Specifications

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20
20.1 Description
The Addressable Two-Wire Voice Module adds an
“intelligent” orderwire capability to your FOCUS
system. It lets you use standard Dual Tone Multi-
Frequency (DTMF) telephones to selectively
(using user-assigned, three-digit extension
numbers) place calls between any two locations
(e.g., substations) within a FOCUS orderwire
network, as well as between the orderwire system
and your company’s Private Branch Exchange
(PBX). This lets you replace any leased phone
lines at these locations with fiber optic channels
provided by your FOCUS system. Both voice and
data communication are supported.
The module comes in two types: the PBW and the
PBT. The PBW is an originating module; it is the
one to which you connect your telephones. You
install a PBW module in each location where you
want an addressable telephone extension. It is
through the PBW modules that you initiate and
receive point-to-point communication between
stations within your FOCUS system. The PBT is a
terminating module; it is the one to which you
connect an extension line from your PBX. This
connects your orderwire system — and any
stations (PBW modules) on it — to your PBX.
Both the PBW and the PBT modules occupy one
physical slot on the FOCUS chassis and provide
one orderwire channel using one DS0 time slot.
Both module types are also “addressable.” You
can use the FOCUS Configuration Software
(FCS) to assign each module its own three-digit
address, or phone number.
The PBW and the PBT modules also use the same
type of interface: the PBW/PBT rear interface
module. The rear interface module provides both
an RJ-9 jack and a compression-type terminal
block (see Figure 20-3). This lets you connect
your telephone line or PBX extension line either
by plugging its RJ-9 connector into the RJ-9 jack
or connecting its two-wire line directly to the
terminal block. (Please see the “Installation”
section later in this chapter for complete installa-
tion and setup instructions.)
For a complete listing of the Addressable Two-
Wire Voice Module’s technical specifications,
please see Table 20-2 later in this chapter
20.2 Application
The Addressable Two-Wire Voice Module’s
addressability and built-in communication
functions make it ideal for two types of applica-
tion:
•Internal orderwire network connecting
stations within your FOCUS system to
each other
•Internal orderwire network connecting
stations within your FOCUS system to
each other and to your company PBX
You can install either type of network in any
FOCUS system configuration: rings, rings with
spurs, linear systems, etc.
20.2.1 Internal Network
Setting up an internal orderwire network within
FOCUS requires installing a PBW module and
telephone in each location at which you want an
addressable telephone extension. One PBW
module can support (i.e., ring) up to three tele-
phones. Figure 20-1 shows an example of an
internal orderwire network within a FOCUS ring
configuration.
With an internal orderwire network you can:
• Selectively place calls between any two
stations on the network
•Ring all stations on the network simultane-
ously from any one station
•Break in, or interrupt, an ongoing call
involving any of the stations on the
network for an emergency or for a confer-
ence call
20. Addressable Two-Wire Voice (PBW/PBT)