User's Manual

4 MDS 1710A/C and MDS 2710A/C/D MDS 05-3447A01, Rev. F
Point-to-Point System
Where permitted, the transceiver may also be used in a point-to-point
arrangement. A point-to-point system consists of just two radios—one
serving as a master and the other as a remote—as shown in Figure 3. It
provides a simplex or half-duplex communications link for the transfer
of data between two locations.
Figure 3. Typical Point-to-Point Link
Continuously Keyed vs. Switched Carrier Operation
The keying behavior of the master station can be used to describe an
MAS system.
Continuously Keyed operation means the master station transmitter is
always transmitting a carrier, even when there is no data to send. The
master station is always simultaneously transmitting and continuously
listening. Different frequencies must be used for transmit and receive.
Switched Carrier operation is a half-duplex mode of operation where
the master station transmitter is keyed to send data and unkeyed to
receive.
Single Frequency (Simplex) Operation
Single frequency operation (also known as simplex) is a special case of
switched carrier operation. Single frequency operation is automatically
selected whenever the transmit and receive frequencies are set to the
same value. Note that data turn-around times are increased when a
single frequency configuration is used.
1.4 Product Configurator Codes
The full radio model number is printed on the radio enclosure. It pro-
vides key information about how the radio was configured when it was
originally shipped from the factory. See
Figure 4 for an explanation of
the configurator codes.
REMOTE
MASTER
HOST
COMPUTER
RTU