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With Port Switching
FNB ring
segment B
FNB ring wrapped at TRMMIM's right FNB interface.
Figure A-1. FNB Segmentation Produces Two Isolated FNB Rings
Management of Segmented FNB Rings
When the FNB is segmented, as shown in Figure A-1., the modules on one
segment are isolated from modules on another FNB segment, and
management interfaces with one ring are isolated from other FNB
segments as well. Therefore, to receive full management support, each
FNB segment requires its own management interface; but as management
modules are added to the MMAC to manage these rings, the number of
slots available for concentrator modules is decreased, creating greater
power demands, and increasing the overall cost per port in the MMAC.
A.4 With Port Switching
Each port-switching MIM (e.g., TRXMIM), makes use of additional pins in
its FNB connector to create four vertically stacked, parallel FNB rings (as
illustrated in Figure A-2.). Therefore, whereas each single-ring (non
port-switching) MIM (e.g., TRMIM) provides access to only one ring (one
segment of the FNB), each port-switching MIM, provides access to four
FNB rings.
Page A-2
FNB ring
segment A
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