User guide

Chapter 5 - VMS Services 5-31
VMS Service Managers
Using this dialog you can change the FEC and Modulation characteristics of the
uplink SCPC carrier when manually switched.
Revert Uplink Carrier
The Revert Uplink Carrier command returns the remote modem to its home
state settings. This command is appropriate to use when SCPC transmission is
no longer required, switching back to STDMA mode, or communications with
the remote have been lost and it is unknown whether or not the modem is still
transmitting. Unlike the Reset command (see below), the bandwidth slot is
retained in case the modem communications are restored.
Selecting the Revert Uplink Carrier command from the drop-down menu in
figure 5-38 will display the Revert Uplink confirmation dialog shown in
figure 5-44. Clicking the Yes button will cause the selected unit to revert to its
home state.
Figure 5-44 Revert uplink carrier dialog
Reset Uplink Carrier
As with the Revert command (see above), the Reset Uplink Carrier command
returns the remote modem to its home state settings. However, this command is
appropriate to use when communications with the remote have been lost and it
is known that the modem is not transmitting so as to prevent the occurrence of
an interfering carrier. The bandwidth slot is freed for use by another network
device.
Because of the possibility of an interfering carrier being created if the remote is
still transmitting, selecting the Reset Uplink Carrier command shown in
figure 5-38 displays the Reset Uplink warning shown in figure 5-45.
Figure 5-45 Reset uplink warning