| Sounds like a flow control problem. What settings are you using for:
a) Your TCP/IP package's port speed and flow control type, PPP/SLIP
compression, and MRU/MTU
b) Your modem's typical connect speed, error correction, and compression,
and its DTE speed, flow control type, and speed buffering (if settable)
c) Your PPP/SLIP server's flow control type, compression type, MRU/MTU,
and character escaping (e.g., set port ppp lcp map xxxx on a DECserver).
-Tom
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| re: -1
Your TCP/IP package's port speed and flow control type, PPP/SLIP
compression, and MRU/MTU
..... not sure what to do here and where to do it .. please clarify?
Your modem's typical connect speed, error correction, and compression,
and its DTE speed, flow control type, and speed buffering (if
settable)
..... connect speed set at 115200 - error correction set to ""use error
control - compress data" --- DTE speed = can't find it? - speed
buffering = "use FIFO"
Your PPP/SLIP server's flow control type, compression type, MRU/MTU,
and character escaping (e.g., set port ppp lcp map xxxx on a
DECserver)
...... Use Flow Control = Hardware (RTS/CTS)
Does this help ?????
Thanx .... d.
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| It seems that you got your answers all from the same place, probably
your PPP/SLIP dialer/emulator. I don't know what that is or on what
platform, so I can't help you much with details. What you have seems to
be right, but you need to check the other places as well.
There are at least 3 places that have relevant settings that must be
coordinated:
1) Your dialler/TCP/IP configuration. This will have three sets of
settings:
a) Basic port communications settings, including port speed
(115200), the type of flow control used between your PC and the
modem (hardware/RTS/CTS), number of data (8) and stop (1) bits,
and parity setting (none). This is what your PC uses to talk
to your modem. Note that in order to use a port speed of
115200, you need an internal modem with a built-in UART or
an external modem _and_ a serial port with a 16550A UART.
c) Modem initialization and dialling strings (see 2)
b) PPP/SLIP/TCP/IP options, including PPP/SLIP compression (on),
MRU/MTU/MSS/RWIN (x/y/y-40/n*(y-40) : 296/296/256/1012,
552/552/512/2048, etc.)
2) Your modem. Modem characteristics are set by the dialler
using an "AT..." initialization string prior to the "ATD..." dial
string. The initialization string varies according to the
particular modem, but important characteristics include the DTE
speed (should be the same value as the port speed above), type of
flow control (set to same as above), error correction (on),
compression (optionally on - OK if your port runs at 115200),
and speed buffering (usually on by default). The modem also has
a "connect" speed, which is the speed by which it communicates
with the other modem. Don't confuse this with the DTE speed, which
is the speed between your PC and your modem (and which should be
4 times the maximum connect speed in a V.34 modem).
3) Your PPP/SLIP server. This will have its own speed and flow control
between _its_ modem and _its_ port. If it's not set to use
hardware flow control and it _is_ running at 9600 bps or better,
you may have trouble with it no matter what you do. In any case,
if it's using XON/XOFF flow control, XON and XOFF characters in
the data stream have to be escaped. In addition, the
PPP/SLIP/TCP/IP parameters at the server should be consistent
with those you set in your PPP/SLIP/TCP/IP package. If your
server is a DECserver, all these things are set using a series of
"set port ppp ..." or "set port slip ..." commands before you
issue the "c ppp" or "c slip" command. Other kinds of servers
will be different.
-Tom
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