Digital Equipment EtherWORKS Switch 6T/2TX User manual

EtherWORKSSwitch6T/2TX
Installation
Part Number: EK–DEL6X–IN. A01
This document describes how to install and operate the EtherWORKS
Switch 6T/2TX.
Revision/Update Information: This is a new manual.
Digital Equipment Corporation
Maynard, Massachusetts

August 1996
Digital Equipment Corporation makes no representations that the use of its products in the manner described in this
publication will not infringe on existing or future patent rights, nor do the descriptions contained in this publication
imply the granting of licenses to make, use, or sell equipment or software in accordance with the description.
Possession, use, or copying of the software described in this publication is authorized only pursuant to a valid
written license from Digital or an authorized sublicensor.
© Digital Equipment Corporation 1996. All rights reserved.
The following are trademarks of Digital Equipment Corporation: DECnet, Digital, Digital UNIX, EtherWORKS,
OpenVMS, PATHWORKS, ThinWire, and the DIGITAL logo.
Banyan and Vines are registered trademarks of Banyan Systems, Inc.
CompuServe is a registered trademark of CompuServe, Inc
IBM and PowerPC are registered trademarks of International Business Machines Corporation.
IEEE is a registered trademark of the Institute of Electrical and Electronics Engineers, Inc.
Intel is a registered trademark of Intel Corporation.
SCO, OpenServer, and UnixWare are trademarks or registered trademarks of The Santa Cruz Operation, Inc.
NetWare is a registered trademark of Novell, Inc.
Windows NT and Windows for Workgroups are trademarks and Microsoft, MS-DOS, Windows, and Windows 95
are registered trademarks of Microsoft Corporation.
Xerox is a registered trademark of Xerox Corporation.
All other trademarks and registered trademarks are the property of their respective holders.
FCC Class A Certification
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instruction manual, may cause harmful interference to
radio communications.
Any changes or modifications made to this equipment may void the user’s authority to
operate this equipment.

Operation of this equipment in a residential area may cause interference in which case the
user at his own expense will be required to take whatever measures may be required to
correct the interference.
VCCI Class I Compliance
( V C C I )
This product complies with CISPR 22 Class A, UL, and is eligible to bear the CE Mark
label.

v
Table of Contents
Preface
About This Manual ......................................................................................................................................ix
Conventions.................................................................................................................................................ix
Package Contents..........................................................................................................................................x
Quick Installation.........................................................................................................................................xi
1 Introduction
Overview of Switching Technology ..........................................................................................................1–1
EtherWORKS Switch 6T/2TX ..................................................................................................................1–2
Features.....................................................................................................................................................1–2
2 Hardware Description
Overview ..................................................................................................................................................2–1
Indicator Panel..........................................................................................................................................2–1
Configure Button................................................................................................................................2–2
LEDs..................................................................................................................................................2–3
CPU LED (Power)..............................................................................................................................2–3
Port Status Display Mode (Status).............................................................................................................2–3
Collision Ratio (Collision%) ..............................................................................................................2–4
Transmit Status ..................................................................................................................................2–4
Receive Status....................................................................................................................................2–5
Select/Link Status...............................................................................................................................2–5
Statistical Display for System Performance...............................................................................................2–5
Port Utilization Rate (Util%)..............................................................................................................2–6
Port Forwarding Ratio (Forward%).....................................................................................................2–6
Port Filtering Ratio (Filter%)..............................................................................................................2–6
Demonstration Display Mode (Demo).......................................................................................................2–7
Diagnostics Display Mode (DIAG)............................................................................................................2–7
System Diagnostic Test......................................................................................................................2–7
Port Diagnostic Test...........................................................................................................................2–8
Full– and Half–Duplex Communication Setting (Full/Half).......................................................................2–8
Ethernet Ports............................................................................................................................................2–8
8-Pin MJ Ports....................................................................................................................................2–9
Combo Port 6.....................................................................................................................................2–9
Power Socket ..........................................................................................................................................2–10

