DATA SHEET
®
OfficeConnect Switches and Hubs
Easy to Install and Use
Free Telephone Support
Key Benefits
Enjoy plug-and-play simplicity.
3Com offers telephone assistance dur-
ing the first 90 days, including instal-
lation and general troubleshooting.
Simple Troubleshooting
Get at-a-glance network status infor-
mation from front-panel diagnostic
LEDs, including a unique Alert LED.
Engineered for Small-Business Needs
The OfficeConnect family is the first
solution designed specifically for
small-office operations—often imi-
tated but never equaled by other
network vendors.
Compact Design
Save valuable small-office space with
compact, ergonomic, and clippable
design.
Lifetime Limited Warranty
Ensures peace of mind when purchas-
ing OfficeConnect products; includes
power adapters.
Specifically designed for small busi-
nesses and offices, 3Com OfficeConnect
traffic. OfficeConnect Dual Speed
Ethernet switches and hubs feature
®
®
switches and hubs provide businesses autosensing technology, allowing
with an integrated system of small-
office networking. By installing a
users to migrate to higher speeds
when needed. They are available in a
LAN, users can work more effectively variety of port densities—from 4 to
with file and print sharing and reduce 16 ports.
costs by sharing expensive resources
OfficeConnect switches and hubs are a
as printers.
core part of the OfficeConnect family,
OfficeConnect products provide con-
providing small businesses with the
nectivity for every business need. For power to share information, set up
the value-conscious user, standard
Ethernet hubs are ideal, while Fast
Ethernet switches and hubs provide
additional speed for high-volume
powerful, comprehensive servers,
connect remote offices, and access
the Internet.
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OFFICECONNECT® SWITCHES AND HUBS
3Com recommends using Category 5
cables and that the cable (B) between
the Fast Ethernet hub is not longer
than 5 m (16.4 ft). This allows the
maximum hub-to-workstation cable
length (A or C) of 100 m (328 ft) to be
used, as shown.
Fast Ethernet
Fast Ethernet is based on the Ethernet
standard yet runs at 10 times the speed
(100 Mbps). It is now one of the most
popular high-speed technologies because
of its cost effectiveness, stability, and
compatibility with existing Ethernet
LAN environments. Fast Ethernet
switching allows dedicated performance
between two devices.
The total length of cable (A+B+C
below) between two workstations
and a nonrepeater piece of equipment
(such as a switch) must not exceed
205 m (672 ft). Each cable (A, B, or C)
must not exceed 100 m (328 ft).
100 Mbps link
Example:
These rules do not
apply to Fast
Ethernet switches.
100 m
(328 ft)
You can connect
as many
OfficeConnect
switches together
as your business
requires.
5 m
(16.4 ft)
B
100 m
(328 ft)
A
C
3
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OFFICECONNECT® SWITCHES AND HUBS
OfficeConnect Dual Speed Switches
allow dedicated, high-speed connec-
tions at either 10BASE-T or 100BASE-
TX, making them ideal for connecting
servers or multiple hubs in small
businesses or offices and providing a
flexible migration path. They provide
expandable connections for 5, 8, or
16 users or networked devices.
OfficeConnect Dual Speed
Switches
OfficeConnect Dual Speed Switches
are designed for small businesses that
want high network performance to
exchange larger data files and images,
and access real-time information.
OfficeConnect Dual Speed Switch 16
OfficeConnect
Dual Speed Switches
10/100
autosensing memory
ports
Buffer
Autonegotia- LED
ting full- and indicators
half-duplex
Priority
queuing
MAC
addresses
supported
MDI/MDIX
Forwarding
method
Telephone
support and
lifetime
FCC Class B External
power
supply
ports
limited
warranty
OfficeConnect Dual Speed Switch 5
(3C16790)
A low port density, high-performance,
Fast Ethernet switch ideal for boosting
network performance with multiple hub
aggregation or server connection.
5
1 M
1 M
2 M
All 5
All 8
All 16
Alert, Power,
ꢀ
ꢀ
1,024
1,024
2,048
Auto
Store &
Forward
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
11 W
Duplex, Port
status (activity,
connection
speed)
OfficeConnect Dual Speed Switch 8
(3C16791)
A popular switch ideal for connecting
servers, multiple hubs, or desktops for
small businesses that use bandwidth-
intensive applications.
