Comtech EF Data CDD-56X Series Vipersat - Manual (Page 47)

Chapter 3 - Using the Command Line Interface (CLI) 3-13
MN/22137, rev 1 Vipersat Configuration
mitting back to the Hub. The Remotes transmit on a contention basis and should
a collision occur, the Remote will back off for a specified period and try again.
Once it obtains one of the available slots, the Remote will hold onto the slot
until it registers with the VMS and receives assignment into dSCPC, or until all
necessary transactions are completed. The slot is then released for use by
another Remote unit that is attempting to enter the channel.
Remotes can be set to one of four operating modes—Disable, Offline, Wait, and
Online—from the ECMv2 Mode command in the STDMA menu. In addition,
commands for setting parameters to accomodate any mismatches between the
Hub LNB and the Remote BUCs are presented: LNB LO Frequency (Hub),
BUC LO Frequency (Remote), and Satellite Conversion Frequency.
ECMv2 Mode
This menu item appears for Hub expansion and Remote expansion units operat-
ing in ECMv2 only.
Each unit can be set to a designated mode of operation in ECM:
• Disable – the ECM function for this unit is disabled.
• Offline – the unit will not transmit (muted).
This mode may be chosen for radio silence applications.
• Wait – the unit will register with the controller and remain in the ECM
wait queue without assignment for switching into dSCPC mode. This
mode may be chosen by operators who wish to manually control (via
diagnostic switch) when a unit is to be switched and utilize bandwidth
from the pool.
• Online – the unit will register with the controller and request dSCPC
bandwidth for switching.
In order for a unit to automatically switch into SCPC mode and pass data traffic,
the ECMv2 Mode must be set to Online.
Figure 3-10 ECMv2 Mode prompt
Tip: For purposes of commissioning the terminal with a continuous carrier, the
Entry Channel mode can be set temporarily to Disable. Once this process
is completed, set the Remote back to the desired mode for normal
operation.