Ethernet Adapter Installation and Support Guide

Introduction to the Ethernet 4 ServerNet Adapter
(E4SA)
Ethernet Adapter Installation and Support Guide—425684-003
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E4SA System Connections
E4SA System Connections
An E4SA has three primary, dual-ported system connections, as follows:
•
Data transfer interface (ServerNet)
•
Diagnostics subsystem interface (Serial Maintenance Bus)
•
Power interface
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 four 10baseT RJ-45 ports on the front of the
customer-replaceable unit (CRU). The E4SA supports Ethernet 802.3 and provides the
following features:
•
Performance of MAC layer functions of Ethernet and IEEE 802.3
•
Performance of framing functions
•
Full collision support
•
Bit rates up to 10 megabits per second (Mbps)
•
Reception of back-to-back frames
•
Detection of received frames that are too long
•
Multibuffer data structure
•
Support of 48-bit addresses in physical, logical, and unchecked modes
•
Heartbeat indication
•
Transmitter network management and diagnostics
•
Receiver network management and diagnostics
•
Error counters (discarded frames, CRC errors, and alignment errors)
•
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:
•
Powering the adapter on or off
•
Identifying the type, configuration, and revision of the adapter
•
Running scan diagnostics IEEE 1149.1 (JTAG) on JTAG components