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Bell System Practices TOUCH-A-MATIC 2872A1M Identification, Installation, Connections, Operation, And Maintenance page 3

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ISS 5, SECTION503-603-101
1.04
The telephone
sets are available
in the
• Polarity
guard (removable
for dry circuit
following colors:
application)
• Black (-03)
• Common audible ringing
• Green (-51)
• Buzzer
• White (-58)
• Busy lamp diode
• Lt. Beige (-60).
• Line pickup buttons convertible to nonlocking
signal buttons
1.05
The 2872A1 (MD) faceplate is available in
satin-silver
(-87) color only.
• Memory
buttons
from
which
to select
preprogrammed
telephone
numbers
for
1.06
The 2872B1decorative faceplates are available
automatic
dialing
in the following colors:
• Capability to record and automatically
dial
• Teak Woodgrain (-108)
31 telephone
numbers
of up to 15 digits
each
• Walnut Woodgrain (-109)
• Last number manually dialed memory
• Matte Aluminum (-122).
• Plug-in battery
2.
IDENTIFICATION
• Capability
to pause for subsequent
dial
2.01
The 2872AIM or 2872A2M telephone
set
tones during automatic dialing (WAIT input)
provides all standard features of a 6-button
key telephone
set plus (manual)
TOUCH-TONE
• End-to-end signaling for data application.
dialing, automatic
dialing of 31 frequently
called
numbers, and a LAST NUMBER DIALED scratch
pad
memory.
B. OptionalFeatures
2.02
The 2872A2M telephone
set differs
from
the 2872AIM set only in the battery circuit.
2.04
Optional
Features
(Refer
to Table
A):
The 2872A2M set has a battery interlock
circuit
that prevents the set from dialing automatically
if
the battery is not plugged in.
Also, the 2872A2M
• Speakerphone--either
$3B (MD)¢ or 4A
telephone
set utilizes
a newly
coded battery
speakerphone
systems
may be added to
(KS-20390L4) which can not be used in the 2872AIM
stations
set.
• Dial Tone Detector--automatically
starts
dialer when precise TOUCH-TONE dial tone
(350 Hz and 440 Hz) is present.
A. DesignFeatures
• One-Touch Calling, (requires both dial tone
2.03
Design
Features:
detector and speakerphone)--depressing
one
memory button will automatically
turn on
• Modular key telephone set
speakerphone,
detect
dial tone, and dial
complete number.
• Integrated circuit RC TOUCH-TONE oscillator
Note:
All dial tones encountered
in the
• Integrated
circuit memory
process of placing a call must
be precise
TOUCH-TONE dial tone if the call is to be
• Surge protector
completed automatically.
Page 3

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