Bell 801A PBX User manual

BELL SYSTEM PRACTiCES
AT&TCo Standard
1. GENERAL
ATTENDANT AND STATION EQUIPMENT
METHOD OF OPERATION
SOlA PBX
SECTION .553-201-300
Issue 2, April 1974
1.01 This section describes the methods of operating
the attendant position and station equipment
associated with the 801A PBX. The attendant
position equipment will consist of 24- (short housing,
non-DSS), 34-
(short housing, DSS) and 54- (long
housing, DSS) type telephone consoles equipped
with rotary or TOUCH-TONE® dials. The station
equipment may be any single line or multiline desk
or wall-mounted telephone set.
1.02 This section is reissued to include information
on
the stutter dial tone, electronic dial
repeating tie trunk, and attendant control of station
dial access to
trunk groups features, and to make
minor changes to typical call sequences.
1.03 Amaximum of two attendant positions may
be provided in the PBX. All trunks (with
the exception of attendant trunks and some special
service circuits) may be' multipled between the
consoles giving each attendant full access to the
system. Direct Station Selection (DSS) may be
provided to a maximum of 90 lines when the
34-type console is used, or to a maximum of 180
lines when the 54-type console only
is used; however,
DSS
may be extended to the full 270-line capacity
ofa4-cabinet
system when a 1A1 selector console
is
used as an adjunct of the 54-type console.
1.04 When the PBX is arranged for multiple
console operation (two attendant positions
provided) an attendant position select circuit is
required which controls multiple
attendant operation.
Since
attendant trunks are not multipled between
the two attendant consoles, the position select circuit
steers "dial 0" attendant trunk calls. If both
attendants are idle, the request for an attendant
trunk will be steered to one console on a random
basis.
If an attendant is busy (any trunk pickup
key operated) and
the other attendant is idle, the
request for an attendant trunk will be steered to
the idle attendant. If both attendants are busy
with any type trunk call, subsequent requests for
attendant trunks will be steered on a random basis.
If selective attendant dialing is provided, and the
station user ·dials the assigned access code of a
specific
attendant, the request will be steered to
the requested console whether idle or busy (see
Tables D and P).
1.05 When multiple console operation is provided
and a pickup key (or DSS key) is
operated
on one console, the corresponding key lamp on
the other console is arranged to light steadily.
The HOLD condition is the only. exception. The
HOLD flash
rate appears only at the console from
which
the hold operation was initiated. If aposition
busy (POS BSY) key is operated, all hold flash
rates appear at both consoles.
1.06 .When the attendant control of station dial
access to
trunk groups feature is provided
(24B-, 34B-, or 54B-type consoles
furnished), the
attendant may operate up to threeTGR- (trunk
group restriction) keys to cause all outgoing (station
dialed) calls to any trunk in the trunk groups
strapped to the key(s) to be routed to the attendant
on an attendant intercept basis. The attendant
may then complete the outgoing call on either an
attendant-dialed or
through dial basis. When the
key(s) is released, stations may access trunk groups
in
the normal manner. All trunk groups, including
the main, may be strapped for this feature .•
1.07 The tables in this section show lamp signals
present at both consoles. Console A is
assumed to be the controlling console while lamp
©American Telephone and Telegraph Company, 1974
Printed in U.S.A. Page 1

SECTION 553-201-300
signals for Console B are considered supplementary
information.
For systems with only one console,
disregard Console B information. Either console
can be considered Console A
at the beginning of a
callsequence.
1.08 Manuals covering consoleequipment operation
and attendant instructions for use with the
80lA PBX are available to the customer. The
manuals are 999-200-136 Attendant Operating
Instructions- 24-Type Console-801A PBX and
999-200-137 Attendant Operating Instructions-34-54
Type
Console- 801A DSS PBX.
1.09 Lettered Steps: Aletter a, b, c, added to
a
step number in Part 2 of this section,
indicates an action which mayor may not be
required depending on local conditions. The condition
under which a lettered step
ora series of lettered
steps should be made is given in the ACTION
column, and all steps governed by the same condition
are designated by the same letter within a table.
