OLDI? 2 After the receipt of coordination information, the receiving controller uses this information to provide view of the traffic in relation to other aircraft and airspace features. When the flight arrives at, or adjacent to, the boundary between the ATC units, control of the flight is transferred to the next unit. In OLDI, and in the ATM systems, we call this the Transfer Phase. APAC AIDC/OLDI Seminar - Celso Figueiredo 4

  5. Whats OLDI? When carried out by telephone, the passing of data on individual flights is a major support task at ATC units. The operational use of connections between Flight Data Processing Systems (FDPS) at ACCs replaces such verbal estimates . This can be achieved using ICAO messages sent by AFTN. This process is supported by most ATM systems. AFTN messages allow for a limited flow of standard data between ATC units. The requirement for an increase in the data transfer requirements led to the development of On-Line Data Interchange (OLDI) within Europe in the early nineteen eighties. 3 APAC AIDC/OLDI Seminar - Celso Figueiredo 5

  6. Whats OLDI? In order to facilitate implementation, common rules and message formats were elaborated and agreed by the agencies concerned and incorporated in the EUROCONTROL Standard for On-Line Data Interchange. This process is also referred to as SYSCO (System Assisted Coordination). The OLDI standard is produced to support the continuing development of such facilities in compliance with the requirements of EATCHIP1. 1 EUROCONTROL ATC Harmonization and Integration Programme 4 APAC AIDC/OLDI Seminar - Celso Figueiredo 6

  7. SYSCO, brief description System Assisted Co-ordination (SYSCO) is a EUROCONTROL protocol for co-ordination and transfer between controllers. In the ATM systems the protocol is used between ATC centers and between ATC sectors. OLDI stands for: On Line Data Interchange. APAC AIDC/OLDI Seminar - Celso Figueiredo 7

  8. OLDI Messages OLDI messages are exchanged between ATC units to provide co-ordination and transfer of control information. We will now look at the terminology used in most ATM systems during the co-ordination and transfer process. APAC AIDC/OLDI Seminar - Celso Figueiredo 8

  9. SYSCO/OLDI Definitions Co-ordination Entry/Exit Point (COP in/out) Is the agreed point, on or adjacent to the boundary between ATC areas of responsibility, used in a co-ordination sequence and referred to in co-ordination messages. In the ATM systems these points are qualified depending on whether they are viewed as an exit COP in or entry COP out point. Transfer Flight Level (TFL) This is the level used in co-ordination messages as the level that the flight will be cleared to when transferring from one controller to another. In the ATM systems this level is qualified depending on whether it is viewed as the exit XFL level or planned entry PEL level. APAC AIDC/OLDI Seminar - Celso Figueiredo 9

  10. SYSCO/OLDI Definitions Cleared flight Level (CFL) Is the level that the pilot is currently instructed to fly at. It may be different to the TFL mentioned above, but should normally be the same as the TFL when the flight is handed over to the next controller. Assigned Speed (ASP) Is the speed (indicated airspeed IAS, or Mach number) that the pilot is currently instructed to fly at. It is used by controllers to maintain the required separation between flights. Assigned Heading (AHDG) Is the heading, in degrees magnetic, that the pilot is currently instructed to fly. APAC AIDC/OLDI Seminar - Celso Figueiredo 10

  11. We will now look at the OLDI messages and their purpose. APAC AIDC/OLDI Seminar - Celso Figueiredo 11

  12. OLDI Messages Definitions ABI Initial notification and updates flight plan information Advance Boundary Information Message ACT Automatic update of FPL data with estimate information Activate Message PAC Notification and pre-departure co-ordination where flight time to COP is too short for ACT message Preliminary Activate Message REV To transmit revisions to co-ordination data (time, level, code, COP) Revision Message LAM Automatically generated message by receiver to indicate receipt of transmitted message. Logical Acknowledgement Message APAC AIDC/OLDI Seminar - Celso Figueiredo 12

  13. OLDI Messages Definitions TIM At the end of the co-ordination phase, to signify the change from Coordination to Transfer phase. Includes control data (CFL, AHDG, ASP) Transfer Initiation Message SDM To transmit changes to control data during the Transfer Phase (updates TIM data) Supplementary Data Message COF Sent by transferring controller to indicate flight has been instructed to change frequency Change of Frequency Message MAS Message to the transferring unit to indicate two-way RTF contact has been established with the flight Manual Assumption of Communications Message APAC AIDC/OLDI Seminar - Celso Figueiredo 13

  14. Basic OLDI procedure. APAC AIDC/OLDI Seminar - Celso Figueiredo 14

  15. Prior to FIR entry At a predefined number of minutes prior to the COP, an ABI is sent. FIR (first sector) SP time Provides: - Missing FPL data - ABI + revisions - SSR code to facilitate early correlation ABI FIR boundary APAC AIDC/OLDI Seminar - Celso Figueiredo 15

  16. What is sent in response? LAM is returned. If the information sent in the ABI needs to be updated, it is achieved by sending another ABI message containing the revised data. APAC AIDC/OLDI Seminar - Celso Figueiredo 16

