Specifications

Page 12–2
FOCUS System Manual
telephones must both be connected to the same
channel.
You can initiate a call at either end by lifting the
telephone handset. This causes the distant end to
start ringing. When the person at the distant end
lifts the handset from the cradle, the ringing stops,
and the communications channel is established.
To terminate the call, the person at each end places
the handset back in the cradle.
Figure 12–2. Remote Telephone Extension.
12.2.2 Remote Extension
The FOCUS remote extension feature lets you
relocate a standard telephone set to a remote
location. This application requires a two-wire
voice terminating (V2T) module at the termi-
nating, or “PBX,” end of the circuit, and a
two-wire voice originating (V2W) module at the
originating, or remote, end, as shown in Figure
12-2. You connect a PBX extension line to the
terminating end of the circuit and a standard
telephone set to the originating end. The signal is
transmitted over a single FOCUS DS0 channel.
The two modules making up a circuit must be
mapped to the same channel, or time slot.
Likewise, both the PBX extension line and the
telephone must be connected to the same channel.
The remote telephone operates as if it were
connected directly to the local PBX. You initiate a
call from the remote end by lifting the handset
from the cradle, listening for the dial tone, and
dialing the telephone number (remember that you
must use a touch-tone phone). When the call is
complete, replace the handset in the cradle to
terminate the call. Likewise, you can call the
remote extension from a normal telephone, just
like you would any other telephone number.
In addition to the voice capability, you can also
use this application to transmit data using a two-
wire modem.
12.3 Installation
As with other FOCUS modules, we recommend
that you initially install and test each set of
V2W/V2T modules and interfaces in a pair of
“test” chassis (i.e., chassis which are not part of
an operating network). This way, you can quickly
perform the acceptance test without interfering
with a live network. Whether you are installing the
modules in test chassis or chassis that are on line
in a network, use the installation procedure
described here.
The V2T/V2W module occupies one chassis slot.
The module’s two channels require two (2) time
slots on the DS0 line. Before installing the module
and its interface, make sure that:
• The FOCUS chassis is set up, energized,
and operational, with all necessary
common equipment (see Chapter 3)
• The FOCUS Configuration Software (FCS)
has been installed on your terminal (see
Chapter 3)
• Acceptance tests for the FOCUS chassis
and all previously installed equipment have
been done to rule out invalid test results for
this module
• FCS is up and running (see Chapter 3)
12.3.1 Hardware Installation and
Connections
To install the V2W/V2T module and interface,
complete the following steps.
(For complete instructions on specific FCS proce-
dures, please refer to the FCS online help facility.)
1. Bring the FOCUS chassis “on line”.
Click on the “Online” speed button
.
This uploads to the FCS the current status,
settings, operating statistics, etc., for the
FOCUS chassis — and the V2W/V2T
module.
Station PBX
FOCUS Link
V2T Channel
Module
(FXO)
(
V2W Channel
Module
V2W Channel
Module
(FXS)