When installing the chassis do not block the exhaust fan at the rear of the chassis. This will cause the unit to overheat.You are here: Hardware Installation and Maintenance > 3 CSP Chassis Installation > Pre-Installation Considerations
Pre-Installation Considerations
Installation Location Requirements
The CSP must be installed in a restricted area, such as a dedicated equipment room or data closet.
The temperature, humidity, and altitude of the site must fall within the specifications listed in the Environmental Specifications section for the respective chassis. In general, a typical office environment satisfies these conditions. A temperature-controlled environment is preferable. See the Environmental Specifications for the chassis you are using.
You must allow 0.334 m (1.1 ft.) of space in front of and behind the switch to ensure proper ventilation. Avoid putting the switch inside a cabinet with closed doors unless you can provide sufficient ventilation inside the cabinet. In addition, be sure to allow sufficient space for performing maintenance tasks such as removing fan trays and cards.
When installing the chassis do not block the exhaust fan at the rear of the chassis. This will cause the unit to overheat.
The CSP chassis can be mounted in either a 19-inch or 23-inch rack. The mounting brackets on the switch adjust to accommodate either width. The mounting brackets can also be mounted at either the front or the middle of a CSP 2090 and CSP 2110 chassis. The CSP 2040 can only be mounted from the front.
When mounting the equipment in the rack, ensure that it does not pose a hazardous condition due to uneven mechanical loading.
You can have a redundant configuration with two power sources, where one serves as a backup to the other, assuming that you have two power supply cards installed. In this configuration, the power cards operate in load-sharing mode.
Uninterruptible Power Supply Option
If your site has frequent power interruptions, consider using an Uninterruptible Power Supply (UPS) for your host PC. You can prevent downtime by running your application on a PC that receives its AC power from batteries during a power failure. In the Telco environment, Excel recommends a DC power system that includes battery backup to ensure continuous service during a commercial power failure.
Guidelines for Wiring and Grounding
Proper wiring and grounding of the chassis is extremely important. Follow the guidelines below.
Wire each chassis directly to the –48 V fused power source.
Do not daisy-chain two or more chassis. Do not wire chassis directly to other equipment or to a common bus bar. Most feeders from the -48 V to frames are limited to about 20 A, whereas load distributions support several hundred amperes. Direct wiring to the fused power source eliminates the coupling mechanism, which appears as impedance in the power distribution system. If impedance is not controlled, transient voltages will cause temporary or permanent malfunctions.
Connect your chassis to a true earth ground.
Connect the chassis to true earth ground to maintain signaling integrity and to prevent electrical shock. Do not allow the signal ground to float, and never connect a -48 V return to a ground.
Review the grounding specifications in the following Telcordia document: Isolated Ground Planes Definition and Application To Telephone Central Offices, TR-NWT-000295.