Reference10:Interfaces/FXS/Advanced: Difference between revisions

Revision as of 15:11, 4 September 2013

The advanced settings of the analogue interfaces can be made here:

Optimization grade:	As per default the TEL ports are optimized for low power consumption (Optimization 'high' and 'mid'). This decreases the usual on-hook supply voltage of 48V down to 24V. Most conventional phones and faxes can deal with this. In case a special phone is connected that cannot deal with this low voltage this dropdown can be modified. 'high' and 'mid' both set 24V on-hook voltage. The off-hook loop current is set to 20mA. 'low' sets 48V on-hook-voltage.
Ringing Voltage	This topic modifies the ringing voltage used for ringing. Ringing frequency is 25Hz. 'low' sets 65Vpk/45Vrms, 'mid' sets 68Vpk/48Vrms and 'high' sets 70Vpk/49,5Vrms AC.
Loop length	Loop length can be set to 'low' for 500ft/155m or 'high' for 5000ft/1550m.

Note: there is no difference between PoE and PSU powering of the IP2x.

For possible line lengths, see Maximum wire length.

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	Note: there is no difference between PoE and PSU powering of the IP2x.		Note: there is no difference between PoE and PSU powering of the IP2x.

			For possible line lengths, see [[Howto:Maximum_wire_length\|Maximum wire length]].