32 Chapter 1 BayStack 380 Switch212859-ABack panelThe switch back panel is shown in Figure 4. Table 3 describes the components onthe back panel.Figure 4 BayStack 380 Switch back panelRedundant power supply unit (RPSU) and uninterruptiblepower supply (UPS)The redundant power supply connector allows you to connect a backup powersupply unit to the BayStack 380 Switch. Nortel Networks provides an optionalredundant power supply unit (RPSU) for this purpose. The BayStack 10 PowerSupply Unit (Order number AA0005005) is a hot-swappable power supply unitthat provides uninterrupted operation to as many as four BayStack 380 Switchesin the event that any of the switch power supplies fail.The BayStack 10 Power Supply Unit has a powerful, modular redundant anduninterruptible power supply (UPS) functionality in a single chassis. It providesscalable power redundancy and protection to your networking equipment. Themodules fit into the right-hand side of the rear of the chassis. The UPS andassociated battery pack module fit into the front of the chassis.Table 3 Components on the BayStack 380 Switch back panelItem Description1 DC-DC module for the Redundant power supply unit(RPSU)2 AC power receptacle100-240 V-50-60Hz 2A2 110474EA
