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CDD-880 Multi Receiver Router
Appendix D
Cycle Length: – This read-only value identifies the total cycle length, in milliseconds, of the
•
TAP message.
•
LNB LO Frequency: – Assign the LNB LO value, used to send RF frequency values in TAP
messages. Resolution = 100Hz.
•
Satellite Frequency Conversion: – Assign the correct Satellite Frequency Conversion value,
in MHz, for this hub unit based on the RF equipment used at this site.
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ECM Hub Status (read-only)
•
Current Contention slots available – "Contention slots" are the number of time slots in the
TAP transmission cycle that are available for assignment to requesting (probing) Remotes.
From left to right:
Column
Index
IP
State
Frames Transmitted
Error Frames
D.3.1.1 Tap Message
The TAP message is a standard UDP/IP multicast forward over the outbound channel with a
payload containing the following sections:
•
Standard Vipersat Header (distinguishes TAP from other Vipersat messages)
•
Timestamp field (set by CDM-840 [at WAN interface] when TAP is received)
•
ALOHA Channel Frequency Plan (Frequency, Data Rate, Modulation, and Coding)
•
Slot and Timing Control
Description
This is the automatically assigned internal table index number.
IP address for the identified CDM-840 Remote Router.
Current state of this CDM-840 – one of the following will apply:
• Probing – The unit is requesting service (registration / switching) from the VMS.
• Registered – The unit has been registered with the VMS.
• Waiting to switch – the Unit is awaiting dSCPC switch command from the VMS.
Count of frames received from this CDM-840.
Count of frames received with errors from this CDM-840.
D–15
MN-CDD880
Revision 2
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