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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
A maximum 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
of a 4-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 a position
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
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