Where a conditiondoes not apply, all steps designated
by
that letter should be omitted.
1.10 Symbols are used in the tables to represent
console key operations
(attendant action)
and console lamp indications. The symbols used,
in this section are as follows:
(
(
CONSOLE KEY CONSOLE LAMP
Symbol
Operation Symbol Indication
0 Operate
0
Steadily lighted
MO Momentarily
e
Dark (Not Lighted)
Operate
®
Winking - 30 ipm
HO
Hold
®
Flashing - 60 ipm
Operated
@
Flashing Wink - 60 ipm
~
Winking - 120 ipm
®
Flashing ~ 120 ipm
(
1.11 tThis issue of the section is based on the
following drawings: SD-1E304-01, Iss 3 Line Circuit (
DRAWING
TITLE
SD-IE305-01, Iss 7 Register Circuit
SD-1E306-01, Iss 4
One-Way Outgoing Central
Office Trunk
SD-IE300-01, Iss 3 Systems Application
SD-IE301-01,
Iss 5 SwitchingNetwork and Network
Control
SD-IE302-01, Iss 11Common Control
SD-IE303-01, Iss 3 Auxiliary Line Circuit
Page 2
SD-1E307-01, Iss 5- One-Way Incoming or Two-way
\.Outgoing Central Office Trunk
SD-1E308-01, Iss 3 Attendant Trunk
SD-1E309-01, Iss 4 Attendant Position
SD-IE310-01, Iss 4 Busy Tone Trunk
(

SD-IE311-01, Iss 3Intercommunicating Trunk
SD-IE312,;.Ol, Iss 5 Fuse, Alarm, Emergency
Transfer, and Test
,SD-IE313-01, Iss 3Attendant Controlled Conference
SD-IE314-01,
Iss 3Attendant Direct Station Selection
SD-IE315-01,
Iss 3 Camp-on
SD-IE316-01,
Iss 5Station Dial Transfer
SD-IE317-01, Iss 3 Dial Conference
SD-IE318-01,
Iss 3Ringdown Tie Trunk
SD-IE319-01, Iss 4Two-way Auxiliary Trunk
SD-IE320-01, Iss 3 One-way Outgoing Auxiliary
Trunk
SD-IE322-01, Iss 3 Attendant Console
SD-IE323-01,
Iss 9Position Select
SD-IE324-01,
Iss 4Ringing and Tone Supply
SD-IE330-01,
Iss 15System Interconnection
SD-IE290-01,
Iss 2 Emergency Transfer Circuit
tSD-IE321-01, Iss 1 Dial Repeating Tie Trunks
If this issue is to be used with equipment or
apparatus reflecting later issue(s) of the drawing(s),
reference should be made to
the SDs and CDs to
determine the extent of the changes and the
manner in which the section may be affected.
2. METHOD OF OPERATION
2.01
When overall operations of the PBX are
performed, PBX stations, trunks, auxiliary
equipment, etc, are employed' to establish the
necessary conditions. To select a particular circuit,
it
may be necessary to make other circuits in the
group busy to force selection of the desired circuit.
2.02 Care should be exercised in removing
equipment from service during periods of
heavy
traffic to prevent adverse service restrictions.
ISS 2, SECTION 553-201-300
2.03 Where the direct station selection (DSS)
service
feature is provided, when a station
line circuit is seized its associated DSS lamp will
light steadily.
