SMC 5912DS,5924DS,5912,5924 User guide
TigerStack II 10/100
12- and 24-Port 10/100 Mbps Hubs
u
Forms a stack with up to 144 ports
u
Manageable via SNMP and RMON
u
10/100BASE-TX and 100BASE-FX extension modules
u
Support for redundant power unit
User Guide
SMC5912DS
SMC5924DS
SMC5912
SMC5924
TigerStack II 10/100
User Guide
From SMC’s Tiger line of feature-rich workgroup LAN solutions
6 Hughes
Irvine, CA 92618
Phone: (949) 707-2400
May 1999
Pub. # 150914-101 R02
Information furnished by SMC Networks, Inc. (SMC) is believed to
be accurate and reliable. However, no responsibility is assumed by
SMC for its use, nor for any infringements of patents or other rights
of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of
SMC. SMC reserves the right to change specifications at any time
without notice.
Copyright © 1999 by
SMC Networks, Inc.
6 Hughes
Irvine, CA 92618
All rights reserved. Printed in Taiwan
Trademarks:
SMC is a registered trademark; and EZ Switch, TigerStack and TigerSwitch are trademarks of
SMC Networks, Inc. Other product and company names are trademarks or registered trademarks of their respective holders.
Limited Warranty
HARDWARE: SMC Networks, Inc. (“SMC”) warrants its TigerStack II 10/100
Hubs to be free from defects in workmanship and materials, under normal
use and service, for the following lengths of time from the date of purchase
from SMC or its Authorized Reseller:
TigerStack II 10/100 Hubs . . . . . . . . . . . . . . . . . . . . . . . . . . . . Three Years
If a product does not operate as warranted during the applicable warranty
period, SMC shall, at its option and expense, repair the defective product or
part, deliver to Customer an equivalent product or part to replace the
defective item, or refund to Customer the purchase price paid for the
defective product. All products that are replaced will become the property
of SMC. Replacement products may be new or reconditioned. Any replaced
or repaired product or part has a ninety (90) day warranty or the remainder
of the initial warranty period, whichever is longer.
SMC shall not be responsible for any custom software or firmware,
configuration information, or memory data of Customer contained in, stored
on, or integrated with any products returned to SMC pursuant to any
warranty.
SOFTWARE: SMC warrants that the software programs licensed from it will
perform in substantial conformance to the program specifications for a period
of ninety (90) days from the date of purchase from SMC or its Authorized
Reseller. SMC warrants the magnetic media containing software against
failure during the warranty period. No updates are provided. SMC’s sole
obligation hereunder shall be (at SMC’s discretion) to refund the purchase
price paid by Customer for any defective software products or to replace
any defective media with software which substantially conforms to SMC’s
applicable published specifications. Customer assumes responsibility for the
selection of the appropriate applications program and associated reference
materials. SMC makes no warranty that its software products will work in
combination with any hardware or applications software products provided
by third parties, that the operation of the software products will be
uninterrupted or error free, or that all defects in the software products will
be corrected. For any third party products listed in the SMC software
product documentation or specifications as being compatible, SMC will make
reasonable efforts to prove compatibility, except where the noncompatibility is caused by a “bug” or defect in the third party’s product.
STANDARD WARRANTY SERVICE: Standard warranty service for hardware
products may be obtained by delivering the defective product, accompanied
by a copy of the dated proof of purchase, to SMC’s Service Center or to an
Authorized SMC Service Center during the applicable warranty period.
Standard warranty service for software products may be obtained by
telephoning SMC’s Service Center or an Authorized SMC Service Center,
within the warranty period. Products returned to SMC’s Service Center must
be pre-authorized by SMC with a Return Material Authorization (RMA)
number marked on the outside of the package, and sent prepaid, insured,
L
IMITED WARRANTY
and packaged appropriately for safe shipment. The repaired or replaced
item will be shipped to Customer, at SMC’s expense, not later than thirty
(30) days after receipt by SMC.
