Avocent ESP Serial Hub, Installer/User Manual, Page: 27 / 96

Chapter 3: Connection Methods, Attributes and Configurable Features 17
Table 3.2 describes this method’s configurable items for each serial port.
Raw TCP server
The raw TCP server connection method allows a remote client to make a TCP socket connection to
a serial port on the ESP hub and then transmit/receive data using standard TCP. The remote client
initiates the TCP session, using a predefined IP port number.
When this method is enabled, the TCP server will accept a connection from any valid remote IP
address. There is no filtering of remote addresses. When a remote raw TCP client attempts to
establish a connection, the raw TCP server will accept the connection only if the port is not already
Table 3.2: Telnet Server Connection Method Configurable Items
Item Description
Enable/disable
Enables or disables the Telnet server connection method on the port. (See Exclusivity and
restrictions on page 15.)
The default value is disabled.
Local IP port
number [base]
Specifies the IP port number on which the Telnet server will listen.
If the all ports option is being used for configuration, this value specifies the local IP port
base. Each port’s actual local IP port number will be the base plus the port number. For
example, if 6000 is specified as the base, the local IP port number for port 1 will be 6001,
port 2 will be 6002 and so on.
This value (or its result when using the all ports option) must meet the following criteria:
• It cannot conflict with the port numbers specified for other enabled connection methods
on any port.
• Valid values are 1024-65535, except 4000 and 4100, which are reserved.
• When using the all ports option, 4000 or 4100 may be used as the base. However, you
cannot specify a base that, when added to a port number, will equal 4000 or 4100.
When using the all ports option, all ports must be valid or the entire selection will not
be accepted.
The default value is 3001 for port 1, 3002 for port 2 and so on.
Inactivity time-
out
Specifies the length of time before the Telnet session is disconnected if there is no activity.
Valid values are 0-65535 seconds. A 0 value disables the inactivity time-out.
For example, a value of 60 indicates the Telnet session will be disconnected if there is no
activity for a period of 60 seconds.
The default value is 0 (disabled).
Serial buffering
Specifies the length of time accumulated serial data should be buffered before being sent
across the network to the Telnet client. Valid values are 0-65535 hundredths of a second. A
0 value indicates that data will be sent as soon as it is available.
For example, a value of 100 indicates that once serial data is received, it will remain
buffered up to 1 second (100 hundredths of a second), at which time all data will be sent.
If the buffer becomes half full, the time is ignored and the data is sent.
The default value is 0 (send immediately).