2.04 tThe 24A-, 34A-, and 54A-type consoles
used~ with this PBX are equipped with
locking trunk pickup (TRK) keys, a locking position
release (POS RLS) key, and anon locking hold
(HOLD) key. Also provided are three push-to-operate,
push-to-release keys designated position
busy (POS
BSY),
night (NITE), and audible signal (AUD SIG)
and four nonlocking keys designated
transfer (TRFR),
release destination (REL DEST), page (PAGE),
and
start (START). Two lamps, designated major
alarm (MAJOR ALM) and minor alarm (MINOR
ALM)
are provided to alert the attendant of alarm
conditions within the system. tIn addition, the
24B-, 34B-, and 54B-type consoles provide three
push-to-operate, push-to-release and two nonlocking
keys which
are undesignated. These keys may be
used to provide
the attendant control of dial access
to
trunk groups feature (the push-to-operate,
push-to-release keys) or to provide access to
supplementary paging'equipment (nonlocking keys).
These keys will be connected and designated at
time of installation.s
2.05 The first operation of a push-to-operate,
push-to-release key establishes the condition
controlled by the key. The second operation of
the key will release the condition. For example,
the first operation of the NITE key transfers the
system to night service operation. "I'o release the
night service condition, the NITE key is operated
asecond time.
2.06 When the attendant transfers a call to the
attendant conference circuit (Table K) or to
acentral office
trunk using straightforward outward
completion (Table D), the keys must be operated
in the order specified in the tables for successful
completion.
If another operation is t~ be performed
between
the time the attendant answers an incoming
attendant trunk call and the time the call is
completed to
the central office trunk or attendant
conference circuit the attendant trunk should be
placed on hold and its identity remembered. The
attendant trunk may be placed on hold by operating
either the hold key, the position release key, or
another
trunk key. When the call is to be completed,
the
attendant reoperates the held attendant trunk
key and uses the sequences indicated in Table D
or K to complete
the call.
Page 3

SECTION 553-201-300
2.07
Index of Tables tor Typical Calls:
TABLE
TITLE
PAGE (
I
OUTGOING CENTRAL
TABLE
TITLE
PAGE
OFFICE TRUNK CALL
32
STATION TO STATION CALL
J
DIAL REPEA TING
(
AS
TIE TR UNK CALL
34 .
B
INCOMING CENTRAL OFFICE
K CONFERENCE CALLING
TRUNK CALL
6
(STATION CONTROLLED)
38
C
CALL TRANSFER - INDI-
L
A~ TTENDANT CONFERENCE
46
VIDUAL WITH PRIV ArrE
lVI
ElVIERGENCY TRANSFER
52
CONSULTATION AND
ADD-ON CONFERENCE
13 N
NIGHT SERVICE
54
(
D
INCOMING ATTENDANT
0
DIRECT ST A TION
TRUNK CALL (SINGLE OR
SELECTION CALL
59
MULTIPLE CONSc0LES)
19 P
PAGING
60
E
MULTI-CONSOLE OPERATION
Q
CODE CALL
63
(POSITION BUSY FUNCTION)
21 R
PBX INTERFACE
FA
TTENDANT TO STATION
TRUNI{ CALL
6S
CALL
23
S
RECORDED TELEPHONE
GINCOIVIING
RINGDOWN
DICTATION CALL
67
TIE TRUNK CALL
2S
ATTENDANT CONTROL OF!
tT
I
H OUTGOING RINGDOWN
STATION DIAL ACCESSTO TRuNK
~
TIE TRUNK CALL
31
GROUPS. 68
('
Page 4

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TABLE A
STATION TO STATION CALL
(See 2.03)
CONDITION
RESULTS
S
T
EACTION .
