Hotline Telephone Over Fiber Optics

Hotline Telephone Setup
The hotline analog telephone is setup by using a pair of subscriber side modems at both ends over a fiber optics link.
The fiber optics link could be either be SM or MM with a possible distance of up to 20 - 30 km depending upon modem  specification.

How Does Hotline Telephone Works?
Simply just lift up the analog handset at one end , the analog phone located on the other end will automatically give a ring without the need to do any dialing.