3com S7906E Guide D’Installation Rapide

 

1-9 

The backplane in the integrated chassis of the S7900E series implements high-speed data exchange 

as well as management & control signal exchange between SRPUs and LPUs. 

The backplane mainly provides the following functions: 

z 

Interconnection between cards 

z 

Card hot-swapping 

z 

Automatic slot recognition 

z 

Automatic chassis type recognition 

z 

Distributed power supply to the system. The S7906E-V has two backplanes: signal backplane and 

power supply backplane. The power supply backplane is connected to the power modules and is 

also connected to the signal backplane with an internal cable. 

z 

Connection of the signal cable that monitors the fan tray and power supply 

The S7900E series support a variety of power modules, as listed in 

. 

Table 1-3 Power module models of the S7900E series 

PSR320-A 1 

U 

AC 

No 

PSR320-D 1 

U 

DC 

No 

PSR650-A 1 

U 

AC 

No 

PSR650-D 1 

U 

DC 

No 

PSR1400-A 3 

U 

AC 

No 

PSR1400-D 3 

U 

DC 

No 

PSR2800-ACV 3 

U 

AC 

No 

 

Table 1-4 Features of power modules 

Protection functions 

Support input under-voltage protection, output over-voltage protection, 
short-circuit protection, over-current protection, and overheat protection

1+1 hot backup support 

Support 1 + 1 hot backup and current sharing 

Hot swap support 

Support hot swap with the power switch turned off while the device is in 
operation 

 

Typically, the S7902E and the S7903E-S use 1U power modules, while the other models of the S7900E 

series use 3U power modules. 

The S7900E series support a large variety of card types, and system power consumption of a switch 

varies with different types of cards in use. You can choose an appropriate power module model for your 

switch based on its system power consumption.