|
|
This chapter describes power and grounding requirements and instructions for connecting your Cisco MGC hardware to the network. This chapter contains the following sections:
Observe the following warnings before connecting and powering the Cisco MGC hardware.
 | Warning Only trained and qualified personnel should be allowed to install or replace this equipment. |
| Warning Do not touch the power supply when the power cord is connected. For systems with a power switch, line voltages are present within the power supply even when the power switch is off and the power cord is connected. For systems without a power switch, line voltages are present within the power supply when the power cord is connected. |
| Warning A voltage mismatch can cause equipment damage and may pose a fire hazard. If the voltage indicated on the label is different from the power outlet voltage, do not connect the chassis to that receptacle. |
| Warning Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects heat up when connected to power and ground and can cause serious burns or weld the metal object to the terminals. |
The Sun Netra t 1120 is DC-powered. The unit has redundant power feeds. Refer to the
Sun Netra t 1120/1125 Installation and Basic Maintenance Guide that shipped with the product for DC source site requirements, overcurrent protection, grounding instructions, and power cord installation instructions. The Sun system must be connected to the power source and grounded per Sun's installation instructions.
The Sun Netra t 1125 is AC-powered. Refer to the Sun Netra t 1120/1125 Installation and Basic Maintenance Guide that shipped with the product for AC source site requirements, overcurrent protection, grounding instructions, and power cord installation instructions. The Sun system must be connected to the power source and grounded per Sun's installation instructions.
The Sun E450 is AC-powered. Power cords are not supplied with the unit. Refer to the Sun E450 Installation and Basic Maintenance Guide that shipped with the product for AC source site requirements, overcurrent protection, and grounding instructions, and power cord installation. The Sun system must be connected to the power source and grounded per Sun's installation instructions.
 | Warning Read the installation instructions before you connect the system to its power source. |
 | Tips For a complete list of the related documentation that ships with this product, see the "Related Documentation" section. |
Both the ARU and A/B Switch use DC power. The power connectors for both units are identical, although they are wired with opposite polarity to each other. Pin 1 is minus on the ARU, and pin 1 is positive on the A/B Switch. (See Figure 5-1.)
| Warning The DC-powered A/B Switch relies on the building's installation for short-circuit (overcurrent) protection. Ensure that a fuse or circuit breaker no larger than 3A is used. |
| Warning The ARU relies on the building's installation for short-circuit (overcurrent) protection. Ensure that a fuse or circuit breaker no larger than 1 A is used. |
 | Caution Ensure that the proper power cable is terminated to each unit. The power cables are marked ARU and A/B Switch. No damage will occur to the units if the wrong cable is terminated, but the A/B Switch will not power up if the wrong cable is attached. |
| Warning This equipment is intended to be grounded. Ensure that the host is connected to earth ground during normal use. |
Earth ground connections are made in several ways depending upon the equipment. All AC-powered equipment is connected to earth ground over the ground conductor within the power cable. The DC-powered equipment provides earth ground connections via grounding studs or through the mounting hardware used to secure the equipment to the frame. The use of toothed lockwashers are recommended for securing all of the equipment (AC or DC) to the equipment frame.
The ARU and A/B Switch require a secure earth ground connection between their chassis and the equipment frame. Make the ground connection by using a toothed lockwasher underneath the head of one of the mounting screws used to secure the chassis to the frame or cabinet. The top right mounting hole, when viewed from the front, is designated for the earth ground. This hole is denoted by the earth ground symbol (Figure 5-2). Although only one toothed lockwasher is required to make a ground connection, Cisco recommends the use of toothed lockwashers under all the mounting screws.
| Warning This equipment is intended to be grounded. Ensure that the host is connected to earth ground during normal use. |
The racked configurations provided by Cisco must be securely connected to earth ground. Make the earth ground connection from the designated point on the rear surface of the equipment rack. This point is identified by the earth ground symbol which appears as an upside down tree graphic (see Figure 5-2). Use an 8-gauge copper conductor for the ground conductor.
| Warning This equipment is intended to be grounded. Ensure that the host is connected to earth ground during normal use. |
The racked configurations provided by Cisco must be securely connected to earth ground. Make the earth ground connection from the number 6 ground lug provided in the bottom of the frame. This point is identified by the earth ground symbol, which appears as an upside down tree graphic (see Figure 5-2). Use an 8-gauge copper conductor for the ground conductor.
Posted: Fri Dec 10 00:32:50 PST 1999
Copyright 1989-1999©Cisco Systems Inc.