METRObility Optical Systems twister 2111 Operation manual

Installation & User Guide
Models: 2111-12-01 / 2111-13-B / 2111-15-B
“twister”® 2111
10 Mbps Media Converter
LINK
PWR
10BASE-2 10BASE-T
™
“twister” 2111
ACT
ON OFF
TERM
COL
TX RX
LK
AT PWR
10BASE-FL 10BASE-T
™
“twister” 2111
TX RX
LK LK
AT AT PWR
10BASE-FL 10BASE-T
™
“twister” 2111
II
x
LK
AT
II
x

This publication is protected by the copyright laws of the United States and other countries, with all rights
reserved. No part of this publication may be reproduced, stored in a retrieval system, translated, transcribed,
or transmitted, in any form, or by any means manual, electric, electronic, electromagnetic, mechanical,
chemical, optical or otherwise, without prior explicit written permission of Metrobility Optical Systems, Inc.
© 1999-2005 Metrobility Optical Systems, Inc. All rights reserved. Printed in USA.
Metrobility
®
10 Mbps “twister”
®
Standalone Media Converters
2111-12-01 ____RJ-45 to BNC
2111-13-B _____ RJ-45 to FL multimode SC
2111-15-B _____ RJ-45 to FL multimode ST

Table of Contents
“twister”2111 Media Converter Installation & User Guide
Introduction .............................................................................................................. 4
Overview ................................................................................................................... 4
Installation Guide ..................................................................................................... 5
STEP 1: Unpack the “twister” and Accessories ........................................ 5
STEP 2: Attach the Rubber Feet................................................................ 5
STEP 3: Choose an Appropriate Location ................................................ 5
STEP 4: Set the Switches .......................................................................... 6
Termination Switch ............................................................................. 6
Transparency Switch ........................................................................... 7
MDI-II to MDI-X Switch .................................................................... 8
STEP 5: Connect to the Network .............................................................. 9
Twisted-Pair Interface ......................................................................... 9
Fiber Optic Interface ......................................................................... 10
BNC Interface ................................................................................... 11
STEP 6: Apply Power.............................................................................. 13
User Guide .............................................................................................................. 15
System LEDs........................................................................................... 15
Transparency Mode ................................................................................. 16
Topology Solutions ................................................................................. 18
Technical Specifications.......................................................................... 19
Product Safety, EMC and Compliance Statements ................................. 20
Warranty and Servicing ........................................................................... 21
Metrobility Optical Systems, Metrobility, Lancast, and “twister” are registered trademarks of Metrobility Optical
Systems, Inc.; the Metrobility Optical Systems logo is a trademark of Metrobility Optical Systems, Inc. All
others are trademarks of their respective owners.
The information contained in this document is assumed to be correct and current. The manufacturer is not
responsible for errors or omissions and reserves the right to change specifications at any time without notice.

4
Overview
Introduction
Metrobility “twister” media converters represent the hottest technology
available for extending Ethernet networks. Since Metrobility first developed
“twister” media conversion, it has become a standard for providing cost-effective
means of integrating mixed media environments. As LANs grow and evolve, this
technology provides the ideal solution for building effective migration strategies.
Designed to meet IEEE 802.3 compliance, these media converters are compatible
with Ethernet devices from other leading network technology providers. This
increases the flexibility of your network by ensuring reliable data transmission in
multi-vendor as well as mixed media environments.
The information in this guide will help you to install and start using your “twister”
2111 media converter.
The Metrobility “twister” 2111 10 Mbps media converter provides seamless
integration of 10BASE-T Category 3, 4, and 5 twisted-pair segments with either
multimode 10BASE-FL fiber optic segments or thinnet coax in Ethernet environ-
ments.
To optimize your Ethernet network, the 2111 media converter provides seamless
operation in half- or full-duplex modes. Full signal restoration—with a low bit
delay—ensures accurate data transmission to and from LANs within an organization.
All signal activity is completely converted ensuring accurate communication and
collision detection in connected segments and allowing maximum media length to be
achieved on either side of the device.
The “twister” 2111 provides the following key features:
• MDI-II/MDI-X switch on the twisted-pair port to eliminate the need for
crossover cables.
• Transparency Mode that allows auto-negotiation by end points through the
media converter. (2111-13-B and 2111-15-B only.)
• Auto polarity on the twisted-pair port.
• Half- and full-duplex support.
• Low bit delay to ensure accurate data flow across the network.
• Transparency to data frame sizes.
• Full compliance with applicable sections of IEEE 802.3.

