MEDIUM

For LAN and ATM LAN emulation, connections:
>>-MEDIUM--=--+-BOXMGR-+--------------------------------------->< +-CSMACD-+ +-FDDI---+ '-RING---'
statements:	PORT
dependencies:	ADAPNO, CUADDR

For ATM native connections:
.-MEDIUM--=--ATM-. >>-+----------------+------------------------------------------>< '-MEDIUM--=--ATM-'
statements:	PORT
dependency:	PORTNAME

For Enterprise Extender connections:
>>-MEDIUM--=--HPRIP--------------------------------------------><
statements:	PORT
dependency:	DIAL=YES

Identifies the type of shared access transport facility (SATF) being defined.

For LAN and ATM LAN emulation connections, this operand is required and the valid values are RING, CSMACD, FDDI, and BOXMGR.

For Enterprise Extender connections, the only valid option is HPRIP.

For ATM native connections, ATM is the only valid value and is the default value.

MEDIUM=ATM

Defines a connection that provides native access to an ATM network through an Open Systems Adapter.

MEDIUM=BOXMGR

Defines a box manager. A box manager allows an IBM® 3172 Nways Interconnect Controller or an Open Systems Adapter to have minimal network management. It also allows generic alerts to flow from an IBM 3172 Nways Interconnect Controller or an Open Systems Adapter to the NetView® program.

The IBM 3172 Nways interconnect controller tries to maintain continuous availability of the SSCP-PU session when there is an external communication adapter major node configured for network management (MEDIUM=BOXMGR). The BOXMGR session ends only when either VTAM® terminates or the last external communication major node associated with the IBM 3172 Nways interconnect controller comes down. If the connection is terminated for any other reason, the IBM 3172 Nways interconnect controller attempts to reestablish the connection.

MEDIUM=BOXMGR sets MEDIUM=RING and ADAPNO=255 on the PORT definition statement. It also sets DIAL=YES on the GROUP definition statement and sets CUADDR to the value you specify on this PORT definition statement.

When MEDIUM=BOXMGR, only one GROUP, LINE, and PU definition statement is allowed. Also, the only operands that can be coded for this value are ISTATUS and SPAN. ISTATUS and SPAN are optional.

The MACADDR value for this option is specified on the DIALNO operand of the PATH definition statement of the switched major node.

Note: Because there are no LUs in the external communication adapter major node, there should be no LU definition statements in the switched major node. If there are LU definition statements under the PATH definition statement, errors occur when you attempt to activate the LUs.

See z/OS Communications Server: SNA Network Implementation Guide for an example of coding a box manager definition.

MEDIUM=CSMACD

Defines a connection to a CSMA/CD 802.3 LAN

MEDIUM=FDDI

Defines a connection to a FDDI LAN

MEDIUM=HPRIP

Defines a connection that provides access to resources located through an IP network through Enterprise Extender.

Note: On the PORT statement, only one XCA major node with MEDIUM=HPRIP may be active at any time.

MEDIUM=RING

Defines a connection to a token-ring network