Baseband Processor Card; Baseband Processing - Radyne DMD20 Installation And Operation Manual

Theory of Operation
Form-C Contacts:
The UIM provides three Form-C Relays under processor control that appear at J11.
Mod Fault:
Demod Fault:
Common Fault:
Open Collector Faults:
The UIM provides two Open Collector Faults that appear at Pins 28 & 10 on J8.
Mod Fault:
Demod Fault:
The open collector faults are intended for use in redundancy switch applications in order to
provide quick status indications.

3.5 Baseband Processor Card

The Baseband Processor Card (BB Card) contains two major subsystems – the Baseband
Processing System and the Monitor and Control Subsystem.

3.5.1 Baseband Processing

The Baseband Processor performs all of the functions required for an IBS/IDR Framing Unit, a
Reed-Solomon Codec, an E1/T1 Drop and Insert System and a Turbo Codec. In addition, the
Baseband Processing Section provides for Transmit clock selection and rate adaptation as well
as a rate adapter and Plesiochronous/Doppler (PD) Buffer in the receive direction. A multiplexer
is also provided for the SCT Clock Source for Loop Timing Applications. The transmit and
receive paths may be configured independently under processor control.
3-8
De-energized when any transmit side fault is detected.
De-energized when any receive side fault is detected.
De-energized when any fault that is not explicitly a Tx or
Rx Fault such as an M&C or Power Supply Fault.
Will sink up to 20 ma (maximum) until a transmit or
common fault is detected. Will not sink current if a fault
is detected.
Will sink up to 20 ma (maximum) until a receive or
common fault is detected. Will not sink current if a fault
is detected.
DMD20 Universal Satellite Modem
TM103 - Rev. 1.1