D-Link DE-81 6TP Manuale utente

Table of Contents

About this Guide .............................................

Rack Mounting ................................................

Installing Network Cables..............................

Station Connections with

Twisted-Pair Cable...

......................................

Hub-to-Hub connections with

Twisted-Pair Cable

........................... 4

Thin Coaxial Cable Connections.. .......

Thick Coaxial Cable Connections

....

...9

Connecting Power..........................................

LED Indicators.............................................

Specifications ................................................

Rev. 06 (April ‘98)

6DE824TP..06

Printed In China

About this Guide

This guide provides instructions for instal-ling all

of the products described below. These D-Link@

Ethernet Hubs are all Plug and Play compliant for

easy installation.

DE81

2TP+

DE-81 6TP

DE-824TP

When designing your cable configuration, it is

necessary to strictly observe the Ethernet cabling

rules. This manual assumes familiarity with the

fundamental Ethernet cabling rules and limits; it

only describes the details of cable connection.

Rack Mounting

The Ethernet Hub may stand alone, or may be

mounted in a standard

19-inch

equip-ment rack.

Rack mounting produces an orderly installation

when you have a number of related network

devices. Use the six supplied screws

fasten the

supplied mounting brackets to either end of the

hub, then fasten the hub into the rack.

Installing Network Cables

Your Ethernet Hub is denominated as an 12-port,

or 16-port, or

24-port

Ethernet Hub according to

the number of its front-panel

1OBaseT

ports.

Additionally it has two ports whose connectors are

on the rear panel: one lOBase2 port (BNC

connector), and one

lOBase5

port (AUI connector).

These two un-numbered rear-panel ports are

logically equivalent with the numbered ports on

the front panel of the Ethernet Hub.

By using a rear-panel connector of the Ethernet

Hub to connect into an existing coaxial network

cable, you can add on a star-topology

subnet,

connected through the Ethernet Hub’s numbered

front-panel ports. Alternatively, you can connect

into an existing star-topology through a front

panel port of the Ethernet Hub, and then add on a

bus-topology subnet by connecting the subnet bus

to a rear-panel connector of the Ethernet Hub

(irrespective of any star-topology subnet that may

also be supported by the Ethernet Hub’s

front-

panel ports). In either case, the unused

rear-

panel connector always remains available to

connect a second coaxial cable (alternative type of

coaxial cable).

When the Ethernet Hub has no coaxial trunk

connection, then both of the rear panel connectors

remain

available for coaxial station-cable

connections.

It is useful to keep this in mind

when you have some station equipment whose

adapters have no 1OBaseT port (RI-45 connector),

and thus can only be connected to the hub through

a coaxial cable.

Connect each station to the Ethernet Hub by

means of a twisted-pair straight cable

(10BaseT

cable, Category 3, 4, or 5). Plug one

RJ-45

connector into a front-panel port of the Ethernet

Hub, and plug the other

RJ-45

connector into the

station’s Ethernet adapter.

’

UTP cable

RJ-45

connector

Hub-to-hub connection between Model

DE-

812TP+

Ethernet Hubs requires a

1OBaseT

crossover cable. In making a hub-to-hub

connection involving a Model DE-816TP or Model

DE-824 Ethernet Hub, there is the alternative of

using a straight cable.

Internal Crossover Features

The Model DE-816TP Ethernet Hub and DE-

824TP Ethernet Hub feature internal cross-over

alternatives for Port 1:

Model DE-816TP Ethernet Hub

The port numbered as Port 1 is identical with

each of the other numbered ports. But Port 1

is specially equipped with an alternative

connector,

labeled

“Uplink.” The

Uplink

connector is wired to the same conductors as

the Port 1 connector, but with certain pin

positions interchanged to provide a cross-

over, and thus allow use of a straight cable to

make a hub-to-hub connection.

Keep in mind that the Uplink connector is not

an independent-port. It is only an alternative

connector to Port 1, to facilitate hub-to-hub

cabling. Port 1 is fully occupied whenever (1)

a hub-to-hub connection is made through its

Uplink

connector, or (2) any kind of

connection is made directly through the Port

1 connector

Below in this manual, the term

“Uplink

selected” will mean, as to the Model DE-

816TP Ethernet Hub in question, that the

subject connection is made through the

Uplink

connector

Model DE-824TP Ethernet Hub

The connector numbered as Port 1 is equipped

with a switch

labeled

“Uplink”

When the

Uplink switch is in the “off (tall) position, the

Port 1 connector is wired “straight” to the

supporting circuitry, and Port 1 is then

identical with each of the twenty-three other

numbered ports. When the

Uplink

switch is

in the “on” (depressed) position, a pin inter-

change is switched into the wiring for the

Port 1 connector, to provide a cross-over, and

thus allow use of a straight cable to make a

hub-to-hub connection.

Below in this manual, the term

“Uplink

selected” will mean, as to the Model DE-824TP

Ethernet Hub in question, that the subject

connection is made through Port 1 and the

Uplink

switch is in its “on” (depressed)

position.

Rules for Using the

Uplink

Feature

Uplink should never be selected for a station cable

connection. And

Uplink

should never be selected

for a hub-to-hub connection through a crossover

cable (because the crossover in the connector

wiring would cancel out the crossover in the

cable).

Uplink

should be selected only for making a

hub-

to-hub connection with a straight cable. When

Uplink

is selected at one end of a straight cable,

Uplink

must not be selected at other end of that

cable.

(If

Uplink

were selected at both ends of a

straight cable, then the built-in crossovers of the

two connectors would cancel one another, and the

hub-to-hub connection would fail.)

Thus the rule for making a hub-to-hub connection

with twisted-pair cable is as follows:

To make a hub-to-hub connection with a

straight cable,

Uplink

must

be selected at

one end of the cable, and

Uplink

must not

be selected at the other end of the cable.

To make a hub-to-hub connection with a

cross-over cable,

Uplink

must not be

selected at either end of the cable.

To connect the Ethernet Hub to a thin coaxial

cable (lOBase2 cable, also known by its

wire-

standard name,

RG58A/U,

and a variety of other

informal names), first twist a BNC T-connector

onto the rear-panel BNC connector of the

Ethernet Hub. Then twist the shell of the cable’s

connector onto either leg of the BNC T.

If the thin coaxial cable continues on to other

nodes, then twist the shell of the continuation

cable onto the remaining leg of the BNC T. If

there is no continuation (the Ethernet Hub is at

the end of the coaxial cable), then it is necessary to

twist a

50-ohm

terminator onto the remaining

open leg of the BNC T.

Thin coax Segment

Sometimes several Ethernet Hubs must be

co-

located to support a larger array of stations than

can be handled by a single Ethernet Hub. Then it

is useful to stack the Ethernet Hubs by joining

their BNC connectors with 0.5 meter patches of

thin coaxial cable. Such stacking is just a special

case of thin coaxial cable connection as treated

above, and the terminator rule is the same: If the

stack is at the end of the incoming cable, then a

50-ohm terminator must be substituted for the

continuation cable shown in the stacking diagram

below.

Tonext

node

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