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P300H P300 Series Modem Installation and Operating Handbook Page 86
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)
Rx: 1:Baseband 2:Buffer/Clocking
3:Demod 4:Rx=Tx [On]
Change, Rx Menu (Rx set to follow Tx)
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
Note that options 2-5 on the top menu are only displayed when the SERVICE option is set to something other
then Off, and so initially the screen may only show the SERVICE and Rx=Tx options.
Rx=Tx Enabled
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
Note: If Rx=Tx is enabled, and
the Tx Service is set to Off, then only the Rx=Tx selection will be the only
one displayed.