8
Alert, Power,
Duplex, Port
status (activity,
connection
speed)
Auto
Store &
Forward
11 W
OfficeConnect Dual Speed Switch 16
(3C16735B)
16
Alert, Power,
Activity,
Manual
Store &
Forward
14.4 W
Provides high-performance switching
for bandwidth-intensive applications.
Duplex,
Speed
the flexibility to connect devices at
either speed—automatically assigning
power where possible and offering a
smooth transition from 10 Mbps to
100 Mbps.
OfficeConnect Dual Speed Hubs
The OfficeConnect family of dual
speed hubs provides full 100 Mbps
performance and is designed for small
businesses that want more performance
from their network. This family of
hubs delivers quick exchange of data
between PCs and swift downloading
from the network. OfficeConnect
Dual Speed Hubs feature 10/100
Each hub features plug-and-play
OfficeConnect Dual Speed Hub 16
installation, requires no configuration,
has an easy-to-read, front-panel dis-
play with diagnostic LEDs. All hubs
are backed by 3Com’s lifetime limited
warranty and 90-day telephone support.
autosensing technology and provide
OfficeConnect
Dual Speed Hubs
10/100
autosensing
ports
LED indicators
MAC addresses
supported
MDI/MDIX
port
Telephone
FCC Class B
External
power supply
support and
lifetime limited
warranty
OfficeConnect Dual Speed Hub 8
(3C16750B)
A popular hub combining Fast Ethernet
performance with the flexibility to expand
8
Alert, Power,
Network
utilization,
Port status,
Collision
1,024
1,024
ꢀ
ꢀ
ꢀ
ꢀ
14.4 W
14.4 W
an existing Ethernet network to Fast Ethernet.
OfficeConnect Dual Speed Hub 16
(3C16751B)
16
Alert, Power,
Network
ꢀ
ꢀ
Ideal for Fast Ethernet connectivity with
the flexibility to expand an existing Ethernet
network to Fast Ethernet.
utilization,
Port status,
Collision
4
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OFFICECONNECT® SWITCHES AND HUBS
want to add additional users to a
10BASE-T network. OfficeConnect
hubs offer compatibility with legacy
coax networks and provide connections
for 4, 8, or 16 users or networked
devices.
OfficeConnect Ethernet Hubs
The OfficeConnect family of Ethernet
hubs is specifically designed for small
businesses with basic networking
requirements, such as file or periph-
eral sharing, or for those who simply
OfficeConnect Ethernet Hub 8
OfficeConnect
Ethernet Hubs
10BASE-T
RJ-45
10BASE-T
coax
10BASE-T AUI LED indicators Network
MDI-MDIX
port
Telephone
FCC Class B
External
power
supply
utilization
(LED)
support and
lifetime lim-
ited warranty
OfficeConnect Ethernet Hub 4 (3C16704A)
A low-cost, entry-level hub, providing basic
Ethernet connectivity.
4
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
11 W
11 W
11 W
11 W
11 W
OfficeConnect Ethernet Hub 4C (3C16703A)
Ideal for entry-level networks requiring
alternative media connectivity.
4
1
1
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
OfficeConnect Ethernet Hub 8 (3C16700A)
A popular entry-level hub providing basic
Ethernet connectivity.
8
OfficeConnect Ethernet Hub 8C (3C16701A)
Ideal hub for businesses wanting to expand their
existing coaxial network.
8
1
1
ꢀ
ꢀ
OfficeConnect Ethernet Hub 16C (3C16702A)
Provides expanded network capacity and
connectivity to legacy coaxial networks.
16
5
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OFFICECONNECT® SWITCHES AND HUBS
OfficeConnect Switches and Hubs Features
10/100 autosensing ports
Allows users to connect at either 10 Mbps or 100 Mbps to the switch or hub. The
switch or hub will operate at the highest speed possible, optimizing network per-
formance and user flexibility.
Alert LED
A unique LED present on all OfficeConnect switches and hubs provides additional
diagnostic information.