vi
3 Hardware Installation
Overview...................................................................................................................................................3–1
Preinstallation Requirements.....................................................................................................................3–1
Hardware Installation................................................................................................................................3–2
Stacking the DEL6X Without a Rack .................................................................................................3–2
Mounting the DEL6X in a Rack .........................................................................................................3–3
Connecting the DEL6X System.................................................................................................................3–3
Connecting to a PC, Server, or Workstation........................................................................................3–3
Connecting to Another Network Interconnection Device....................................................................3–4
Connecting to a Trunk Line................................................................................................................3–6
Providing Power to the DEL6X.................................................................................................................3–6
Verifying System Operation......................................................................................................................3–7
4 Setup and Configuration
Overview...................................................................................................................................................4–1
Diagnostic Tests........................................................................................................................................4–1
Setting the Display Mode..........................................................................................................................4–2
Port Status Display.............................................................................................................................4–2
Bandwidth Utilization ........................................................................................................................4–2
Packet Forwarding Ratio ....................................................................................................................4–2
Packet Filtering Ratio.........................................................................................................................4–2
Demonstration Function .....................................................................................................................4–2
Diagnostic Function............................................................................................................................4–3
Full–/Half–Duplex Mode Selection ....................................................................................................4–3
5 Applications
Overview...................................................................................................................................................5–1
Multiport Bridge with High
²
Bandwidth Backbone....................................................................................5–1
High
²
Bandwidth File Server.....................................................................................................................5–3
High-Speed Link Between Switches..........................................................................................................5–4
Overview..................................................................................................................................................A–1
Diagnosing DEL6X LEDs........................................................................................................................A–1
System Diagnostics..................................................................................................................................A–2
Installation ........................................................................................................................................A–2
Cabling..............................................................................................................................................A–2
External Adapters..............................................................................................................................A–2
Configuration....................................................................................................................................A–3
DEL6X Integrity ...............................................................................................................................A–3
Overview.................................................................................................................................................. B–1
Physical Description................................................................................................................................. B–1
Conformance............................................................................................................................................ B–1
Operating Environment Specifications ..................................................................................................... B–2
Bridging Criteria...................................................................................................................................... B–2
Acoustical Specifications ......................................................................................................................... B–3
Connector Pin Assignments...................................................................................................................... B–4
8–Pin MJ Port.................................................................................................................................... B–4
AUI Port............................................................................................................................................ B–5

vii
Other Digital Network Adapter Products.................................................................................................. B–6
DE45X–AR Remote Boot ROM........................................................................................................ B–6
DE20M–AR Remote Boot ROM....................................................................................................... B–6
EtherWORKS Switch 2TTX (DEL2X).............................................................................................. B–6
EtherWORKS Hub 8TX (DELXR) Repeater..................................................................................... B–7
Fast EtherWORKS PCI 10/100 Adapter ............................................................................................ B–7
EtherWORKS Turbo PCI 10 Adapter................................................................................................ B–7
EtherWORKS 3 Turbo Adapter......................................................................................................... B–8
EtherWORKS Turbo EISA Adapter .................................................................................................. B–8
EtherWORKS PCMCIA Turbo Adapter ............................................................................................ B–8
DEC FDDIcontroller/PCI Adapter..................................................................................................... B–8
DEC FDDIcontroller/EISA Adapter .................................................................................................. B–9
Ordering Information ............................................................................................................................... B–9

ix
Preface
About This Manual
This guide is designed for the experienced network installer. It describes how to install and
operate Digital’s EtherWORKS Switch 6T/2TX (DEL6X) switch (also referred to as the
DEL6X or switch).
Conventions
The following conventions are used in this manual:
Convention Description
Note Contains information of special importance.
Italics In examples, indicates a variable. In text, emphasizes a
term or indicates a book title.
Monospaced type Indicates a literal example of system output.

x
Package Contents
The EtherWORKS Switch 6T/2TX package contains the items in the following list and shown
in the following figure:
• The EtherWORKS Switch 6T/2TX 
• An ac power cord 
• This installation guide 
• Four rubber feet 
LJ-5111.AI4
EtherWORKS 6T/2TX
2
Configure
CPU
Util%
Forward%
Filter%
Demo
Full/Half
Diag
Ethernet
Status
%
Collision%
30
20
10
5
1
Transmit
Receive
Full Duplex
Select/Link
10 Base-T 100 Base-TX
90
70
50
35
20
10
5
1
%
1238
7
6
5
4
// or X
1x 2x 3x
4x 5x
6x
1
34

