The Exclusion/Privacy Device is for sharing lines between phones, modems, credit card machines, fax machines, etc.
Keep in mind that this device will let you share phone lines for both incoming and outgoing calls, but they have no way of routing incoming calls. That means that only one of the devices should be allowed to automatically answer the line!
We get lots of calls from people wanting Line In-Use indicators, so they know when the modem or phone is in-use, and they don't interrupt the call when making an outbound call. The Exclusion/Privacy Adapter will do it automatically.
We also get calls from people who want A/B Switches, to manually switch a line between two or more phones. The Exclusion/Privacy Adapter will do it automatically for outbound calls.
NOTE: These devices work on the Voltage Drop principal! A standard phone line has 48VDC (or so) of talk battery, which drops to 6 - 15VDC when a phone is taken off hook. The Privacy Devices are placed in front of each phone or modem and know that the line is busy (off-hook) if the voltage drops below a threshold of 24VDC. If the talk battery is below 24V, the device won't conduct electricity, so the phone won't be able to pick up the line. Because of that, you can't use the regular Privacy Devices on Key System or PBX stations that have 24V talk battery.
You can't use these on very long cable runs because the voltage doesn't drop much on the other run when you go off hook. If the voltage doesn't drop below the threshold of the Privacy Device, the Privacy Device won't exclude.
White/Blue in and White/Blue out.
Put one on the pair to each phone or device. Put it at the NI, the frame, on a 66 block, at the jack, or even inside the phone (not a good idea since you can lose track of it if you need to replace the phone).
One side of the Hardwire Privacy Device is punched down on the 66 block, and the station cable (or jumper wire) is 'beanied' to the other end. Includes beanies.