How to install the phone in the elevator, the telephone line is the effective distance?
The longer the phone line, the worse the effect
Can be accessed from the elevator control cabinet through the cable to the car and then access the car, the telephone line of the effective distance of 5 km. Elevator telephone, generally refers to the elevator when the failure, for emergency calls for help. Based on the need for emergency assistance, requiring the elevator telephone with multi-call, automatic dialing and other characteristics, taking into account the elevator car in the complex environment, requiring the phone itself must also have anti-sabotage, anti-percussion, anti-jamming and so on.
Of course, you can get from the elevator to the car and then go through the cable to the car roof and then access the car. Now the elevator has a walkie-talkie do not need to use the phone!
