Mitel SX-200 Documentation page 26

SECTION MITL91 OW91 lo-096-100-NA
Page 20
4.08 In addition to the buttons and LEDs described above, the con-
sole has a 12-digit key pad which is used for dialing all calls, an
emergency transfer switch (mounted on the back of the console)
which switches the PABX into failure transfer mode, and a volume
control (mounted on the back of the console) to vary the bell volume.
4.09 All console buttons are nonlocking.
Audible incoming Discrimination
4.10 The console incorporates audible signal discrimination. Under
some conditions requiring attendant service, distinctive audio
codes are issued by the tone ringer. With this facility, visually impaired
attendants can operate the console and be aware of the various
calling-in situations that can arise. These situations are as follows:
Incoming calls; i.e., LDN calls, Dial 0 calls or Recalls
HOLD connection time-outs
l
A "flash-for-attendant"
l
Controlled Conference
A MINOR alarm flashing.
For use by a visually impaired attendant, all events requiring
4.11
attendant recognition are placed in a queue and give an audible
signal on a first-in, first-out basis. In the case of the first situation
DIAL 0 or RECALL), the same audible signal is given indicating
that the call can be answered with the ANSWER button. To find the
actual button the visually impaired operator can poll the keyboard. The
remaining events have distinctive audible signals and may be readily
associated with the relevant button. For further information, see Sec-
tion MlTL9105/91 lo-096-315-NA
Keyboard Polling
4.12 For proper operation of the console, a visually impaired atten-
dant must be aware of the status of the keyboard. For example,
he/she must know whether the BELL OFF or NIGHT 1 button has been
enabled. To do this the attendant presses the LAMP TEST button in the
silent mode (the ringer is off, the 7-segment indicators are on and the
evant buttons are pressed in turn. If the LED associated with a button
is lit, the ringer will sound as long as the button is pressed down. If
the LED is flashing, the ringer will give a 0.5 second on, 0.5 second off
audible signal. In this manner the status of the BELL OFF, NIGHT 1 or
any button (including an incoming call) can be determined and appro-
priate action taken. When this operation takes place, the LAMP TEST
button is the last to be released, otherwise the current button being
polled will become active when the LAMP TEST is released first.
occurring during an Attendant-