TCPTYPE parameter

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Type of TCP/IP server address space

Summary

Default value
UNKNOWN
Parameter type
System
Where set
User 0 CCAIN parameters
Related products
All
Introduced
Before Sirius Mods 6.7

Description

This parameter specifies the type of TCP/IP network to which Model 204 is connected. Generally, you can let this parameter default (UNKNOWN is default value). Janus then automatically detects the type of TCP/IP you have on your machine, and it resets the TCPTYPE value accordingly. In this case, IPV4 values are preferred; IPV6 values must be explicitly set.

If you specify type IBM or IBMV6, Janus detects and sets the type of IBM interface it will use, as shown in the table below. Only these values invoke auto-detection.

You can also override auto-detection by explicitly supplying a TCPTYPE parameter value. The likely reason to do this would be if you have multiple TCP/IP stacks installed, and you want to force use of the non-preferred stack.

The valid TCPTYPE values are in the third column below:

Operating systemNetwork versionValueMeaning
z/OS IPV4 only IBM Auto-detect the "best" IBM TCP/IP interface. For z/OS, this is BPX.
BPX IBM BPX (Unix System Services).
HPNS IBM HPNS (High Performance Native Sockets). Note that despite its name, HPNS's performance is not nearly as good as BPX's.
INTERLNK InterLink TCP/IP.
IUCV IBM TCP/IP IUCV (Inter User Communication Vehicle).
IPV6 only IBMV6 Auto-detect the "best" IBM TCP/IP interface. For z/OS, this is BPXV6.

This option is available as of version 7.7 of Model 204.

BPXV6 IBM BPX (Unix System Services).

This option is available as of version 7.7 of Model 204.

CMS IPV4 only IBM Auto-detect the "best" IBM TCP/IP interface. For CMS, this is IUCV.
IUCV IBM TCP/IP IUCV (Inter User Communication Vehicle).
IPV6 only IBMV6 Auto-detect the "best" IBM TCP/IP interface. For CMS, this is IUCVV6.

This option is available as of version 7.7 of Model 204.

IUCVV6 IBM TCP/IP IUCV (Inter User Communication Vehicle).

This option is available as of version 7.7 of Model 204.

z/VSE IPV4 only CSI Connectivity Systems TCP/IP.

Most of the communication with the TCP/IP address space is accomplished with a Pseudo subtask (PST). Because of this, you may need to increase the NSUBTKS parameter by 1 before using Janus.