Diagnose installation, Cable length margin

Praesideo 3.5 Installation and User Instructions 9 System Configuration

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50 Diagnose installation

50.1Introduction

With the Installation page in the Diagnose section of the web interface (see figure 50.1), the system installation can be diagnosed.

figure 50.1: Installation page

50.2 Cable length margin

The cable length margin can be checked if the network controller has hardware version 20.00 or higher. As is indicated in section 31.5, the maximum cable length depends mainly on the number of nodes in the system. For a system loop a certain maximum data delay is permitted for proper operation. Most of the delay is the propagation delay of the cable, but each node introduces some additional delay that depends somewhat on the temperature of the unit. A higher unit temperature causes more delay and reduces the maximum cable length. The network controller measures the data delay and calculates the remaining time. This time margin is then converted to the Cable length margin, the length of cable that can be added to the system. Due to the temperature dependance this margin will change with temperature, dependent on the number of nodes in the system. Therefore an additional quality indication is given: Safe, Critical or Unstable.

Safe means no action required, there is sufficient margin. In a Critical situation the margin should be checked at the highest expected temperature to make sure that there is still a margin left. In an Unstable situation, the system size should be reduced by decreasing the number of nodes or the length of the cable.

When a redundant loop topology is used, the cable length should be checked with the shortest link between two nodes removed. This is the worst case situation.

50.3 Number of nodes

The number of connected addressable nodes can be checked if the network controller has hardware version

20.00or higher. See table 31.2 for the number of nodes per unit. The maximum number of nodes is 63.

50.4 Optical network

Proceed as follows to diagnose the optical network:

1Check the optical power margin of all network connections by reducing the optical level to Half

power.

2Check for fault events with reduced level. If no relevant faults are present, then resume normal operation by restarting the network controller. Otherwise, check for critical connections.

Note

Although it is possible to resume normal operation by selecting Full power, it is strongly recommended to restart the network controller. In case the power margin is nearly critical, the unit may not accept the Full power command anymore.

Bosch Security Systems 2011-02

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Bosch Appliances 3.5 Diagnose installation, Cable length margin, Number of nodes, Optical network

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