User`s guide

ZigBee™ Protocol Tools

TABLE 3-9: ZIGBEE™ PROTOCOL APS DUPLICATE PACKET REJECTION SELECTION

Configuration Option Description

Table Size

The ZigBee™ protocol allows the application layer to individually tag each packet to

be transmitted with a unique identifier called a sequence number. The sequence

number is used by the receiving application to distinguish among the many packets it

asynchronously receives. Each device maintains a Duplicate table which contains

the sequence numbers of the packets it receives. Upon receiving a new packet it

compares the list of sequence numbers already stored against the new sequence

number, and if there is a match, the new packet is tagged as a duplicate and is

discarded. Enter the number of entries that will be maintained in the duplicate table.

Expiration Time (seconds) Entries in the Duplicate Table are time-stamped and are kept for only a limited

amount of time. After that time has elapsed the entry is marked as expired. This

makes room for new entries to be added to the table, as well as allowing for the

reuse of a sequence number after a certain amount of time has elapsed. Enter the

time in seconds for how long any entry in the Duplicate Table will remain valid before

being marked as expired.