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Product Description

Many LAN installations require the protection of a large number of Ethernet lines that are being terminated at a switching center/server. These lines need surge protection due to the environment that they are subjected to. This environment may allow high voltage transients caused by lightning or other electrical disturbances, which induce voltages on Ethernet cables. These transients have the easy ability to destroy semiconductor junctions, and thus cause permanent equipment failure.

A lightning strike in the vicinity of data lines can cause induced ground currents which can also do serious damage. The Model 3311 Multi-Port Protection Card is designed to accommodate these transients, slow them down and redirect them to a low impedance path to earth ground. Protection of the 10Base-T lines is provided by using the 4-wire design which has proved to be very effective in other Telebyte protection products. It limits the voltage to approximately 7.5 Volts and passes signals whose data transfer rate can exceed 10 MBPS.

The protection circuits incorporate two separate stages. The DC series resistance is limited to approximately 5 Ohms and the response time is measured in nanoseconds. It is good practice to install a protection device on each end of the 4-wire transmission line.

The Model 3311 provides access to the 4-wire line using RJ-45 connectors. Each 3311 contains 15 10Base-T protection circuits. The Model 3311 is designed to be inserted into the Model 3310 Card Cage. The Model 3310 Card Cage will accept up to five 3311 cards for a total of 75 10Base-T protection circuits.

Each card contains input and output RJ-45 connectors for each 10Base-T connection. In addition, there are two grounding pins per card which fit into nickel plated ground bars on the card cage. The bars provide earth ground connections via ground attachment screws.

The Model 3310 Card Cage is hinged so that the installer and maintenance personnel have access to the rear. The Card Cage is locked in position using two captive thumbscrews. The individual cards are locked into position via a captive retaining rod.

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