“twister”2111 Media Converter 5
2
Installation Guide
Follow the simple steps outlined in this section of the guide to install and start
using your Metrobility “twister” media converter.
Unpack the “twister”and Accessories
Check that the following components have been included with your order:
• “twister” 2111 media converter
• Power supply
• Power cord
• Four (4) rubber feet
Your order has been provided with the safest possible packaging, but
shipping damage does occasionally occur. Inspect your order carefully. If
you discover any shipping damage, notify the carrier and follow their
instructions for damage and claims. Save the original shipping carton if
return or storage of the unit is necessary.
Attach the Rubber Feet
The “twister” 2111 is shipped with four rubber feet. To install the feet, turn
the “twister” upside-down. Peel the self-adhesive rubber feet from the paper
strip and attach one foot to each corner on the bottom of the “twister” 2111.
Installing the feet provides an air gap which helps to cool the unit, adds
stability, and prevents marring and scratching of the desktop surface.
Choose an Appropriate Location
The “twister” 2111 media converter is intended for use in an office or
industrial environment. The unit must be located within six (6) feet of the
AC power source being used and placed as far away as possible from
electrical noise generating equipment such as copiers, electrostatic printers,
and other motorized equipment. If exposed twisted-pair wiring is used
nearby, the wiring should be routed as far away as possible from power
cords and data cables to minimize interference.
The units may be oriented in any manner that permits you to make physical
connection to the power supply and leaves a minimum of six (6) inches of
space for proper ventilation.
TUV Compliance Note: For pluggable equipment, the socket outlet must be installed
near the equipment and be easily accessible.
Bei Geräten mit Steckanschluß muß die Steckdose nahe dem Gerät angebracht und
leicht zugänglich sein.
1
3

6 Installation Guide
COL
LINK
PWR
10BASE-2 10BASE-T
™
“twister” 2111
ACT
OFF
TERM
Termination Switch
(default is OFF)
ON
Set the Switches
Termination Switch
(2111-12-01 only)
The “twister” 2111-12-01 has a termination switch located on the front panel.
This switch, labeled TERM, is used to set either internal or external
termination on the BNC port.
External termination is enabled when the switch is in the OFF position
(default). Use this setting if the “twister” will be used in a daisy-chain
configuration, or if you must use a BNC T-connector and terminator for
proper external termination.
Internal 50Ωtermination is enabled when the switch is in the ON position.
To change the setting, use a pointed object to slide the switch. When
internal termination is enabled, the unit’s BNC port can be connected
directly to another device, without the use of an external BNC terminator.
4

“twister”2111 Media Converter 7
Transparency Switch
(2111-13-B and 2111-15-B only)
The “twister” 2111-13-B and 2111-15-B have a set of DIPswitches located on
the back panel. Only the transparency switch, labeled TSP, is configurable. All
other DIP switches are nonfunctional.
When TSP is ON (default), the “twister” becomes completely transparent to
the end devices connected to its two ports. This allows the devices to
perform auto-negotiation directly with each other. For most applications,
we recommend this mode of operation.
When TSP is disabled (OFF), you must manually configure the speed and
duplex on both end devices to the same setting.
Refer to Transparency Mode for more information about this feature.
PWR
DC INPUT/5VDC
OFF
ON
DIP
switches
default
settings
ON
OFF
TSP
TSP

8 Installation Guide
TX RXSM
PWR
10BASE-FL 10BASE-T
™
“twister” 2111
LKAT LKAT
MDI-II / MDI-X Switch
(default is MDI-II)
PWR
10BASE-2 10BASE-T
™
“twister” 2111
TX RX
LK LK
AT AT PWR
10BASE-FL 10BASE-T
™
“twister” 2111
II
x
MDI-II / MDI-X Switch
(default is MDI-II)
LINKACT
ON OFF
TERM
COL
A device that is wired straight through, needs one crossover connection:
If the cable is
straight through
crossover
the MDI-II to MDI-X switch setting should be
X
II
A device that is wired crossover, needs a parallel connection:
If the cable is
straight through
crossover
the MDI-II to MDI-X switch setting should be
II
X
MDI-II to MDI-X Switch
All “twister” media converters with twisted-pair ports have an MDI-II to
MDI-X switch that eliminates the need for crossover cables. The switch
allows simple setup in either straight through or crossover configurations. It
is located on the bottom of the unit directly below the RJ-45 connector, or
on the front panel between the two ports. Refer to the illustrations below.
When setting the MDI-II to MDI-X switch, observe the positioning of the
following symbols:
• The parallel symbol (II ) indicates a straight through or parallel
connection. (default)
• The cross symbol (X) indicates a crossover connection.
These symbols are clearly marked on the unit. Using a pointed object,
simply slide the switch in the direction of the appropriate symbol, or press
the switch to the desired setting. Use the following table as a guide:

