The Transtector DXR Digital Exchange Rack Protector is ideal for applications that require protection for T1/E1, 10/1 OOBT, 1000BT, 48VDC and DS3 connections. The protection cards utilize silicon avalanche diode technology. The protection system consists of a versatile chassis that can mount to a wall surface or 2U 19″ rack frame, with protection cards that load and connect entirely from the front face. The chassis system is available in 12-card wide and 4-card wide configurations. The DS3 and T1/E1 protection cards are optimized for the specific applications and are marked with the type, input connection, output connection and troubleshooting monitor connection. The DS3 card features a direct bond between each BNC ring to the chassis ground for optimum signal integrity and best grounding practice. The DS3 module within the DXR utilizes two individual PCB’s to accomplish one interconnect point. By doing this, one complete DS3 circuit can be accomplished. Figure 1 illustrates the circuit schematic detailing the cable crossing that must be employed for DS3 equipment communications. The Ethernet cards provide the best protection and signal transmission integrity available on the market and are marked with the input and output connections. System status monitoring for the Ethernet circuits and protection cards are determined through the network polling functionality built into all standard Ethernet equipment. The DXR P/N 1101-875-1 is provided with a fully configured system of four each T1/E1 protection cards, two each 1000BT protection card. A 48VDC module is available in addition to the other modules. The 48VDC module provides 4 pairs of input lines and 4 pairs of output lines. Two RJ-45 connectors are used for the I/O’s and are located on the face plate. Unused card slots are covered with a blank plate.

The protection circuits offer bi-directional protection, with the optimum protection oriented towards the sensitive equipment connected to the a (output) side. All RJ-45 connected protection configurations offer straight through pin-outs from the input to output connectors. It is up to the user to swap between the Transmit and Receive wire pairs if required. The DXR chassis are intended to be mounted to almost any type of panel surface, as close as possible to the protected equipment and a dedicated set of ground studs are provided that must be bonded to the nearest master ground bar or equipment rack ground bar for proper surge protection functionality. In the unlikely event of surge protection self sacrifice, the individual protection cards will fail short to disrupt communication. The protection cards can be replaced for ease of service. The protection cards incorporate fusing elements to open the circuit for human safety in the event of power line crossing onto the data lines.