Ericsson ZAT 19.2 Operation Manual page 220

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DCE_RX
When the line speed is higher than the DTE speed or the DTE
has stopped data flow with DTE to DCE flowcontrol the modem
must stop the remote DCE or DTE from sending data. This is
called DCE to DCE flowcontrol and uses only software
(XON/XOFF) signalling.
The methods used for flowcontrol are hardware (CTS and/or
RTS) and software (XON/XOFF) signalling. Below is an
explanation of these terms
RTS
This is a hardware signal from the DTE to the modem which is
used (if enabled) to tell the modem when the DTE is ready for
more data.
CTS
This is a hardware signal from the modem to the DTE which is
used (if enabled) to tell the DTE when the modem is ready for
more data.
XON/XOFF
These are data bytes inserted into the data stream to tell the
receiver (DTE/modem/remote) to stop (XOFF) or restart (XON)
its transmitter. This means that you may not send these bytes as
data in your data stream since they will be lost and cause
unintentional starting/stopping of the transmitter. XON/KXOFF
bytes may be stripped from the data stream by the modem
(normal) or passed on (transparent). If passed on, this means
that when the DTE starts or stops the modem transmitter by
sending XON or XOFF the XON/XOFF will also be sent to the
remote DCE/DTE.
8.1.2 DTE to DCE flowcontro!: \Qn \Xn
\Q controls how the DTE signals to the modem and \X controls
whether the modem is transparent or not. The following
combinations are possible _
No flowcontrol.
| XON/XOFF flowcontrol, XON/XOFF
"characters are stripped from the data
stream to remote.
: tes XON/XOFF flowcontrol, XON/XOFF
characters are not stripped from the data
stream to remote
LZTR104006 R1.00
Zat 14.4/14.4-7 and 19.2/19.2-7