Transition Networks E-TBT-HB-1002 User manual

24 Port 10BaseT Ethernet Hub
Model E-TBT-HB-1002
Users Manual
Manual #7306
Specifications
Warranty: 2 years
Power Supply: Internal Power Supply, Input AC 100 -
250 VAC, 47 - 63 Hz, 40W Max
Environment: 0 - 70˚C, 5% - 90% humidity non-con-
densing, 0 - 10,000 ft. altitude
Dimensions: Free standing (rack mount adapters
included) 19" W x 6.25" D x 3.4" H
Desk top - 17" W x 6.25" D x 3.4" H
Accessories: Rack mounting tabs included for stand-
ard 19" wall racks
Rubber feet for free standing
Safety Approvals: UL Listed
C-UL Approved (Canadian Safety)

Table of Contents
Introduction........................................................................ 1
About 10BaseT (twisted pair) Topology...........................1
24 port Ethernet Hub Options ......................................... 2
Redundancy Feature......................................................... 2
Using Shielded Twisted Pair Wire.....................................3
Hub Views........................................................................... 3
Hub Reset Switch............................................................... 3
LED's................................................................................... 4
Redundancy Switch........................................................... 4
Rules for Configuring Your Network................................ 4
Table 1.....................................................................13
Figure 7...................................................................14
Twisted pair wiring............................................................. 7
Figure 2.................................................................... 9
Optional Slide In Cards..................................................... 9
Figures 4-6.............................................................. 11
Troubleshooting your Installation...................................12
Fuse Information...............................................................15
Approved European Power Cord Set Information...15&16
FCC Statement.................................................................. 17
Canadian Statement......................................................... 17
Technical Support............................................................ 17
Specifications................................................................... 18
Rack Mounting Tabs.........................................................18
FCC Regulations
NOTE: This equipment has been tested and found to com-
ply with the limits for a Class A digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to pro-
vide reasonable protection against harmful interference
when the equipment is operated in a commercial environ-
ment. This equipment generates, uses, and can radiate
radio frequency energy and if not used in accordance with
the instruction manual, may cause harmful interference to
radio communications. Operation of this equipment in a res-
idential area is likely to cause harmful interference in which
case the user will be required to correct the interference at
his own cost.
Canadian Regulations
NOTE: This digital apparatus does not exceed the Class A
limits for radio noise for digital apparatus set out on the
Radio Interference Regulations of the Canadian Department
of Communications.
Technical Support
For more information about this product or other TRANSI-
TION Networks products, call your local TRANSITION
Networks distributor, or contact us by telephone at (612)
941-7600 or fax [phone].
Trademarks
Ethernet is a registered trademark of Xerox Corporation.

TRANSITION Networks, Inc.
24 Port 10BaseT Ethernet Hub
Model E-TBT-HB-1002
Installation Manual
Introduction
The 24 port 10BaseT Ethernet hub, Model E-TBT-HB-1002,
is an Ethernet repeater that provides an economical and
efficient networking system. It is rack mountable and is
designed to meet the IEEE 802.3 10BaseT standards.
Several repeaters can be cascaded together via
thicknet/thinnet coaxial cable, fiber optic cable and/or twist-
ed pair cable to build a large Ethernet network. The 24 port
hub allows simple installation and expansion flexibility for
your future networking requirements.
About 10BaseT (twisted pair) Topology
The IEEE 802.3 10BaseT specification is defined as
Ethernet across twisted pair wire. This new technology for
Ethernet (across twisted pair wire) represents a step forward
in network cabling and management. Since 10BaseT uti-
lizes twisted pair wire, the cost of networking is considerably
less expensive than using coaxial cables. It is also much
easier to install since it uses RJ-45 modular connectors.
