Difference between loop start line and ground start

1, loop-start signaling:
when loop-start signaling is used, A router's fxo interface looks like a phone to the switch (private branch exchange (PBX), Public Switched Telephone Network (PSTN), key-System) It connects. the fxo interface closes the loop to indicate off-hook. the switch always provides a battery so there is no disconnect supervision from the switch side. since a switch expects a phone user (example of an fxo Interface) to hang up the phone when the call is terminated (on either side ), it also expects the fxo port on the router to hang-up. this "human intervention" is not built into the router. the fxo port expects the switch to tell it when to hang-up (or remove the battery to indicate on-hook ). because of this, there is no guarantee that a near-end or far-end fxo port disconnects the call once either end of the call hangs-up.

2. Ground-start signaling, for example:
Ground-startSignaling can be used on the fxo port of the router if the switch is capable of providing a ground-start connection. when configured, the switch removes the ground from the connection and the fxo port goes on-hook.

Loop start line closes the circuit on the telephone
You can send a signal to remove the host. When a user disconnects the device, the current will flow out of the battery on the loop side through the closed hook key, and the current will be sucked together.
Circuit relay and power it. When the contact of the line relay is closed, the user wants to obtain the service. A line Finder"
The c o switch provides dial-up sound and connects the user to the c o switching device and the available circuit.
It is used to connect p B X to the ground start line of C O on the local loop, but it is only partially running. Loop side
Grounding causes the current to flow only half of the line relay. When p B x needs to be connected, the C O line finder sends a dial tone
And provides connections to the c o switching device. When dialing sound is detected, the grounding contact is opened and other parts of the line are established
Start work.

 

Loop-start-(default): loop start, which is used on a home phone or landing site.

Ground-start-use the ground and Current Detector for connecting the PBX and relay.