Bosch Appliances LTC, 8500 Camera and Monitor Video Connections, Termination Practices

7.5Camera and Monitor Video Connections

Refer to Figure 10 on page 28 for the next series of steps.

Connect the system cameras to the appropriate video inputs, but as a minimum con- nect one known operating camera to video input #1 on the rear of the main CPU bay. Use only those inputs that correspond to an installed VIM. Also connect desired monitors to the rear of the main CPU bay, ensuring to connect at least one monitor to video output #1. The video outputs are the left-most column of BNC connectors on the rear of the bay. Use only those outputs that correspond to an installed VOM.

7.6Termination Practices

Video from every video input signal must be “terminated” with a 75 ohm resistance. Each video line should be terminated exactly once. If video from a given camera is going to several different devices, only the last piece of equipment on the video line should be terminated. The following sections detail the ways that various Allegiant systems terminate video inputs.

LTC 8500 Series Video Terminations

Each LTC 8521/00 VIM card has an 8-position DIP switch for selecting the termina- tion of each individual video line. To terminate an input line, make sure that the appropriate DIP switch on the VIM card is ON. If non-terminated operation is required for looping purposes, turn the switch OFF (Switch 1 corresponds to the first video input channel of the card).

The LTC 8500 Series main bays do not directly support video input looping connec- tions. To attach video signals to inputs that will be looped on this system, a short piece of coax connected to a BNC "T" connector that has three (3) female ends is required.

Monitor Output Video Connections

Identical to camera inputs, monitor outputs on the Allegiant system are designed to be terminated. Each monitor output expects to be connected to a 75 ohm load. This is the regular load typically provided by a normal monitor. If a monitor output line is "looped" through several monitors or other equipment, the system installer should make sure that only the last unit on the line is terminated.

EN 18 Bosch Security Systems December 13, 2005