Token-Ring Adapter Installation and Support Guide

Introduction to the Token-Ring SeverNet Adapter
(TRSA)
Token-Ring Adapter Installation and Support Guide—426955-001
1-6
Power Interface
•
CRU visual indicators
•
Power control to the TRSA.
Power Interface
The TRSA receives power through a shielded high-density, metric connector module.
The connector module consists of two 72-in block and a blade power block.
Relationship to the SLSA Subsystem
The ServerNet LAN Systems Access (SLSA) subsystem supports parallel I/O to LANs
linked to the ServerNet SAN. Thus, multiple LANs, using different protocols can all
access the processors (NonStop™ Himalaya S-series servers) attached to the ServerNet.
For example, TCP/IP, IPX/SPX, Expand, and SNA (Token-Ring) protocols may all be
communicating through the SAN, all simultaneously performing I/O with the processors
attached to the SAN.
The application process using the Token-Ring protocol, most probably SNAX/TR,
communicates with the port access method (PAM) process through a message system
interface (MSAP). The PAM process communicates with SLSA through a logical
interface (LIF). There is also a physical interface (PIF).
SNAX does not directly control the TRSA. SNAX communicates with the PAM
message interface, which provides an LLC2 port interface for token-ring
communications. The PAM process uses services provided by the SLSA subsystem.
SLSA is used to configure and control the TRSA.