Ethernet thick and thin (coax) networks are designed in a
linear “bus” or “daisy chain” topology where 10BaseT (twist-
ed pair) networks are designed in a “star” type topology. In
a “star” topology the hub is located in the center of the con-
figuration, with the individual nodes connected to the hub,
spread out like spokes on a wheel. In a linear or “bus”
topology, if you disconnect a device or accidentally open a
Table 3: Approved European Power Cord Set Information
Alternate Markings
Surface Utilizing
Printed or Embossed black-red-yellow
Harmonization (thread length/mm)
Approval Organization Marking Black Red Yellow
Belgium: Comite Electro- CEBEC-HAR 10 30 10
technique Beige (CEBEC)
Verband Deutscher Elektro- VDE-HAR 30 10 10
techniker (VDE)e, V., Prufstelle
Technique de l'Electricite (UTE) UTE-HAR 30 30 10
Institute del Marchio Qualita IEMMEQU-HAR 10 30 50
British Approvals Service for BASEC-HAR 10 10 30
Electric Cables (BASEC)
N.V. tot Keuring van Electro- KEMA-KEUR-HAR 10 30 30
technische Matarialien (KEMA)
Svenska Elecktriska (SMEKO) SEMKO-HAR 10 10 50
Osterreichnischer Verband fur OVE-HAR 30 10 50
Electrotechnik (OVE)
Danmarks Elektriske (DEMKO) DEMKO-HAR 30 10 30
Materielkontroll
Institute for Industrial (IIRS) IIRS-HAR 30 30 50
Research and Standards
Norges Elektriske (NEMKO) NEMKO-HAR 10 10 70
Materielkontroll
National Standards Authority NSAI-HAR 30 30 50
of Ireland (NSAI)

you would inadvertently disconnect users from your network.
With a “star” topology this cannot happen, each node is iso-
lated from each other, making the network much easier to
control and manage. The 24 twisted pair ports are designed
for 24 or 26 AWG twisted pair cable (meeting IEEE stan-
dards).
About the TRANSITION Networks 24 port Ethernet Hub
The TRANSITION Networks Model E-TBT-HB-1002 hub is a
free standing or rack mountable multiport repeater with 24
modular RJ-45 connections. In addition, an AUI port (DB-15
connector) is provided for another Ethernet interface.
Included are two expansion slots for optional Slide In Cards;
providing coaxial cable, fiber optic and twisted pair Ethernet
connections.
*E-CX-SIC Coaxial cable interface slide in card
*E-FRL-SIC Fiber optic interface slide in card
*E-TBT-SIC Twisted pair interface slide in card
These optional cards allow extended interface capabilities;
providing greater flexibility for your network's present or
future needs.
Redundancy Feature
A special feature of the TRANSITION Networks 24 port hub
is the Redundancy feature that allows dual connections
when cascading hubs. This feature insures that if one line
fails between hubs, another line provides transmission auto-
matically. If both lines fail, a fault light on the front panel
indicates trouble. The Redundancy feature requires the
switch enabled (on side of the hub) and both optional Slide
in Card ports be utilized. Either twisted pair or fiber optic
The following are network topology constraints that apply to
10BaseT as well as mixed media networks containing
10BaseT segments.
1) Repeater sets are required for all segment interconnec-
tion.
2) MAUs that are part of repeater sets count towards the
maximum number of MAUs on a segment.
3) The transmission path permitted between any two DTEs
may consist of up to five segments: four repeater sets
(including optional AUIs), two MAUs and two AUIs.
4) When a network consists of four repeater sets and five
segments, up to three of the segments may be coax and the
remainder must be Link segments. When five segments are
present, each FOIRL Link segment should not exceed 500
meters.
5) When a network path consists of three repeater sets and
four segments, the maximum allowable length of the FOIRL
segments is 1000 meters each as specified.
Fuse Information and Approved European Power Cord
Sets
AC Inlet Fuse Information:
For installing new fuses, open the fuse cover using a small
blade screw driver or similar tool.
Warning:For continued protection against risk of
fire, replace only with the same type of fuse.
Note: For replacement of North American style
fuse, replace with 1/4 x 1 1/4 inch 250 V, 2 Amp,
UL listed fuse.
For European replacement style fuses, replace
with 5 x 20 mm, 250 Volt, 2 Amp fuses.

