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This chapter contains general site requirements and recommendations for all Cisco MGC hardware components and contains the following sections:
Use the information in this section as a guideline for installing your system safely.
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Warning Only trained and qualified personnel should be allowed to install or replace this equipment. |
Make sure that these basic spacing, temperature, and safety requirements are met.
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Warning Make sure that your rack is bolted to the floor. |
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Warning To prevent bodily injury when mounting or servicing this unit in a rack, you must take special precautions to ensure that the system remains stable. The following guidelines are provided to ensure your safety: |
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Warning Two people are required to lift the chassis. Grasp the chassis underneath the lower edge and lift with both hands. To prevent injury, keep your back straight and lift with your legs, not your back. To prevent damage to the chassis and components, never attempt to lift the chassis with the handles on the power supplies or on the interface modules. These handles were not designed to support the weight of the chassis. |
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Warning Make sure that your equipment rack is properly ventilated. |
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Warning To prevent the system from overheating, do not operate it in an area that exceeds the maximum recommended ambient temperature of 104°F (40°C) for the Netra t 112x and Netra t 140x and maximum recommended ambient temperature of 95°F (35°C) for the Sun E450. |
Consider the following issues when preparing to unpack and move your system:
System chassis are not intended to be moved frequently. Before you install the equipment, ensure that your site is properly prepared. Proper preparation keeps you from having to move the chassis later to accommodate power sources and network connections.
A minimum of two people are required to lift a chassis. Whenever you lift a chassis or any heavy object, follow these guidelines:
The following guidelines will help to ensure your safety and protect the equipment. This list does not cover all potentially hazardous situations, so be alert.
The port adapters and power supplies in the router shelves are designed to be removed and replaced while the Cisco MGC hardware is operating without presenting an electrical hazard or damage.
Follow these basic guidelines when working with any electrical equipment.
In addition, use the following guidelines when working with any equipment that is disconnected from a power source, but is still connected to telephone wiring or other network cabling.
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Warning Read the installation instructions before you connect the system to its power source. |
Although the carrier helps protect the boards, use an antistatic strap whenever handling the network processing engine, I/O controller, and port adapters. Handle the carriers by the handles and the carrier edges only; never touch the boards or connector pins.
Following are guidelines for preventing ESD damage:
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Caution For safety, periodically check the resistance value of the antistatic strap. The measurement should be from 1 through 10 megohm (Mohm). |
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Note Ankle straps only works with conductive floors or mats. |
The environmental monitoring functionality in the Cisco MGC hardware protects the equipment from potential damage from overvoltage and overtemperature conditions. After installation, make sure that the site maintains normal ambient temperatures in accordance with the specifications shown in the "Site Environment Specifications" section. Keep the area around the chassis as free from dust as is practical.
The following sections address the site environment requirements for the Cisco MGC hardware.
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Note To assure normal operation and avoid unnecessary maintenance, plan your site configuration and prepare your site before installation. |
Following are guidelines for setting up the plant wiring and cabling at your site. When planning the location of the new system, consider the distance limitations for signaling, EMI, and connector compatibility. Each issue and its effect on Cisco MGC hardware site planning is described in the sections below.
When wires are run for any significant distance in an electromagnetic field, interference can occur between the field and the signals on the wires. The potential presence of interference has two implications for the construction of plant wiring:
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Note To predict and remedy strong EMI, you might also need to consult experts in radio frequency interference (RFI). |
Follow these guidelines to reduce the possibility of extraneous interference and damage from EMI pulses:
The size of your networks and the distances between connections depend on the type of signal, the signal speed, and the transmission media (the type of cabling used to transmit signals). For example, standard coaxial cable has a greater channel capacity than twisted-pair cabling and can transmit signals more clearly for a greater distance.
The distance and rate limits in the following descriptions are the IEEE (Institute of Electrical and Electronics Engineers) recommended maximum speeds and distances for signaling.
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Note Cisco recommends that you do not exceed specified transmission rate and distance limits. However, if you understand the electrical problems that might arise and can compensate for them, you can obtain good results with rates and distances greater than those shown here. For example, the recommended maximum rate for V.35 is 2 Mbps. Still, it is commonly used at 4 Mbps without any problems. Be advised that you exceed the recommended limits at your own risk. |
When preparing your site for network connections to the Cisco MGC hardware, you should consider a number of factors related to each type of interface:
For ordering information for any additional special equipment that you might require, contact a Cisco customer service representative. Keep in mind, however, that the Cisco MGC hardware is preconfigured to meet your specifications. All devices, cables, documentation, and miscellaneous parts should be included with the system.
When planning your rack installation, consider the following guidelines:
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Caution To prevent chassis overheating, never install the Cisco MGC hardware in a room that is not properly ventilated or air conditioned. |
In addition to the preceding guidelines, review the precautions for avoiding overtemperature conditions in the following section, "Site Environment Specifications."
Table 2-1 lists the general operating and nonoperating environmental site requirements. However, a measurement that is approaching the minimum or maximum of a range indicates a potential problem. You can maintain normal operation by anticipating and correcting environmental anomalies before they approach a maximum operating range. For additional equipment specifications, see the "Cisco MGC Product Components" section of "Cisco Media Gateway Controller Product Introduction." and the "Billing and Maintenance Server Product Components" section in Appendix A.
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Note Refer to the appropriate Sun Service Manual for current specifications. |
| Specification | Minimum | Maximum |
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Temperature, ambient operating (continuous) | | |
Temperature, ambient operating (short term) | | |
Temperature, ambient nonoperating and storage | | |
Relative humidity, ambient (noncondensing) operating | | |
Relative humidity, ambient (noncondensing) nonoperating and storage | | |
Altitude, operating | | |
Altitude, nonoperating | | |
Planning a proper location for the Cisco MGC hardware and the layout of your equipment rack or wiring closet are essential for successful operation. Equipment placed too close together or inadequately ventilated can cause system overtemperature conditions. In addition, chassis panels made inaccessible by poor equipment placement can make system maintenance difficult.
The following are precautions that can help avoid problems during installation and ongoing operation.
Follow these general precautions when planning your equipment locations and connections:
Observe these precautions when planning power connections to your Cisco MGC hardware:
Posted: Thu Jun 8 05:15:26 PDT 2000
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