Copyright © 2000 Tunstall Group Ltd.
Lifeline 4000 Advanced User Guide (B)
61
High resolution periodic calls
Lifeline 4000 also allows high-resolution periodic calls using parameter 166, although only if
periodic calls are enabled in parameter 12. If high-resolution calls are enabled then this overrides
any other settings made in parameter 12. High-resolution periodic calls can take place just hours
or minutes apart. They are of particular use in domestic violence and witness protection cases,
where you wish to ensure that the unit has not been unplugged or the telephone line cut.
d
e
l
b
a
n
E
o
r
e
Z
s
y
a
w
l
A
s
r
u
o
H
s
e
t
u
n
i
M
1
0
0
3
0
0
The first digit in the table above is set to 1 for enabled and 0 for disabled. The latter four digits set
the time between calls in hours and minutes, with a maximum of 23 hours 59 minutes and a
minimum of 1 minute. In reality, it would be unwise to set a time between calls to be as small as
just one minute.
Example
To enable periodic calls every 3 hours
1.
Enter local programming mode by holding down the
key and then holding down the
# key until the unit beeps. Release the # key first, and then the
key.
2.
Enter the parameter—press
1 6 6
.
3.
Delete the old value using the C key (display version only).
4.
Enter 1 0 0 3 0 0 and then press
.
5.
End local programming by pressing the
Cancel
key.
Adding a random time element to a periodic call
If many Lifeline 4000s are programmed to call into a control centre with a periodic call at the same
time this can lead to congestion at the control centre, and this is more likely to be a problem with
high-resolution periodic calls, where many calls are being made. To address this problem, it is
possible to add a random time element to a periodic call, up to a maximum of four hours. This call
randomization only applies to high-resolution calls.
If the time entered into parameter 167, in hours and minutes, equals 00:00 then there will be
no random element added. If the time is 3 hours 30 minutes (see the example below) then a
random time element will be added to when the call is made, up to a maximum of 3 hours 30
minutes. Consequently, the time entered into parameter 167 is the maximum variance allowed in
the random time element added to a periodic call.
Example
To set the maximum random time added to a high-resolution periodic call to 3 hours 30 minutes
1.
Enter local programming mode by holding down the
key and then holding down the
# key until the unit beeps. Release the # key first, and then the
key.
2.
Enter the parameter—press
1 6 7
.
3.
Delete the old value using the C key (display version only).
4.
Enter 0 3 3 0 and then press
.
5.
End local programming by pressing the
Cancel
key.
Summary of Contents for Lifeline 4000
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