Token-Ring Adapter Installation and Support Guide

Introduction to the Token-Ring SeverNet Adapter
(TRSA)
Token-Ring Adapter Installation and Support Guide—426955-001
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TRSA System Connections
TRSA System Connections
The TRSA has three primary connections:
•
Data transfer interface
•
Diagnostic interface
•
Power interface
Data Transfer Interface
The TRSA provides two supported interfaces: one to ServerNet and one to Token Ring.
The TRSA is attached to the ServerNet System Area Network (SAN) and provides a
connection to a Token-Ring LAN. ServerNet is a full-duplex, parallel bus that transfers
data and commands between endpoints at a 50-Mbyte rate. Physically, ServerNet is a
point-to-point connection consisting of two 9-bit buses and a 50MHz clock for each bus.
Each bus is unidirectional. The buses, known as X and Y fabrics, are duplicated for
redundancy,
The Token-Ring data transfer interface consists of ports for the X and Y fabrics. The
ports attach to a single ServerNet addressable controller (SAC).
Diagnostic Subsystem Interface (Serial Maintenance Bus)
The maintenance subsystem contains the circuitry required to meet the maintenance-
system requirements of an active-logic CRU. It is the maintenance subsystem which
provides the Maintenance and Diagnostic System (MDS) with the following
capabilities:
•
Powering the adapter on and off
•
Identifying the type, configuration, and revision of the adapter
•
Running scan diagnostics on JTAG components.
•
Initializing the adapter for access to or from the ServerNet
•
Controlling the adapter’s standard LEDs
The maintenance subsystem includes:
•
Two serial buses that have been multiplexed to form a single serial maintenance bus
(SMB).
•
An MROUTER, which provides redundant access to the maintenance-system
features of the CRU. The maintenance and diagnostic system provides the following
capabilities:
•
A serial EEPROM (SEEROM) that provides:
•
Hardware identification (part number and revision)
•
Manufacturing tracking (serial) number.