Process For Selecting Loop Master - Fujitsu MAA3182FC Series Manual

Step
[1] Transmits LISM with its own port
name to the next port.
[2] Receives LISM from the upper
loop port.
[3] Compares the port name with its
own port name and transmits
LISM with lower port name.
[4] Receives LISM from the upper
loop port.
[5] Compares the port name with its
own port name and transmits
LISM with lower port name.
[6] Receives LISM from the upper
loop port.
[7] Compares the port name with its
own port name and if they are the
same, the port becomes loop
master.
[8] Loop master transmits ARB (F0)
ans waits for the ARB (F0) comes
back.
[9] Loop master checks ARB (F0)
Note:
The value is assigned to each port uniquely in production.
Port Name n
LISM (n)
LISM (n+2) LISM (n)
LISM (n)
LISM (n+1) LISM (n)
LISM (n)
LISM (n) LISM (n)
<loop master> <non loop master>
ARB (F0)
ARB (F0)
Figure 1.11 Process for selecting Loop master
C141-E054-02EN
n+1 n+2
LISM (n+1) LISM (n+2)
LISM (n+1)
LISM (n) LISM (n+1)
LISM (n)
LISM (n) LISM (n)
LISM (n)
<non loop master>
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