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Linksys Voice System Administration Guide
207
Setup
Impedance
The impedance of the lines that are connected to SPA400’s telephony
ports
Default:
600 Ohms
Tip/Ring voltage
The tip-to-ring voltage reserved for voice transmission
Default:
3.5 Volts
Operational loop current
Min
The minimum loop current that maintains an off-hook state. If the loop
current drops below this value, the phone enters on hook state.
Default:
10 mA
On-Hook speed
The time that the loop current drops to 0mA when the phone enters
the on-hook state.
Default:
Less than 0.5ms
Ring frequency Min
The minimum frequency of a valid ring
Default:
10
Ring frequency Max
The maximum frequency of a valid ring
Default:
100
Ring Validation Time
The minimum duration of a valid ring
Default:
256ms
Ring Indication Delay
The delay in reporting the ring after it presents on the PSTN line
Default:
512ms
Ring Timeout
The delay on reporting that the ring stopped after it no longer presents
on the PSTN line
Default:
640ms
Ring Threshold
The minimum voltage(rms value) of a valid ring
Default:
13.5-16.5vrms
Ringer Impedance
Default:
High
DC current Limiting
Default:
Enable
Caller Id & CP Tone Method
The regional settings for Caller ID and call progress tones
Default:
North American
Battery reversal as
discconnect signal
Can be chosen as a method for signalling the end of a call
Default: unselected
Loop period shut-down as
disconnect signal
Can be chosen as a method for signalling the end of a call
Default: selected
Minimum period for
disconnect signal
The minimum duration that the loop current is cut off to signal the end
of the call; used with the loop period shut-down method
Default:
750