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Data Link Parameters Screen

The Data Link Parameters Screen allows you to modify the Data Link Layer communica- tions parameters. In most cases the values of these parameters will remain the default values. The Data Link Parameters menu is shown below.

Figure 3-8. Data Link Parameters Screen

The Data Link Parameters are defined as follows:

TX_RING_LEN - The maximum number of frames which can be queued for transmis- sion on the network. Valid values are 8, 16, 32, 64, and 128 frames. Defaults to 8 frames. Value selected by Tab or Shift-Tab keys. Corresponds to Station Manager Parameter ltxringlen.

RX_RING_LEN - The maximum number of incoming frames received by this station which can be queued for processing. Valid values are 8, 16, 32, 64, and 128 frames. Defaults to 64 frames. Value selected by Tab or Shift-Tab keys. Corresponds to Sta- tion Manager Parameter lrxringlen.

LLC_MAX_BUF - The maximum data size of Link Layer receive buffers. This the largest possible receive frame for the Link Layer. Valid range of 128 to 1497 bytes. Defaults to 1497 bytes. Should be at least 70 less than the Maximum Buffer Size (see the Sys- temParameters Menu). Corresponds to Station Manager Parameter lmaxdb.

DISAB_TX_RTRY - Prevents the normal automatic TX retries when a frame collision oc- curs during transmission. Valid values are ªYº and ªNº. ªYº specifies that TX retries are disabled. ªNº specifies that each TX frame will be retried up to 16 times. Defaults to ªNº. Corresponds to Station Manager Parameter ldrtry.

GFK-1004B

Chapter 3 The GEnet System Manager±Station Configuration

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GE GFK-1004B user manual Data Link Parameters Screen, Data Link Parameters are defined as follows