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QMultiFlex-400™ Installation and Operating Handbook
6.2.24.9 Rx carrier frequency
Range
IF: 50MHz to 180MHz; Step: 0.0001 MHz (100Hz)
L-Band: 950MHz to 2450MHz; Step: 0.0001 (100Hz)
This is the frequency used to cancel out the 'echo' of the outgoing carrier.
Description:
Ascertain the centre frequency of the returned echo and enter this in the
Rx Carrier Frequency field. The carriers overlap on satellite, so the
returned echo centre frequency may be different to the configured
Modem Tx frequency.
6.2.24.10
Auto Acquire
In addition to the Round-trip delay entries covered above, there is a fourth method, where
the hub cancellation is set to `Auto Acquire`. Once enabled a large sweep window is used
to find the round-trip delay for the looped satellite communications path, without any user
involvement. Auto-acquisition may take a few minutes longer compared to the above
methods where a narrower delay sweep range is defined. When `Auto-Acquire` is selected,
the other delay methods will get greyed out. Once the round-trip delay has been determined
(see Status screen for lock status), this value can then be used to manually enter using the
'Set Delay' method above. It is not advisable to use 'Auto Acquire' permanently and it's
intended use is only for establishing a delay value.
6.2.25
Edit->Memories Screen
The Edit->Memories screens shown in this section allow the user to store and recall modem
configurations (referred to as configuration memories). These can also be uploaded and
downloaded to and from a PC or similar to allow configurations to be shared between
different modems. Using the front panel will allow configurations to be saved and uploaded
via a USB drive (see section 6.3 for details).
The following operations can be performed on configuration memories via the web interface:
•
Store. This allows the current modem configuration to be stored to a named
configuration memory for later use. The memories are non-volatile and will persist
between successive power-ups of the modem. The maximum number of configurations
that can be stored depends on available memory. Configuration memories can be
assigned any desired name using the alphanumeric keypad.
•
Recall. This allows a previously stored configuration to be selected and used in place of
the current configuration.
•
Erase. This allows configuration memories to be deleted.
•
Download. This is used to download one or more configuration memories from the
modem to a PC or equivalent.
•
Upload. This is used to upload one or more configuration memories to the modem.
A default configuration memory called LOAD_DEFAULTS always exists. Recalling it will
reset the modem to its factory defaults. When LOAD_DEFAULTS is recalled from the web
user interface, then the modem's current M&C IP address, netmask, gateway,
takeaway control, Modem ID and passwords are all retained, whereas when selected from
the front panel these go back to their factory defaults. This is done in order not to lose
remote control of the modem from the web user interface when using it. LOAD_DEFAULTS
cannot be erased or overwritten.
Table 6-56 Maximum Round-trip Delay
6-65
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