Chassis dimensions are listed in the physical specifications table for each router. For more information about chassis dimensions, see the router platform-specific hardware guide.
Each Juniper Networks router features a rigid sheet metal chassis that houses all of the router components. The chassis are designed to install into a variety of racks, including standard 19-inch equipment racks, telco center-mount racks, and four-post racks and cabinets. See Table 1 for the maximum number of each router type that can be installed into a rack. Each chassis includes mounting ears or support posts to facilitate rack mounting, and one or more points for connecting an electrostatic discharge (ESD) wrist strap for use when servicing the router.
Table 1: Maximum Number of Routers per Rack
Router or Routing Node
Maximum in Standard Rack
M5 and M10
Each chassis includes a midplane (called the backplane on an M40 router). The midplane transfers data packets to and from the FPCs, distributes power to router components, and provides signal connectivity to the router components for system monitoring and control.