Auto MDI/MDIX
This feature, available on new OfficeConnect Dual Speed Switch 5 (3C16790) and
Switch 8 (3C16791), eliminates most common cabling problems (see MDI/MDIX
push button switch).
Compact and clippable design New, one-piece clipping system lets users connect up to four units in a stack.
External power supply
Provides more flexibility and reduces power requirements in the product, eliminating
the need for a noisy fan.
FCC Class B
Indicates that a product is certified for use in domestic as well as office environments
(more stringent classification than Class A).
Fully compatible with leading OfficeConnect units support Novell NetWare, Microsoft Windows 95, 98, 2000,
operating systems
Windows NT, and other leading software systems, giving the widest range of back-
ward compatibility with existing office software.
Full duplex (switches only)
Automatically doubles the throughput (to 20 Mbps or 200 Mbps) when ports are
connected to other full-duplex devices or ports.
Lifetime limited warranty and Provides complete piece of mind.
telephone support
MDI/MDIX push button switch Enables direct connection to a server, end station, or another switch or hub, using
regular straight-through cables.
Network utilization meter
(available on most
Indicates how much of the network bandwidth is in use. These LEDs are continually
updated to show when the network needs more bandwidth.
OfficeConnect hubs)
Priority queuing
(OfficeConnect Dual Speed
Switches 5 and 8)
Ensures that real-time applications (such as audio or video) take priority so they can
run effectively, even during bursts of high traffic load.
OfficeConnect LED Indicators
Alert LED
Port Status LEDs
(Orange)
(Green/Yellow) Indicate the status
of each port. If green, there is a
link present at 100 Mbps. If
yellow, there is a link present at
10 Mbps. If the LED is off,
nothing is connected. Flashing
of an LED indicates activity
over that link.
Alerts you to
excessive
network use
or an isolated
(partitioned)
10BASE-T and
100BASE-TX
port.
Duplex Indicator
(Orange) If the LED is
orange, the link is
running at full duplex.
If the LED is off but
there is a link on that
port, that link is
As this front view of the
OfficeConnect Fast Ethernet Hub
8 illustrates, each OfficeConnect
unit offers a variety of LED
indicators, including an Alert
LED to allow quick monitoring
of hub and network activity.
The Alert LED gives users
Power LED
(Green) Indicates
that the power
supply to the
unit is present.
running at half duplex.
immediate notification of
problems, such as excessive
network use, without requiring
special technical knowledge.
6
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OFFICECONNECT® SWITCHES AND HUBS
OfficeConnect Ethernet Hub 8C (10BASE-T Hub)
3C16701A
OfficeConnect Hubs
OfficeConnect hubs come with a user guide, power
adapter, one-piece clipping system, and rubber feet.
Specifications
Connectors:
8 RJ-45 ports for 10BASE-T twisted pair; one BNC
port for 10BASE2 thin Ethernet (50 ohm)
OfficeConnect Ethernet Hub 4 (10BASE-T Hub)
3C16704A
Dimensions:
