D-Link DE-824TP, DE81 2TP+, DE-81 6TP User Manual

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
Thin Coaxial

Thick Coaxial Cable Connections
Connecting Power

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

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

Cable Connections.. .......

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

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

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

....

...9

1

2
3

4

4

.7

9
10
11

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.

\

1

Rack Mounting

The Ethernet Hub may stand alone, or may be
mounted in a standard
Rack mounting produces an orderly installation
when you have a number of related network
devices. Use the six supplied screws to fasten the
supplied mounting brackets to either end of the
hub, then fasten the hub into the rack.

19-inch

equip-ment rack.

2

Installing Network Cables

Your Ethernet Hub is denominated as an 12-port,
or 16-port, or
the number of its front-panel
Additionally it has two ports whose connectors are
on the rear panel: one lOBase2 port (BNC
connector), and one
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
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
panel ports). In either case, the unused
panel connector always remains available to
connect a second coaxial cable (alternative type of
coaxial cable).

24-port

Ethernet Hub according to

lOBase5

port (AUI connector).

1OBaseT

ports.

subnet,

front-

rear-

When the Ethernet Hub has no coaxial trunk

connection, then both of the rear panel connectors
remain
connections.
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.

available for coaxial station-cable

It is useful to keep this in mind

3

Connect each station to the Ethernet Hub by
means of a twisted-pair straight cable
cable, Category 3, 4, or 5). Plug one

(10BaseT

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.

w

RJ-45

connector

Hub-to-hub connection between Model
812TP+

Ethernet Hubs requires a

UTP cable

’

DE-

1OBaseT

crossover cable. In making a hub-to-hub

4

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 DE­824TP 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,
connector is wired to the same conductors as
the Port 1 connector, but with certain pin
positions interchanged to provide a cross­over, 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
connection is made directly through the Port

1 connector

labeled

“Uplink.” The

connector, or (2) any kind of

Uplink

Below in this manual, the term
selected” will mean, as to the Model DE­816TP Ethernet Hub in question, that the
subject connection is made through the
Uplink

connector

5

“Uplink

+

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 inter­change 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).

should be selected only for making a

Uplink

hub­to-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

6

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,

one end of the cable, and

Uplink

must

be selected at

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
standard name,

RG58A/U,

and a variety of other

wire-

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.

7

Thin coax Segment

v

Sometimes several Ethernet Hubs must be

co­located 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

8

To connect the Ethernet Hub to a thick coaxial
cable (lOBase cable), it is necessary to have a

lOBase Ethernet transceiver (tap) on the cable at

the Ethernet Hub’s position. Then run an

AUI
cable between the transceiver’s AUI connector and
the AUI connector on the rear panel of the Ethernet
Hub.

AUI port

-AU1

cable

Transceiver

x

Connecting Power

For compatibility with electric service in most
areas of the world, the Ethernet Hub’s power
supply automatically adjusts to line power in the
range 100

Per ordering option, either a Type 1 (US) or Type 2
(European) power cord is supplied with your
Ethernet Hub. See Spefications, below, for power
cord details.

Ascertain that the power switch on the rear panel
of the Ethernet Hub is in the off position.
female end of the power cord firmly into the

-

240 VAC and 50 - 60 Hz.

9

Plug the

receptacle on the rear panel of the Ethernet Hub.
Plug the other end of the power cord into an
electric service outlet. Turn on power to the
Ethernet Hub by switching its rear-panel power
switch to the

on

position.

LED Indicators

LED indicators are located on the front panel of

the Ethernet Hub.

Jabber LED

One Jabber LED for all ports. This LED
flashes red when the Ethernet Hub detects a
data packet that is defective (exceeds allow­able length). This kind of error will ordinarily
be managed by the offending Ethernet adapter
itself, in which case the Jabber LED will re­turn to its normal off (dark) state.

Collision LED

One Collision LED for all ports. A collision
occurs when two stations within a collision
domain attempt to transmit at the same time.
Intermittent flashing yellow of the Collision
LED is normal; the contending adapters
resolve each collision by means of a
then-retransmit algorithm.
collisions is an indicator of heavy traffic on
the network.

Fre-quency of

wait-

10

One Link/Rx LED for each numbered port.
Steady green

(Link

state) indicates that the
port has good linkage to its partner device.
Flashing green

(Receive

state) indicates that
the port is receiving data from its partner
device.

If the port is connected but the Link/Rx LED

is dark, check whether (1) the Ethernet Hub

and the partner device both have power, (2)
the port’s cable is firmly seated in its
connectors in the Ethernet Hub and in the
partner device, (3) the connecting cable is
good and is of the correct type, and
partner device, including any network

adapter, is functioning.

Specifications

(4)

the

Data transfer rate:

Protocol:
Topologies:
EMI Certification:
AC power:
Power consumption:

10

Mbps
CSMA/CD
Star, Bus

FCC Class A, VCCI 1, CE A

I

DE-812TP+:
DE-816TP:

DE-824TP:

11

18W

18W

2ow

Dimensions:

Weight:

W x H x L, mm (including mounting

brackets):
DE-812TP+: 483x44 125
DE-81 6TP:
DE-824TP 483x44 211
DE-81 2TP+: 2.0 kg
DE-816TP: 2.0 kg
DE-824TP: 3.03 kg

483x44 125

Operating
temperature:

Humidity: 10
Power cord: Type 1 (US) or Type 2 (Europe) per

Plug Rating
Cord Rating
Length
Safety

Standard

-

55” c

0”

-

90 % non-condensing

I

125V, 7A
125V, 7A

1830mm

(6ft)

UL, CSA

12

25OV,
25OV,

1830mm

VDE

1OA
10A

(6ft)

D-Link Office

USA

Canada

UK

Sweden

Australia

Denmark

Singapore

China

India

Taiwan

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Unib#6,

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