2.5 Common Ground Data Processing (GDP-C)
Type:  Object   
Status:  Proposed.  Version 1.0.  Phase 1.0.
Package: 2.0 Ground Data Processing (GDP)     Keywords:  
Detail:  Created on 11/25/2006.  Last modified on.11/25/2006.
GUID:  {054D7962-9C24-4dc3-9BD9-9E3AC15C524B}

2.5.1 Controller Pilot Data Communications (CPDC)
Type:  Object   
Status:  Proposed.  Version 1.0.  Phase 1.0.
Package: 2.0 Ground Data Processing (GDP)     Keywords:  
Detail:  Created on 11/24/2006.  Last modified on.2/3/2007.
GUID:  {D725AB0E-540C-499f-B2FA-5D27EB21E0ED}

The Controller Pilot Data Communications (CPDC) function manages the connection between the aircraft and one or more ground users.  It formats messages based on protocol structures supported by ground users and aircraft avionics and enforces inter-message (and possibly inter-process) rules. 

This function manages/uses three types of user access categories: 

(1) Eligible Users:  Only ground users can be eligible users and only a SINGLE user is granted eligible access at a time.  Communication Eligibility is used to send clearances and instructions to aircraft.  Eligibility verification is handled by identifying/confirming the 'eligible' user with the correct FDP.

(2) Permitted Users:  Only ground users can be permitted users and one or more users can be granted access to the same aircraft.  Non-clearance related types of messages are permitted, e.g., expects, notifications, advisories. Permitted verification is handled by adaptation data entry.

(3) Authorized Users:  Only aircraft users can be 'authorized' users.  Authorized access management is the same thing as managing the 'data authorities' as described in CPDLC communications.  It insures that only one ground entity can communicate with the aircraft at one time.  Note that while data authorities are described as being facility-based in CPDLC documentation, it is interpretted herein as being CPDC-function based.   Thus, transfer of data authority happens between instances of the CPDC function (e.g. domain-based, facility-based, sector-based, etc).

Embedded Elements
Element Detail Notes
Port 2.5.0.4 pCPDC.MSG

1.0

Port 2.5.0.5 pCPDC.MAAI

1.0

Port 2.5.0.2 CPDC.User_Port(s)

1.0
Connection port for users that which to send A/G CPDC communication.  Multiple users can each set up a port to talk to an aircraft.

Port 2.5.0.1 CPDC.System_Port

1.0

Port 2.5.0.3 CPDC.Admin_Port

1.0
This port is used to:
- setup permitted user list

CompositeStructure diagram: 2.5.1 Controller Pilot Data Communications (CPDC)
 

2.5.1.2 Manage CPDC Messages
Type:  Object   
Status:  Proposed.  Version 1.0.  Phase 1.0.
Package: 2.0 Ground Data Processing (GDP)     Keywords:  
Detail:  Created on 11/24/2006.  Last modified on.11/24/2006.
GUID:  {DD408CD0-3746-4e73-87CC-78E2AC129B5C}

Transaction management functions:
=============================
These sub-functions include:
　
中國航空網 m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：Functional Architecture for the Data Communication System(67)