M120 Router Chassis Description
The router chassis is a rigid sheet metal structure that houses all the other router components (see Figure 1, Figure 2, and Figure 3). The chassis measures 20.75 in. (52.71 cm) high, 17.43 in. (44.3 cm) wide, and 24.3 in. (61.7 cm) deep (from the front-mounting flanges to the rear of the chassis). The chassis installs in standard 800-mm (or larger) enclosed cabinets, 19-in. equipment racks, or telco open-frame racks. Up to four routers can be installed in one standard (48-U) rack if the rack can handle their combined weight, which can be greater than 900 lb (408.4 kg).
The chassis includes three electrostatic discharge points (banana plug receptacle). Two are located in the front of the chassis and one in the rear of the chassis.
 | Caution: Before removing or installing components of a router, attach an ESD strap to an ESD point and place the other end of the strap around your bare wrist. Failure to use an ESD strap can result in damage to the router. |
 | Warning: The router must be connected to earth ground during normal operation. |
Figure 1: Front View of a Fully Configured M120 Router Chassis
Figure 2: Rear View of a Fully Configured AC-Powered M120 Router Chassis
Figure 3: Rear View of a Fully Configured DC-Powered M120 Router Chassis
For chassis serial number information , see Displaying M120 Router Components and Serial Numbers.
