3Com 3C780 User Guide - Page 66
Installing an Optical Bypass Switch
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2-26 Installing the Hub Installing an Optical Bypass Switch In many network environments, mission-critical devices such as bridges, routers, and hubs should be connected to the primary dual ring only if they are equipped with an optical bypass switch (OBS). An optical bypass switch is a device that prevents ring wrap in the event a node is powered off. Using an optical bypass switch protects the integrity of the dual ring by rerouting the signal in case of a station malfunction: the trunk ring is not broken. If you want the protection provided by an optical bypass switch, purchase an optical bypass switch with the plug configuration shown in Figure 2-10. 3Com does not supply this device. B A 6-Pin mini-DIN MIC connectors Figure 2-10. Optical Bypass Switch
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