Cisco 3640 4 SLOT ROUTER Specification Guide

If you are mounting a Cisco 3620 on a desktop, you must install the rubber feet that are supplied in the accessory kit. They
provide a space for air circulation. Peel the rubber feet from the adhesive strip, and attach one foot at each corner to the bottom
of the chassis.

If you place the Cisco 3620 or Cisco 3640 router on a desktop, do not place anything that weighs more than
10 lb (4.5 kg) on top of the chassis.

You must connect the chassis to a reliable earth ground; the ground wire must be installed in accordance with local electrical
safety standards.

For NEBS-compliant grounding, use size AWG 6 (13 mm

2

) wire and the ground lug provided in the accessory kit.

For NEC-compliant grounding, use size AWG 14 (2 mm

2

) or larger wire and an appropriate user-supplied ring terminal.

For EN/IEC 60950-compliant grounding, use size AWG 18 (1 mm

2

) or larger wire and an appropriate user-supplied ring

terminal.

To connect the chassis to a reliable earth ground, perform the following steps:

Attach the ground-lug bracket to the power supply, as shown in Figure 10 or Figure 11. Use a number 2 Phillips
screwdriver and the screw or screws that are already in the router chassis. Tighten the screws to a torque of 8 to 10 in-lb
(0.9 to 1.1 N-m).

For Cisco 3620 routers, use the power-supply retaining screw located at the bottom of the power supply.

For Cisco 3640 routers, use the two power-supply retaining screws: one at the lower left and one at the upper right.

A DC power supply is shown. The ground-lug bracket attachment is similar for an AC power supply and for a
Cisco redundant power supply (RPS).

15849

Bracket

Power
supply