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# LLC Fine-Tuning Parameters

Receive Window Size

Retry Timer

T1 Timer

T2 Timer

Ti Timer

Transmit Window Size

T1 Timer

  This parameter defines the amount of time the unit waits before entering a recovery/retry sequence. This value should be at least double the time it takes a frame to traverse the network.
  Range: 1 -- 25 seconds

T2 Timer

  This parameter delays the generation of an RR frame long enough to piggyback the acknowledgement onto an I frame. This value should be smaller than the T1 value.
  Range: 0 -- 99 tenths of a second
  Note: If you change the default LLC T2 timer value from 0, you must also set the Receive Window Size to a value that is equal to or less than half the Transmit Window Size.

Ti Timer

  This parameter sets the frequency at which an RR frame is generated, thus ensuring the network connection or logical link is up. This value should be greater than the T1 value.
  Range: 2 -- 50 seconds

Transmit Window Size

  This value defines the maximum number of I frames that can transmit before requiring an acknowledgment.
  Range: 1 -- 15 frames

Receive Window Size

  This value defines the maximum number of I frames that can be received before requiring an acknowledgment.
  If you change the T2 timer, this value must be equal to or less than half the transmit window size to maximize interleaving and bandwidth usage.
  Range: 1 -- 15 frames

Retry Timer

  This value defines the number of times a unit polls another unit if the I frame is unacknowledged, thus preventing premature ending of momentarily failed connections.
  Range: 1 20 times