WARRANTIES EXCLUSIVE: IF AN SMC PRODUCT DOES NOT OPERATE
AS WARRANTED ABOVE, CUSTOMER’S SOLE REMEDY SHALL BE REPAIR,
REPLACEMENT OR REFUND OF THE PURCHASE PRICE PAID, AT SMC’S
OPTION. THE FOREGOING WARRANTIES AND REMEDIES ARE
EXCLUSIVE AND ARE IN LIEU OF ALL OTHER WARRANTIES OR
CONDITIONS, EXPRESS OR IMPLIED, EITHER IN FACT OR BY OPERATION
OF LAW, STATUTORY OR OTHERWISE, INCLUDING WARRANTIES OR
CONDITIONS OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. SMC NEITHER ASSUMES NOR AUTHORIZES ANY OTHER
PERSON TO ASSUME FOR IT ANY OTHER LIABILITY IN CONNECTION
WITH THE SALE, INSTALLATION, MAINTENANCE OR USE OF ITS
PRODUCTS.
SMC SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING
AND EXAMINATION DISCLOSE THE ALLEGED DEFECT IN THE PRODUCT
DOES NOT EXIST OR WAS CAUSED BY CUSTOMER’S OR ANY THIRD
PERSON’S MISUSE, NEGLECT, IMPROPER INSTALLATION OR TESTING,
UNAUTHORIZED ATTEMPTS TO REPAIR, OR ANY OTHER CAUSE BEYOND
THE RANGE OF THE INTENDED USE, OR BY ACCIDENT, FIRE,
LIGHTNING, OR OTHER HAZARD.
LIMITATION OF LIABILITY: IN NO EVENT, WHETHER BASED IN
CONTRACT OR TORT (INCLUDING NEGLIGENCE) SHALL SMC BE LIABLE
FOR INCIDENTAL, CONSEQUENTIAL, INDIRECT, SPECIAL, OR PUNITIVE
DAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE, LOSS OF BUSINESS,
OR OTHER FINANCIAL LOSS ARISING OUT OF OR IN CONNECTION
WITH THE SALE, INSTALLATION, MAINTENANCE, USE, PERFORMANCE,
FAILURE, OR INTERRUPTION OF ITS PRODUCTS, EVEN IF SMC OR ITS
AUTHORIZED RESELLER HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES NOTHING HEREIN SHALL HAVE THE EFFECT OF
LIMITING OR EXCLUDING SMC’S LIABILITY FOR DEATH OR PERSONAL
INJURY CAUSED BY NEGLIGENCE.
Some states do not allow the exclusion of implied warranties or the
limitation of incidental or consequential damages for consumer products, so
the above limitations and exclusions may not apply to you. This warranty
gives you specific legal rights which may vary from state to state. Nothing
in this warranty shall be taken to affect your statutory rights.
SMC Networks, Inc.
6 Hughes
Irvine, CA 92618
TABLE OF CONTENTS
Compliances ............................................................... v
1 About the Hubs ................................................ 1-1
Overview ................................................................................. 1-2
How to Use this Guide ............................................................ 1-5
Twisted-Pair Ports .................................................................... 1-5
Status LEDs .............................................................................. 1-6
Switch Module ......................................................................... 1-7
Optional Network Management Module ................................. 1-8
Optional Extender Modules ..................................................... 1-9
Stacking Connectors .............................................................. 1-12
Optional Redundant Power Unit ........................................... 1-13
Power Supply Receptacles .................................................... 1-13
Features and Benefits ............................................................ 1-14
2 Network Planning ........................................... 2-1
Sample Applications ................................................................ 2-2
Connectivity Rules ................................................................... 2-7
3 Installing the Stack ..........................................3-1
Selecting a Site ........................................................................ 3-2
Equipment Checklist................................................................ 3-3
Mounting.................................................................................. 3-4
Stacking ................................................................................... 3-7
Connecting to a Power Source ................................................ 3-8
4 Making Network Connections ....................... 4-1
Connecting Network Devices ................................................. 4-2
Twisted-Pair Devices ............................................................... 4-2
100BASE-FX Devices............................................................... 4-5
10BASE2 and AUI Connections ............................................... 4-6
i
T
ABLE OF CONTENTS
A Troubleshooting ............................................ A-1
Troubleshooting LED Indicators ............................................... A-2
Power and Cooling Problems ................................................... A-3
B Cables .............................................................. B-1