“twister”2111 Media Converter 9
Connect to the Network
The Metrobility “twister” 2111 media converter offers the ease of plug-and-
play installation. Refer to the appropriate section below for guidelines
regarding specific network connections.
Twisted-pair Interface
(all models)
The “twister” 2111 provides one shielded RJ-45 connector for Category 3,
4, or 5 twisted-pair segments and supports a maximum link length of up to
100 meters.
NOTE: Be sure you have set the MDI- II to MDI-X switch to the proper
configuration. Refer back to STEP 4 if necessary.
Once power is applied to the unit, correct connectivity can be verified via
the link (LK) LED.
5
TX RX
LK
AT PWR
10BASE-FL 10BASE-T
™
“twister”2111
TX RX
LK LK
AT AT PWR
10BASE-FL 10BASE-T
™
“twister”2111
II
x
LK
AT
II
x

10 Installation Guide
Fiber Optic Interface
The following “twister” models support 10BASE-FL segments via ST or SC
connectors.
• The 2111-13-B provides one set of FL multimode SC connectors, which
support a maximum segment length of up to 2 km for remote links.
• The 2111-15-B provides one set of FL multimode ST connectors, which
support a maximum segment length of up to 2 km for remote links.
When making fiber optic connections, be sure that the transmitter (TX) on
the “twister” connects to the receiver (RX) on the connected device and that
the transmitter (TX) on the connected device connects to the receiver (RX)
on the “twister” unit.
Once power is applied to the unit, correct connectivity can be verified via
the LK LED.
TX RX
LK
AT PWR
10BASE-FL 10BASE-T
™
“twister”2111
TX RX
LK LK
AT AT PWR
10BASE-FL 10BASE-T
™
“twister”2111
II
x
LK
AT
II
x

“twister”2111 Media Converter 11
BNC Interface
(2111-12-01)
The “twister” 2111-12-01 attaches to thinnet coaxial cable via a standard
BNC connector and supports a maximum segment length of 185 meters.
IMPORTANT: The coaxial cable of a LAN must be properly terminated at
the end of each segment regardless of the device used at the end of each
cable. One end of the two terminators on each segment must be grounded.
COL
LINK
PWR
10BASE-2 10BASE-T
™
“twister” 2111
ACT
OFF
TERM
COL
LINK
PWR
10BASE-2 10BASE-T
“
“twister”2111
ACT
OFF
TERM
ON
Termination ON
Termination OFF
(default)

12 Installation Guide
When the internal 50Ωtermination switch is enabled (ON), the “twister”
can be connected directly to a workstation or other device.
When the termination switch on the “twister” is disabled (OFF), you must
attach a BNC terminator to the T-connector which connects to the unit.
The example below illustrates how to connect the “twister” 2111-12-01
when the termination switch is disabled and when it is enabled.
Workstation
Workstation
Workstation
Workstation
Hub
twister
(Termination OFF)
SEGMENT 1 (0.5 meters min. / 185 meters max.)
SEGMENT 2 (0.5 meters min. / 185 meters max.)
Workstation
twister
(Termination ON)
UTP Cable
up to 100 meters Workstation
Hub
twister
(Termination ON)
BNC Terminator
BNC T-Connector twister
(Termination OFF)
BNC Terminator
UTP Cable
up to 100 meters

“twister”2111 Media Converter 13
Apply Power
Power is provided to the “twister” unit from the 90-250V universal desktop
power supply module. This power module is equipped with a S760 hollow-
type plug for insertion into the DC jack located on the back of the “twister”
unit and standard IEC 320-type AC power receptacle.
When making power connections, it is recommended that the DC power
cord be connected to the DC input jack located on the back of the “twister”
media converter before making the AC connection to the outlet.
PWR
DC INPUT/5VDC
OFF
ON
TSP
Upon receiving power, the “twister” media converter goes into normal
operation mode and automatically provides the appropriate signal
translation between the connected network segments.
Be sure to verify correct segment connectivity via the link (LK) LEDs on
the front of the unit.
If an additional extension cord is used to connect the power module to the
power source, the following guidelines must be followed.
While one end of the AC power cord can be fitted with whatever plug
is standard for the country of operation, the end that connects to the
“twister” power supply module must have a female plug that fits this
type of AC receptacle.
6

14 Installation Guide
• AC 115V (North American): use a UL-listed and CSA-certified cord
set consisting of a minimum No. 18 AWG, type SVT or SJT three-
conductor cord (15 feet maximum length) and a parallel blade
grounding-type attachment plug rated 15A, 125V.
• AC 230V (USA): use a UL-listed cord set consisting of a minimum
No. 18 AWG, type SVT three-conductor cord (15 feet maximum
length) and a tandem blade grounding-type attachment plug rated
15A, 250V.
• 240V (outside USA): use a cord set consisting of a minimum No. 18
AWG cord and grounding-type attachment plug rated 15A, 250V.
The cord set should have the appropriate safety approvals for the
country in which the “twister” 2111 is being installed and be marked
HAR.

