SLM-3650 Satellite Modem
Revision 3
Operation
MN/SLM3650.IOM
3–20
B-BAND LOOP BACK
(Test Mode Configuration)
Programs the modem for baseband loopback operation.
When baseband loopback is turned ON, the data and timing signals are switched from the
demodulator to the modulator on the modem side of the interface. The DTE baseband signals
are also looped back from the transmitter data and clock to receiver data and clock on the
customer side of the interface. This is a bi-directional loopback of the baseband data. Refer to
Figure 3-25
for a block diagram of baseband loopback operation.
Upon entry, the current status is displayed. Press [
↑
] or [
↓
] to make the selection. Press
[ENTER] to execute the change.
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 3-26
for the interface loopback block diagram.
Upon entry, the current status is displayed. [
↑
] or [
↓
] to make the selection. Press [ENTER] to
execute the change.
Conditional:
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.
Note:
TX and RX data rates must be equal unless the asymmetrical loop timing option is
enabled.
Upon entry, the current 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.
Conditional:
This menu is only available when the overhead interface PCB is installed.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
