Fast Ethernet Adapter Installation and Support Guide

Introduction to the Fast Ethernet ServerNet Adapter
(FESA)
Fast Ethernet Adapter Installation and Support Guide—425685-003
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Data Transfer Interface (ServerNet)
Data Transfer Interface (ServerNet)
The data transfer interface consists of ports for the X-fabric and Y-fabric. The ports
attach to an internal router that connects to the two SACs on the adapter. The router
provides dual-ported ServerNet access to each SAC. The SACs provide an interface
between the ServerNet fabrics and the 100baseT RJ-45 port on the front of the FESA.
The FESA supports Ethernet 802.3u and provides the following features:
•
Performance of MAC layer functions of Ethernet and IEEE 802.3
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Performance of framing functions
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Full collision support
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Bit rates up to 10 megabits per second (Mbps)
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Reception of back-to-back frames
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Detection of received frames that are too long
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Multibuffer data structure
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Support of 48-bit addresses in physical, logical, and unchecked modes
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Heartbeat indication
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Transmitter network management and diagnostics
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Receiver network management and diagnostics
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Error counters (discarded frames, CRC errors, and alignment errors)
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Internal and external loopback mode
Diagnostic Subsystem Interface (Serial Maintenance Bus)
The diagnostics subsystem interface is supported by the serial maintenance bus
(SMB). The maintenance subsystem contains the circuitry required to meet the
maintenance system requirements of an active-logic CRU, which includes
•
Dual-multiplexed SMB ports
•
An MROUTER, which provides redundant access to the maintenance-system
features of the CRU. The maintenance and diagnostic system provide the following
capabilities:
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Powering the adapter on or off
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Identifying the type, configuration, and revision of the adapter
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Running scan diagnostics IEEE 1149.1 (JTAG) on JTAG components
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Initializing the adapter for access to or from the ServerNet
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Controlling the adapter’s standard LEDs
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A serial EEPROM (SEEROM) that provides the following:
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Hardware identification (part number and revision)
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Manufacturing tracking (serial) number
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MAC addresses
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CRU visual indicators