system-installation practice section
81293-2
©Tellabs, Inc., 1
June
1982
all rights reserved, printed
in
USA
Plos
293
One-Way
Alerting
System
Installation
'irtellabs
technical manual
76-81293-2
rev A
h.
-
s5n
"m·
.
figure
1.
293
One-Way
Alerting
System
ing, and features connectorized shelves. When
the
293 System
is
located near
the
switching equip-
ment, connectorized cables permit quick intercon·
nection between
the
293
System and
the
switching-
equipment
cross-connect frame.
Station
and
switching-equipment connections to
the
293
Sys-
tem
are made via Universal Service Order Code
(USOC) RJ71C connectors. This arrangement
allows bridging plugs
to
take
the
place
of
the
293
System connectors, allowing normal
telephone
ser-
vice both before
the
System
is
installed
and
after
the
293
System
is
taken
out
of
service.
installation
and
power
1.06
The
standard 293-System Mounting Assem-
bly
is
aprewired Tellabs
Type
10
Mounting Shelf
with aconnectorized backplate.
Thisconnectorized
configuration allows quick interconnection
to
the
cross-connect frame
and
associated peripheral equip·
ment. The Mounting Assembly
or
Assemblies
mount
in
astandard 19-inch
or
23-inch relay rack
or
in
acabinet, either
of
which
is
optionally avail-
able with
the
System.
The
System
is
powered from
-48Vdc
filtered, ground-referenced
power
supply
or
battery. This voltage source can be provided
via
astandard telephone-type power supply
or
by
shar-
ing
the
PBX's
battery,
as desired.
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19
page
11
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contents
section 1general information
section 2installation
section 3system wiring diagram
section 4module block diagrams
section 5system specifications
section 6testing
and
troubleshooting
1. general
information
1.01
The
Tellabs
293
One-Way Alerting System
(figure
1)
is
amultistation ringdown
telephone
cir-
cuit
used
in
emergency-alerting applications. With
the
293
System, large numbers
of
people can be
simuItaneously alerted via their telephones when
emergencies such as fires, industrial accidents,
or
threatening
weather
conditions
occur. Thus,
the
293
System can serve small communities, hotels,
motels,
apartment
buildings, condominiums, high-
rise buildings, hospitals,
department
stores, shop-
ping malls, schools,
campus
facilities, factories,
chemical and nuclear facilities, and numerous
other
applications where personnel require immediate
notification
of
emergency
and/or
evacuation pro-
cedures when disaster
threatens
or
strikes.
1.02
In
the
event
that
this Practice section
is
re-
issued,
the
reason
for
reissue will be stated
in
this
paragraph.
system configuration
1.03
The
293
System
is
modular
in
design and
configured
in
100-station increments. Each fully
autonomous
1DO-station
increment
is
subdivided
into 10-station increments, 10 stations being
the
number
accommodated
by each line-circuit module
in
a
293
Mounting Assembly. Aminimum-size 293
System consists
of
one
293 Mounting Assembly
equipped with 2common-control modules and 1
to
10
line circuit modules, aringing generator, and
apower supply. Optional
backup
batteries, a
message-announcement device, awall-mounted
activation panel,
and
a
cabinet
that
houses
all
of
the
above
equipment
(except
the
activation panel)
can be provided
if
required. 2. installation
system application site preparation
1.04
The
293
System can be used with any con- 2.01
As
defined
in
Part
68
of
the
FCC rules,
ventional PBX switching system; maximum length registered terminal
equipment
can
be
directly con-
of
each station loop
is
1000
ohms. Generally,
the
nected
to
the
telephone
network
through
standard
293
System
is
used
in
either
of
two
on-premises
connectors
referred
to
as Universal Service Order
applications. Specifically,
the
System can be
in-
Code (USOC) connectors. It
is
the
customer's
re-
stalled
in
series with
station
telephones served by asponsibility
to
inform
the
telephone
company
of
PBX, such as
in
ahotel
or
office building,
or
the
the
quantities
and
types
of USOC
connectors
that
System can be installed
in
series with
CO
lines, are required.
In
addition,
the
sequence
of
PBX ex-
such as
in
an
apartment
complex.
tension numbers for each USOC
connector
must
293-to-PBX
interconnection
be identified by cable pair
and
pin numbers. The
1.05
The
293
System
is
easy
to
install because it 293 System
is
connectorized and wired
in
accor-
is
compact
in
size, does
not
require extensive wir- dance with USOC RJ71C.
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