6.
"Programmable Ringing".
Switches
P1
to
P4
provide a choice of five ringing programmes. With all the switches
P1
to
P4
"open" an incoming call is presented to extension
1
for six periods of ringing.
If the call is unanswered it is then presented to extension 2 for four periods of ringing,
then to extension
3
for four ringing periods. If still unanswered the call is then presented to
extensions
4, 5,
and 6 in turn, each for two periods of ringing. This cycle is then repeated
until the call is answered or abandoned. Table
1
shows the alternative ringing programmes.
NUMBER OF RINGING PERIODS
P Switch
Operated
6
4
4
2
2
2
None
Extn 1
Extn 2
Extn 3
Extn 4
Extn 5
Extn 6
4
Extn 1
Extn 3
Extn 5
--
--
--
3
Extn 2
Extn 1
Extn 3
Extn 4
Extn 5
Extn 6
2
Extn 2
--
--
--
--
--
1
Extn 1
--
--
--
--
--
TABLE 1
-
Programmable ringing sequence
"Call Barring"
Switches A, B and C2 to C6 are used with the "Call Barring" facility. There is a choice of
four options of barring with two groups of barring within each option. Once an option has been
selected, it will apply to all extensions in the system, but there will be the choice of two groups
within that optior:i for each extension.
Table 2
shows the call barring options, note that
Extension
1
cannot be barred.
Switch ID selects the appropriate International Dialling code. With switch ID open code
00
is selected, with switch ID closed code
010
is selected. ISD barring bars dialled ISD calls,
it does not bar International Operator access.
(SEE PAGE
7
-
FOR
TABLE 2)