REMARKS
P
Call to Idle Station
1
At PBX station
Remove handset from switch hook
Dial tone heard
Dial tone silenced
2
Dial code of an assigned station
Audible ringing tone heard
At called station-
.Ringer heard
Ringer silenced
3
At called station -
At calling station -
Answer incoming call
Audible ringing tone silenced
Conversation satisfactory between calling and
called parties
4
At PBX stations
Disconnect from call
Call to PBX Station - All Intercommunicating Trunks Busy
5
At PBX station
Remove handset from switchhook
Dial tone heard
6
Dial code of an assigned station
Dial tone silenced
"-
Busy tone heard
7
Disconnect from call
CoII to Busy Station
8
At PBX station
Remove handset from switchhook
Dial tone heard
9 Dial code of busy PBX station
Dial tone silenced
Busy tone heard
10 Disconnect from call
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TABLE B
INCOMING CENTRAL OFFICE TRUNK CALL
(See 1.05, 1.06, and 2.03)
CONDITION
RESULTS
CONSOLE A CONSOLE B
5
TKEY
LAMPS
LAMPS
EACTION
REMARKS
pDESIG OPR CO RD CO RD
TRK TRK
TRK TRK
Incoming Signal
1 Idle condition
e e ee
2
Incoming signal from CO ®e
At console (s)
®e
Audible signal' heard
3 Atnd A answers
CO 00eAudible signalsilenced 0e
TRK
Conversation satisfactory
Answering Attendant Holds Call
4 Atnd holds call
HOLD MO
~
e
Conversation inhibited
0e
5
Atnd reenters held call
CO
00e
Conversation satisfactory
0e
TRK
Call Extended to Idle Station
6
Atnd dial tone connection START
MO 0e
Dial tone heard by atnd
0e
D-ial tone silenced
7
Atnd dials code of idle station
®e
Audible ringing tone heard by atnd
0e
At called PBX station -
Ringer sounds
8
Atnd releases before called party answers
POS
0®e
Audible ringing tone heard by CO party
®e
RLS
9
Atnd reenters before called party answers
CO
0®e
Audible ringing tone heard by atnd and
0e
TRK
calling party
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TABLE B (Cont)
INCOMING CENTRAL OFFICE TRUNK CALL
CONDITION RESULTS
CONSOLE A CONSOLE B
S
TACTION
KEY LAMPS
REMARKS
LAMPS
E
PDESIG OPR CO RD CO RD
TRK TRK
TRK
TRK
Ringer silenced
10 At called PBX station -0e At atnd console -0e
Remove handset from switchhook Audible ringing tone silenced
3-way conversation satisfactory
11 Atnd and calling party release
POS
0e e
Console idle
ee
RLS
Audible ringing tone heard by atnd
12 Repeat Steps 1, 2, 3, 6, and 7
CV
e
At called PBX station -0e
Ringer heard
<;
Ringer silenced
13 At called PBX station -
At atnd console-
0e
Audible ringing tone silenced
0e
Remove handset from switchhook
Conversation satisfactory between atnd
and called party -calling party excluded
14
Atnd releases
POS
00e
Conversation satisfactory between calling
0e
RLS
and called parties
15 Atnd reenters
CO 00e3-
Way conversation satisfactory
0e
. TRK
16 Atnd releases
POS
00e
Conversation satisfactory between calling
0e
RLS
and called parties
Attendant Recall
Conversation momentarily inhibited
17 At PBX station-
If call transfer individual-feature
(V
eis
not provided -
(V
e
Flash switchhook
Audible ringing tone heard, and atnd
Console (s) audible signal heard
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TABLE B (Cont)
INCOMING CENTRAL OFFICE TRUNK CALL
CONDITION
RESULTS
CONSOLE A CONSOLE B
S
TACTION
KEY
LAMPS
REMARKS
LAMPS
E
pDESIG OPR CO RD CO RD
TRK TRK
TRK TRK
18a
If call transfer-individual feature
is provided -
Audible ringing tone heard
At PBX station -
CD
e
At atnd consoles -
CD
e
Dial tone heard
• (See Note).
