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Chapter 4 29
Screens
HSCSD screen
The Master Channel field shows the ARFCN of the TCH. There is only
one ARFCN, as HSCSD systems place all timeslots on the same ARFCN.
On a slave unit, setting this field changes the ARFCN of the downlink
TCH and analyzer appropriately.
On a master unit, this field sets the TCH ARFCN of the current call, or
the TCH ARFCN to be used for the next call. An assignment command is
sent to the mobile on the downlink FACCH.
If you try to change the ARFCN but the measurement timeslot (see page
32) is set to Slave, an error occurs and the setting is ignored. Without
this error, the acknowledgment from the mobile would be missed if the
HP/Agilent 8922 is analyzing the slave timeslot. The error reported is
Select ‘Master’ to measure before signalling mobile.
The value of this field is always the same as the TCH ARFCN on the Cell
Status screen.
NOTE The default is reset when the instrument type (see page 24) is selected.
Limits (GSM900) 1 thru 124
Limits (E-GSM) 0 thru 124; 995 thru 1024
Limits (DCS1800) 512 thru 885
Limits (PCS1900) 512 thru 810
Default (GSM900) 30
Default (E-GSM) 30
Default (DCS1800) 512
Default (PCS1900) 512