Front Panel Operation Revision 4
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
6–63
When Flow Control is Enabled (see (CONFIG: INTF)(GBEIX) FlowControl in Section
6.2.2.4.2), the modem begins to send Pause Frames to any device connected to the
Ethernet Data Interfaces at approximately 87% capacity. Pause Frames cease to be
sent to the Ethernet Interfaces when the WAN Buffer Full Status drops below 75%
capacity.
Press ENTER or CLEAR to return to the previous menu.
6.2.3.8 (Monitor:) MEO (Medium Earth Orbit)
This menu is not available when in Normal (Geostationary) operation (Section
6.2.2.1.2 (CONFIG: NetSpec) Operating Mode).
AntId:0 AntStat:0 SatId:None Mute:0
Handover:00
This read-only screen indicates the MEO operating state. All status elements are generated by
the ACU (Antenna Controller Unit) as follows:
(Antenna ID) This is the identification number of the antenna that the modem it is linked with.
(Antenna Status) This is the status of the antenna that the modem is linked with.
(Satellite ID) This is the identification number of the satellite the modem is linked with.
This is the status of the BUC (Block Up Converter) that the modem is linked to.
This is the number of seconds remaining in the antenna handover window.
Press ENTER or CLEAR to return to the previous menu.
6.2.3.9 (Monitor:) DPD (Dynamic Predistortion Parameters)
CnC-Params: Freq-offset=-123.4kHz
Compensation:+1dB Delay=230.4ms
When enabled and locked, this read-only screen displays the DPD performance data:
• The Monitor: DPD screen refreshes once every second.
• DPD parameters must fall within the tolerances specified in Section 1.3.8 DoubleTalk
TM
Carrier-in-Carrier
®
(CnC).
• Ideal operation occurs when the CnC Ratio is 0 db. Ratios that are lower or higher –
approaching ±7 dB – will cause degradation. Ratios beyond ±7 dB may cause complete
unlock of circuit.
• The Delay in a properly working CnC link is typically between 230 ms and 290 ms. Delay
when bench-testing CnC operation is typically less than 100 µs.
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