TC4400 Call-Control Console
Drawings
Table of Contents (cont’d)
System Block Diagram
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TC4400
Wiring Diagram
Console Work Sheet
Console: Main Schematic
TC4 120 Interface Module schematic
Console Keyboard schematic
CPU schematic
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Description
This Console allows the simple and efficient handling
of multiple inside and outside calls as well as the perfor-
mance of the other Telecenter functions normally han-
dled by any administrative or display phone. The
following communication resources are included on the
1. Direct Select (DS) keys
These
twenty keys each select a line to answer, place,
or transfer a call. Each has a red and a green LED
state lamp) that show the status of the
corresponding
line:
Red LED:
This relates to Console action:
(a)
a one-sec-
ond flash rate signals a call;
a faster, half-second, flash
rate signals a call on hold; and (c) a steady glow indicates
that the Console is communicating with that line.
Green
This
relates to non-Console Telecenter
activity:
(a) flashing
indicates that the line is being called;
and
a steady glow indicates that the line is busy (calling
or in communication with the Console or another line).
Only dialing phones activate the green
The DS keys can be dedicated to one of three functions.
They will be divided into three groups as follows:
Trunk Lines (outside calls): The
group (starting
at the top left) may have up to ten keys, the recommended
system limit for
(“Attendant Answer Interconnect”
lines-outside calls directed to the Console).
B. Telecenter Keys
(inside calls): These keys serve two
purposes: (1) receiving inside call-ins
rooms with
speakers and switches or non-dialing phones, plus “Op-
erator”
calls from dialing phones, and (2) making
inside calls and performing other Telecenter functions.
C.
Monitored Extensions: These-
keys correspond to
specific Telecenter lines. Although they will typically be
administrative phones, both non-dialing phones and
speaker-and-switch lines can be monitored. The
on
the key show whether a dialing phone is busy or is calling
the Console (“Operator” calls from such a line will come
in on its corresponding key, not a Telecenter Key). The
key can be used to answer a call from the line, to call the
line, or to
a call to the line.
2.
A
Alpha-numeric Display
The last four positions contain special prompting
characters on what to do next:
is the Console’s version of dial tone. This means that
you never have to wait for dial tone, but can begin
dialing a number (or pressing a DS key) immedi-
ately.
means that the number you dialed is busy.
means that you should press the
Transfer, Hold,
or
Release
key next.
R/number]
means you must press either
Release
or the
DS key with that number. The keys are numbered
l-20, from left to right; for example, is the left-most
key in the first row, and is the left-most key in the
second row.
k/number] means you must press the DS key with that
number. This prompt may occur if you attempt to
transfer a trunk to a nonexistent extension. The
system then wants you to go back to the original
trunk before attempting another transfer.
The
16 characters
of the display operate like the
display on a standard Administrative Display Phone.
ins from rooms with switches or non-dialing phones ap-
pear here. These call-ins are listed by their dialing
numbers in the order of their priority. Up to three call-ins
can be listed; as the Console
and clears one call,
any additional call-in that is in the queue will come onto
the display.
Characters 13-16 (those
just to the left of the four
prompt positions) show the last number called by the
Console (or any other administrative phone that shares
the same display driver). A colon separates this number
from the list of waiting call-ins.
3.
A
Standard Dial Pad
Use this for dialing numbers or entering other
ter functions, just as on a standard tone-dialing phone.
Although all other dialing phones in the Telecenter re-
quire dial tone before they can begin dialing, the Console
has its own direct path to the system and never has to wait.
When dialing to telephone-company lines, however,
actual tones must be sent out. These tones are supplied
by the system rather than the Console, so the tones will
lag behind your pressing of the keys. Even if no tones are
heard for a moment, finish dialing: the system will “catch
up” as soon as a system dialing unit becomes available.
