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3C16440

SuperStack II Baseline Hub

12 port

3C16441

SuperStack II Baseline Hub

24 port

3C16592A

SuperStack II Baseline Dual Speed Hub

12 port

3C16593A

SuperStack II Baseline Dual Speed Hub

24 port

3C16460

SuperStack II Baseline Switch

12 port 10 Mbps switched ports plus

2 x 10/100 Mbps auto-sensing ports

3C16462

SuperStack II Baseline Switch

24 port 10 Mbps switched ports plus

2 x 10/100 Mbps auto-sensing ports

3C16464A

SuperStack II Baseline 10/100 Switch

12 port

3C16465A

SuperStack II Baseline 10/100 Switch

24 port

Full-duplex autonegotiation

Most links between network devices

run in half-duplex mode. This is the

traditional mode of Ethernet opera-

tion allowing communication across

the cabling in one direction at any

particular time. Full-duplex mode

allows simultaneous bidirectional

traffic. It effectively doubles the

throughput across UTP cable to

20 Mbps for Ethernet and 200 Mbps

for Fast Ethernet.

Full-duplex communication can only

be sustained between two switches,

or between a switch and a network

end-station (such as a PC or server).

Hubs (Ethernet or Fast Ethernet)

are not able to support full-duplex

network links according to ISO/IEEE

standards.

Full-duplex autonegotiation is

the process where the network

devices at either end of the cable

SuperStack II Power Systems

1. Advanced Redundant Power System

For the ultimate protection

against network downtime, all

SuperStack II Baseline products

are equipped with a connector to

support the SuperStack II advanced

Redundant Power System (ARPS).

This system gives you the means

to provide SuperStack II units

with a redundant power supply

source for uninterrupted operation

in the unlikely event of a power

supply failure.

MTBF (hours)

Theoretical

103,389 1,779,785

(203 years)

97,425

(156 years)

55,816

44,949

76,820

73,491

82,963

67,662

(for example a switch and a server)

automatically decide whether they

will communicate in either full- or

half-duplex mode. It will happen

almost instantaneously when the

UTP cable is connected and the link

is first made.

Full-duplex operation is especially

effective for relieving bottlenecks

that might exist in a network,

for example, on a link between two

switches or on a link from a switch

to a network server.

All SuperStack II Baseline Switches

support full-duplex autonegotiation

on every port, so you can be sure

you get the ultimate capacity from

your installed equipment.

2. Uninterruptible Power System

The SuperStack II Uninterruptible

Power System (UPS) keeps your

system up and running during power

failures or disruption to the main

supply. Up to four SuperStack II

units can be powered from a single

UPS. The system also protects you

against brownouts or spikes that

occur in outside power lines.

Reliability

Actualized

3Com Baseline products have been

designed with reliability in mind.

You can be assured they will give

you troublefree operation. 3Com uses

1,368,075

advanced HALT (Highly Accelerated

Life Test) techniques at the design-

459,360

phase to stress-test our products

(52 years)

far beyond any normal operating

307,563

conditions. We can identify and

(35 years)

design-out even the most minimal

507,012

contributors to unit failure.

(57 years)

This is reflected in the reliability

figures for each of the SuperStack II

Baseline products, as shown in the

625,408

table. Reliability is expressed as a

(71 years)

Mean Time Before Failure (MTBF)

in hours, and calculated according

760,096

to an established industry standard

(87 years)

(MIL-HBK 217 F Notice 1). Because

645,753

the theoretical calculation has proved to

(74 years)

be extremely conservative, we also quote

an actualized figure. This is derived

from the in-service reliability track

record of the tremendous installed-base

of 3Com SuperStack II products.

The table shows that for simpler

technology such as hubs, the MTBF

is far greater than on more complex

products such as dual-speed hubs.

Even so, with a worst-case MTBF

of 35 years, the SuperStack II Baseline

products have built-in reliability found

in no other brand.

Warranty

For complete peace-of-mind, all 3Com

SuperStack II Baseline products come

with a lifetime limited warranty.

As part of this we provide you with

an advanced hardware exchange

service for the first year from your

date of purchase, in accordance with

3Com's standard terms and conditions.

To qualify, you must complete and

return your product registration card

to 3Com. Consult your user guide for

full details.

MDI/MDIX Switch

The MDI/MDIX switch on the

front panel of 3Com's SuperStack II

Baseline products lets you build

your entire network using standard

UTP cabling. By using the MDI/MDIX

switch, your hubs and switches are

cascaded together without the need

to use special crossover cable.