Ericsson ZAT 19.2 Operation Manual page 221

owcontrol and buffering
8.1.3 DCE to DTE flowcontrol: \Qn (Local flow control)
\Q controls how the modem signals to the DTE. The following
combinations are possible :
. No flowcontrol.
XON/XOFF flowcontrol.
CTS signal flowcontrol.
103 ae ~ 1. ICTS signal flowcontrol.
"A XON/XOFF flowcontrol.
8.1.4 DCE to DCE flowcontrol: \Gn (Line Flow control)
\Q controls how the modem signals to the remote modem/DTE.
The following combinations are possible :
\GOgta] ae : "1 No flowcontrol.
AG? em : | XON/XOFF flowcontrol both on received and
\G4
pee
"| transmitted data.
\G2g=
~TXON/XOFF flowcontrol is used for received
data but received XON/XOFF is ignored and
passed directly lo DTE as dala.
8.1.5 When to use flowcontrol
Flowcontrol should be used when there is a mismatch between
linespeed and DTE speed.
When using any of the internal modem protocols (see chapter
9), flowcontroi should be used even if the DTE is using the same
speed as the line speed, because the protocol may slow down
the line speed due to retransmissions caused by a noisy line.
The recommended DTE to DCE flowcontrol is RTS since this is
data independent (XON/XOFF characters are ignored) and the
recommended DCE to DTE flowcontrol is CTS for the same
reason. Regarding DCE to DCE flowcontrol, this ts only
necessary in buffered mode since any protocol implies DCE to
DCE flowcontrol. The DCE to DCE flowcontrol is normally not
needed.
LZTR104006 1.00 8-3
Zat 14.4/14.4-7 and 19.2/19.2-7