Cisco Systems SPA9000 manual Line Settings, Default Less than 0.5ms

SPA400 Field Reference

Setup

C

Line Settings

Transmit Gain	The gain level that the SPA400 may use to increase or
	attenuate the power level before transmitting to the
	telephony port
	NOTE Change this setting if remote call participants have
	trouble hearing the users of the SPA9000 Voice System. Make
	changes in increments of 3 dB; changes of less than 3 dB will
	not have a perceptible impact.
	Default: 0
Receive Gain	The gain level that the SPA400 may use to increase or
	attenuate the power level before receiving on the telephony
	port
	NOTE The default Receive Gain settings should be
	satisfactory in most use cases. Unnecessary changes in
	Receive Gain can cause problems with echo.
	Default: 0
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	The minimum loop current that maintains an off-hook state. If
current Min	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

SPA9000 Voice System Administration Guide 266