may be used. Note: Coax slide in card (E-CX-SIC) may
not be used for redundancy connection.
Shielded RJ-45 Connectors/Twisted pair wire
The 24 port hub is provided with shielded RJ-45 Modular
connectors to meet European requirements. To fully utilize
shielding capability, use AMP shielded male modular RJ-45
connectors; tying cable shield to the shielded connector.
You may use shielded or unshielded 24 or 26 AWG twisted
pair wire without loss of transmission distance. The maxi-
mum distance between the hub and a network device is 100
meters (330 feet). The use of flat cable (silver satin) patch
cables are not recommended and may affect the system’s
overall performance.
Power
123 56784
9
10
11
12 13
14
15 16 17
18
19 20
21 22
23
24
UnitI.D.
10BaseT Hub 1002
1
3
57
9
11
1315
17
19
2123
2
4
68
12
1416
18
20
22
2410
1
2
Link
RearSlot
Enabled
Fault
Power
123 56784
9
10
11
12 13
14
15 16 17
18
19 20
21 22
23
24
UnitI.D.
10BaseT Hub 1002
1
3
57
9
11
1315
17
19
2123
2
4
68
12
1416
18
20
22
2410
1
2
Link
RearSlot
Enabled
Fault
Power
123 56784
9
10
11
12 13
14
15 16 17
18
19 20
21 22
23
24
UnitI.D.
10BaseT Hub 1002
1
3
57
9
11
1315
17
19
2123
2
4
68
12
1416
18
20
22
2410
1
2
Link
RearSlot
Enabled
Fault
Power
123 56784
9
10
11
12 13
14
15 16 17
18
19 20
21 22
23
24
UnitI.D.
10BaseT Hub 1002
1
3
57
9
11
1315
17
19
2123
2
4
68
12
1416
18
20
22
2410
1
2
Link
RearSlot
Enabled
Fault
Power
123 56784
9
10
11
12 13
14
15 16 17
18
19 20
21 22
23
24
UnitI.D.
10BaseT Hub 1002
1
3
57
9
11
1315
17
19
2123
2
4
68
12
1416
18
20
22
2410
1
2
Link
RearSlot
Enabled
Fault
A
B
1
2
3
4
5
6
Power
123 56784
9
10
11
12 13
14
15 16 17
18
19 20
21 22
23
24
UnitI.D.
10BaseT Hub 1002
1
3
57
9
11
1315
17
19
2123
2
4
68
12
1416
18
20
22
2410
1
2
Link
RearSlot
Enabled
Fault
Power
123 56784
9
10
11
12 13
14
15 16 17
18
19 20
21 22
23
24
UnitI.D.
10BaseT Hub 1002
1
3
57
9
11
1315
17
19
2123
2
4
68
12
1416
18
20
22
2410
1
2
Link
RearSlot
Enabled
Fault
Power
123 56784
9
10
11
12 13
14
15 16 17
18
19 20
21 22
23
24
UnitI.D.
10BaseT Hub 1002
1
3
57
9
11
1315
17
19
2123
2
4
68
12
1416
18
20
22
2410
1
2
Link
RearSlot
Enabled
Fault
Power
123 56784
9
10
11
12 13
14
15 16 17
18
19 20
21 22
23
24
UnitI.D.
10BaseT Hub 1002
1
3
57
9
11
1315
17
19
2123
2
4
68
12
1416
18
20
22
2410
1
2
Link
RearSlot
Enabled
Fault
Power
123 56784
9
10
11
12 13
14
15 16 17
18
19 20
21 22
23
24
UnitI.D.
10BaseT Hub 1002
1
3
57
9
11
1315
17
19
2123
2
4
68
12
1416
18
20
22
2410
1
2
Link
RearSlot
Enabled
Fault
Power
123 56784
9
10
11
12 13
14
15 16 17
18
19 20
21 22
23
24
UnitI.D.