xi
Quick Installation
The EtherWORKS Switch 6T/2TX contains five 8 ² pin MJ 10 Mb/s Ethernet ports, one
multimedia 10 Mb/s port, and two 8 ² pin MJ 100 Mb/s ports for Fast Ethernet connection.
Each 8 ² pin MJ port supports full ² and half ² duplex operation. The smart design built into the
front display panel and configuration options provides a friendly interface that simplifies
installation and network troubleshooting.
Use the following procedure to install the DEL6X:
1. Unpack the DEL6X.
2. Choose a location close to the network device you need to connect, and within easy reach
of an electrical outlet.
3. Install the DEL6X on a desktop or mount it in a rack.
4. Connect PCs, servers, or workstations to the 8 ² pin MJ station ports.
5. Connect to another switch or compatible hub using one of the daisy ² chain ports (Port 1
for 10 Mb/s, Port 7 or 8 for 100 Mb/s), or to an Ethernet or fiber ² optic trunk using the
AUI or BNC backbone port.
You may also use the DEL6X as a collapsed backbone or connect to a collapsed
backbone using one of the 10 Mb/s Ethernet ports or 100 Mb/s Fast Ethernet ports.
(Refer to Chapter 5 for sample applications.)
6. Set the transmission mode for each port to full ² or half ² duplex operation.
7. Verify network communications by ensuring the following:
• You have made all the necessary connections.
• You can access any connected resources.
• The DEL6X LEDs are functioning properly.
If you encounter any problems installing the DEL6X, refer to Chapter 3 for a detailed
description of installation procedures, or to Appendix A for troubleshooting help.

1–1
1
Introduction
Overview of Switching Technology
The Ethernet switch allows simultaneous transmission of multiple packets using an internal
high–speed data channel. This means that it can partition a network more efficiently than
bridges or routers in most environments. Therefore, the Ethernet switch is recognized as one
of the most important building blocks for today’s networking technology.
The learning function in the switching hub stores the address and corresponding port number
of each incoming and outgoing packet in a routing table. This information is subsequently
used to filter packets whose destination address is on the same segment as the resource
address.
The switch scans the destination address from the packet header, searches the routing table
provided for the incoming port, then forwards the packet only if required, often before fully
received. This fast forwarding makes the switch attractive for connecting servers directly to
the network, thereby increasing throughput and availability. However, the switch is most
commonly used to segment existing hubs, which usually improves overall performance. A
switching hub can be easily configured in any Ethernet network to significantly boost
bandwidth using conventional cabling and adapters.

Introduction
1–2
EtherWORKS Switch 6T/2TX
The DEL6X can boost bandwidth. It provides five 10 Mb/s 8–pin MJ station ports and one 10
Mb/s TP/AUI/BNC combination (combo) port to connect to either a subnetwork, or directly
to a PC, server, or key workstation, and two 8–pin 100 Mb/s Fast Ethernet ports for
connection to a backbone or server. In addition to partitioning an overloaded network, the
DEL6X provides connection between legacy 10Base–T networks and the newer generation
100Base–TX. It can be configured to operate in either full–duplex or half–duplex data
transfer mode to support the interconnection requirements of other high–speed devices.
The switching fabric of the DEL6X incorporates a nonblocking crossbar matrix that allows
simultaneous transport of multiple packets across the switch (that is, up to eight switching
paths can be established at the same time, with each path crossing two ports). The DEL6X
performs “on-the-fly” cut–through switching, which sends a packet to the appropriate port
according to the destination address scanned from the packet header. This technique reduces
the latency of packet transmission to 20 microseconds or less. Compared to approximately
800 microseconds for a bridge or 1800 microseconds for a router, both of which have to store
the entire packet before it can be forwarded, the DEL6X can deliver a quantum improvement
to network performance.
As a device functioning on the media access control (MAC) layer, the DEL6X is protocol
independent, and therefore compatible with IEEE 802.3, IEEE 802.3u, TCP/IP, NetWare,
DECnet, and XNS protocols. The DEL6X can be configured as a standalone device to form a
work group consisting of two to eight subnetworks or workstations; it can function as a
simple twisted–pair LAN; or it can serve as a multiport bridge. With its low port–to–port
latency and extremely high–forwarding efficiency, the DEL6X can also be connected to other
switches or compatible hubs.
To install the DEL6X, use your current network infrastructure, including wiring and network
interface cards (NICs). Afterwards, you can configure and monitor the system using the
DEL6X front panel, which includes an extensive array of LEDs for monitoring the unit's
overall condition, as well as the status of each port.
Features
The main features of the DEL6X are as follows:
• Five independent 8–pin MJ 10 Mb/s Ethernet ports
• One TP/AUI/BNC combo 10 Mb/s Ethernet port
• Two 8-pin MJ 100 Mb/s Fast Ethernet ports
• Supports cascaded switches using the daisy-chain switch to convert
Port 1 (10 Mb/s) or Ports 7 and 8 (100 Mb/s) to a daisy–chain port
• Automatic media detection for the combo port
• Supports both full–duplex and half–duplex operation for all ports
• Total bandwidth of up to 260 Mb/s (when full–duplex mode is used)

