Comtech EF Data CDM-840 User Manual
Page 127
CDM-840 Remote Router
Revision 2
Ethernet-based Remote Product Management
MN-CDM840
6–59
• Tx LO Frequency – Assign a value, in MHz, to the Tx LO (Low Oscillator) Frequency.
• Base Power (–40.0 to 0.0) – Enter the power level, in dBm, for transmission of the Aloha
ECM signal. This level was determined for this unit when its terminal was commissioned,
and must be calibrated with the satellite provider.
Click [Submit] to save.
ECM Remote Status (read-only)
• Cycle Length – The Cycle Length is the total length of time, in milliseconds, between the
start of a transmission and the completion of the transmission cycle (TAP) transmitted by
the CDD-880 to the CDM-840 or CDM-840 Remote Routers in the ECM group. It is the
product of the number of slots and the slot length (consisting of the preamble, data slot
size, and guard band).
• Aloha State – The Aloha State indicates the current state of this unit during the ECM cycle:
Unit State
Description
Idle
Unit is not transmitting; either inactive or waiting for switching assignment.
Active
Unit is actively transmitting (probing) to the Hub for either registration or request for switching
to dSCPC.
Switched
Remote has successfully switched from ECM to dSCPC.
• Current Tap – Indicates current value of sequential progression of TAP message
transmission. Ranges from 0 to 255, then repeats.
• Current Slot – The time slot number that has been assigned to this unit in the transmission
cycle for switching from ECM to dSCPC.
• Home State Revert Timer – The time, in seconds, that must pass without receiving
communications from the HCC (Hub Channel Controller – i.e., Demod #1 on the CDD-880,
the designated ECM controller) TAP message before this unit is reverted from dSCPC mode
back to ECM to re-establish communications settings for receiving the TAP. This parameter
is set in the VMS.
• Probing Duration – Amount of time, in seconds, that this unit has been transmitting to the
HCC to request registration and switchout.
• Seconds Until Next Probe – The time period, in seconds, before this unit will again transmit
to the HCC.