Siemens DataNET Hub (DNH) user manual Cable Impedance Settings, + Important

DataNET Copper Connections, Continued

Cable Impedance Settings

Behind each single port connector is an associated jumper pin block, see Figure 2-1. Each block is used to select the termination impedance of its associated port to match the cable’s own impedance characteristics. The three selections for each port are 100-ohm, 120-ohm and 150-ohm. Use the 150-ohm setting for the recommended cable. If the specific cable impedance is not known use the 100 ohm setting. Select the impedance setting that matches the cable impedance by placing the shorting jumper across the selected pins.

DataNET Hub Signal Equalizer Board

Using Other than Recommended Cable

Recommended Cable

Downlink Port

Connections

+ Important

The Hub Signal Equalizer board balances the attenuation of signals when varying lengths of copper cable connect multiple downlinks from a HUB. The board plugs into a port connector and is wired to its associated downlink port. See DataNET Hub Signal Equalizer Board, page 34 for determining the attenuator board settings.

If you are using a cable other then the recommended cable types, the cable signals for each channel must be measured at the DNH port con- nection. These signal measurements are used to determine the attenu- ator settings for a DataNET Hub Signal Equalizer Board; see page 34.

Refer to Site Wiring Requirements. Table 2-1 (page 19) to determine the requirements for your site.

All downlink connections are made to any of the eight-downlink ports. When a Signal Equalizer board is used the network wiring must connect to TB1 on the signal equalizer board.

Always ensure that the same port number is used for redundant channel connections i.e. Channel A to Port 1 on ‘A’ Hub and Channel B to Port 1 on ‘B’ hub.

2000585-001 Installation • 31