3com 3C16895 ユーザーズマニュアル

C

HAPTER

 1: S

WITCH

 7750 C

OMPONENTS

Table 38 describes the specifications of the Switch 7750 power module.

The Switch 7750 power distribution box is installed on the chassis floor in the back 
of the chassis. It filters, connects, disconnects and distributes electrical current to 
the switch. 

The power distribution box for the 4-slot chassis has two inputs and each input 
has a separate ON/OFF switch. One input can support the normal operation of one 
power module. Both AC inputs must be connected and switched on to provide 
power to both power modules and to offer N+1 AC power redundancy. When 
two power modules are installed but only one AC power input is working, only 
one power module will operate. However, the Power Module LEDs on the Fabric 
display alarm information for the power module that is not working.

The power distribution box for the 7-slot chassis has two inputs and two ON/OFF 
switches. One input can support the normal operation of three AC power modules 
at the same time. When both AC power inputs are connected and switched on, 
the power distribution box offers N+1 AC power redundancy.

The Switch 7750 supports power-over-Ethernet (PoE). When the Switch 7750 is 
equipped with an external PoE power system and PoE-capable I/O modules, it can 
provide -48 V DC power to remote powered devices (PDs), such as IP phones, 
WLAN APs, and network cameras through twisted pair cable. 

Figure 26 illustrates the Switch 7750 PoE power system.

Figure 26   Switch 7750 PoE Power Supply

The Switch 7750 supports PoE external input power up to 2400 W.

Table 38   Specifications for Switch 7750 Power Modules

Input

100 V to 240 V, 47 to 63 Hz, 6 A

Maximum output

350 W