Connectors:
Width: 228 mm (9.1 in)
Height: 41.8 mm (1.6 in)
Depth: 135.4 mm (5.3 in) + 15.2 mm (0.6 in) for
coaxial port
4 RJ-45 ports for 10BASE-T twisted pair
Dimensions:
Width: 228 mm (9.1 in)
Height: 41.8 mm (1.6 in)
Depth: 135.4 mm (5.3 in)
Weight: 500 g (1.1 lb)
Weight: 550 g (1.2 lb)
Power: 11 VA
Functional:
ISO 8802/3; IEEE 802.3; EMC; EN 55022 Class B;
EN 55024; EN 61000-3-2, EN 61000-3-3; FCC Part
15 Class B; ICES-003 Class B; VCCI Class B; AS/NZS
3548 Class B
Power: 11 VA
Functional:
ISO 8802/3; IEEE 802.3; EMC; EN 55022 Class B;
EN 55024; EN 61000-3-2, EN 61000-3-3; FCC Part
15 Class B; ICES-003 Class B; VCCI Class B; AS/NZS
3548 Class B
Environmental: EN 60068 (IEC 68)
Safety:
UL 1950; EN 60950; CSA 22.2 #950, IEC 950
Environmental: EN 60068 (IEC 68)
Safety:
OfficeConnect Ethernet Hub 16C (10BASE-T hub)
3C16702A
UL 1950; EN 60950; CSA 22.2 #950, IEC 950
Connectors:
OfficeConnect Ethernet Hub 4C (10BASE-T Hub)
3C16703A
16 RJ-45 ports for 10BASE-T twisted pair; one
BNC port for 10BASE2 thin Ethernet (50 ohm)
Connectors:
4 RJ-45 ports for 10BASE-T twisted pair; one BNC
port for 10BASE2 thin Ethernet (50 ohm); one AUI
Dimensions:
Width: 228 mm (9.1 in)
Height: 60.6 mm (2.4 in)
Depth: 185.4 mm (7.3 in)
Weight: 960 g (2.1 lb)
Dimensions:
Width: 228 mm (9.1 in)
Height: 41.8 mm (1.6 in)
Depth: 135.4 mm (5.3 in)
Weight: 500 g (1.1 lb)
Power: 11 VA
Functional:
ISO 8802/3; IEEE 802.3; EMC; EN 55022 Class B;
EN 55024; EN 61000-3-2, EN 61000-3-3; FCC Part
15 Class B; ICES-003 Class B; VCCI Class B; AS/NZS
3548 Class B
Power: 11 VA
Functional:
ISO 8802/3; IEEE 802.3; EMC; EN 55022 Class B;
EN 55024; EN 61000-3-2, EN 61000-3-3; FCC Part
15 Class B; ICES-003 Class B; VCCI Class B; AS/NZS
3548 Class B
Environmental: EN 60068 (IEC 68)
Safety:
UL 1950; EN 60950; CSA 22.2 #950, IEC 950
Environmental: EN 60068 (IEC 68)
Safety:
OfficeConnect Dual Speed Hub 8 (10BASE-T/
100BASE-TX Hub) 3C16750B
UL 1950; EN 60950; CSA 22.2 #950, IEC 950
Connectors:
OfficeConnect Ethernet Hub 8 (10BASE-T Hub)
3C16700A
8 RJ-45 10BASE-T/100BASE-TX ports
Connectors:
Dimensions:
8 RJ-45 ports for 10BASE-T twisted pair
Width: 228 mm (9.1 in)
Height: 60.6 mm (2.4 in)
Depth: 185.4 mm (7.3 in)
Weight: 960 g (2.1 lb)
Dimensions:
Width: 228 mm (9.1 in)
Height: 41.8 mm (1.6 in)
Depth: 135.4 mm (5.3 in)
Weight: 500 g (1.1 lb)
Power: 33 VA
Functional:
ISO 8802/3; IEEE 802.3; EMC; EN 55022 Class B;
EN 55024; EN 61000-3-2, EN 61000-3-3; FCC Part
15 Class B; ICES-003 Class B; VCCI Class B; AS/NZS
3548 Class B
Power: 11 VA
Functional:
ISO 8802/3; IEEE 802.3; EMC; EN 55022 Class B;
EN 55024; EN 61000-3-2, EN 61000-3-3; FCC Part
15 Class B; ICES-003 Class B; VCCI Class B; AS/NZS
3548 Class B
Environmental: EN 60068 (IEC 68)
Safety:
UL 1950; EN 60950; CSA 22.2 #950, IEC 950
Environmental: EN 60068 (IEC 68)
Safety:
UL 1950; EN 60950; CSA 22.2 #950, IEC 950
7
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OFFICECONNECT® SWITCHES AND HUBS
OfficeConnect Dual Speed Hub 16 (10BASE-T/
100BASE-TX Hub) 3C16751B
OfficeConnect Dual Speed Switch 8 (10BASE-T/
