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(
I
(
)
BELL SYSTEM PRACTICES
AT
&
TCo Standard
~lON
518-450-106
Issue
!,
December 1977
4A COMMUNICATION SYSTEM
(COM KEY* 416)
USING 981/2981- AND . . . /2913-NPE TEti:PHONE SETS
CONTENTS
1. GENERAL
2.
IDENTIFICA liON
BASIC FEATURES
OPTIONAL FEATURES
TELEPHONE SETS
PBX INTERFACE
ORDERING GUIDE
A.
Basic Apparatus
B.
Optional Apparatus
c.
•••- t
l.lillitr''lfPi''fili~.
· ·
3.
INSTALLATION AND CONNECTION
PlANNING
•·
POWER REQUIREMENT$,
CABLING RESTRICTIONS
SYS1'EM
CABLING AND CONNECTIONS
TELEPHONE SETS
Primary Sets
Basic Sgtellite and HFAI Desk Sets
BIS Desk Sets
Basic Satellite Wail Sets
*Trademark
2
4
4
CONTENTS
~~·_WaD
S.ts
AN HFAI Sets
PAGE
23
• . . ·
~-
25
25
. BASIC.
FE4.,~
26
8
10
10
11
11
12
fl
17
17
18
18
"'
19
19
19'
20
20
Printed in U.S.A.
CO/PBX and Intercom
'if.lt
AssigniJI~J$
(Primary Sets Only)
.
.
• .
.
.
26
CO/Rl.X Rll\fiWft and DSS Code
Assignments ,(All Sets)
26
OPti&NAL FEA lURES
27
....
Supplementary Power Using
l~
Power Unit
27
Music-on-Hold
28
,..-on-Hold
;.,.1'2
Paging Using 1 09A Loudspeaker
~a
Paging Using 27 A Apparatus
Ultlt
and Customer Paging SysteJJ'I
vfi!UJA}
Power
""\ut:•
Ringing {24A '"' 2 . .
Apparatus Unit)
• .
.
.
: .
•
-'
~.....-:.:-. ~
,"" /',
Supplementary Alerting Device Access
31
31
.
.
35
37
(25A Apparatus Unit)
38
:::. "
·.t·d\-~
Preset Multiple Voice
Sitlnali~
.. · (26A
Apparatus
Ufljt)
'·
r•
•.
i;t~K~
38
Station' Dial Restridion
~l.uifJ
u!.'
40
41
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