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Bell System Practices 851 Identification, Installation, Connections, And Maintenance

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BEU SYSTEM PRACTICES
AT &
TCo
Standard
SECTION
503-601-1
01
Issue
8, February 1980
851- AND 2851-TYPE TELEPHONE SETS
IDENTIFICATION, INSTALLATION, CONNECTIONS, AND MAINTENANCE
1.
GENERAL
1.01
This section contains information on the 851-
and 2851-type telephone sets.
1.02
This section is reissued to:
Add additional ordering information
Update dial wiring diagram information,
Fig. 27 and 29
• Add cable routing in current 851CM and
2851CM telephone sets, Fig. 30 and 31.
2.
IDENTIFICATION
2.01
The 851BM (MD) or 851CM (rotary dial)
and 2851BM (MD) or 2851CM
(TOUCH-TONE"'
dial) are modular telephone sets with a G15A
handset and H4DU handset cord.
2.02
The 851CM (rotary dial) and 2851CM
(TOUCH-TONE dial) codes are available as
a completely assembled telephone set or a basic
modular telephone set
base.
2.03
Purpose:
Provides features of a 6-button
key station (5-line pickup and hold) at wall
installations.
2.04
Application:
Used with central office or
PBX line circuits in lA, 1A1, 1A2, or 6A
key telephone
systems.
Both the 851- and 2851-type
sets are wired for 1A1,
1A2,
and 6A systems.
For
1A KTS, internal wiring changes must be made.
2.05
Ordering Guide:
(a)
Telephone Sets (Complete):
Set, Telephone, 851CM-* (Fig. 1)
Set, Telephone, 2851CM-*
(Fig.
2)
NOTICE
Fig. 1-851-Type
Telephone
Set
(b)
•Telephone
Set
Bases:
Base, Telephone Set, 851CM
Base, Telephone
Set, 2851CM•
(c)
Modular Items:
Faceplate, 852A-*
Faceplate, 2852A-*
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A.
Page 1

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2851