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CDD-880 Multi Receiver Router
Appendix D
D.2
ECM Operational Scenarios
D.2.1
Scenario 1 – VMS Initial Registration Process
For proper registration with the VMS, initialization (power-up and bootup) of the ECM-enabled
CDM-840 is required.
Upon initialization, the CDM-840:
1. Receives a VMS Announcement, sets up an active VMS IP Address, and initializes ECM TAP
processing;
2. Transmits a registration request using a selected SAS, and sets a "Needs Slot" flag in the RID
message;
3. Receives the HCC response, through the TAP, assigning an SRS;
4. Continues to transmit the registration request message in SRS;
5. Receives registration from the VMS (Standard Processing);
6. Transmits a registration acknowledgement to the VMS in SRS – it signals the HCC by clearing
"Needs Slot" and sets the "Registered with VMS" and "Need to be Switched" flags in the RID
message.
7. Receives the HCC response, through the TAP, as an acknowledgement – the HCC then clears
the SRS allocation and sends ECM switch requests to the VMS on behalf of the CDM-840
(Standard Processing);
8. Waits for VMS dSCPC assignment (Standard Processing).
D–7
MN-CDD880
Revision 2
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