Specifications ........................................................................... B-2
Twisted-Pair Cable and Pin Assignments ................................. B-3
C Specifications .................................................. C-1
12-Port TigerStack II 10/100 Hubs .......................................... C-2
24-Port TigerStack II 10/100 Hubs .......................................... C-2
All TigerStack II 10/100 Hubs ................................................. C-3
Slide-In Modules ...................................................................... C-5
D Ordering Information .................................... D-1
TigerStack II 10/100 Products and Accessories ...................... D-2
E Glossary........................................................... E-1
Glossary of Terms .................................................................... E-2
ii
T
List of Figures
Figure 1-1. Front and Rear Panels of the SMC5924DS and
SMC5924 ...............................................................1-2
Figure 1-2. Stacking Base Hubs and Expansion Hubs ............ 1-3
Figure 1-3. Twisted-Pair Ports................................................. 1-5
Figure 1-4. Port and Hub Status LEDs .................................... 1-6
Figure 1-5. Internal Switch Module ........................................ 1-7
Figure 1-6. Network Management Module ............................ 1-8
Figure 1-7. Optional Extender Modules ................................. 1-9
Figure 1-8. Stacking Connectors ........................................... 1-12
Figure 1-9. Rear Panel Receptacles ...................................... 1-13
Figure 2-1. Hub in a Standalone Configuration ...................... 2-2
Figure 2-2. Stack of Six Hubs Supporting 144 Ports .............. 2-3
Figure 2-3. Extending a Stack to Other Hubs ........................ 2-4
Figure 2-4. Using 10/100 Extender Modules ......................... 2-5
Figure 2-5. Using a 100BASE-FX Extender Module ................ 2-6
Figure 3-1. Attaching the Brackets ......................................... 3-5
Figure 3-2. Installing the Hub in a Rack ................................. 3-5
Figure 3-3. Attaching the Adhesive Feet................................ 3-6
Figure 3-4. Stacking the Hubs ................................................ 3-7
Figure 3-5. Power Receptacle ................................................ 3-8
Figure 4-1. Crossover Switches on the 24-Port Hub .............. 4-3
Figure 4-2. Making Twisted-Pair Connections ........................ 4-3
Figure 4-3. Wiring Closet Connections ................................... 4-5
Figure B-1. RJ-45 Connector Pin Numbers ............................. B-3
ABLE OF CONTENTS
iii
T
ABLE OF CONTENTS
iv
COMPLIANCES
FCC - Class A
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 when
the equipment is operated 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. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user
will be required to correct the interference at his own expense.
Industry Canada - Class A
This digital apparatus does not exceed the Class A limits for radio noise
emissions from digital apparatus as set out in the interference-causing
equipment standard entitled “Digital Apparatus”, ICES-003 of the Department
of Communications.
Cet appareil numérique respecte les limites de bruits radioélectriques
applicables aux appareils numériques de Classe A prescrites dans la norme
sur le matériel brouilleur: “Appareils Numériques”, NMB-003 édictée par le
ministère des Communications.
EC Conformance Declaration - Class A
This information technology product was found to comply with the
requirements of the Low Voltage Directive 73/23/EEC and the EMC
Directive 89/336/EEC and carries the CE Mark accordingly. An EC
Declaration of Conformity was issued for this product by:
SMC (Europe) Limited
1st Floor, Pyramid House, Easthampstead Road,
Bracknell, Berkshire RG12 1NS, United Kingdom
Japan VCCI Class A
Wichtige Sicherheitshinweise (Germany)
1. Bitte lesen Sie diese Hinweise sorgfältig durch.
2. Heben Sie diese Anleitung für den späteren Gebrauch auf.
3. Vor jedem Reinigen ist das Gerät vom Stromnetz zu trennen. Verwenden
Sie keine Flüssigoder Aerosolreiniger. Am besten eignet sich ein
angefeuchtetes Tuch zur Reinigung.
4. Die Netzanschlu ßsteckdose soll nahe dem Gerät angebracht und leicht
zugänglich sein.
v
C
OMPLIANCES
5. Das Gerät ist vor Feuchtigkeit zu schützen.
6. Bei der Aufstellung des Gerätes ist auf sicheren Stand zu achten. Ein
Kippen oder Fallen könnte Beschädigungen hervorrufen.
7. Die Belüftungsöffnungen dienen der Luftzirkulation, die das Gerät vor
Überhitzung schützt. Sorgen Sie dafür, daß diese Öffnungen nicht
abgedeckt werden.
