Front and rear door. The front door is opened by grasping the wide end of the triangle-shapped door piece and pulling outward. It uses a key lock for security purposes that should open all the front doors in a multi-rack system. Note that the front door and rear door locks are keyed differently.

The rear door has a push-button key lock to prevent unauthorized access to the system. The rear doors have a master key that locks and unlocks all rear doors in a system made up of multiple racks. You cannot use the rear door key to secure the front door lock.

Cable entry/exit area. Cable access openings are located in the front floor and top of the rack. Cables are only attached to the front of the IRUs; therefore, cable management occurs primarily in the front and top of the rack. In the case of Dense router modules, cables are attached and routed to the top of the rack. NUMAlink cables pass through the top of the rack. I/O and power cables normally pass through the bottom of the rack.

Rack structural features. The rack is mounted on four casters; the two rear casters swivel. There are four leveling pads available at the base of the rack. The base of the rack also has attachment points to support an optional ground strap, and/or seismic tie-downs.

Power distribution units within the rack. A maximum of four single-phase power distribution units (PDUs) are needed per rack, depending on the number of IRUs. Each IRU requires one 5-outlet single-phase PDU. A three-phase power distribution unit has 18 outlet connections, of which up to 16 may be needed to power four IRUs. Each three-phase rack system houses a single PDU.

Figure 4-1. Tall (42U) Altix Rack and Front Lock