Throughput Class and Packet Sizes

You can access the Throughput Class and Packet Sizes window from the Link Editor.

The parameter values are stored in the link configuration files /etc/opt/SUNWconn/x25/config/link_config_nnnn.cfg, where nnnn is the four-digit number that indicates the link number (for example, the file link_config_0004.cfg contains the parameters for link number 4).

The Throughput Class and Packet Sizes window allows you to set values for throughput class parameters and to set Layer 3 (network layer) window and packet sizes.

Throughput Class (thclass_type)

The standard range for throughput class, as specified in ISO 8208, is 3 through 12, corresponding to a range of 75 to 48000 bps. However, Solstice X.25 supports 0 through 15, allowing for non-standard X.25 network implementations. If you connect to a non-standard network, use the throughput class options in the Special Parameters window (see "Special Parameters") to specify values for that network. If you need to use non-standard values, your service provider should tell you what they are.

Negotiate Toward Defaults (thclass_neg_to_def)

Allows for configuration for non-standard X.25 networks, such as TELENET (a US network). The default (No) is the appropriate choice for the vast majority of network connections. When set to No, negotiation is towards mutually acceptable minima, rather than the default values.

Packet Size - Maximum NSDU Length (maxnsdulength)

This determines the maximum size (in bytes) to which packets with the M (more data) bit set can be concatenated. This parameter has a range of values from 1 to 32000. The default maximum size is 256.

Network Profile (modulo)

Set to modulo 8 or modulo 128 according to whether your network uses packet sequence numbers ranging from 1 to 7 or 1 to 127.

Window Size (locmaxwinsize, remmaxwinsize, locdefwinsize, remdefwindsize)

You need to specify the Default and Maximum packet sizes for the local and remote networks. Window sizes can be in the range 1 to 7 for modulo 8 networks or 1 to 127 for modulo 128 networks. The default must be less than or equal to the maximum.