802.2 Connection Configuration dialog box

RJE Configuration Utility
NJE Configuration Utility

Use this dialog box to configure the 802.2 LLC2 link service. For BARR/RJE, you can access this tab when you configure 802.2 in the RJE Configuration Utility, by clicking Configure on the Communication Link tab. For BARR/NJE, you can access this tab when you configure 802.2 in the NJE Configuration Utility, by clicking Configure on the Barr SNA Configuration dialog box.

What do you want to do?

• Configure BARR/RJE for 802.2

• Configure BARR/NJE for 802.2

See also:

• Communication Link tab

• RJE Configuration Utility overview

• NJE Configuration Utility overview

VTAM parameters (PU macro)

IDBLK
IDNUM

Parameters used on an 802.2 network to identify the remote’s PU definition. The host sends an Exchange ID request (Xid) as the first message to a remote. The remote responds with an Exchange ID response (Xidr) that contains the IDBLK and IDNUM parameters.

VTAM searches for the PU identified by IDBLK and IDNUM and uses this PU for the rest of the communications session. The default IDBLK value is 03D. The default IDNUM value is 12345. These values must match the IDBLK and IDNUM parameters specified in BARR/RJE and BARR/NJE VTAM configuration.

MAXDATA

The maximum amount of data you can send on the PU in one frame. This count includes nine bytes of header information plus the data length. The default value is 1033.

Performance Tuning: You can increase throughput by sending larger frames of data and thus reduce the amount of control information and the total number of frames sent. Send 1024 bytes by setting MAXDATA to 1033 in the Barr software and in the VTAM PU definition. A MAXDATA value of 2057 can result in greater system throughput, but it is not recommended for Ethernet or other LAN equipment that will not support the larger packet size.

DLC parameters

LOCADD

Specifies the MAC Acronym for Media Access Control. address of the network card for the host that you are trying to reach. The value must be a 12-digit hexadecimal value. Bitswapping is performed automatically. The default value is 400000000001.

Remote SAP

Specifies the remote (host) service access point (SAP) used to communicate with the host computer. The SAP allows multiple, independent connections to the network using one physical adapter address. Possible values are multiples of 4 up to the maximum of EC. The default value is 04.