100BASE-TX Hub) 3C16791
Specifications (continued)
Connectors:
Connectors:
16 RJ-45 10BASE-T/100BASE-TX ports
8 RJ-45 10BASE-T/100BASE-TX ports
Dimensions:
Dimensions:
Width: 228 mm (9.1 in)
Height: 60.6 mm (2.4 in)
Depth: 185.4 mm (7.3 in)
Weight: 1000 g (2.2 lb)
Width: 228 mm (9.1 in)
Height: 41.8 mm (1.6 in)
Depth: 135.4 mm (5.3 in)
Weight: 600 g (1.3 lb)
Power: 53 VA
Power: 11 VA
Functional:
Functional:
ISO 8802/3; IEEE 802.3; EMC; EN 55022 Class B;
EN 55024; EN 61000-3-2, EN 61000-3-3, FCC Part
15 Class B; ICES-003 Class B; VCCI Class B; AS/NZS
3548 Class B
ISO 8802/3; IEEE 802.3; EMC; EN 55022 Class B;
EN 55024; EN 61000-3-2, EN 61000-3-3, FCC Part
15 Class B; ICES-003 Class B; VCCI Class B; AS/NZS
3548 Class B
Environmental: EN 60068 (IEC 68)
Safety:
Environmental: EN 60068 (IEC 68)
Safety:
UL 1950; EN 60950; CSA 22.2 #950, IEC 950
UL 1950; EN 60950; CSA 22.2 #950, IEC 950
OfficeConnect Switches
OfficeConnect Dual Speed Switch 16 (10BASE-T/
100BASE-TX Hub) 3C16735B
OfficeConnect switches come with a user guide,
power adapter, one-piece clipping system, and
rubber feet.
Connectors:
8 RJ-45 10BASE-T/100BASE-TX ports
Dimensions:
OfficeConnect Dual Speed Switch 5 (10BASE-T/
100BASE-TX Hub) 3C16790
Width: 228 mm (9.1 in)
Height: 60.6 mm (2.4 in)
Depth: 185.4 mm (7.3 in)
Weight: 1,000 g (2.2 lb)
Connectors:
5 RJ-45 10BASE-T/100BASE-TX ports
Dimensions:
Power: 13.2 VA
Width: 228 mm (9.1 in)
Height: 41.8 mm (1.6 in)
Depth: 135.4 mm (5.3 in)
Weight: 600 g (1.3 lb)
Functional:
ISO 8802/3; IEEE 802.3; EMC; EN 55022 Class B;
EN 55024; EN 61000-3-2, EN 61000-3-3, FCC Part
15 Class B; ICES-003Class B; VCCI Class B; AS/NZS
3548 Class B
Power: 11 VA
Functional:
Environmental: EN 60068 (IEC 68)
Safety:
ISO 8802/3; IEEE 802.3; EMC; EN 55022 Class B;
EN 55024; EN 61000-3-2, EN 61000-3-3, FCC Part
15 Class B; ICES-003 Class B; VCCI Class B; AS/NZS
3548 Class B
UL 1950; EN 60950; CSA 22.2 #950, IEC 950
Environmental: EN 60068 (IEC 68)
Safety:
UL 1950; EN 60950; CSA 22.2 #950, IEC950
OfficeConnect Dual Speed Switch 5
OfficeConnect Dual Speed Switch 8
OfficeConnect Dual Speed Switch 16
OfficeConnect Dual Speed Hub 8
OfficeConnect Dual Speed Hub 16
OfficeConnect Ethernet Hub 4
OfficeConnect Ethernet Hub 4C
OfficeConnect Ethernet Hub 8
OfficeConnect Ethernet Hub 8C
OfficeConnect Ethernet Hub 16C
3C16790
3C16791
Ordering Information
3C16735B
3C16750B
3C16751B
3C16704A
3C16703A
3C16700A
3C16701A
3C16702A
3Com Corporation, Corporate Headquarters, 5400 Bayfront Plaza, P.O. Box 58145, Santa Clara, CA 95052-8145
bol COMS.
Copyright © 2001 3Com Corporation. All rights reserved. 3Com and OfficeConnect are registered trademarks of 3Com
Corporation. The 3Com logo is a trademark of 3Com Corporation. Windows and Windows NT are trademarks of
Microsoft. NetWare is a trademark of Novell. All other company and product names may be trademarks of their respec-
tive companies. All specifications are subject to change without notice.
Printed in the U.S.A.
400317-012 04/01
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