Cabletron Systems TRMMIM manual Managing the Hub at the Module Level

Using the TRMMIM Hub View

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.

INSerted: the
module is inserted
into the ring.		FNB Right
Individual station
ports on the module		connection
can still be		disabled.
BYPassed.
FNB Left
connection	Module 7 FNB	Module 6 FNB
disabled.
	Right Connection
		Left Connection
	enabled
		enabled

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).

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