10BaseT Hub 1002
1
3
57
9
11
1315
17
19
2123
2
4
68
12
1416
18
20
22
2410
1
2
Link
RearSlot
Enabled
Fault
A
B
1 2
3
4
5
FIG 7: FIVE SEGMENT RULE
Model 1002 Hub Views: Figure 1
2A, 250V
Caution: For continued protection against
risk of fire, replace only with same type and
rating of fuse. 250V, 2A
SIC SLOT 1 SIC SLOT 2
USE ONLY WITH
250V FUSES
DISCONNECT POWER
BEFORE REPLACING FUSES
AUI
Power
12 3 5 6 784 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Unit I.D.
10BaseT Hub 1002
1 3579 11 13 15 17 19 21 23
2468 12 14 16 18 20 22 2410
1
2
Link
Rear Slot
Enabled
Fault
24 PORT HUB FRONT VIEW
24 PORT HUB REAR VIEW
Reset Hub
Rear Port Configuration:
Normal AUI Operation
Redundancy Enabled
24 PORT HUB SIDE VIEW
Attention: Couper le courant avant de
replacer le fusible
Hub Reset Switch
The Hub Reset switch is used if the hub locks up or a mal-
function occurs. This switch is located on the side of the
hub.

AUI (DB-15 female D-Sub) Connector
The AUI connector provides another port for connecting to a
network via a transceiver or for cascading hubs. NOTE:
Do not cascade hubs together with an AUI cable! If
attaching a transceiver through an AUI cable, use only IEEE
approved Ethernet AUI cables. Maximum distance for an
AUI cable is 50 meters (150’).
Rules For Configuring Your Network
Follow these rules when configuring your network:
* When connecting multiple hubs together on a backbone,
you can use the AUI port of your hub; utilizing a transceiver
(TN models E-CX-MC02, 03, 04 and 05) to attach to the
backbone. A thicknet or thinnet backbone will allow you to
run longer distances between hubs and provide better noise
immunity because the cable is shielded. In addition, fiber
Table 2
Media Maximum Maximum Minimum Maximum
Segment Number Segment Medium Medium
Type MAUs per Length Propagation Delay per
Segment (meters) Velocity* Segment
(nano/sec)
Coax
10Base5 100 500 0.77 c 2165
10Base2 30 185 0.65 c 950
Link
FOIRL 2 1000 0.66 c 5000
10BaseT 2 100*** 0.59 c 1000
AUI**1 DTE/MAU 50 0.65 c 257
*c = 3 x 10 to the 8th power, expressed in meters/second
**AUI connection is not a segment
*** Maximum segment length depends on the cable characteristics
Hub LED’s
The 24 port Ethernet hub provides Power, Link, Fault and
Rear Slot Enabled LED’s, for monitoring convenience.
Power is indicated after the unit is plugged into any AC out-
let (100-240 VAC, 50-60 Hz) and with the rear power switch
turned on. Link indicates the hub is receiving link pulses
from a 10BaseT compliant device. Fault LED indicates the
redundancy feature has failed and is not functioning. Rear
Slot Enabled indicates which optional slots are active when
the redundancy feature is utilized.
Redundancy Switch
The redundancy switch is also located on the hub’s side and
is used for the redundancy feature utilizing the optional slide
in cards. Both slots must be installed with any combination
of fiber optic or twisted pair slide in cards.
cable. Use only IEEE approved AUI cables. Check
the connections.
* The network interface card is improperly configured.
Refer to users manual; verify proper configuration.
* Another network device is disrupting communica-
tions of the device your are trying to bring on line.
Remove that device and troubleshoot the problem on
that line.
Integrating Ethernet IEEE 802.3 Compatible Hardware
This information provides guidelines for integrating 10BaseT
and non-10BaseT compatible hardware for use with the 24
port Ethernet hub in your network. The following table sum-
marizes the delays for the various network media segments.

optic connection between two hubs can be provided
through fiber optic transceivers (TN model E-FRL-MC01)
connected to the AUI port.
* Do not cascade hubs directly together with an AUI cable.
* When cascading hubs via twisted pair, a cross over cable
is required (see section on cascading hubs).
