gettydefs (2)

[Michalas Othon]

>I.Ioannou wrote:
>> 
>> Gia thn akribeia, einai enas digi portserver, setarismenos na
>> kanei redirect tis seirakes kateytheian se ena kanali pou exei
>> aniksei meso enos programmatos ths digi (rtty) metaksi portserver
>> kai Linux.
>
>  Xmm, OK. Kai o port-server einai syndedemenos sto Linux-box mesw
> thin-ethernet (coaxial dhladh), ypo0etw. H ypo0etw la0os;..................

Gia opoion exei xrono idou h logikh tou systhmatos (apo thn Stallion)

Communications Server remote port facility is a feature that allows UNIX 
applications to treat the serial ports on a LAN-connected Communications 
Server unit as if they were serial ports on the local machine. This provides 
a convenient method for using modems, printers and other serial devices 
connected to an Communications Server port, as well as providing the ability 
to run dedicated applications on these ports.
The remote port facility is implemented by a UNIX application called svr_tty 
and the Telnet Listener capability of the Communications Server. A block 
diagram showing the various pieces and their relationships is shown below:

[application]
 |
[Slave tty]
 |
[Master tty]
 |
[rtty]------------tcp/ip-----------[TerminalServer]


Applications talk to the serial ports on a Communications Server unit via a 
UNIX pseudo-tty. The actual transfer of data between a pseudo-tty and 
Communications Server serial port is done by a svr_tty daemon process. 
svr_tty reads data the master end of the pseudo-tty and passes it to the 
Communications Server and vice versa. svr_tty uses a simple protocol to 
communicate with the serial ports on an Communications Server unit via 
Telnet Listeners (processes that run within the Communications Server and 
transfer data between the network and serial ports).
Note: The use of a UNIX pseudo-tty imposes some limitations, although these 
are not normally a problem for most applications. The same limitations occur 
in other situations where pseudo-ttys are used, i.e. a remote login 
connection using telnet or rlogin. The major difference between a real 
serial port and the pseudo-tty which provides a remote port connection is 
that hardware-related characteristics such a baud rate, number of bits per 
character, hardware flow control, etc. cannot be set by the application 
program using the normal UNIX API (ioctl). These characteristics must be 
configured in the Communications Server using the facilities it provides 
(command line interface, configuration files, etc.)


O8wn
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