8. Beachten Sie beim Anschluß an das Stromnetz die Anschlußwerte.
9. Verlegen Sie die Netzanschlußleitung so, daß niemand darüber fallen
kann. Es sollte auch nichts auf der Leitung abgestellt werden.
10. Alle Hinweise und Warnungen, die sich am Gerät befinden, sind zu
beachten.
11. Wird das Gerät über einen längeren Zeitraum nicht benutzt, sollten Sie
es vom Stromnetz trennen. Somit wird im Falle einer Überspannung eine
Beschädigung vermieden.
12. Durch die Lüftungsöffnungen dürfen niemals Gegenstände oder
Flüssigkeiten in das Gerät gelangen. Dies könnte einen Brand bzw.
elektrischen Schlag auslösen.
13. Öffnen sie niemals das Gerät. Das Gerät darf aus Gründen der
elektrischen Sicherheit nur von authorisiertem Servicepersonal geöffnet
werden.
14. Wenn folgende Situationen auftreten ist das Gerät vom Stromnetz zu
trennen und von einer qualifizierten Servicestelle zu überprüfen:
a. Netzkabel oder Netzstecker sind beschädigt.
b. Flüssigkeit ist in das Gerät eingedrungen.
c. Das Gerät war Feuchtigkeit ausgesetzt.
d. Wenn das Gerät nicht der Bedienungsanleitung entsprechend
funktioniert oder Sie mit Hilfe dieser Anleitung keine Verbesserung
erzielen.
e. Das Gerät ist gefallen und/oder das Gehäuse ist beschädigt.
f. Wenn das Gerät deutliche Anzeichen eines Defektes aufweist.
15 . Zum Netzanschluß dieses Gerätes ist eine geprüfte Leitung zu
verwenden. Für einen Nennstrom bis 6A und einem Gerätegewicht
größer 3kg ist eine Leitung nicht leichter als H05VV-F, 3G, 0.75mm2
einzusetzen.
Der arbeitsplatzbezogene Schalldruckpegel nach DIN 45 635 Teil 1000
beträgt 70dB(A) oder weniger.
vi
CHAPTER 1
ABOUT THE HUBS
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
How to Use this Guide . . . . . . . . . . . . . . . . . . 1-5
Twisted-Pair Ports . . . . . . . . . . . . . . . . . . . . . . 1-5
Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Switch Module . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Optional Network Management Module . . . . . 1-8
Optional Extender Modules . . . . . . . . . . . . . . 1-9
Stacking Connectors . . . . . . . . . . . . . . . . . . . . 1-12
Optional Redundant Power Unit . . . . . . . . . . . 1-13
Power Supply Receptacles . . . . . . . . . . . . . . . 1-13
Features and Benefits . . . . . . . . . . . . . . . . . . . 1-14
1-1
A
BOUT THE HUBS
Overview
SMC’s TigerStack™ II 10/100 family of stackable hubs combines
dual-speed, auto-sensing capability with a variety of management
choices and innovative LAN extensions to create a flexible and
fault-tolerant environment for Fast Ethernet integration and growth.
TigerStack II 10/100 hubs are available in four different models.
Each has either 12 or 24 10BASE-T/100BASE-TX ports plus two
front-panel slots for slide-in modules:
- SMC5912DS—12-port Base Hub preconfigured with Internal
Switch Module
- SMC5924DS—24-port Base Hub preconfigured with Internal
Switch Module
- SMC5912—12-port Expansion Hub
- SMC5924—24-port Expansion Hub
Figure 1-1. Front and Rear Panels of the SMC5924DS, and
SMC5924
1-2
A
BOUT THE HUBS
The DS model Base Hubs are preconfigured with an Internal
Switch Module, and the Network Management Module can be
added as an option. Expansion Hubs come without any
preconfigured modules and can accept a variety of optional
Extender Modules. The Extender Modules provide a switched link
connection to the hub stack using either one 10BASE-T/
100BASE-TX port, one 100BASE-FX port, or one 10BASE2 BNC or
AUI connector. The 100BASE-FX Extender Modules are available
with SC or ST connectors.
The Base Hubs can be used in a standalone configuration to
provide connectivity between 10 Mbps and 100 Mbps devices.