* Be sure your network configuration does not exceed the
maximum distance and MAU limitations set forth by the
10BaseT standards. Refer to IEEE 802.3 specifications or
check with a professional network installer.
* When connecting your network devices to the hub via
twisted pair cable, the maximum twisted pair length is 100
meters (330 feet) and is equal to one segment. Use a
straight through cable assembly.
* Choose a centrally located area for the hub installation.
Separate Data and Voice transmission lines. Use only a
dedicated cable, per device to prevent crosstalk. Utilize
level 4 cable or better.
* The text of this manual assumes that the reader is familiar
with network systems in general.
Choosing an Installation Location
The installation location you choose must have the following:
* An AC power outlet (100-240 VAC, 50-60 Hz) for the hub’s
power cord connection.
* Suitable rack space to mount the hub for proper ventilation.
Troubleshooting Your Installation
The first step after the wiring has been installed is to con-
nect two devices (such as the file server and a workstation)
to the hub to see if they will communicate with each other.
Use your operating system software to locate each device.
When you have verified that they communicate correctly,
you can continue to connect other network devices to the
hub.
If the two network devices do not communicate, or any addi-
tional device after the initial test, follow the procedures listed
below.
1) Check the LINK indication on the front panel. If not lit,
LINK has not been established.
2) Bypass the building wiring and test directly using test
cables between the hub, workstation and server.
3) Verify that the individual devices are Ethernet compatible
and can communicate with each other.
4) Examples of common internal wiring problems found:
* The internal (building or premise) wiring is not prop-
erly configured (punch down blocks, wall jacks, patch
cables).
* Flat or “silver satin”telephone wire used for patch
and line cords. These may have reverse pinning,
replace and use level 4 grade cable.
* The maximum distance from a hub to network
device cannot exceed 100 meters (330 feet).
5) Examples of common network problems:

* An environment within the requirements for the product as
described on page 18.
* The hub or twisted pair wiring IS NOT located close to any
sources of electrical noise (such as radio transmitters and
broadband amplifiers, motors, high power electrical lines,
unshielded data cables, and fluorescent light fixtures).
* The twisted pair cable does not run in the same conduit
with power lines or other data cables.
* Phone lines should be separated from data cables.
Utilizing Existing Twisted Pair Wiring
You may be able to use the existing twisted pair wiring in
your installation. Determine the following:
* Identify the manufacturer of the twisted pair wire installed
in the building(s). If identifiable, contact the manufacturer
(or distributor/installer) and have them send you the wire
specifications or have them determine if the cable meets the
10BaseT requirements listed on page 7.
* Make sure the cable run is in a star configuration and all of
the cables are run to a central location which is easily
accessible.
* In your central location, look at your punch down blocks
and bridging panels. Make sure the wiring used is not
“Straight or Flat telephone wire”. This must be replaced with
twisted pair wire.
* After you have determined that your cable meets the
requirements for 10BaseT, you may install an RJ-45 jack at
each location for a network device. FIG 6: HUB CASCADING VIA TRANSCEIVERS ON AUI
HUB CASCADING VIA FRONT CONNECTORS
FIG 4: HUB CASCADING VIA FRONT CONNECTORS
FIG 5: HUB CASCADING VIA SLIDE IN CARD
BNC "T" and terminator
required.

Make sure there are no double lines or branches punched
down together. The system may work for a while, but the
non-connected branch will act like an antenna (picking up
unwanted noise) and slow down the network. Eliminate any
branches.
Installing New Twisted Pair Wire
If the existing wire in your building(s) does not meet IEEE
802.3 specifications, you may want to install new wiring. If
you have a noisy (electrical noise) environment, you may
select shielded twisted pair wire. If shielded twisted pair
wire is used, the shield may be connected to chassis ground
through the shielded modular RJ-45 Amp connector (see
page 3).
