Bell System AC Series Reference

BEU SYSTEM PRACTIQS
AT & TCo Standard
SECTION 502-303-101
Issue
I,
September 1911
REFERENCE
AC- AND AD-TYPE TELEPHONE BASES WITH
220-, 226-, 2220-, AND 2226-TYPE HAND TELEPHONE SETS
IDENTIFICATION, INSTALLATION, CONNECTIONS, AND MAINTENANCE
1. GENERAL
1.01
This section contains information for the ACt
(MD), AC1P, AC2 (MD), AC2P, AC2PH, ADl
(MD), AD2, AD3, and ADSH telephone bases and as-
sociated 220A (MD), 220C, 220AL, 220AM, 226A,
2220B (MD), 2220C, 2220BM, 2220BMG, and 2226A
hand telephone sets. For additional information on
hand telephone sets, refer to Section 502-303-102.
All ACl and ADl telephone bases
manufactured prior to 10-1-72 and
any base which is opened for any
reason should be rewired as shown
in Table A before proceeding with
coD.IJectiolJB shown in other tables.
1.02
The reasons for reissuing this section are
listed below. Revision arrows are used to em-
phasize the more significant changes.
• Delete D6AP mounting cord from Fig. 35
• Revise paragraph 2.11 and Table K.
2. IDENTIFICATION
2.01
The 220- and 2220-series hand telephone sets
(Fig. 1 and 2) contains the dial and speech net-
work. The AC- and AD-type telephone bases contain
the ringer, line switch, terminal board, and jacks for
the handset and mounting cord. A complete
TRIMLINE~
telephone set includes the hand tele-
phone set, telephone base, and cords. Refer to Table
K for identification of associated apparatus.
2.02
The 2220BMG hand telephone set has an
840364269 polarity guard assembly installed
at the factory.
2.03
The 226A and 2226A handsets (Fig. 3) contains
a 315B amplifier which provides up to 20 dB of
NOTICE
FLOATING
FINGER STOP
Fig. 1-220-Type Hand Telephone Set
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A.
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