Comtech EF Data VMS v3.12.x Vipersat - Manual (Page 277)

Chapter 4 - Configuring Network Modems 4-59
MN/22156, rev 12 Devices
For the CDM-840 Remote unit, the transmitter configuration settings are
presented for the VersaFEC return path (figure 4-39).
Figure 4-39 VersaFEC Modulator dialog, CDM-840
In order to gain entry in the network and register with the VMS, the CDM-840
Remote modulator requires minimal configuration by the operator due to the
fact that many of the transmit parameters are automatically set according to the
TAP message that is received from the HCC. Only the following parameters
have to be set manually, as determined by the site link budget:
• Tx Scrambler, Roll Off, and Spectrum Invert
• Power Level
• Carrier State – Must be set to On for modem to transmit
Once the Remote is successfully registered, the modulator parameter settings
are managed by the VMS, except for:
• FEC Type – This is fixed at VersaFEC
• Tx Scrambler, Roll Off, and Spectrum Invert