User manual 3COM OFFICECONNECT HUB 8/TPO

[. . . ] OfficeConnect® Ethernet Hub 4, 4C, 8, 8C User Guide (3C16704A, 3C16703A, 3C16700A, 3C16701A) 3Com Corporation s 5400 Bayfront Plaza s Santa Clara, California s 95052-8145 Copyright © 1999, 3Com Technologies. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Technologies. 3Com Technologies reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Technologies to provide notification of such revision or change. 3Com Technologies provides this documentation without warranty, term, or condition of any kind, either implied or expressed, including, but not limited to, the implied warranties, terms or conditions of merchantability, satisfactory quality, and fitness for a particular purpose. [. . . ] If a terminator is not used, the port partitions and the 10BASE-2 Port Status LED lights yellow. This is correct operation. 19 Connecting Hubs Using 10BASE-2 Connect a 10BASE-2 `Y' piece to each of your hubs (Hub 8C only). Connect the `Y' pieces with 10BASE-2 cable to form a single segment, as shown in Figure 7. Remember to terminate the two free ends of the segment by fitting terminators (end pieces). To disconnect a 10BASE-2 cable, twist each connector counter-clockwise to unlock it, and remove it. When using 10BASE-2 cable, it is important that both ends of the segment are properly terminated with 50 Ohm terminators (end pieces). You can use `T' pieces but `Y' pieces provide optimum clearance of the other ports. Figure 7 Correct Hub Connections Using 10BASE-2 50 Ohm terminator Checking Connections When you have connected your hubs, power them on. The Port Status LEDs for the 10BASE-2 ports you have used should be off. Minimum length of each cable is 0. 5m (1. 6ft) Maximum segment length is 185m (607ft) (from terminator to terminator) `Y' piece 50 Ohm terminator 20 Connecting Hubs Using 10BASE-T You can connect hubs together with 10BASE-T in a number of ways, but for simplicity we recommend the following method, as shown in Figure 8: 1 Starting from the bottom, connect the port 8 of the If you suspect there is a problem, refer to "Problem Solving for the Hub 8 and 8C" on page 22. Figure 8 Correct Hub Connections Using 10BASE-T lower hub to port 7 of the hub immediately above. Repeat this for each hub. 2 Set all Uplink/Normal switches to Uplink (in) except for the top hub (the one with port 8 not connected to another hub). This unused port can be connected to a workstation provided that the Uplink/Normal switch is set to Normal (out). Switch set to Normal (out) Checking Connections When you have connected your hubs, power them on. The Port Status LEDs for the 10BASE-T ports you have used should be green. If the 10BASE-2 port is not used and is not terminated, the LED should be yellow showing that it has partitioned. This is correct operation. Switch set to Uplink (in) Switch set to Uplink (in) Spot Checks At frequent intervals, visually check that: s The Alert LED is not lit -- this is the best way to find out if there are problems with your network. Cabling is secure and not pulled taut. 21 10BASE-T cable with RJ-45 connectors. Maximum length of each cable is 100m (328ft) s s PROBLEM SOLVING FOR THE HUB 8 AND 8C The OfficeConnect hub has been designed to aid you when detecting and solving possible problems with your network. These problems are rarely serious, the cause is usually a disconnected or damaged cable, or incorrect configuration. If this section does not solve your problem, contact your supplier for information on what to do next. Each piece of equipment needs only one connection to your OfficeConnect hub. It is likely that there is a loop in your network which has caused this port to partition. Each piece of equipment needs only one connection to your OfficeConnect hub. The LED will change from yellow to green, on receiving a valid packet on the port. [. . . ] The ninety (90) day period begins on the date of Customer's product purchase. to 5 p. m. , local time, Monday through Friday, excluding local holidays. Telephone technical support is limited to the 3Com products designated above and may include assistance with installation, product specific configuration, and identification of equipment problems. Please refer to the Technical Support appendix in the User Guide for telephone numbers. [. . . ]