Distribution Equipment
The distribution equipment represents the most significant part of the VDV system. The distribution equipment is connected to the Headend directly, via one (1) of four (4) ports.
The distribution equipment is responsible for the following:
- Signal transmission and reception via the Leaky Feeder cable.
- Amplification of signals in the cable to maintain signal strength.
- Supply of Pilot Tones to control Automatic Gain Control circuits.
- Splitting of network to achieve coverage in stopes and levels.
- Maintaining correct system impedances.
- Surface coverage via antennae where required.
The distribution system includes the following components:
- Leaky Feeder Cable
- Line Amplifier Units
- Splitters/Branch Units
- Pilot Tone Generators
- Line Termination Units
- Diagnostics Modules
The number of individual components required in a final VDV system varies from mine to mine. This occurs due to the large number of variables such as channel capacity, length of coverage required and number of branches.
The VDV system is totally modular, additional channels can be added as the mine develops, similarly, additional distribution equipment can be installed to ensure that the mine is always covered with signal.