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Quick Installation GuideEtherHub-24s
6 7
Power and Cooling Problems
If the power indicator does not turn on when the power cord is plugged in, you
may have a problem with the power outlet, power cord, or internal power
supply as explained in the previous section. However, if the unit powers off
after running for a while, check for loose power connections, power losses or
surges at the power outlet, and verify that the fan on back of the unit is
unobstructed and running prior to shutdown. If you still cannot isolate the
problem, then the internal power supply may be defective. In this case,
contact your Accton distributor for assistance.
Installation
Verify that all system components have been properly installed. If one or more
components appear to be malfunctioning (e.g., the power cord or network
cabling), test them in an alternate environment where you are sure that all the
other components are functioning properly.
Port and Cable Assignments
RJ-45 Port Description
RJ-45 station ports (MDI-X) can be attached to any devices which use a
standard network interface (e.g., a workstation, server, bridge or router).
Similar networking devices (e.g., another hub or switch) can be cascaded by
connecting any of the RJ-45 station ports on the hub to a daisy-chain port
(MDI) on the other device. Use 100W Category 3, 4 or 5 twisted-pair cable:
unshielded or shielded (UTP/STP) cable for all RJ-45 connections on the front
panel, and shielded (STP) cable for the stack ports on the rear panel. Also be
sure that the length of any twisted-pair connection does not exceed 100
meters (328 feet).
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2-ataDevieceRtupnI-ataDtimsnarTtuptuO
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Schematics for both straight and crossover twisted-pair cable are shown below.
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+DRI1+DTO1+DRI1+DRI1
-DRI2-DTO2-DRI2-DRI2
+DTO3+DRI3+DTO3+DTO3
-DTO6-DRI6-DTO6-DTO6
EMI Certification
FCC Class A (USA)
Warning: This equipment generates, uses, and can radiate radio frequency energy and,
if not installed and used in accordance with the instruction manual, may cause
interference to radio communications. It has been tested and found to comply with the
limits for a Class A digital device pursuant to Subpart B of Part 15 of FCC Rules, which
are designed to provide reasonable protection against such interference when
operated in a commercial environment. Operation of this equipment in a residential area
is likely to cause interference, in which case the user, at his own expense, will be
required to take whatever measures are required to correct the interference.
You may use unshielded twisted-pair (UTP) for RJ-45 connections - Cat. 3 or greater.
Class A (Canada Department of Communications)
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 Numérques", NMB-003 édictée par le ministère des Communications.
Class A (Taiwan Bureau of Commodity Inspection)
VCCI Class A Compliance (Japan)
CE Mark Declaration of Conformance for EMI and Safety (EEC)
This is to certify that this product complies with ISO/IEC Guide 22 and EN45014.
It conforms to the following specifications:
EMC: EN55022(1988)/CISPR-22(1985) class A
EN60555-2(1995) class A
EN60555-3
IEC1000-4-2(1995) 4kV CD, 8kV AD
IEC1000-4-3(1995) 3V/m
IEC1000-4-4(1995) 1kV - (power line), 0.5kV - (signal line)
This product complies with the requirements of the Low Voltage Directive 73/23/EEC
and the EMC Directive 89/336/EEC.
Warning! Do not plug a phone jack connector in the RJ-45 port. This may damage this
device. Les raccordeurs ne sont pas utilisé pour le système téléphonique!