SECTION
MITL9105/911
O-096-350-NA
Note:
If
wait for Dial tone is programmed on the trunk group, the
[
console will use a receiver, if available; otherwise no receiver
‘.
is assigned.
5.12 The console indicators are refreshed and/or updated continu-
ously every 100 ms by the CPU. These indicators include the
7-segment display for the time-of-day clock, the source and destina-
tion readouts and the calls-waiting display as well as over 200
LEDs.
The status of each of these indicators is maintained in the volatile
RAM on the IPC card. Every 100 ms, the processor addresses the RAM
on the Console Control card and sends it information for each of the
two consoles. This data is then sent along a pair of wires to the
console. In the console, the information is stored in a RAM. At this
point, the console’s CPU takes control and sorts this input “file” into
the form required to turn the
LEDs
and the console ringer on/off.
Hook-Flash
5.13 A hook-flash is defined for the system as an on-hook condition,
of between 200 ms and 1500 ms (700, 900 or 1100 ms may be
used as a System Option). A flash may occur in an off-hook condition
where a speech path has been established between an extension and a
trunk or between two extensions. When an extension flashes the
switchhook, the Scanner informs the CPU. The CPU checks its memory
to determine whether a flash is legal. If not, the extension is discon-
nected from the speech path. The flash is interpreted as the beginning
of a new call. However, when a flash is determined to be a legal
operation, the CPU starts a timer. If the extension goes back off-hook
within the specified time period, it is considered to be flashing. An
on-hook of less than 200 ms is considered to be a noise glitch, while
an on-hook greater than 1500 ms (700, 900 or 1100 ms alternatively) is
considered as a call termination (hang-up).
5.14 When a flash is detected; the processor disconnects the flash-
ing extension from its speech path, finds a free speech path
which it tests, and connects the extension to it. It then provides
transfer dial tone (from the Tone Control card) and connects a receiver
to the speech path, allowing the extension to dial and converse pri-
vately with a third party. If the extension had flashed out of a con-
ference, the conference is unaffected. However, if the other party was
not in conference, it is disconnected from its speech path and con-
nected instead to HOLD.
Incoming Calls
(GS/LS
Trunks)
5.15 When the trunk circuit detects ringing voltage, forward or re-
verse current, or a tip ground (ground start trunks), the trunk’s
microprocessor informs the CPU. The LED on the Trunk card will light
and the CPU reads a status report from the trunk. The CPU finds and
tests a speech path and notifies the
programmed.equipment.
The CPU
then connects it, and the trunk to the speech path, and sends a
command to the Trunk card. The Trunk card then terminates the trunk
circuit and enables the audio. If the trunk has been programmed for
DISA, the system processor waits 10 seconds before answering and
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