Comtech EF Data SDM-650B Installation And Operation Manual page 284

Asynchronous Overhead Channel Unit
BBLoopBk
(Test Mode Configuration
Option)
INTF_LBk
(Test Mode Configuration
Option)
TX CODE
RX CODE
TX 2047
BUF_SIZE
BUF_CNTR
TX BAUD
F–26
Programs the modem for baseband loopback operation.
When baseband loopback is turned ON, baseband terrestrial data is
looped back on the customer side of the interface.
Note: Asynchronous data is not looped back in the baseband loopback
operation.
On entry, the current status is displayed with the flashing cursor on the
first character. Use the arrow keys to select ON or OFF. Press [ENTER]
to execute the change.
Programs the modem for interface loopback operation. When interface
loopback is turned ON, data is looped back on the modem side of the
interface.
On entry, the current status is displayed with the flashing cursor on the
first character. Use the arrow keys to select ON or OFF. Press [ENTER]
to execute the change.
Note: Interface loopback only works when the TX data rate matches the
RX data rate.
Programs the transmitter for AMI, B8ZS, B6ZS, or HDB3 data.
On entry, the current coding format is displayed. Use the arrow keys to
select the desired coding format. Press [ENTER] to execute the
change.
Programs the receiver for AMI, B8ZS, B6ZS, or HDB3 data.
On entry, the current coding format is displayed. Use the arrow keys to
select the desired coding format. Press [ENTER] to execute the
change.
Programs the TX 2047 pattern ON or OFF.
This test mode is only available when AUPC is turned ON in the Utility
menu.
On entry, the current status is displayed with the flashing cursor on the
first character. Use the arrow keys to select ON or OFF. Press [ENTER]
to execute the change.
This configuration function is used to set the size of the buffer.
On entry, the current buffer length is displayed. Use [
the desired buffer size. The buffer size will be displayed in ms or bits.
Enter the Utility menu to change the buffer units to milli-seconds or bits.
32 to 262144 bits, in increments of 16, can be selected. If ms is
selected, 6 to 96 ms, in increments of 1 ms, can be selected. Press
[ENTER] to execute the change.
This configuration function is used to center the buffer.
Press [ENTER] twice to center the plesiochronous buffer.
Programs the transmitter baud rate.
On entry, the current transmitter baud rate is displayed with the flashing
cursor on the first character. Use [
The baud rate may be programmed from 110 to 38,400 bit/s. Press
[ENTER] to execute the change.
SDM-650B Satellite Modem
↑ ] and [
↑ ] and [ ↓ ] to select the desired rate.
↓ ] to select
Rev. 5