Properties

Use this page to change the configuration properties of this terminal server. You can change the following properties:

Note: The IP Address and TCP Port values must match the terminal server you are configuring.

Name

Displays the current name given to the terminal server at this IP address. You can change the name at any time by supplying a new name in this field.

This name has no significance to your network configuration; it is simply a convenient way to label the device. You should use a name that uniquely identifies the terminal server (for example, by its location or function).

IP Address

Displays the IP address configured in RealPort for this terminal server. This value must match the IP address configured in the terminal server itself. See your terminal server documentation for procedures to view or set the value.

TCP Port

Displays the RealPort TCP port number configured for this terminal server. The default TCP port number is 771.

If you are having trouble connecting to the terminal server using the default of 771, check the actual TCP Port set in the terminal server. See your terminal server documentation for procedures to view or set the value.

For EtherLite terminal servers, the TCP port number is set to 771 and cannot be changed, so your system may have another problem.

Poll Cycle

The Poll Cycle is the number of milliseconds the RealPort driver waits for additional data to make a full packet (as defined by Max Packet Size) before sending the packet to the terminal server. If the Poll Cycle time elapses and the packet is not full, the packet is sent anyway.

Depending on your system setup, you may wish to increase the default value to cause less traffic on the network.

The valid Poll Cycle range is 10 to 1000 milliseconds.

Max Packet Size

The default Max Packet Size value (1460) optimizes the RealPort driver for TCP/IP over Ethernet. You should change the default only if you are using media other than Ethernet.

Max Packet Size is the number of bytes of data that the RealPort driver will put into a packet. To keep overhead to a minimum, this value must be the same as or smaller than the data portion of the MTU (Maximum Transmission Unit) of the network medium that carries the packet to the terminal server.

If the Max Packet Size is greater than the data portion of the MTU, all of the data in a RealPort packet will not fit in a single media packet, leftover data must be sent in a second packet, and traffic over the network will increase.

Example MTU Packet Structure for Ethernet

Field Size in Bytes
MAC 14
IP(V4) 20
TCP 20
TCP Data 1460
FCS 4

Total MTU size = 1518 bytes

Allowable Max Packet Size range is from 3 to 65,535 bytes.