R&S M3SR 4100 Series, Operating Manual

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M3SR Series 4100 Selecting the Type of Link Setup
4.80 Operating Manual 6175.4760.02 – 01
4.4.4.3 Selecting the Type of Link Setup
Softkey Type Description
Listbox
In the central area the currently active value is
displayed.
1. Press 'LSU Mode' softkey.
2. Select desired LSU mode from listbox.
3. Press 'ENT' to confirm.
Possible values:
• FLSU async (Fast Link Setup Asynchro-
nous)
• FLSU sync (Fast Link Setup Synchro-
nous)
FLSU async: The next call will be an asychro-
nous call, i.e. the duration of the call is extend-
ed to the time it takes to cycle through all
scanning frequencies. This ensures that an
asynchronously but periodically scanning ra-
dio scans the frequency which is used for the
call.
FLSU sync: This is the fastest type of link set-
up, but it requires a time accuracy of better
than 180 ms. All participating radios have to
keep synchronism by means of GPS synchro-
nization or a time request to a time server.
If the radio's time uncertainty value is out of
limit (i.e. exceeded), the latter asynchronous
call procedure is used for calling.
To achieve the needed time accuracy of better
than 180 ms without GPS reception on time
slaves (time server = off), proceed as follows:
• Set time source.
• Set data and time within a +/- 7 minute tol-
erance.
• Press softkey ‘Time REQ’ in ALE CFG 3/3
menu.
• After receiving time information from the
time server, the radio should show ‘Time
Uncertainty: 180 ms’.