Comtech EF Data C5 - Manual (Page 146)

Operation C5/K1/K3 Integrated Satellite Terminal System
4–20 Rev. 0
INTERFACE LOOPBACK
(Test Mode Configuration)
Programs the modem for Interface Loopback operation.
When INTERFACE LOOPBACK is turned on, data is looped back at
the modem side of the interface. This is a bi-directional loop back of
the data after the base band data has had the overhead added. Refer to
Figure 4-23 for the interface block diagram.
Upon entry, the status is displayed. [
$] or [%] to make the selection.
Press [ENTER] to execute the change.
Note: This menu is only available when the overhead interface
PCB or Reed-Solomon PCB is installed.
LOOP TIMING Programs the transmit clocking to the RX satellite clock.
TX and RX data rates must be equal unless the asymmetrical loop
timing option is enabled.
Upon entry, the status is displayed. Press [
$] or [%] to make the
selection. Press [ENTER] to execute the change.
TX DATA FAULT Transmit data fault. Press [
$] or [%] to select one of the following
modes:
! NONE: The transmit interface fault Data/AIS is not
activated.
! ALARM INDICATION SIGNAL (AIS): Sets transmit
interface fault Data/AIS to monitor a fault condition of all 1s
from customer data input to the modem.
! DATA: Sets transmit interface fault Data/AIS to monitor a
fault condition of all 1s or 0s. This is referred to as a data-
stable condition, which means that the data is not
transitioning.
Upon entry, the current TX data fault that is being monitored is
displayed. Press [
$] or [%] to make the selection. Press [ENTER] to
execute the change.
Note: This menu is only available when the overhead interface
PCB is installed.