Mainframe Connection Information Requirements for 802.2 DLC

For an 802.2 DLC connection, you require, from your mainframe system administrator, the information detailed in the table below. For each item, the table lists the configuration task that requires the information, and an example value. For details of the local information required, refer to each task.

Parameter from the VTAM System Administrator Task and Example Value Description
Remote Network Name (NETID) Configuring the Local Server: HSTNET1 The network name of the VTAM domain. All resources that comprise this VTAM domain are in this VTAM domain.
Local Control Point (CP) name assigned to the local server Configuring the Local Server: MCOPU020 The unique PU identifier created by the mainframe administrator for the local server. This is specified in the VTAM PU definition for this machine. That is, the CP name matches the PU identifier.
Remote Network Address Configuring the Connection Address: 400000004044 12-digit hexadecimal network address of the remote host system's network controller.
Remote Control Point (CP) Name (also known as SSCPNAME) Configuring the System Identification: HSTMVS The name of the remote system
The XID format used by the host system Configuring the System Identification: 3 (default) The XID format can be either 0 or 3. A format of 3 is generally used for APPC (and must be used for independent APPC LUs). The older format, 0, tends to be used for 3270 devices.
Remote Node ID Configuring the System Identification: None An 8-digit hexadecimal number used to identify the host system on the SNA network. Your mainframe system administrator will advise whether or not you need to use this.
Local Node ID Configuring the System Identification: 05D,22222 An 8-digit hexadecimal number used to identify the local system on the SNA network. The first three digits are the IDBLK and the last five are the IDNUM. These must correspond with the IDBLK and IDNUM fields of the VTAM PU definition for this machine, as defined on the host system.
Maximum Basic Transmission Unit (BTU) Length (also known as I-Frame) Configuring 802.2 DLC Properties: 1493 The number of bytes that can be transmitted in a single data link control frame. This is calculated by subtracting 9 from the MAXDATA parameter of the PU definition for this machine (that is, maximum BTU length = MAXDATA - 9). This is a maximum value. The actual value used is negotiated to the highest value below this figure that is acceptable to both partners.
List of independent LUs for your PU definition. Configuring Local APPC LUs: MCOLU021 These LUs are required for APPC and are defined in the list of LUs defined for your PU on VTAM. You can have multiple independent LUs per PU. All independent LUs for your PU have LOCADDR set to zero under the PU definition on VTAM.
Target LU Name Configuring Remote LUs: HSTCICS1 This should match the LU definition as it exists on the remote system, in this case, a VTAM APPLID definition on the host system. To communicate with a host CICS system, this is the APPLID of the host CICS environment .
List of the dependent LUs defined as terminals with their associated LU number for your VTAM definition. Configuring a 3270 LU for the 3270 Applet:
  • MCOTRM22,2
  • MCOTRM23,3
  • MCOTRM24,4
These LUs are used for terminals to the host. They are not required for APPC, but are very useful for the host CICS configuration. They are found under your PU definition on VTAM. The LU number must match the associated LOCADDR number for this named LU.
The Mode Table defining the session limits for the connection Configuring Remote LUs: #INTER This is used to negotiate the session limits with the host. Normally the host would use the default mode of #INTER. If #INTER is not appropriate, you can define and use another mode. If you need to define another mode, your VTAM system administrator should be able to supply the parameters required, and the Host Integration Server 2006 Helpthe Host.