Telephone Line Emulator User’s Manual
40-400-00020, Rev. M
23
On/Off-hook Detect Times
Off-hook Detect is the minimum duration that loop current must occur for a valid off-hook
condition. On-hook Detect is broken into two values. If a call has not been completed, for
example a busy number has been dialed, a short on-hook time is used. If a call has been
completed, a long on-hook time is used. This allows hook flashes to be recognized. If
hook flashes have been disabled, the TLE always uses the Call Not Completed timer
value for on-hook detection.
Off-hook Detect Times may be set from 100 to 3000 mS in 5 mS increments. On-hook
Detect may be set from 100 to 3000 mS in 5 mS increments.
Note: On-hook time must exceed Hook Flash time.
Hook Flash Detect
Hook Flash, a.k.a. FLASH and Switch Hook Flash, is a loss of loop current for a specific
duration that is used to request special features, such as Transfer, Conference, and Hold.
Hook Flash Detect Minimum and Maximum can be set from 75 mS to 1200 mS in 5 mS
increments.
Each line may be enabled or disabled for Hook Flash Detect.
Line Reversal
A line reversal is a signal that changes the polarity of the battery on the line subject to
certain conditions. These conditions may include Called Party Answer, Call Termination,
and others. Line Reversal Type is available as Disabled, Simple or Complex. (The
default is reversal disabled. This programming will apply to all lines.) When the unit is
programmed for Simple Line Reversal on an originating call, a line will perform a reversal
just prior to issuing dial tone. It will then remain at that state until it goes back on-hook, in
which case another reversal will be performed. For an incoming call a line will perform a
line reversal after it goes off-hook in response to ringing.
When the unit is programmed for Complex Line Reversal on an originating call, a line will
perform a momentary reversal just prior to issuing dial tone. The duration of the reversal
is programmable, and may range from 50 mS to 100 mS in 5 mS increments. On an
incoming and outgoing call a permanent line reversal will be performed at call completion.
Forced Disconnect
Forced Disconnect is a method used by the telephone company to clear a line. When the
called party goes on-hook, the Central Office returns an open (that is, drops loop current)
of at least 800 mS to the calling party. The TLE emulates Calling Party Control, in which,
if the calling party goes on-hook the called party receives a Forced Disconnect within 2
seconds. If the called party goes on-hook, the calling party receives a Forced Disconnect
which may occur some time greater than 2 seconds later. This timer is programmable, up
to 30 seconds. The actual Length of the Forced Disconnect is also programmable with
the default being 850 mS.
Forced Disconnect Length may be set from 0 to 2 seconds in 5 mS increments.
Forced Disconnect Delay may be set from 1.2 to 30 seconds in 5 mS increments.
This feature may be enabled or disabled for each line.
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