Technical data

Within the token mechanism for the active stations, various procedures are
defined for the following special situations:
➣
Initializing the logical token ring
➣
Duplication of the token
➣
Loss of the token
➣
Addition or deletion of an active station in the logical ring
The way in which the SINEC L2/L2FO network functions results in two
special cases:
1. When only
one station is active
and
all others are passive
, the bus
operates on a
master-slave principle
.
2. When
all stations are active
the technique is
token passing
.
A token rotation takes a certain amount of time. The maximum permitted
rotation time must be programmed and is known as the target rotation time.
Even when there is a large amount of data traffic, the set target rotation
time must be kept to. To keep within this time, SINEC L2/L2FO uses a
principle explained below.
System Overview B8976060/02
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