Comtec CDM-840 Installation And Operation Manual page 280

CDM-840 Remote Router
Appendix G
the CDD-880 to the CDM-840s 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:
o Idle – The unit is not transmitting; either inactive or waiting for switching assignment.
o Active – The unit is actively transmitting (probing) to the Hub for either registration or
request for switching to dSCPC.
o Switched – the 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.
This number is only valid for the current cycle and is intended mostly for
diagnostic purposes during troubleshooting.
•
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.
If this number is greater than 3 seconds, it means that the modem is in backoff
mode.
ECM Tx Statistics
Whenever the modem reverts from dSCPC to ECM, the statistics will clear.
This section provides the following read-only information:
•
Total Count: – This is the total number of transmissions since the modem entered Entry
Channel Mode.
•
Successes: – This is the number of successful (entire) transmissions received by the hub.
G–16
MN-CDM840
Revision 3