APS Information Base

This is a collection of variables that are passed between layers, in order to exchange information. These variables can be specified or obtained from a layer through its management service. The APS information base comprises the constants and attributes required to manage the APS layer of a device. This database may also include the access control list, which stores the security material.

The constants that define the characteristics of the APS sub-layer are presented below:

• The maximum number of octets contained in a non-complex descriptor.
• The maximum number of retries allowed after a transmission failure.
• The maximum number of seconds to wait for an acknowledgement to a transmitted frame.
• The minimum required size of the APS duplicate rejection table.
• Fragmentation parameter - The maximum number of unacknowledged frames that can be active at once.
• Fragmentation parameter - The standard delay between sending two blocks of a fragmented transmission.
• The minimum number of octets added by the APS sub-layer to an ASDU.

The attributes of the AIB are listed below:

• The current set of binding table entries in the device
• TRUE if the device should become the ZigBee Coordinator on startup, FALSE if otherwise.
• The mask of allowable channels for this device to use for network operations.
• The 64-bit address of a network to form or to join.
• The current set of group table entries.
• The value to be used for the NonmemberRadius parameter when using NWK layer multicast.
• The current set of permission configuration items.
• A flag controlling the use of insecure join at startup.
• Fragmentation parameter - the standard delay, in milliseconds, between sending two blocks of a fragmented transmission

Security-Related AIB Attributes:

• A set of key-pair descriptors containing master and link key pairs shared with other devices.
• Identifies the address of the device's Trust Center.
• The period of time a device will wait for an expected security protocol frame (in milliseconds).

See also:
APS Functions and Data Structures
APS Frame format
APS Status Parameters

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