Specifications

Page 1–6
FOCUS System Manual
1.12.1 Ring Down
The ring down capability provides a point-to-
point communications circuit using a standard
telephone set at each end of the circuit. This capa-
bility is achieved by use of a standard telephone
set and the originating Two-Wire Module (V2W).
The V2W carries the signal over a single DS0 in a
FOCUS system. The call may be initiated from
either end by lifting the handset of the telephone,
causing the distant end to start ringing. When the
handset at the distant end is lifted, the ringing
terminates and the voice channel is established.
The call is terminated by each user returning the
handset to the cradle. Each V2W module contains
two channels and a common ring generator. One
channel may be disabled if not needed.
1.12.2 Remote Extension
The remote extension capability is a transparent
relocation of the telephone set to a remote
location. It is achieved by use of a standard
telephone set, a V2W at the remote end, and a
V2T at the PBX end. The signal is carried over a
single DS0 of a FOCUS system.
The telephone behaves exactly as if it were
connected directly to the local telephone system.
A call is initiated by lifting the handset at the
terminal with the V2W, waiting for the dial tone,
and then dialing the desired telephone number. An
incoming call will alert the user by ringing a
standard telephone. The ringing will stop when
the handset is lifted. The call is terminated by
returning the handset to the cradle.
The MV4 supports both DTMF and pulse
signaling. Each V2T module contains two
channels. One may be disabled if not needed.
1.12.3 Four-Wire Voice Data
Four-Wire Voice (modem and tone equipment)
can be supported by use of the Four-Wire Module
(V4W) at each end of the circuit which carries the
signal over a single DS0 of a FOCUS system.
Gain control to adjust the incoming and outgoing
signal levels is available through the software.
This permits matching of the signal strength to the
requirements of the user. The maximum data rate
that can be supported by modems using the 4-wire
interface is 9600 bps. E&M signaling is
supported. Each V4W module contains two
channels and uses two DS0 time slots. One may
be disabled if not required.
1.12.4 Two-Wire Modems
Analog data from Two-Wire modems can be
supported by use of the V2W at each end of the
circuit which carries the signal over a single DS0
of a FOCUS system. Gain control to adjust the
incoming and outgoing signal is available through
the configuration software. This permits matching
of the signal strength to the requirements of the
user. The maximum data rate that can be
supported by modems using the two-wire
interface is typically 4800 bps.
1.13 RS-232 Low Speed Data
Module
Available on the RS-232 Data Module (232) are a
pair of RS-232 data circuits which carry the signal
over two DS0 channels of the FOCUS system.
Each of the circuits can operate up to speeds of up
to 9600 bps asynch. (19,200 bps w/two stop bits).
Data and modem control signals, such as those in
Table 1-1, are transferred transparently across the
circuit. You do not have to preselect data rates.
Connections are made through standard RS-232C
hardware and interface directly with data terminal
equipment via a DB9 female connector, without
the necessity for modems or other intermediate
TX Transmit Data
RX Receive Data
RTS Request to Send
CTS Clear to Send
DSR Data Set Ready
DTR Data Terminal Ready
Table 1–1.
Data & Modem Control Signals