User's Manual

MDS 05-4121A01, Rev. 02 TRM SB Integration Guide 9
NOTE:
The transceiver does not support full-duplex operation (i.e.,
transmitting and receiving at the same time). For information
on other products that provide this capability, contact your
sales representative.
Receive Only Operation
The transceiver is available as a receive-only module. The operation is
identical to the tranceiver model, except that the transmit functions are
disabled.
1.4 Applications
Point-to-Multipoint, Multiple Address Systems (MAS)
Point-to-multipoint (MAS) is the most common application of the
transceiver. It consists of a central master station and several associated
remote units as shown in Figure 2. An MAS network provides
communications between a central host computer and remote terminal
units (RTUs) or other data collection devices. The operation of the radio
system is “transparent” to the computer equipment. That is, the radio
system transports the data in its original form, making no changes to the
data format.
Often, the radio system is used to replace a network of remote monitors
currently linked to a central location by leased telephone lines. At the
central office of such a system, there is usually a large mainframe
computer and some means of switching between individual lines
coming from each remote monitor. In this type of system, there is a
modulator/demodulator (modem) at the main computer and at each
remote site, usually built into the remote monitor itself. Since the cost of
leasing a dedicated-pair telephone line is quite high, radio is frequently
used as an alternative communication medium.