User manual IBM TOKEN-RING PCI FAMILY ADAPTER

[. . . ] IBM Token-Ring PCI Family Adapter User's Guide Includes information about: IBM 16/4 Token-Ring PCI Adapter 2 IBM 16/4 Token-Ring PCI Adapter 2 with Wake on LAN IBM High-Speed 100/16/4 Token-Ring PCI Adapter Note Before using this information and the product it supports, be sure to read "Safety Information" on page vii and Appendix H, "Notices" on page H-1. First Edition (September 1998) The following paragraph does not apply to the United Kingdom or any country where such provisions are inconsistent with local law: INTERNATIONAL BUSINESS MACHINES CORPORATION PROVIDES THIS PUBLICATION "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some states do not allow disclaimer of express or implied warranties in certain transactions, therefore, this statement may not apply to you. This publication could include technical inaccuracies or typographical errors. Changes are periodically made to the information herein; these changes will be incorporated in new editions of the publication. [. . . ] MaxTransmits (OS/2 only) This parameter specifies the maximum number of transmit queue entries. The value should be set high enough to accommodate the sum of all MaxTransmits for all protocol drivers using the adapter concurrently. Valid values: 1 to 128 The default is 31. © Copyright IBM Corp. DOS and OS/2 NDIS Device Driver Parameters in PROTOCOL. INI Parameter MaxTxFrameSize (OS/2 only) Explanation This parameter specifies the maximum frame size that can be transmitted on the LAN. The maximum frame size supported by the NDIS device driver is the lesser of the following values: The value of this MaxTxFrameSize parameter Total Receive Buffer Area (see the MinRcvBuffs parameter) The physical frame size capacity of the network (4500 bytes for 4-Mbps Token Rings and 18 200 bytes for 16-Mbps and 100-Mbps Token Rings) Do not count the 4 bytes of FCS defined for a frame when setting this parameter value. In some environments, performance can be increased by operating server and client at larger frame sizes. MinRcvBuffs (OS/2 only) This parameter specifies the minimum number of receive buffers that are allocated. The Total Receive Buffer Area for the adapter is calculated using the following formula: Total Receive Buffer Area = MinRcvBuffs × RcvBuffSize Note: To receive the maximum length frame that is supported by the attached network, the Total Receive Buffer Area must be larger than the maximum frame size that is allowed for the network, which is 4500 bytes for 4-Mbps Token Rings and 18 000 bytes for 16-Mbps and 100-Mbps Token Rings). A smaller Total Receive Buffer Area will use less system memory but will correspondingly reduce the size of the largest frame that can be received by the NDIS device driver. The maximum frame size supported by the driver can be further limited by the MaxTxFrameSize parameter. RcvBuffSize (OS/2 only) This parameter specifies the size of each receive buffer. FullDuplex This parameter permits the device driver to activate Token-Ring full-duplex operation if supported by the network. The MaxTxFrameSize parameter may need to be adjusted separately, depending on network requirements. LoopBack Determines whether or not the adapter will copy a frame that it is transmitting if the destination address is recognized by the adapter. Valid values: Yes No Indicates that transmit frames whose destination is this adapter will be transmitted and then received by the adapter. Indicates that transmit frames whose destination is this adapter must be looped back by the protocol stack. The default is No. C-2 IBM Token-Ring PCI Family Adapter Table C-1 (Page 3 of 4). DOS and OS/2 NDIS Device Driver Parameters in PROTOCOL. INI Parameter TxPriMax Explanation This parameter specifies the value of the maximum token access priority that will be allowed for frames sent on the high-priority transmit channel. High-priority transmit frames whose Frame Control priority value exceeds the value of this parameter will have their token access priority reduced to the value specified by this parameter. Frame Control is a field in the IEEE 802. 2 Logical Link Control (LLC) header. TxPriThresh This parameter specifies the frame priority value that will be used to transmit on the adapter's high-priority transmit queue. IEEE 802. 2 LLC frames that contain a frame priority setting (in the Frame Control field) that is equal to or greater than the value of this parameter are treated as high-priority frames. LLCOnly This parameter indicates whether only LLC frames should be copied by the adapter when it is running in promiscuous copy mode. [. . . ] The description of the logical structure, formats, protocols, and operational sequences for transmitting information units through, and controlling the configuration and operation of, networks. Note: The layered structure of SNA allows the ultimate origins and destinations of information, that is, the end users, to be independent of and unaffected by the specific SNA network services and facilities used for information exchange. delimiter. The access control field contains a bit that indicates to a receiving device that the token is ready to accept information. If a device has data to send along the network, it appends the data to the token. [. . . ]