Cabletron Systems SPECTRUM TRMMIM - Manual (Page 44)

Using the TRMMIM Hub View
2-28 Managing the Hub at the Module Level
Managing the Hub at the Module Level
At the module level, you can configure the module’s FNB left and right
connections and FNB Bypass state, set board speed and operating mode, and
enable all station ports, all ring ports, or all ports on the module.
Controlling Token Ring FNB Multiplexer Connections
You can control the configuration of your Token Ring network by changing the
FNB multiplexers – that is, the way modules connect to their neighbors through
the MMAC Flexible Network Bus (FNB).
By wrapping a Token Ring module’s FNB left and right connections, you can
physically disconnect a module from the FNB. Enabling a module’s FNB Bypass
state causes its station ports to be isolated from the ring, while the module itself
remains physically connected to the FNB.
The following diagram shows how you view the module display in the Hub View
to check the FNB left and right connections, as well as the FNB Bypass state, of the
hub modules.
Figure 2-14. Bypass State and FNB Connection Symbols
There are two methods that you can use to control the FNB left and right
connections for Token Ring MIMs; you can click the mouse on the FNB symbols in
the Hub View FNB Status/Control box, or you can use the Module FNB
Configuration window, available via the Module menu. There are also two ways
to control the module’s FNB Bypass state; you can click the mouse on the
module’s FNB Bypass state box in the Hub View, or use the Module FNB
Configuration window to toggle the module’s FNB Bypass state between INS
(inserted) or BYP (bypassed).
FNB Left
connection
disabled.
Module 7 FNB
Right Connection
enabled
Module 6 FNB
Left Connection
enabled
INSerted: the
module is inserted
into the ring.
Individual station
ports on the module
can still be
BYPassed.
FNB Right
connection
disabled.