3com S7906E Guide D’Installation Rapide

 

1-3 

Figure 1-2 Rear panel of the S7902E 

 

(1) COM port for monitoring PoE (RS485) 

(2) COM port for monitoring PoE (RS232) 

(3) Grounding screws 
(4) RTN terminal (+) of external PoE power supply 
(5) Negative terminal (–) of external PoE power supply (–46 V to –55 V)  

 

There are two DC power input (PoE power supply input) terminals and two COM ports (monitor ports) 

on the rear panel of the chassis. 

 

z 

The S7900E series are Power over Ethernet (PoE) capable, that is, they can supply power to 

devices such as IP phones, wireless access points, and network cameras connected to their 

Ethernet ports through twisted pair cables. 

z 

For the S7902E and S7903E-S, the external PoE power supply is connected to the PoE power 

supply input terminals on the rear panel, while for the other models of the S7900E series, the 

external PoE power supply is connected to a power module. For details, refer to section 

“

” on page 

 and section “

” on page 

. 

 

 shows the front panel of the S7903E-S.