Network Level Performance Statistics for ATN Aircraft

From WikiLink
Revision as of 15:32, 6 February 2013 by Disaac (Talk | contribs) (Created page with "This page is intended to show the set of data link performance statistics at the level of the ATM Network i.e. all ANSPs. However not all data is ye...")

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

This page is intended to show the set of data link performance statistics at the level of the ATM Network i.e. all ANSPs. However not all data is yet available so that charts at the moment are based on a limited set of ANSPs.

The performance metrics are presented in the groups shown in the table below:

General Performance Measures

The General Performance Measures as the name implies give some general measures of overall system performance. It covers the following metrics:

  • Technical Round Trip Delay. The distribution of the delay between when a uplink CPDLC message is sent and the corresponding LACK message is received. This gives a good indication of the overall performance of the technical system (i.e. the ACSP, avionics and the ground end-system).


  • Provider Aborts Count. This counts the number of provider aborts as a percentage of the number of CPLDC sessions and shows the trend over the preceding 12 months.
  • CPDLC Technical Error Counts. This provides a count of the different technical errors encountered.

Context Management

The context management measures provide statistics about the usage of the context management application. It covers the following metrics:

  • DLIC Initiation Logon Counts. The number of unsuccessful logon attempts, the number of successful logon attempts followed by the establishment of a CPDLC connection, and the number of successful logon attempts that are not followed by the establishment of a CPDLC connection.
  • DLIC Contact Transaction Delay. The distribution of the delay between the ground system issuing a contact request and it receiving a contact response and the trend over the previous 12 months.
  • DLIC Contact Continuity. The probability that a contact request results in the reception of a contact response before the expiration timer expires.

CPDLC Ground Initiated Transactions

This presents statistics relating to CPDLC transactions that are initiated by the controller. Air initiated transactions and ground initiated transactions are analysed separately since they have different performance requirements. It covers the following metrics:

  • CPDLC Ground Initiated Transaction Delay. The delay between when the controller initiates the transaction to when the operational response is received.
  • CPDLC Ground Initiated Continuity. The probability that the CPDLC transaction completes before the expiration timer expires (120 seconds).
  • Uplink Message Usage. This presents counts of different groups of uplink messages; instructions, transfer of communications, level changes, speed changes, route changes and 'check stuck microphone' requests.
  • Uplink Error Counts. This presents a count of the different types of operational errors encountered.

CPDLC Air Initiated Transactions

This presents statistics relating to CPDLC transactions that are initiated by the flight crew. It covers the following metrics: