Tap Message - Comtec CDM-840 Installation And Operation Manual

CDM-840 Remote Router
Appendix G
While "0" is an acceptable assignation, the preferred practical range is from 1
to 255.
• Guard Band: (1-1000) – Enter the Amount of Transmit Off time, in milliseconds, between
slots to prevent signal overlap.
• Preamble: – This read-only value identifies the preamble length in VersaFEC frames.
• Data Slot Size: – This read-only value identifies the minimum number of Versa FEC blocks in
a data slot.
• Slots in Frame: – This read-only value identifies the allowable total number of slots for each
frame. When assigned slots are needed, they are taken from this pool.
• 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.
Click [Submit] to save.
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
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.
G–18
MN-CDM840
Revision 3