P300H
P300 Series Modem Installation and Operating Handbook
Page 89
6.7 CHANGE, RX MENU
Many of the Change Rx Menus are identical to the Change Tx menus, and a reference is made back to
the Change Tx description rather than repeat the text unnecessarily.
NOTE ON RX=TX FUNCTION
The Change, Rx Menu has an extra feature over the Change Tx, namely the ability for the Rx path to
track the majority of the Tx configuration parameters (Rx=Tx) to simplify the configuration in symmetrical
links (ie the majority). If Rx=Tx is activated then the following Rx parameters automatically
track
the Tx
parameters:
Service:
All modes
Baseband:
Continuous: data rate. Drop/Insert: all selections
excluding
the timeslots.
Mod/demod:
Modulation, Inner FEC type & FEC Rate, Outer RS FEC, Scrambler, Spectral
Invert
ESC/Aux/BA:
All parameters
Rx parameters which specifically remain independent are:
Baseband:
Insert timeslot selection (only if Drop/Insert active)
Buff/Clk:
Rx Buffer size & clocking mode
Demod:
IF Frequency & Sweep control
Note that setting Rx=Tx
even momentarily
copies the Rx parameters which track the Tx to the Rx
configuration. Toggling this option on then off again provides a convenient way to copy the Tx config to
the Rx (except the IF frequency) should this be required at any point.
The Change, Rx menu then will have different options showing depending on whether Rx=Tx mode is
active:
Rx=Tx Disabled
Rx: 1:Service 2:Baseband 3:Buffer/Clocking
4:Demod 5:ESC/Aux 6:Rx=Tx [Off]
Change, Rx Menu (Rx not set to follow Tx)
Note that options 2-5 on the top menu are only displayed when the
ÍÛÎÊ×ÝÛ
option is set to something
other then
Ѻº
, and so initially
the screen may
only
show the
ÍÛÎÊ×ÝÛ
and
Ψą̃
options.
Rx=Tx Enabled
Rx: 1:Baseband 2:Buffer/Clocking
3:Demod 4:Rx=Tx [On]
Change, Rx Menu (Rx set to follow Tx)
In this mode:
The
Baseband
option is only shown if the Tx baseband mode is set to Drop Mux, and hence the Rx
Insert Mux will be active and the operator needs access to the baseband menu in order to
independently set the insert TS selection.
The
Buffer/Clocking
menu is always shown.
The
Demod
menu provides access to the independent selection of IF Frequency, and demod
Sweep Width control