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2.3.2 Ring Sequence
When multiple token ring boards (set to the same ring speed) are
installed in adjacent slots within an MMAC, they can be attached
via the FNB to create a larger ring network. The default
configuration for a token ring repeater automatically links it to the
boards in the adjacent slots at power on. However, the
configuration can be modified via network management software,
attaching or detaching adjacent boards, thus creating separate rings
or changing ring configurations.
When a repeater is installed, the ring sequence starts at the
externally accessible Ring-In port. If the repeater is detached from
other token ring boards (by software, incompatible ring speed or
empty adjacent slots), the ring sequence is restricted to the repeater
and goes from the Ring-In port to each of the TCU ports, in
ascending port number order, and then out the Ring-Out port.
When multiple token ring boards are installed in consecutive slots
and attached via the FNB, the sequence is in ascending slot number
order. When the repeater is attached via the FNB to other token ring
boards, the ring sequence begins at the Ring-In port of the repeater,
threads through the TCU ports on the repeater and is routed out,
via the FNB, to the next (higher slot number) token ring board on
the bus. An empty slot or non-token ring board causes the FNB
trunk connection to loop back to the first token ring board in the
sequence. From there it continues to thread through the Token Ring
boards and TCU ports until it returns to the repeater, and finally to
the Ring-Out port.
Example:
TRMIM-22 in slot 1 with ports 2, 5, 8, & 12 in use.
TRRMIM-2AT in slot 2 with ports 1, 2, 3, and 5 in use.
TRMIM-22 in slot 3 with ports 1, 5, 7, 11, & 12 in use.
An FNB is installed in the MMAC.
All three boards are attached via the FNB.
The ring sequence for this example is from Slot 2, Ring-In port
to ports 1, 2, 3, and 5, then out the FNB to Slot 3, ports 1, 5, 7, 11,
REQUIREMENTS/SPECIFICATIONS
Page 2-13
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