You can build a stack with just one Base Hub and up to five
Expansion Hubs to form a logical hub with up to 144 ports (see
Figure 1-2 below). Each port can be connected to either a 10
Mbps or 100 Mbps device. Ports automatically sense the speed of
an attached device and channel data to the appropriate 10 Mbps
or 100 Mbps segment. The Internal Switch Module in the Base
Hub supports communication between the two segments for all
hubs in the stack.
Figure 1-2. Stacking Base Hubs and Expansion Hubs
1-3
A
BOUT THE HUBS
The hubs contain a comprehensive array of LEDs for “at-a-glance”
monitoring of network and port status. Also, if the Base Hub
contains a Network Management Module, the entire stack can be
managed in-band via SNMP, RMON (groups 1, 2, 3 and 9), or a
Web browser, as well as remotely via Telnet or SLIP. This module
also has a serial port for out-of-band management.
The hubs also provide a measure of fault tolerance. If two Network
Management Modules are installed in the stack, only the module
highest in the stack will be active; the Management Module in the
lower hub is placed in standby mode. The standby Management
Module will automatically take over if the active module fails. In
addition, the hub’s stack connections support an auto-bypass
feature. If any hub in a stack is powered off, data still passes
through the stack connections to all other hubs, so operation of
the rest of the stack remains uninterrupted. There’s also support
for a Redundant Power Unit to ensure continuous operation in the
event of a power failure.
Note: Do not install more than two Network Management
Modules in a stack.
1-4
A
How to Use this Guide
Please read Chapters 1 through 4 when installing the TigerStack II
10/100 hubs. If you have added a Network Management Module
to one of the hubs as an option, also read the Advanced Reference
Guide (included with this module) to learn how to manage your
network.
Twisted-Pair Ports
The RJ-45 ports are located on the front panel of each hub. Ports 1
through 11 on the 12-port models and 1 through 23 on the 24-port
models are labeled with an “x” to indicate that they have a built-in
crossover. Workstations and servers can be connected to these
ports with straight-through cable. The last port on each hub, port
12 or 24, is switch-selectable. There is an associated switch that is
used to enable and disable the crossover, so these ports can always
be connected to another hub or switch with straight-through cable.
BOUT THE HUBS
Figure 1-3. Twisted-Pair Ports
1-5
A
BOUT THE HUBS
Status LEDs
The hub status LEDs are shown below and described in the
following table.
Figure 1-4. Port and Hub Status LEDs
DELnoitidnoCsutatS
rewoPnO.rewopgniviecersibuH
sDELsutatSbuHdnatroP
1-6
hctiwSnOhctiwslanretnis'eludomdellatninA
ffOhctiwslanretninahtiweludomA
ytivitcAgnihsalF.tnemgesehtnostsixeciffarT
noisilloCgnihsalFotdetpmettasecivederomroowT
/kniL
noititraP
neerGspbM001dilavadehsilbatsesahtroP
wolleYspbM01dilavadehsilbatsesahtroP
gnihsalFlamronbanaoteuddenoititraptroP
.evitcasinoitcnuf
.evitcanisirodellatsnitonsinoitcnuf
.emitemasehttaatadtimsnart
.noitcennoc
.noitcennoc
.noitidnockrowten
A
Internal Switch Module
Figure 1-5. Internal Switch Module
Located in the top expansion slot of the DS hub models, the
Internal Switch Module interconnects the 10 Mbps and 100 Mbps
segments and employs a buffered store-and-forward architecture to
prevent bad packets from being propagated throughout the
network. It also features a non-blocking design that allows
simultaneous wire-speed transport in both directions at consistently
low latency.
A MAC address table that can hold 4K entries is provided for
learning, filtering and forwarding. Addresses are automatically
learned and maintained in the address table to enable the switch to
perform filtering and forwarding at line-rate speeds. When a
packet is encountered containing a destination address that does
not appear in the table, the packet is broadcast to both segments.
BOUT THE HUBS
If more than one Internal Switch Module or Extender Switch
Module is in a stack, only the internal switch function
(interconnecting the 10 and 100 Mbps segments) that is in the
module highest in the stack will be active; the internal switch
function in all other modules is disabled automatically. Note that if
the active internal switch function should fail, the stack needs to
be reset for another module’s internal switch function to become
active.
1-7
A
BOUT THE HUBS
Optional Network Management Module
Figure 1-6. Network Management Module
As an option, a Network Management Module can be inserted into
the bottom slot of any hub model to manage the entire stack. It
offers a variety of management options, including SNMP, RMON
and a web-based interface. The management features are
described in the Advanced Reference Guide included in the
Network Management Module package.
