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3Com 3C16792 User Guide - Page 16

Port Status LED not lit for a 10BASE-T port that has a, connection. - 16 port

UPC - 662705404578

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Port Status LED not lit for a 10BASE-T port that has a connection. There is a problem with this connection. Check that you are using a straight-through 10BASE-T cable which is properly connected at both ends, and is not damaged. If the cable is connected to port 4, ensure that the Uplink/Normal switch is set to Normal (out). Also check that the equipment being connected to the hub is powered on and operating correctly. Refer to Figure 6 below to compare the wiring of a straight-through and a crossover cable. Figure 6 Straight-through Cable/Crossover Cable Straight-through TxD+ 1 TxD- 2 RxD+ 3 RxD- 6 1 TxD+ 2 TxD3 RxD+ 6 RxD- Pins 4, 5, 7 and 8 are not used Crossover TxD+ 1 TxD- 2 RxD+ 3 RxD- 6 1 TxD+ 2 TxD3 RxD+ 6 RxD- Pins 4, 5, 7 and 8 are not used 16

Section	Page
OfficeConnect® Ethernet Hub 4, 4C, 8, 8C	1
3Com Corporation n 5400 Bayfront Plaza n Santa Clara, California n 95052-8145	2
Introduction	5
Figure 1 Small Network With OfficeConnect Hub and Optional Print Server	5
Creating your Network	6
What Else Do I Need?	6
Workstation Connections	6
1 10BASE-T connections for all your equipment. 3Com produce a range of easy to install network ad...	6
2 An operating system (for example, Netware or Windows95/98) with network support configured, ru...	6
3 One straight-through TP cable for every workstation, as shown in Figure 2.	6
Transceiver Connections	6
Hub Connections	7
10BASE-2	7
Figure 2 Some of the 10BASE-2 Equipment You May Need	7
10BASE-T	7
Twisted Pair (TP) Cables	7
Stacking the Units Together	8
The Rubber Feet	8
The Stacking Clip	8
1 Place your unit on a flat surface.	8
2 Fit the clip across the top of the unit, as shown in Figure 3 (picture 1), ensuring that the lo...	8
3 Align the fastening pieces over the slots found on each side of the unit.	8
4 Push the clip down gently to secure it, ensuring the fastening pieces snap into the slots on th...	8
1 Rest the second unit on top of the clip and align it with the front of the unit below.	8
2 Press down gently on the unit to secure it onto the clip, ensuring the fastening pieces fit int...	8
Figure 3 Stacking Your Units Together	8
1 Remove the top unit together with the clip. If you hook a finger around one of the the fastenin...	8
2 Push the clip in the center, so it bends towards the base of the unit, and then separate once t...	8
Positioning Your Hub	9
Securing Your Hub	9
Using Your Hub	9
The OfficeConnect Ethernet Hub 4 and 4C	10
Ethernet Hub 4 and 4C—Front	10
Ethernet Hub 4 and 4C—Rear	11
Connecting Workstations and Other Equipment to Your Hub	12
Connecting Transceivers to the AUI Port	12
Connecting OfficeConnect Ethernet Hubs Together	12
Connecting Hubs Using 10BASE-2	13
Checking Connections	13
Figure 4 Correct Hub Connections Using 10BASE-2	13
Connecting Hubs Using 10BASE-T	14
1 Starting from the bottom, connect the port 4 of the lower hub to port 3 of the hub immediately ...	14
2 Set all Uplink/Normal switches to Uplink (in) except for the top hub (the one with port 4 not c...	14
Checking Connections	14
Spot Checks	14
Figure 5 Correct Hub Connections Using 10BASE-T	14
Problem Solving for the Hub 4 and 4C	15
Figure 6 Straight-through Cable/ Crossover Cable	16
The OfficeConnect Ethernet Hub 8 and 8C	17
Ethernet Hub 8 and 8C—Front	17
Ethernet Hub 8 and 8C—Rear	18
Connecting Workstations and Other Equipment to Your Hub	19
Connecting OfficeConnect Ethernet Hubs Together	19
Connecting Hubs Using 10BASE-2	20
Checking Connections	20
Figure 7 Correct Hub Connections Using 10BASE-2	20
Connecting Hubs Using 10BASE-T	21
1 Starting from the bottom, connect the port 8 of the lower hub to port 7 of the hub immediately ...	21
2 Set all Uplink/Normal switches to Uplink (in) except for the top hub (the one with port 8 not c...	21
Checking Connections	21
Spot Checks	21
Figure 8 Correct Hub Connections Using 10BASE-T	21
Problem Solving for the Hub 8 and 8C	22
Figure 9 Straight-through Cable/ Crossover Cable	23
Networking Terminology	24
Dimensions and Standards	25
Dimensions and Operating Conditions	25
Standards	25
Environmental Statements	26
End Of Life Statement	26
Regulated Materials Statement	26
Environmental Statement about the Documentation	26
Environmental Statement about the Product Packaging	26
Important Safety Information	27
Wichtige Sicherheitshinweise	28
Consignes importantes de sécurité	29
Technical Support	30
Online Technical Services	30
World Wide Web Site	30
3Com Knowledgebase Web Services	30
Support from Your Network Supplier	31
Support from 3Com	31
Returning Products forRepair	34
Hardware	35
Software	35
Year 2000 Warranty	35
Obtaining Warranty Service	35
Warranties Exclusive	36
Limitation of Liability	36
Disclaimer	37
Governing Law	37
FCC Statement	38
CSA Statement	38
VCCI Statement	38
BCIQ Statement	38