Specifications

A.15 Token Ordering of Trees or Dual Rings
A–36 FDDI Configuration Capabilities
Figure A–29 Token Flow through Dual Ringed DEChub 900 Modules
Note that the front panel A port is shown on the module in slot 4, and the B port is
shown on the module in slot 8. Therefore, the token, which is flowing on the primary
ring, enters the hub at slot 4 and exits from slot 8.
A ring map, showing the order of token flow, is based on the ordering of the MACs
in the ring. In this example, MultiChassis Manager configures the backplane so that
the token enters the A port of slot 4, encounters the MAC for slot 4, and the next
MAC it sees is in slot 1. The token then flows, in order, through the MACs in slots
1,2,3, 6, and finally slot 8. Therefore, a ring map records the token order as:
4>1>2>3>6>8.
To accomplish this ordering, the Hub Manager automatically connects the B port of
Slot 4 to the A port of Slot 1. The process is repeated for the other modules, so that
the token always flows in the correct order.
Secondary
LKG-10072-96F
Primary
A
B
A B
B
B
Slot 1234567 8
Token order on ring map = 4>1>2>3>6>8
= Location of MAC
BA
A B A B
A