AT&T 851 Manual

BELL SYSTEM PRACTICES
AT& TCo Standard
I.
GENERAL
This section contains identification, ordering,
1 .0 1
installation, connections, and maintenance
information for the 851- and 2851-type telephone
sets.
This section is reissued to:
1 .02
• Add 851CM and 2851CM (modular) telephone
sets
• Show 851BM and 2851BM telephone sets
MD
• Add Fig. 5, 6, 28, and 29
• Add Table E
•
Show 3-type speakerphone MD.
2. IDENTIFICATION
•The 851BM(MD) or CM (rotary dial) and
2.01
2851BM(MD) or CM (TOUCH-TONE® dial)
are modular telephone sets with a G15A handset
and H4DU handset cord
The 851CM (rotary dial) and 2851CM
2.02
(TOUCH-TONE dial) sets are available
completely assembled.
also available.
Purpose:
2.03
key station (5-line pickup and hold) at wall
installations.
2.04 Application:
PBX line circuits in 1A, 1A1, 1A2, or 6A
key telephone systems. Both the 851- and 2851-type
sets are wired for 1Al, 1A2, and 6A systems. For
1A KTS, internal wiring changes must be made.
BSP 503·601·10 ·i07 ...J 9 78·03·0l.jpg Scanned 6y Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Oct
TELEPHONE SETS-851- AND 2851-TYPE
.•
Their basic modules are
Provides features of a 6-button
Used with central office or
Not for use or disclosure outside the
Bell System except under written agreement
Fig. 1 -851 -Type Telephone Set
2.05 Ordering Guide:
(a) Telephone Sets:
• Set, Telephone, 851CM-* (Fig. 1)
• Set, Telephone, 2851CM-* (Fig. 2)
(b) Modular Items:
• Housing, 851A-*
• Faceplate, 852A-*
NOTICE
Printed in U.S.A.
OS,
2012 16:�8:09
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SECTION 503-60 1- 0
Issue 7, March 1 978
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