Audible signal heard
Dial 0
19
Atnd A answers
CO 00eAudible signal silenced 0e
TRK
3-W ay conversation. sa tisfactory
Conversation satisfactory between
atnd and calling party
20
Answering atnd releases called party
REL
MO 0e
At PBX station-
0e
DEST
Dial tone heard
Call may be extended to another PBX
station or tie trunk
21 At PBX station -0e0e
Disconnect from call
22b
If no 'other tests are to be performed -
POS
0e e
Atnd console and CO trunk restored to
ee
Atnd and calling party release
RLS
idle condition
Attendant Dials Code of Busy Station (If Camp-On Not Provided), Busy Tie Trunk, 0, First CO Trunk Group Access Code,
Restricted Code, Unassigned Code, or All Links Busy Condition
23
Atnd dial tone connection
START MO 0e
Dial tone heard by atnd
0e
Busy station,
CD
Dial tone silenced
busy tie trunk,
0
Busy tone heard
0 0
24
Atnd dials code
or all links busy
0, or first CO trunk
0e
Dial tone silenced
0e
group access code
Busy tone heard
25
Allow busy tone tobe returned for
0e
Busy tone momentarily silenced as 0e
.10 seconds register resets
-
~Note: If stutter dial tone feature is provided (AC76B circuit pack in register circuits) dial tone will
consist ofthree short bursts of dial tone followed by continuous dial tone.a
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TABLE B (Cont)
INCOMING CENTRAL OFFICE TRUNK CALL
CONDITION
RESULTS
CONSOLE A CONSOLE B
S
TACTION KEY LAMPS
REMARKS
LAMPS
E
PDESIG OPR CO RD CO RD
TRK TRK TRK TRK
Attendant Releases With Trunk Connected to a Register
26 Atnd releases
POS
0@eCO
trunk on hold
@e
RLS
Busy tone silenced
27 Atnd reenters held trunk
CO 00e
Conversation between atnd and calling
0e
TRK
party satisfactory
28 Atnd and calling party release
POS
0e e
Atnd console and CO trunk restored to
e e
RLS
idle condition
Call Extended to Station With Camp-On
29
At one PBX station -e e
Two DSS lamps steadily lighted
e e
Complete a station to station call
30 Repeat Steps 1 through 30e0e
31
Atnd dial tone connection
START
MO 0e
Dial tone heard by atnd
0e
If first station not in hunting group ---
32
Atnd dials code of first busy station
CD
e
Atnd, first, and second station hear
0e
audible camp-on tone
33
Atnd releases
POS
0
CD
e
CD
e
RLS
34
Repeat Steps 1 through 30eCO
trunk in Steps 34 through 39 is second 0e
incoming' trunk
35
Atnd dial tone connection START MO 0e
Dial tone heard by atnd
0e
36
Atnd attempts to camp-on second incoming
Dial tone silenced
trunk cal lon first station -
CD
e0e
Dials code of first busy station
Busy tone heard by atnd
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TABLE B (Cont)
INCOMING CENTRAL OFFICE TRUNK CAll
CONDITION
.I
RESULTS
CONSOLE A CONSOLE B
S
TACTION KEY
~t..MPS
REMARKS LAMPS
E
pDESIG OPR CO RD CO RD
TRK TRK TRK TRK
37 Atnd releases from busy tone
REL
MO 0
fa
Conversation between atrid and calling
0e
DEST
party satisfactory
--------'-
---
r---
38
Atnd dial tone connection
START
MO 0e Dial tone heard by atnd
0e
_._------
--
Dial tone silenced
39
Atnd calls second busy station -
C!)
e
If second station not in hunting group -0e
Dials code
Atnd, second, and first station hear
audible camp-on tone
40 Atnd releases
POS
C!)
e
C!)
e
RLS
_ w
41 At first and second PBX stations -
Ringers heard
Disconnect from call
42
At first and second PBX stations -
Ringers silenced
0e
Conversation between CO and station
0e
Answer incoming call
parties satisfactory
43
At PBX stations and CO parties-
ee ee
Disconnect from calls
Note: When all camp-on stores are busy, the attendant will receive- busy tone when dialing a busy station which is not in
a hunting group.
Call Extended to Ringdown Tie Trunk
44
Repeat Steps 1 through 30e0e
1"---.
--
I---
45 A
tnd dial tone connection START
MO 0e
Dial tone heard by atnd
0e
Atnddials code of ring down tie trunk
0~
Dial tone silenced
0
~
46
2-second audible ringing tone heard
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