User Guide: Technical Reference
SECTION 3 OPERATING THE
ioLink 4
PRELIMINARY
Customer Support (202) 333-7031
-3-7
b. Far-end Loopback
Selecting ON for this test mode places the modem into an internal loopback mode at the line interface
chip. In this mode, the data from the far end of the link is looped back to it (as well as passed through to
the DSX or G.703 interface). Input from the DSX or G.703 interface is ignored. This mode permits one to
test the whole link from the far side.
c. Source Loopback
Selecting YES for this test mode places the modem into a loopback mode at the line interface chip. In this
mode, the data from the user device connected to the DSX or G.703 interface is looped back to it as well
as passed through the modem to the far end of the link. Data from the far end of the link is ignored. This
mode ensures that the input data source is operating correctly.
d. Set Factory Default
Selecting OK at this menu item sets the modem to the default configuration (indicated by the parentheses
in the above table) cycle power.
User
RF
Spreading
Section
LIU
FEC
IF
Section
User
RF
Spreading
Section
LIU
FEC
IF
Section
X
Figure 3-4. Source Loopback
Figure 3-3. Far-end Loopback
