Tellabs 293 Installation Manual

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
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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 a prewired Tellabs Type 10 Mounting Shelf
with a connectorized backplate. Thisconnectorized
configuration allows quick interconnection to the
cross-connect frame and associated peripheral equip·
ment. The Mounting Assembly or Assemblies
mount in a standard 19-inch or 23-inch relay rack
or in a cabinet, 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
a standard telephone-type power supply or by shar-
ing the PBX's battery, as desired.
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contents
section
1
general information
section 2
installation
section 3 system wiring diagram
section 4 module block diagrams
section 5 system specifications
section 6 testing and troubleshooting
1. general information
1.01 The Tellabs 293 One-Way Alerting System
(figure 1) is a multistation ringdown telephone cir-
cuit used in emergency-alerting applications. With
the 293 System, large numbers of people can be
simu Itaneously 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. A minimum-size 293
System consists of one 293 Mounting Assembly
equipped with 2 common-control modules and 1
to 10 line circuit modules, a ringing generator, and
a power supply. Optional backup batteries, a
message-announcement device, a wall-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 switch ing 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 a sponsibility to inform the telephone company of
PBX, such as in a hotel 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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