- #1
Option B: Ensuring Ground Communications in Buildings
- Thread starter Liad
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- Communications Ground
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SUMMARY
Option B, which involves using the building ground for communication, is not recommended for achieving a clear signal. The discussion highlights that traditional POTS (Plain Old Telephone Service) in the US operates on -48V, and substituting the second conductor with building ground can lead to significant signal degradation. Additionally, using building ground increases vulnerability to electrical transients, such as surges from lightning strikes, potentially damaging the phones. Therefore, for reliable communication, maintaining the integrity of the twisted pair connection is essential.
PREREQUISITES- Understanding of POTS (Plain Old Telephone Service) standards
- Knowledge of electrical grounding principles
- Familiarity with telephone line voltage specifications
- Awareness of electrical transients and their effects on communication systems
- Research the specifications and operation of POTS systems
- Learn about electrical grounding techniques and best practices
- Investigate the impact of electrical transients on telecommunication equipment
- Explore alternatives to traditional phone lines for building communications
This discussion is beneficial for telecommunications engineers, electrical engineers, and building managers involved in designing or maintaining communication systems within buildings.
- #2
berkeman
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Not sure I understand your question. What kind of phones, and what is the 24V? In the US, the POTS (plain old telephone sets) use -48V for power. And if you are asking if you can use a building ground instead of the 2nd conductor in the twisted pair of phone line, the answer in general would be "not if you want a clear signal". Also, building ground is susceptible to electrical transients (like surges caused by nearby lightning strikes), so the chance of damaging the phones would increase if wired that way.
- #3
Liad
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As for damaging the phones - they wouldn be connected for a long time and I don't really care about them. 
A for noise - as long the line will work and I'll be able to understand what the person in the other end says - I'm ok with it.
The phones are just plain phones, and 24v is enough to get the line open with no noises.
A for noise - as long the line will work and I'll be able to understand what the person in the other end says - I'm ok with it.
The phones are just plain phones, and 24v is enough to get the line open with no noises.
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