Wiring Specifications
Twisted Pair Media
The cabling between nodes on the network must be twisted
pair cable. Shielded twisted pair is also available. The
physical characteristics must meet or exceed those set forth
by the IEEE 802.3 10BaseT specifications. Generally, Level
4 wire or better is recommended. The cable must have a
minimum of 2 pairs of twisted 22-26 AWG wire. “Flat or
Straight”wire is not recommended.
-Gauge 22 to 26 AWG
-Attenuation Less than 11.5 dB
between 5 and 10 MHz
-Differential Characteristic 85 to 110 Ω@ 10 MHz
Impedance
-Maximum Distance 100 Meters (330 Feet)*
Cascading Hubs
Ethernet hubs may be cascaded together to support larger
networks. When cascading the 24 port hub to another
Ethernet hub, a crossover cable is required (See page 9 for
pinning instructions). Also, when cascading via the optional
Slide In Card (E-TBT-SIC), or cascading through trans-
ceivers connected to AUI ports, a crossover cable is
required. Note: Do not cascade hubs via AUI ports with an
AUI cable.
FIG 3: SIC CARD INSTALLATION VIEW
Slide in Card Indicator Lights
E-CX-SIC Power indication only
E-FRL-SIC Power and Link indication
E-TBT-SIC Power and Link indication
The Slide In Cards are installed in the rear of the hub and
can only be installed one way. If seated properly, the power
indicator LED will light. When Link has been established,
the Link LED will light on the E-FRL-SIC and E-TBT-SIC
cards. See Figure 3 below:

Fiber optic cable specifications for E-FRL-SIC option
Recommended fiber optic cable:
62.5/125 µm multimode fiber
The following Fiber optic cable can be used:
100/140 µm multimode fiber
85/µm multimode fiber
50/125 µm multimode fiber
Coax cable RG-58 specifications for E-CX-SIC option
Coax type: Coax RG-58 thin-net cable, 50 ohms. Cable
must meet the Ethernet IEEE 802.3 specif-
ication for a thin coax segment.
Coax Segment Distance: Maximum distance of 185
meters (610 feet)
Table 1 illustrates the individual wires that make up a
straight through twisted pair modular cable. Each pair has
designated pin connections on an RJ-45 modular connector.
There are only two active pairs in a 10BaseT network.
10BaseT pinning for straight through cabling (from hub to
network device): Pins 1 and 2 are paired, and pins 3 & 6
are paired. Use only dedicated wire pairs (such as
blue/white, white/blue, or orange/white, white/orange,etc.).
Table 1A
RJ-45 Male RJ-45 Male
1- - - - - - - - - - - - - - - - - - - - - - - - - - -1
2- - - - - - - - - - - - - - - - - - - - - - - - - - - 2
3- - - - - - - - - - - - - - - - - - - - - - - - - - - 3
6- - - - - - - - - - - - - - - - - - - - - - - - - - - 6
Installing Optional Slide In Cards
Optional Slide In Cards provide added capability to your net-
work. These are available in Coax (E-CX-SIC), Fiber optic
(E-FRL-SIC) and Twisted pair (E-TBT-SIC) cabling. (See
cabling specifications on page 7&8.) With the optional Slide
In Cards you can cascade to other hubs or connect to a dif-
ferent backbone media. In addition, the hub redundancy
feature may also be utilized using either Twisted pair or
Fiber optic Slide In Cards (see page 2).
When installing Slide in Cards, note the following: 1) The
Coax Slide in Card (E-CX-SIC), may not be used for the
redundancy feature and requires a coax T (and terminator if
at the end of a segment). 2) The SQE switch must be set to
OFF. 3) Before installing Slide in Cards, disconnect AC
power to the hub.
12
4
5 6
7
83 18
FIG 2: RJ -45 PIN CONFIGURATIONS
Crossover Cable for cascading hubs or connecting trans-
ceiver to transceiver. Table 1B
RJ-45 Male RJ-45 Male
1- - - - - - - - - - - - - - - - - - - - - - 3
2- - - - - - - - - - - - - - - - - - - - - - 6
3- - - - - - - - - - - - - - - - - - - - - - 1
6- - - - - - - - - - - - - - - - - - - - - - 2