The Remote I/O communication is based on single point grounding, that is located at the head. Coaxial cable and taps have no additional connection to the ground to help eliminate low frequency ground loops.
A cable system must be grounded at all times to ensure proper operation of the nodes on the network. The cable system is grounded by the RIO head processor. But if the cable is removed, the ground connection doesn’t work anymore.
Ground blocks provide grounding, even if the cable is removed.
Additional properties are as follows:
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Low insertion loss
Only if five or more are used, they have to be considered in the trunk attenuation with 0.2 dB each. The impedance is 75 Ω and the return loss >40 dB.
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Wide application frequency
The ground block 60-0545-000 consists of two female in-line F connectors and a separate screw hole binding for attaching a ground wire. The grounding block has two mounting holes, allowing it to be mounted to a flat surface.
1
Female in-line F connector
2
Grounding block
3
Locking screw (for ground wire)
4
Mounting screw
NOTE: Local building codes may require the cable shield tied to ground, whenever the cable system exits and/or enters a new building (NEC Article 820-33).
Surge protection is available for coaxial network trunks that span between buildings and are exposed to lightning. The recommended product has internal gas discharge surge protectors that absorb very high currents induced into the cable system by near-lightning strikes. The device indicated has insertion loss of less than 0.3 dB at the network operating frequency. The unused drop ports must be terminated with a 52-0402-000 Port Terminator. If desired, shrink tubing may be used to seal the F connections.
The device should be accessible for maintenance, and be protected from the elements if installed outside. The threaded stud should be connected to building ground.
The recommended product is Relcom Inc. p/n CBT-22300G. Contact information is:
Relcom Inc.
2221 Yew Street Forest Grove, Oregon 97116, USA
Tel: (800) 382-3765
www.relcominc.com