Introduction
1–3
• Uses “on the fly” cut–through switching technique to transport packets
• Minimum latency of packet transmission (leading edge to leading edge) of
less than 20 microseconds when using cut–through switching
• Supports transparent bridging function
• Operates at maximum packet filtering and forwarding rate
• Provides a 64 KB buffer for each 10 Mb/s port, and a 160K buffer for each
100 Mb/s port
• Routing table contains 4K entries per port to store MAC address for attached network
nodes
• Provides address learning function to build the routing information database
• Uses fast hashing scheme to retrieve information from routing table when making routing
decisions
• Provides frame filtering and forwarding functions for each port, which are capable of
filtering and forwarding 100% of all Ethernet packets at a rate of 14,880 packets per
second for the 10 Mb/s ports and 148,800 for the 100 Mb/s ports
• Nonblocking crossbar switching matrix allows concurrent operation of up to eight
Ethernet segments
• Microprocessor–based design to monitor network utilization, collisions, link, and port
partition status
• A LED indicator panel for monitoring overall switching condition and
individual port status
• Port utilization equalizer display
• Automatic polarity detection and correction permits automatic adjustment for wiring errors
• Conforms to the IEEE 802.3 and IEEE 802.3u specifications (10Base–Tand 100Base–TX
standards)
• Flexible installation for desktop or rack mount

2–1
2
Hardware Description
Overview
This chapter describes the hardware features of the EtherWORKS Switch 6T/2TX. For easier
management of the switch, familiarize yourself with the front panel display LEDs, ports, and
daisy-chain switches shown in the following illustrations and described in the following
sections.
Indicator Panel
The front panel on the DEL6X (shown in the following figure) provides a simple interface for
configuring or monitoring the switch. It includes a Configure button  , power and display
mode LEDs  , 10Base ² T statistical display mode LEDs  , and 100Base ² TX statistical
display mode LEDs  .
Ethernet
EtherWORKS 6T/2TX
Status
Util% Forward% Filter% Demo Diag Full/Half
Configure
CPU
Transmit
Receive
Full Duplex
Select/Link
Collision%
%
30
20
10
5
1
90
70
50
35
20
10
5
1
%
10Base-T 100Base-TX
12345678
123 4
LJ-5112.AI4

Hardware Description
2–2
Configure Button
The Configure button, located on the left of the front panel (  in the following figure), is
used to select the following configuration functions:
• Port status (displays status of ports during normal operation)
• System performance (displays relative bandwidth utilization rate, forwarding ratio,
or filtering ratio for each port)
• Demonstration (verifies that all LEDs are functioning properly)
• Diagnostics (tests the status of various system components)
• Full– and half–duplex mode (sets port communication to full–duplex or half–duplex
operations)
To set system performance or diagnostic mode, use the following procedures:
______________________________ Note ____________________________
The term “long press” means to press the Configure button for more than 2
seconds, then release it. The term “short press” means to press the Configure
button, then immediately release it. If the Configure button is not pressed within
10 seconds, the system returns to normal operation.
_______________________________________________________________
1. To start the configuration, use a long press on the Configure button. The LEDs will
light to show the selected configuration function. (Refer to the related sections in this
chapter and in Chapter 4 for complete details.)
2. To scan through the configuration functions, use a short press on the Configure
button. (Refer to Chapter 4 for information on how to select full– and half–duplex
communications.)
3. To accept and implement the current settings, use a long press on the Configure
button.

