telecommunications

This is my first thread. Thanks is advance for your experience. We are installing a telephone entry system with remote programming capability among other systems. The issue, however, is an AC voltage oscillation on the telephone line. The voltage fluctuates from 19v to 240v on the telco main...

Good evening, I took my local 701 exam last November, scored a 8 out of 9 and now I have my interview on Friday the 13th :devil:. I'm not sweating the interview since I've read through all those posts however I have a basic question which I should of asked a while back: What's exactly is in...