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User Reference and Installation Guide 2-22
© 2006 Microwave Data Systems Inc.
All Rights Reserved.
MDS
Digital Radio Series
05-4561A01, Rev. A
Figure 2-11. Front Panel connections in 1 + 1 multi-hop repeater configuration
2.10 Data Interfaces
The I/O card has 2x100BaseTX interfaces that can be configured as either primary payload, or
secondary wayside channels. The Over-the-air channel has a data-bandwidth capacity that is set
by the frequency-bandwidth, modulation, and coding. The data-bandwidth may be allocated to
various I/O card interfaces, including STM-1, 2 Mbps per E1, up to 50 Mbps Ethernet, and up to 1
Mbps NMS. Only up to 100 Mbps of data-bandwidth may be allocated for Ethernet data, and the
two I/O card 100BaseTX interfaces will share that 100 Mbps data-bandwidth.
There is also an option mini-I/O card, which provides STM-1 Optical/OC-3 or STM-1 Electrical
interfaces. The optical interface is single mode at 1300 nm. Consult factory for availability of
Mini-IO STM-1/OC-3 Module.
2.11 Power Management
RF power management is a radio design feature that controls the power level (typically expressed
in dBm) of the RF signal received from a transmitter by a receiver. The traditional goal of power
management is to ensure that the RF signal at a receiver is strong enough to maintain the radio
link under changing weather and link conditions.
Traditional power management techniques such as Constant Transmit Power Control (CTPC)
and Automatic Transmit Power Control (ATPC) transmit at a high power level to overcome the
effects of fading and interference. However, these techniques continue to operate at a higher