  17. Prior to FIR entry At a predefined number of minutes or distance prior to the COP, an ACT is sent. (coord. phase) Airspace (sector) SP time/ distance Provides: - Coordination data - Performs SSR code retention check - code/callsign correlation ACT FIR boundary APAC AIDC/OLDI Seminar - Celso Figueiredo 17

  18. What is sent in response? LAM is returned. APAC AIDC/OLDI Seminar - Celso Figueiredo 18

  19. What if the aircraft departs from too close to the COP to allow an ACT to be sent? SP time/ distance APAC AIDC/OLDI Seminar - Celso Figueiredo 19

  20. Close to FIR entry A PAC is used. A PAC replaces the ABI and/or ACT. Airspace (sector) ACT time/ distance Provides: - notification or pre- departure coordination - missing flight plan data Can contain a SSR code request FIR boundary PAC APAC AIDC/OLDI Seminar - Celso Figueiredo 20

  21. PAC Messages If the information sent in the PAC message provides an update of ETD but does not include coordination data it is treated like an ABI on reception. If the PAC message contains coordination data (COP, ETO and TFL) it is treated similar to an ACT on reception. APAC AIDC/OLDI Seminar - Celso Figueiredo 21

  22. What if revisions to coordination are required? t1 t0 FL 310 FL 290 APAC AIDC/OLDI Seminar - Celso Figueiredo 22

  23. Revision of coordination required A REV is used. Airspace (sector) Provides: Automatic notification of: - Code/RVSM change - Transfer level change - ETO at the COP change - Can also change route / COP REV FIR boundary APAC AIDC/OLDI Seminar - Celso Figueiredo 23

  24. What is sent in response? LAM is returned and a FPL created if the sector responsible for the control of the flight can be identified. APAC AIDC/OLDI Seminar - Celso Figueiredo 24

  25. Transfer of Communication and Control APAC AIDC/OLDI Seminar - Celso Figueiredo 25

  26. Transfer initiation At a predefined distance or time prior to the COP, a TIM is sent. If distance and time are set to 0, TIM is not automatically sent. Airspace (sector) SP time/ distance Signifies: - end of coordination phase - start of transfer phase - forwards Executive Control data (AHDG, CFL, ASP) to the accepting controller TIM APAC AIDC/OLDI Seminar - Celso Figueiredo 26

  27. What is sent? Not before the flight has been coordinated. Automatically at a (SP) distance/time from COP out. When the above SP s are set to 0 , the TIM is not automatically sent. Regardless of the SP, TIM message sending is also triggered when on certain controller actions that will be covered later. A TIM is acknowledged by a LAM. APAC AIDC/OLDI Seminar - Celso Figueiredo 27

  28. Transfer initiation After the TIM, any changes to specific FDR fields result in a SDM being sent. Airspace (sector) SP Notifies changes for which approval is not required: - CFL - ASP - AHDG SDM APAC AIDC/OLDI Seminar - Celso Figueiredo 28

  29. What is the last step? COF is sent. APAC AIDC/OLDI Seminar - Celso Figueiredo 29

  30. Transfer Completion A COFis sent on controller Transfer input (not an automatic function). Airspace (sector) - Manually initiated - A TIM is also sent if COF sent before the automatic TI event or if SPs for TIM sending are set to 0 COF APAC AIDC/OLDI Seminar - Celso Figueiredo 30

  31. What is sent in response? LAM is returned. APAC AIDC/OLDI Seminar - Celso Figueiredo 31

  32. And finally MAS may be manually initiated by the accepting controller. Not mandatory if a COF is used. Acknowledged by a LAM. APAC AIDC/OLDI Seminar - Celso Figueiredo 32

  33. Transfer Completion A MASis sent on controller Assume input. Airspace (sector) - Manually initiated MAS APAC AIDC/OLDI Seminar - Celso Figueiredo 33

  34. Standard OLDI Messages ABI/PAC ACT/PAC REV TIM SDM COF A LAM LAM LAM LAM LAM LAM MAS B LAM A B Coordination Phase Notification Phase Transfer Phase APAC AIDC/OLDI Seminar - Celso Figueiredo 34

  35. OLDI Message Reception Here is the process for handling OLDI messages. APAC AIDC/OLDI Seminar - Celso Figueiredo 35

  36. OLDI Message Reception On reception a syntax check is performed. If error, put in OLDI Queue for manual processing. After syntax check a semantic check is performed. If error, put in OLDI Queue for manual processing. In both cases LAM is not sent. When no error, further processing takes place : LAM sent: associate with previous message or if no previous message, a warning is displayed. APAC AIDC/OLDI Seminar - Celso Figueiredo 36

  37. OLDI Message Reception No error - associated processing performed. Successful - Acknowledgement message sent. Successful: ABI, PAC, ACT - system tries to retrieve first controlling sector. sector determined, acknowledgement message sent. sector cannot be determined, message put in OLDI Queue, no acknowledgement message sent. Unsuccessful Other - put in OLDI Queue, no acknowledgement message sent. APAC AIDC/OLDI Seminar - Celso Figueiredo 37

  38. That completes: Basic SYSCO Principles and Standard OLDI Communication. APAC AIDC/OLDI Seminar - Celso Figueiredo 38

  39. Thank You APAC AIDC/OLDI Seminar - Celso Figueiredo 39

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