Cabletron Systems Ethernet Hubs manual Redundantly Connected Hub Device

Hub Redundancy Management

Figure 4-2. Redundantly Connected Hub Device

Primary Hub Device

MT8		MT8		IRB
5 S		1 5 S		1 S M
				BM
				ON	ON
				ST	RH
				RC	NK
				DN	DN
				CR	CR
4		2 4		PO	PO
				2
					C
					O
					N
R L	R L	R L	R L
6		3 6		3	C
					O
8		4 8		4	A
				NS LK
				TH	OF
				RH
				ETHE

Backup Inactive Circuit Primary Active Circuit

MT8		MT8		IRB
5 S		1 5 S		1 S M
				BM
				ON	ON
				ST	RH
				RC	NK
				DN	DN
				CR	CR
4		2 4		PO	PO
				2
					C
					O
					N
R L	R L	R L	R L
6		3 6		3	C
					O
8		4 8		4	A
				NS LK
				TH	OF
				RH
				ETHE

Secondary Hub Device

The following example illustrates redundancy between hubs.

Say that you have used redundant circuit management to create a connection between the Accounting Department and the Payroll Department of your company. These departments are on the same floor and have two repeaters between them on an Ethernet network. Suppose a system overload occurred

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