Emulex DCP_link manual Packet Level Parameters

7-6 Chapter 7

Maximum Frame Size (Nl) - Determines the maximum frame size (in octets) allowed to be received on the link. It is automatically configured from the packet size and maximum packet size information.

Retry Count (N2) - Determines the maximum number of times a frame should be retransmitted because of the expiration of the Retry Timer (Tl). A large value for this parameter increases the probability of a correct transfer between the DTE and DCE. A small value permits faster detection of a permanent error condition.

Retry Time-out (TI) - Determines the time, in seconds, to wait for an acknowledgment of the oldest transmitted frame. If no acknowledgment is received within this set time, an attempt is made to determine the status of the remote device.

Disconnect Time-out (T3) - Displays the value of the T3 timer. After attempting to connect the link by sending N2 Set Asynchronous Balanced Mode (SABM) frames on TI expiration, the Data-Link layer continues sending SABM frames when the T3 timer expires. This setting isn’t configurable.

Idle Time-out (T4) - Specifies the amount of time the local DTE waits (when a link becomes idle) before attempting to poll the partner node for status. If the partner node does not respond to the polls, the link is reset and all current virtual calls are cleared or reset. This setting isn’t configurable.

Frame Node Type - The X.25 frame level configures DCE/DTE protocol handshaking. Generally, an X.25 service provider will require DTE.

Packet Level Parameters

Local DTE Address- Specifies the X.25 address (up to 15 digits) of the local DTE. It should match the address assigned by your attached network. This address is included in the Calling Address field of the outbound Call Request packets.

Version - Emulex X.25 specifically supports 1984 CCITT X.25 Recommendation

Role - Determines whether you use DTE or DCE procedures for packet layer operation in the Logical Channel Number (LCN) assignment.