The M5 and M10 Internet routers (see Figure 3.38) have a maximum aggregate bandwidth of 6.4 Gbps full duplex. Table 3.28 shows the physical specifications of the M5 and M10 routers, and Table 3.29 gives an overview of the major hardware components of the routers. Figure 3.38. M5 and M10 Internet Routers Chassis and Components
Table 3.28. M5 and M10 Routers Physical Specifications
Table 3.29. M5 and M10 Routers Major Hardware Components
The router chassis includes two metal ears, which can be used for either front-mounting or center-mounting, and two ESD points for use when servicing the router. The M5 and M10 routers have one Routing Engine. For more information, see "Routing Engine" on page 37. The FEB is located on the rear of the router above the power supplies (see Figure 3.39). It provides route lookup, filtering, and switching to the destination port. The FEB performs the function of the FPCs on other Juniper Networks routers. It communicates with the Routing Engine using a high-speed internal link that transfers routing table data from the Routing Engine to the forwarding table in the Internet Processor II ASIC. This link is also used to transfer routing link-state updates and other packets destined for the router from the FEB to the Routing Engine. The FEB is field- replaceable , but is not hot-removable or hot-pluggable. You must power down the router before removing or replacing the FEB. Figure 3.39. M5 and M10 FEB
The FEB contains processing components, including a 266-MHz CPU and supporting logic, Internet Processor II ASIC, Distributed Buffer Manager ASICs, and I/O Manager ASICs with corresponding SRAM; storage components, including four banks of 2-MB SRAM for forwarding tables associated with the ASICs, and 64-MB DRAM for the microkernel ; and system interfaces, including a 19.44-MHz reference clock for SONET/SDH PICs. The FEB also contains either 64-MB (on the M5 router) or 128-MB (on the M10 router) SDRAM, used as shared memory by the Distributed Buffer Manager ASIC. The craft interface (see Figure 3.40) allows you to view alarm status information and to perform some system control functions. The craft interface is located on the left front of the chassis, extending across the front below the PIC slots. The craft interface contains the alarm LEDs and lamp test button, Routing Engine ports, link and activity status lights, and PIC online/offline buttons . Figure 3.40. M10 Craft Interface
The router has two redundant, load-sharing power supplies, located at the lower rear of the chassis. The power supplies connect to the midplane, which distributes the output voltages produced by the power supplies to the router components. A single power supply can provide full power (up to 434 W) for as long as the router is operational. Redundancy is necessary only if one of the power supplies fails or is removed. Power supplies are hot-removable and hot-insertable, but you must turn off the power to the individual power supply before removing it from the chassis. Each power supply has a handle to facilitate removal from the chassis. When one power supply fails or is switched off, the other power supply immediately and automatically assumes the entire electrical load. The router supports both AC and DC power supplies. Table 3.30 lists the specifications for both types. You cannot mix both types in a single router. An enable control signal on the output connector ensures that the power supply is fully seated into the router midplane before the power 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. Table 3.30. M5 and M10 Routers Power Supply Specifications
The AC inlet is oriented to allow a standard right-angle power cord to exit to the right of the power supply. A power cord latching mechanism is provided for the use of straight power cords. DC power supply cables are 12-AWG, single- strand -count wire cable, with two leads. The cables connect to the input and return quick connect terminals on each DC power supply. The M5 and M10 router cooling system consists of a fan tray, located along the left side of the chassis, that provides side-to-side cooling (see Figure 3.41). The fan tray is a single unit containing four fans. It is hot-removable and hot-insertable, and connects directly to the router midplane. Figure 3.41. Air Flow through the M5 and M10 Chassis
The M5 and M10 router cable management system consists of two vertical pieces, each with a pair of metal hooks draped in a plastic shield, that attach to each side of the front of the chassis. The cable management system is designed to maintain the proper bend radius for optical cables and to keep installed cables organized and securely in place. The router has LEDs that display the status of various router components. Table 3.31 lists the LEDs on the craft interface and the individual router components. Table 3.31. M5 and M10 Routers LEDs
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