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DCN Wireless Installation and User Instructions System Design and Planning

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Limit 5: Cable lengths

Refer to section 2.7:

•With regenerative tap-offs, the maximum cable length is 250 m from the central control unit to the furthest device in any branch of the DCN.

•The maximum cable length from the central control unit to the first regenerative tap-off is 100 m.

•The maximum length of the cable between regenerative tap-offs is 100 m.

•Open-ended cables can cause an incorrect operation of the system.

Note

The total cable length includes the 2 m long device cables.

2.5Control capacity

2.5.1Active devices

Active devices are devices that can:

•Receive data from the central control unit.

•Transmit data to the central control unit.

Note

Active devices must have an address (refer to section 12.2).

2.5.2Passive devices

Passive devices can only receive data from the central control unit.

2.5.3Overview

The table shows the active and passive devices in the DCN.

table 2.1: Active and passive devices

DeviceType

DCN-DDBPassive/Active

DCN-DDIActive

DCN-FCSPassive

DCN-IDESKActive

2.6Power capacity

2.6.1Introduction

Each device uses power and most devices do not have an independent power supply.

2.6.2Power consumption

The table shows the power each device in the DCN uses.

table 2.2: Power consumption

DeviceWatt

DCN-DDB2.0

DCN-DDI4.5

DCN-FCS0.9

DCN-IDESK3.6

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