Hardware Description
2–3
LEDs The LEDs shown in the following figure indicate:
• The unit is receiving power and the CPU is running 
• The current display mode 
• The statistical display for system performance 
• The demonstration, diagnostics, and full
²
and half
²
duplex display modes 
LJ-5114.AI4
Ethernet
Status
Util% Forward% Filter% Demo Diag Full/Half
Configure
CPU
%
14 5
2 3
CPU LED (Power)
The CPU LED indicates the conditions described in the following table:
LED Activity Condition Indication
Blinking light ON Unit is receiving power, CPU is running
No light OFF Power is disconnected, no power received
Port Status Display Mode (Status)
The port status display LED (  in the previous figure) shows the port status for the DEL6X.
When this LED lights (see the following table), the port status display LEDs (shown in the
next figure) provide the information described in the following sections:
LED Activity Condition Indication
Steady light ON Port status display mode is active
No light OFF Port status display is inactive

Hardware Description
2–4
Transmit
Receive
Full Duplex
Select/Link
Collision%
30
20
10
5
1
90
70
50
35
20
10
5
1
%
10Base-T 100Base-TX
12345678
LJ-5343.AI4
Collision Ratio (Collision%)
Collisions occur when two or more devices connected to a DEL6X attempt to transmit data
simultaneously on the network. When a collision occurs, the devices pause, then retransmit
after a pseudo ² random wait period. Because wait periods differ among devices, successive
collisions become increasingly improbable.
The collision LEDs assist the network manager in monitoring the percentage of packet
collisions occurring relative to the total packets transmitted by each port. The collision LEDs
are labeled by row to indicate the percentage of collisions encountered by the corresponding
port. When collisions reach a level marked on the LED display, the corresponding LED
lights. For example, if packet collision reaches 1%, the LED labeled 1% will light. However,
if collisions go beyond 30%, the LED labeled 30% and all the other LEDs before it (1, 5, 10,
and 20) also light in rapid succession (see the previous figure and the following table).
Label% Color
30% Red
20% Amber
10% Amber
5% Green
1% Green
Transmit Status
The following table describes the Transmit status LEDs when outgoing traffic exits the port:
LED Activity Condition Indication
Blinking light ON Port is transmitting packets; frequency of blinking
is proportional to the traffic passing through the
port
No light OFF No packets are being transmitted from this port

Hardware Description
2–5
Receive Status
The following table describes the Receive status LEDs when incoming traffic enters the port:
LED Activity Condition Indication
Blinking light ON Port is receiving packets; frequency of
blinking is proportional to the traffic passing
through the port
No light OFF No packets are being received on this port
Select/Link Status
The following table describes the Select/Link status LEDs during a valid network connection
associated with the port:
LED Activity Condition Indication
Steady light ON Valid link has been established on this port
No light OFF No valid link has been established on this port
_____________________________ Note____________________________
If the Select/Link LED does not light when a device is connected to its
corresponding port, make sure that both the DEL6X and the connected device are
powered on. For devices connected to the DEL6X using twisted–pair cable, make
sure that the cable length does not exceed 100 meters. Use standard, straight–
through cables. Do not use crossover or other specialized cables.
______________________________________________________________
Statistical Display for System Performance
The statistical display LEDs (shown in the previous figure) indicate a functional value for
each port, depending on the selected display mode. (Refer to the previous Configure Button
section for information on setting the display mode.) These LEDs are described in the
following table and sections:
Label (%) Color
90% Red
70% Amber
50% Amber
35% Green
20% Green
10% Green
5% Green
1% Green

