electrical power is transferred from the electrical power junction block 132 to a second electrical power junction block 134 where the power is transferred via wiring harness 136 to fans 138 through 148 the electrical line to each fan 138 148 in the wiring harness 136 or on the backplane board 108 includes a polyfuse a type of self resetting fuse this arrangement permits each fan to operate regardless of a failure in any other fan also illustrated in fig3 is the electrical power interface 152 and the wiring harness to provide electrical power to the power supplies 120 and 122 the back side of power switch 96 is illustrated in fig3 also illustrated in fig3 is the back side of connector 80 which may be used for example to permit a keyboard or other device to interface with the router 10 via cable 156 to junction 158 on sbc 116 the back side of d sub connector 84 is illustrated in fig3 connector 84 is in communication with sbc 116 via cable 160 and junction 162 the back side of d sub connector 88 which functions to permit a monitor or other display device to be interfaced with the router 10 is illustrated in fig3 it too is in communication with sbc 116 via cable 166 to junction 170 the back side of rj 45 connector 92 is illustrated in fig3 which is in turn in communication with sbc 116 via cable 168 and.