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HP 100Base-T Hubs Installation and Reference Guide

2-8 Installing the System

on the target device (or vice versa). When inserting an RJ-45

plug, be sure the tab on the plug clicks into position to ensure

that it is properly seated. Note that the length of twisted-pair

cable should not exceed 100 meters.

Connecting Fiber Optic Cabling - For the 100Base-FX module,

prepare fiber optic cable with SC-type connectors at both ends.

When connecting the module directly to an end-node device

(e.g., workstation or file server), run cable from the Rx (Tx)

port on the module to the Tx (Rx) port on the target device (i.e.,

two separate cables). Also, when cascading Switch Port

Modules, make similar connections between the current module

and the next device in the stack (i.e., using two separate cables).

When inserting a cable, be sure the tab on the plug clicks into

position, to ensure that it is properly seated. Note that as a

general rule, the length of fiber optic cable for a single switched

link should not exceed 2 kilometers. However, timing

constraints and power budgeting must also be considered when

calculating the maximum cable length for your specific

environment.

Collision Domain Timing Constraints - Where fiber optic cable

and twisted-pair links exist in a single collision domain with

other repeater devices, the fiber length has to be limited to

satisfy Fast Ethernet timing constraints. The following table

should be used as a guide for the maximum fiber length as

applied in four basic topology models (IEEE802.3u).

Basic Topology Model Max. Fiber Length

6LQJOH6ZLWFKHG/LQN IXOOGXSOH[ P

KDOIGXSOH[ P

:LWK&ODVVI5HSHDWHU 7;);OLQNVRQO\ P

LIDQ\7OLQNVSUHVHQW P

:LWK&ODVVII5HSHDWHU7;);OLQNVRQO\ P

:LWK&ODVVII 5HSHDWHUV7;);OLQNVRQO\ P

Table 2.1 Maximum Fiber Lengths for Basic Topology Models

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 156 157

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HP 100BaseT Guide de l'utilisateur Page 40