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Pre-Installation Considerations

Installation Location Requirements

The CSP must be installed in a restricted area, such as a dedicated equipment room or data closet.

Environmental Requirements

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.

Space Requirements

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.

Rack-Mounting Options

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.

Redundant Power Option

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, Dialogic 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.

Wiring

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.

Grounding

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 to a ground.

For More Information

Review the grounding specifications in the following Telcordia document: Isolated Ground Planes Definition and Application To Telephone Central Offices, TR-NWT-000295.

Electromagnetic Interference

Electromagnetic Interference (EMI) is a type of radiation that can hinder your system. Keep the following in mind when selecting cables:

Shielded cable prevents outside electrical interference and drains off current induced by lightning.

Twisted wire reduces induction, and thus interference, from one wire to the other. Varying the length of twists reduces the potential for signal interference between pairs.

Twisted pair wiring is available in various thicknesses. Thicker cable covers longer distances and provides better sound quality but it is more expensive.

Channel Service Units

A Channel Service Unit (CSU) connects a digital phone line (T1, E1, J1) from the phone company to a digital communications device. CSUs are required between line cards and the network to provide necessary linking capabilities such as:

Line conditioning for long haul transmissions

Remote loopback

Equalization

Regeneration and monitoring of digital signals

Digital circuit testing

Protection from outside lines

Surge Protection

Dialogic recommends installing a surge protector between your call processing system and the power outlet. If a high voltage surge occurs on the power line, this device protects your system by sending the overload to ground.

Electrostatic Discharge Protection

Electrostatic Discharge Protection (EDP) must always be used. Electrostatic Discharge (ESD) protective straps, shoes, or mats must be used when working with CSP components.

Electrostatic discharge from your body can damage integrated circuits.

Digital communications link - voice, data, and video at a 1.544 Mbps rate (24 64 Kbps channels)
A digital communications link - voice, data, and video at a 2.048 Mbps rate; 30B/2D or 31B/1D (ISDN); non-North American version of T1.