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OM20 Universal Outdoor Modem
Two Form-C Relays under processor control are available on the OM20 connector J2
Mod Fault:
Demod Fault:
Two Open Collector Faults are available on the OM20 connector J3 pins 10 &16
Mod Fault:
Demod Fault:
The open collector faults are intended for use in redundancy switch applications in order to
provide quick status indications.
4.3 Async Port / ES-ES Communications
This port is dedicated for ES-ES Communications supported by either RS232 or RS485 signal
levels. The baud rate and protocol can be selected from the Front Panel. The port may be
configured for a number of communications protocols. Overhead data to/from the UIM is routed
to/from the framer/deframer. This port is also used by SCC Framing for the in-band data.
4.4 Internal Clock
The time and date is kept in order to 'time-tag' system events. User can change the Internal
Clock via the front panel, Web Browser or Terminal ports.
4.5 Loopback Features (Terrestrial & IF)
The modem provides for a number of different loopbacks. The Loopback supported are:
IF Loopback – Tx IF port is looped back to the Rx IF port
TX Terrestrial Loopback - Tx Data port is looped back to the Rx Data port after the
interface driver/receiver. (prior to the framing unit)
TX Baseband Loopback - Tx Data port is looped back to the Rx Data port after the
interface driver/receiver. (after the framing unit)
RX Terrestrial Loopback - Receive Data from the satellite is looped back for
retransmission to the satellite, providing a far end loopback. (prior to the framing
unit)
RX Baseband Loopback - Receive Data from the satellite is looped back for
retransmission to the satellite, providing a far end loopback. (after to framing unit)
TX/RX Terrestrial Loopback - provides both Terrestrial loopbacks simultaneously
TX/RX Baseband Loopback - provides both Baseband loopbacks simultaneously
TM116 – Rev. 1.2
De-energized when any transmit side fault is detected.
De-energized when any receive side fault is detected.
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.
Theory of Operation
4-8
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