SNAX/XF and SNAX/APN Configuration and Management Manual

Configuring for Token-Ring Support
SNAX/XF and SNAX/APN Configuration and Management Manual—425836-006
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Remote PU Attributes With Token-Ring Specific
Values
LAN Activity
The PU attributes, LNT1, LNT2, and LNTI may be used to monitor activity on the ring.
Depending upon the traffic pattern and types of applications running on your Token-
Ring LAN, you may want to optimize these values. For example, if there is heavy
activity on the ring and responses from the remote station take more than one second,
you might want to increase LNT1 to prevent a second request for acknowledgment
being issued—because unnecessary requests further add to the problems on a busy
ring.
LNT1 is the Reply Timer. This timer is used to detect the lack of a required response
from a remote station.
LNT2 is the Receiver Acknowledgment Timer. This timer is used to delay sending
acknowledgments. When the LNT2 timer expires, an acknowledgment to previously
received frames is sent.
LNTI is the Inactivity Timer. A link station can use LNTI to detect an inoperative
condition in either the remote link station or in the transmission medium.
Remote PU Attributes With Token-Ring Specific Values
ADDRESS is a required PU attribute for SNAX/APN, but for Token-Ring, it does not
specify the address of the remote node (that is done by LNRMTADDR). For Token-
Ring, PU ADDRESS is used internally by SNAX/APN and its value must be unique to
the line.
The PU RECSIZE attribute used in the SCF ADD and ALTER commands has unique
values for Token-Ring.
For descriptions of these attributes, see Section 14, Attributes for SNAX/XF and
SNAX/APN.
Configuration Example
SNAX does not directly control the Token-Ring ServerNet adapter (TRSA). SNAX
communicates with the port access method (PAM) message interface, which provides
an LLC2 port for Token-Ring communications. The PAM process uses services
provided by the ServerNet LAN systems access (SLSA) subsystem. SLSA is used to
configure and control the TRSA.
In order to get from the hardware to the eventual application program you must provide
configuration information to these various subsytems. The recommended route through
the levels of the system is:

Configure the ADAPTER, SAC, PIF, and LIF to SLSA

Configure the use of PAM for SNAX

Configure the LINE, PU and LU to SNAX/XF or SNAX/APN