Comtech-ef-data OM20 Uživatelský manuál stáhnout pdf (Strana 47)

OM20 Universal Outdoor Modem OM20 Theory of Operation

MN-OM20– Revision 5 4–9

 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

Usage of the modems loopback capabilities in conjunction with the Ethernet

data interface can produce undesirable network loops. In order to run any

type of data test with an Ethernet interface you must utilize two modems

connected back to back. Simply using one modem and a loopback will not

produce the desired results.

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Comtech-ef-data OM20 Uživatelský manuál Strana 47