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

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.
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