This module also includes an RS-232 port for out-of-band
management and a Master LED which is described below.
DELretsaM
NO.edomevitcanisieludoM
FFO.)evitcani(edomybdnatsnisieludoM
A stack can support two Network Management Modules. The
module highest in a stack is active and the other module is placed
in standby mode. The standby module automatically takes over if
the active module fails.
Note: Do not install more than two Network Management
Modules in a stack.
1-8
Optional Extender Modules
A
BOUT THE HUBS
Figure 1-7. Optional Extender Modules
There are seven Extender Modules to choose from. Each provides
a switched link from the stack’s 100 Mbps segment that can be
used to extend the size and reach of the stack. The Extender
Switch Modules also include the internal switch function to
interconnect the 10 Mbps and 100 Mbps segments.
1-9
A
BOUT THE HUBS
- SMC5900T—one external 10BASE-T/100BASE-TX port, choice
of crossover or daisy-chain connection
- SMC5900FSC—one external 100BASE-FX port with SC
connectors
- SMC5900FST—one external 100BASE-FX port with ST
connectors
- SMC5900T/SW—one external 10BASE-T/100BASE-TX port,
choice of crossover or daisy-chain connection; plus internal
switch function
- SMC5900FSC/SW—one external 100BASE-FX port with SC
connectors; plus internal switch function
- SMC5900FST/SW—one external 100BASE-FX port with ST
connectors; plus internal switch function
- SMC5900BA/SW—one external switch-selectable BNC or AUI
port; plus internal switch function
The 10BASE-T/100BASE-TX port may be connected to an
Ethernet or Fast Ethernet device, such as a hub, workstation,
server or another switch. The port supports Auto-Negotiation, so
the optimum data rate and operating mode—10 or 100 Mbps and
half or full duplex—is selected automatically. However, if the
other device does not support Auto-Negotiation, the data rate and
operating mode can be forced to 100 Mbps full duplex via the
100Full/Auto toggle switch on the front of the module. Note that
if an attached device does not support Auto-Negotiation and
operates at 10 Mbps full duplex, then you can only configure the
module’s port to the correct settings using the Network
Management Module.
The 100BASE-FX port can be connected to a remote site with up
to 2 km (1.24 mi.) of fiber cable in full-duplex mode or up to
412 m (1,351.4 ft.) in half-duplex mode. The operating mode can
be set manually using the Full/Half toggle switch on the front of
the module. Note that this module operates only at 100 Mbps.
1-10
A
sDELeludoMrednetxE
sDEL noitidnoC sutatS
flaH/lluFnO.xelpudlluftatessitroP
noisilloCgnihsalFotdetpmettasecivederomroowT
.emitemasehttaatadtimsnart
ytivitcAgnihsalF.atadgniviecerrognittimsnartsitroP
otlanoitroporpsignihsalffoetarehT
.ciffartkrowtenfotnuomaeht
kniLnOnodehsilbatseneebsahknildilavA
.tropsiht
M001nOT-ESAB01(spbM001tagnitarepositroP
.)ylnoeludomXT-ESAB001/
BOUT THE HUBS
The BNC and AUI ports allow connection to legacy 10 Mbps
network segments. The BNC port connects to 10BASE2 thin coax.
The AUI port can be connected to 10BASE5 thick coax or 10
Mbps fiber via an appropriate transceiver. The active port is
selected by the toggle switch on the front of the module.
1-11
A
BOUT THE HUBS
Stacking Connectors
The stacking connectors are located on the rear panel of each hub.
Figure 1-8. Stacking Connectors
One connector is labeled “Out” and the other, “In.” A Stacking
Cable is shipped with each hub.
1-12
A
BOUT THE HUBS
Optional Redundant Power Unit (RPU)
An RPU can supply power to the switch in the event of a failure of
the internal power supply. Contact your reseller for advice
regarding the appropriate SMC RPU for your specific application.
Power Supply Receptacles
There are two power receptacles on the rear panel of each hub.
The standard power receptacle is for the AC power cord. The
14-pin receptacle labeled “DC Input” is for the optional Redundant
Power Unit (RPU).
Figure 1-9. Rear Panel Receptacles
1-13
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