Dell 7x0N manual Pin Function, Bypasspresent Return grounded internally

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Pin	Function
1 and 2	Relay drive: +5.0 V DC
3 and 4	Bypass_enable

5Bypass_present

6Return: grounded internally

dual-attached FDDI fiber optic card optical bypass connector

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24 Dell PowerVault 7x0N Systems — Connecting to ATM and FDDI Networks