REQUIREMENTS/SPECIFICATIONS
2-10
2.3.2
Ring Speed
The concentrator module ring speed can be set to either 4 Mbit/s or
16 Mbit/s. The ring speed is automatically set to a default setting at
power on. The default ring speed can be selected by positioning a
network speed jumper on the board (Refer to Chapter 3, Installing
the Concentrator Module
, to learn how to set the network speed
jumper.) The default setting can be overridden by changing the ring
speed through local or remote network management software.
2.3.3
Ring Order
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. Multiple Token Ring
boards are automatically attached (when possible) at power on, but
the configuration can be modified via network management
software, attaching or detaching adjacent boards and, as a result,
changing the ring sequence.
In a network using a concentrator module attached to other Token
Ring boards via the FNB, the ring order is in MMAC slot number
order, and then port number order within each Token Ring board.
Example: TRMIM-22A in slot 1 with ports 2, 5, 8, & 12 in use.
TRMIM-22A in slot 2 with ports 1, 5, 7, 11, & 12 in use.
An FNB is installed in the MMAC.
Ring order for this example is Slot 1 ports 2, 5, 8, 12, out to the FNB,
then to Slot 2 ports 1, 5, 7, 11, 12 out to the FNB; then, returning to
Slot 1 ports 2, 5, etc.
2.3.4
LANVIEW LEDs
There are a number LEDs on the front panel of the concentrator
modules. While the quantity of port-specific LEDs differ between
the 12 and 24 port concentrator modules, all four concentrator
