AT&T 2833 Series Identification, Installation, Connections, And Maintenance

BELL SYSTEM PRACTICES
AT & TCo Standard
SECTION 503-702-110
Issue 5, December 1980
TELEPHONE SETS
833- AND 2833-TYPE
IDENTIFICATION, INSTALLATION, CONNECTIONS, AND MAINTENANCE
1. GENERAL
1.01
This section contains information for the
833- and 2833-type telephone sets. The 833-
(rotary dial) and 2833- (TOUCH-TONE® dial) type
key telephone sets are special plug-ended 20-button
key telephone sets, initially designed for use with
the 14A (MD) Communication System, (COM KEY*
1434). These sets also may be used with 21A
Communication System (COM KEY 2152). For
information on COM KEY Systems, refer to the
appropriate section in Division 518.
1 .02
This section is reissued to:
• Add information on automatic and manual
DO-NOT-DISTURB feature
• Add D-180990 Kit of Parts for 4-wire service
• Add D-180883 Kit of Parts for electromagnetic
interference (EMI)
• Show 14A Communication System MD
• Add lead designation for 21A Communication
System, Fig. 6 through 13.
2. IDENTIFICATION
2 .01
The 833BM, 2833BM, 833CM, and 2833CM
(Fig. 1) are modular type telephone sets
and will replace the 833B, 2833B, 833C, and 2833C
telephone sets, respectively, which are hereby rated
MD. The 833DM, 2833DM, 833EM, and 2833EM
are also modular sets and are electrically and
functionally equivalent to the 833BM, 2833BM,
833CM, and 2833CM sets, respectively, except that
they have been adapted for wall mounting. The
modular sets will all be equipped with a G15A-50
*Trademark of AT&T Company
handset and H4DU-50 handset cord which will plug
into a 616T jack mounted on the left front of the
telephone set base (Fig. 2). Current production
models of these sets also are equipped with an
improved line switch and an automatic button
restoral (ABR) feature. Some early production BM
and CM sets were not so equipped.
Fig . 1- 2833CM Telephone Set
2 .0 2
The 833B (MD), or 833BM, 833DM and 2833B
(MD), or 2833BM, 2833DM telephone sets are
equipped with a 647K5 key in the lower key position
consisting of a hold button, six line buttons, and
three intercom buttons. A 647P5C key is located
in the upper key position consisting of a RECALL
button, a Privacy Release (PRIV RLS) button, and
eight line buttons. The privacy circuit board is
factory installed and wired (Fig. 2).
2.03
The 833C (MD) or 833CM, 833EM and 2833C
(MD) or 2833CM, 2833EM telephone sets are
NOTICE
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A.
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