Juniper Networks M10, M5 manual PIC Offline Buttons, Power Supplies

Power Supplies

•CONSOLE—Connects the Routing Engine to a system console through an RS-232 (EIA-232) serial cable.

•AUX/MODEM— Connects the Routing Engine to a laptop, modem, or other auxiliary device through an RS-232 (EIA-232) serial cable.

For information about the pinouts for the connectors, see “Cable Connector Pinouts” on page 171.

PIC Offline Buttons

An offline button for each PIC is located below the PIC slot along the bottom edge of the craft interface (see Figure 7). The button prepares the PIC for removal from the router when pressed. The buttons are labeled with the PIC slot numbers. The PIC slots on an M5 router and in the upper FPC on an M10 router are numbered from 0/0 (zero/zero) through 0/3, right to left. The PIC slots in the lower FPC on an M10 router are numbered from 1/0 (one/zero) through 1/3, right to left.

Power Supplies

The router uses either AC or DC power. There are two load-sharing, isolated power supplies located at the bottom rear of the chassis, as shown in Figure 3. The power supplies connect to the midplane, which distributes power to router components according to their individual voltage requirements. When the power supplies are installed and operational, they automatically share the electrical load. If a power supply stops functioning for any reason, the remaining power supplies instantly begin providing all the power the router needs for normal functioning and can provide full power indefinitely.

Mixing AC and DC power supplies is not supported. The two power supplies must be either both AC or both DC.

An enable control signal on the output connector of each power supply ensures that the supply is fully seated into the router midplane before the supply can be turned on. The enable pin prevents a user-accessible energy hazard, so there is no interlocking mechanism. The enable pin disables the voltage at the output connector if the power supply is not turned off before removal.

Power supplies are hot-removable and hot-insertable, as described in “Field-ReplaceableUnits (FRUs)” on page 3. To avoid electrical injury, carefully follow the instructions in “Replace an AC Power Supply” on page 98 and “Replace a DC Power Supply” on page 104.

16M5 and M10 Internet Routers Hardware Guide