DP83955A Datasheet, PDF (28/54 Pages) National Semiconductor (TI) – LitE Repeater Interface Controller

5 0 Functional Description (Continued)
Jabber Protection
A repeater is required to disable transmit activity if the
length of its current transmission reaches the jabber protect
limit This is defined by the IEEE specification’s Tw3 time
The repeater disables output for a time period defined by
the Tw4 specification after this period normal operation
may resume
Figure 5-7 shows the effect of a jabber length packet upon a
LERIC based repeater system The JABBER PROTECT
state is entered from the SEND DATA state While the Tw4
period is observed the Inter-LERIC bus displays the IDLE
state This is misleading since new packet activity or contin-
uous activity (as shown in the diagram) does not result in
packet repetition This may only occur when the Tw4 re-
quirement has been satisfied
TL F 11240 – 13
Note 1 The IEEE Specification does not have a jabber protect state defined in its main state diagram this behavior is defined in an additional MAU Jabber Lockup
Protection state diagram
FIGURE 5-7 Jabber Protect
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