Hardware Description
2–6
Port Utilization Rate (Util%)
These LEDs show the percentage of valid data transmitted over the complete network
bandwidth (updated every 0.5 seconds). There are eight LEDs representing the percentage of
network utilization. The corresponding LEDs light to show that the utilization of LAN
bandwidth has reached this percentage (see the following table). When active, these LEDs
function similar to a stereo system's equalizer display.
For example, if network utilization reaches 1%, the LED labeled 1% will light. However, if
network utilization rises above 1% (for example, 35%), the LED labeled 35% and all the
other LEDs before it (1, 5, 10, and 20) will also light in rapid succession. These LEDs
monitor the share of valid network frames handled by each port within a 10 Mb/s or 100 Mb/s
bandwidth, depending on the port. The LEDs provide a quick way to monitor the current
traffic load relative to the network's capacity.
LED Activity Condition Indication
Steady light ON Port utilization display mode is active
No light OFF Port utilization display mode is inactive
Port Forwarding Ratio (Forward%)
These LEDs show the percentage of packets that must be forwarded by bridging hardware to
the other port on the DEL6X, that is, another LAN segment or connected workstation (see the
following table). When viewing these LEDs, remember that under normal conditions, the
DEL6X forwards all Ethernet packets that must be transferred among the connected LAN
segments at full line speed.
LED Activity Condition Indication
Steady light ON Port forward display mode is active
No light OFF Port forward display mode is inactive
Port Filtering Ratio (Filter%)
These LEDs show the percentage of packets that must be filtered from the DEL6X by
bridging hardware because the destination address is on the same segment connected to the
receiving port. When viewing these LEDs, remember that under normal conditions, the
DEL6X filters all Ethernet packets that belong to the local LAN segments at full line speed
(see the following table).
LED Activity Condition Indication
Steady light ON Port filtering display mode is active
No light OFF Port filtering display mode is inactive

Hardware Description
2–7
Demonstration Display Mode (Demo)
When this function is enabled (see the following table), the system cycles through all the
DEL6X LEDs to verify that the LEDs are functioning. The LEDs will continue to light until
the Demo function is disabled.
LED Activity Condition Indication
Steady light ON Demonstration function is enabled
No light OFF Demonstration function is inactive
Diagnostics Display Mode (DIAG)
When this function is enabled, the diagnostic display mode indicates that the system is in
diagnostic mode. (Refer to the previous Configure Button section for information on setting
the display mode.)
After powerup, the DEL6X automatically performs a self–diagnostic test. This test is done in
two stages: the first stage is the system diagnostic test; the second stage is the port diagnostic
test. If a problem is detected, the current diagnostic process (system or port test) will continue
until completed. If the test does not complete successfully, the corresponding LEDs
(described in the following table and sections) will flash after test completion to indicate
which component failed the test.
_____________________________ Note____________________________
Enabling the Diagnostic function activates tests similar to the one performed upon
powerup. After successfully completing diagnostics, the system returns to normal
operation.
______________________________________________________________
System Diagnostic Test
The following table describes the system–level failures and corresponding LEDs. If a
problem is detected, failure indications will appear in Row 9.
LED (Column, Row) Color Component Tested
1, 9 Red System ROM
2, 9 Red System RAM
3, 9 Red System EEPROM

Hardware Description
2–8
Port Diagnostic Test
The port diagnostic test checks all ports. If a problem is detected, the LEDs in the
corresponding column (indicating the malfunctioning port) and row (indicating the failed
component) will light as shown in the following table:
LED (Row) Color Diagnostic Test Status
5 Green Failed Output Queue RAM Test
6 Green Failed Input Queue RAM Test
7 Amber Failed Routing Table Test
8 Amber Failed Port IC Testt
Full– and Half–Duplex Communication Setting (Full/Half)
The communication mode can be set to either full–duplex or half–duplex operation. The LED
for the corresponding port in the LED row labeled Full–Duplex should be set as indicated in
the following table. The LED row labeled Select is used in conjunction with the Full/Half
LED to specify the current port to configure. (Refer to Chapter 4 for information on setting
the communication mode.)
LED Activity Condition Indication
Steady light ON Port is set for full–duplex operation
No light OFF Port is set for half–duplex operation
The DEL6X supports full–duplex mode for all ports except the BNC port. If you use
full–duplex for the AUI port when connecting to a fiber–optic backbone, be sure that your
external transceiver (for example, a MAU) supports full–duplex operation.
Full–duplex operation applies only to point–to–point access (for example, when attaching the
DEL6X to a PC, workstation, server, or another switch). Repeater hubs use a common
collision domain for all communications, and therefore cannot support full–duplex mode.
When connecting the DEL6X to a repeater hub, use a standard cascaded connection set for
half–duplex communications.
Ethernet Ports
The DEL6X includes five 10 Mb/s Ethernet ports, one combo 10 Mb/s Ethernet port, and two
100 Mb/s Fast Ethernet ports. These ports are shown in the following figures and described in
the following sections.