MDS 05-4846A01, Rev. H
SD Series Technical Manual
9
Invisible place holder
Figure 4. Protected Network Station
With two transceivers and two power supplies installed, the unit con-
tinues to communicate even if a failure occurs in one of the transceivers,
or its associated power supply. This capability is important in critical
applications where uninterrupted service is required. Refer to publica-
tion 05-4161A01 for detailed information on this product.
Dual Protected Configurations
Two dual transceiver configurations are offered for the SD Series. They
are known as the
SDxDT
and the
SDxDP
. These configurations are used
for the following purposes:
• When full duplex operation is desired using dedicated Transmit
and Receive transceivers.
• When a Master or Repeater site requires bandpass duplexers due
to the presence of co-located antennas.
• When streaming Repeater operation is desired using dedicated
Transmit and Receive transceivers
To improve performance in networks that require the use of the modem
speed being faster than the baud rate, increase the
Data Key Hold Time-out
parameter which prevents frequent key-up key-down sequences
between character times. This parameter can be adjusted between 1 and
10 characters. See
Data Key Hold Time-out
on Page 54 for a complete
description.
SDxDT
Configuration
The SDxDT uses a similar chassis as the SDxP described above. How-
ever, one radio is configured with the transmit frequency and the other
for the receive frequency, with appropriate connections between them.
It also includes a bandpass duplexer tuned to a specific frequency for
simultaneous transmission and reception (full duplex) operation. Note
that the SDxDT provides one serial port and one Ethernet port for user
equipment.
