Redundancy is must!!!
Today one of my customer asked me whether 3750 support RPS(redundant power supply) !!! no worry man it do, i replied, but very soon i found it to be partially true. I have seen in datasheets about RPS but i decide to dig it deeper. Cisco is offering a separate 1 RU device 2300, its basically a redundant power system for internal power supply failure. It can support up to six device at a time (you need to plug the special cable to appliance to the router/switch) and at max can provide two active backups (if u purchase two power supply). One cable come with the bundle and you need to purchase spare if u need to backup other devices too. hmmm the appliance is not very cheap but i think its worthy it cost near about 3000 USD. the coolest thing you can even prioritize fail over, means say core switch has more priority then access layer so if both failed at same time it will backup core first.
What models did it support
Switches: 3750-E, 3560 E, 3750, 3560, 3550, 2960, 2950, CE 500 (Select models)
Router: 3825, 2851, 2821, 2811
The catch is you need to go for right power supply for example 700 Watt AC PS donot support support 3750E series but do support plain 3750 so watch it out first.
1- PWR-RPS2300 RPS 2300 chassis
2- C3K-PWR-750WAC Catalyst 3750-E/3560-E 750W AC power supply
3-C3K-PWR-1150WAC Catalyst 3750-E/3560-E 1150W AC power supply
4- CAB-RPS2300-E= Spare RPS Cable RPS 2300 Cat 3750E/3560E Switches
5-CAB-RPS2300= Spare RPS Cable for Cisco Redundant Power System 2300