
Configuring FDDI Services
117344-A Rev. A 3-19
Editing FDDI Path Attributes
FDDI nodes exchange frames using the Timed-Token Protocol (TTP). The TTP
defines how the token target rotation time (TTRT) is set, the length of time a node
can hold the token, and how a node initializes the ring.
Each node is responsible for monitoring the integrity of the ring. By using a
minimum valid transmission time (TVX), nodes can detect a break in ring activity.
If the interval between token receptions exceeds the value of the TVX, the node
reports an error condition and initiates the claim process to restore ring operation.
The TTRT carried in claim frames issued by the FDDI station are known as path
attributes. F
igure 3-2 illustrates their relationship.
Figure 3-2. Range of Values for FDDI Path Attributes
You can set FDDI path attributes by:
• Specifying the Minimum TVX
• Specifying the Maximum TTRT
• Specifying the Requested TTRT
0 ms 2.5 ms 1336.9344 ms
TVX
lower
bound
T_Max lower bound
Requested TTRT
LS0015A
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