“twister”2111 Media Converter 15
User Guide
This section contains more detailed information regarding certain operating
features for the “twister” media converter.
System LEDs
The Metrobility “twister” 2111 media converter provides LEDs for the visible
verification of unit status and proper functionality as well as aiding in troubleshoot-
ing and overall network diagnosis and management.
LEDs indicate the following:
• PWR (power): the unit is receiving power and functioning normally.
• LK: (link): satisfactory link status on the respective port.
• AT (activity): the respective port is receiving data.
• COL*(collision): detection of a collision condition and subsequent JAM
packets generated on both segments.
Once power is applied to the unit, you can verify correct connectivity via the LK
LED(s).
*Applies to the “twister”2111-12-01 only.

16 User Guide
Transparency Mode
(2111-13-B and 2111-15-B only)
By default, the “twister” 2111-13-B and 2111-15-B are configured with the
Transparency Mode enabled (ON). In this mode, the “twister” is completely
transparent to devices connected to its ports. To the end devices, it appears that they
have a direct connection to each other and can auto-negotiate their duplex mode.
Both end devices can also see any link loss conditions simultaneously. For most
applications, we recommend this mode of operation.
The following diagram shows a typical network configuration using two “twister”
2111-xx-B media converters for remote connectivity. Because Transparency (TSP) is
enabled, the end devices can negotiate whether to use half or full duplex.
Switch/Hub
w/SNMP Remote Device
2111-xx-B
twister
LED lit = established link LED unlit = no link
2111-xx-B
twister
TSP is ON TSP is ON
Auto-negotiation occurs end to end
TX FX TX
Management
Station
When the end devices have auto-negotiation (AN) enabled, a loss of link anywhere
in the segment is propagated to both ends, as shown in the diagram below. This
allows both end devices to become aware of any link loss condition.
Switch/Hub
w/SNMP Remote Device
2111-xx-B
twister
LED lit = established link LED unlit = no link
2111-xx-B
twister
TSP is ON TSP is ON
Link loss indication sent to both ends
AN is ON AN is ON
TX
FX
TX
Management
Station
If auto-negotiation is disabled on the end devices, a loss of link anywhere along the
segment will be propagated to both ends except when the failure occurs on a single
fiber strand, as shown in the following diagram. In this situation, the link loss will be
forwarded in only one direction.

“twister”2111 Media Converter 17
Switch/Hub
w/SNMP Remote Device
2111-xx-B
twister
LED lit = established link LED unlit = no link
2111-xx-B
twister
AN is OFF AN is OFF
Link loss is forwarded
TX
FX
TX
TSP is ON TSP is ON
Management
Station
When the Transparency Mode is disabled (OFF), you must manually configure the
speed and duplex on both end devices to the same setting. That is, both end devices
must be set to one of the following configurations:
• 10 Mbps full duplex.
• 10 Mbps half duplex.

18 User Guide
Topology Solutions
Enterprise Switch
F/O Links
Twisted-pair Links
10Mbps Hub
2km multimode F/O
twister 2111
Lancast Intelligent 7500
with R111 10Mbps modules
PC with fiber NIC
PCs with NICs

“twister”2111 Media Converter 19
Technical Specifications
Data Rate
Data Rate _________________________________________ 10 Mbps half duplex
_________________________________________ 20 Mbps full duplex*
Bit Delay ____________________________________________________ < 5 bits
Network Connections
Twisted-Pair Interface
Connector ____________________________________ Shielded RJ-45, 8-pin jack
Impedance__________________________________________ 100 Ohms nominal
Signal Level Output (differential) _____________________________ 2.0 to 2.8 V
Signal Level Input ____________________________________ 350 mV minimum
Supported Link Length___________________________________________ 100 m
Cable Type ______________________________________Category 3, 4, or 5 UTP
(EN55024:1998 compliance) ______________________ Category 5 STP
Multimode Fiber Optic Interface (2111-13-B, 2111-15-B)
Connector __________________________________________________ ST or SC
Wavelength ___________________________________________________ 820 nm
RX Input Sensitivity _____________________________ -32.5 dBm peak minimum
Output Power _________________________-21.8 dBm to -16.8 dBm (50/125 µm)
__________________________ -19 dBm to -14 dBm (62.5/125 µm)
Supported Link Length______________________________ up to 2 km full duplex
Cable Type _____________________________ 50/125, 62.5/125, 100/140 µm F/O
Thinnet Coax Interface (2111-12-01)
Connector _____________________________________________ BNC receptacle
Internal Transceiver ________________________________________ IEEE 802.3
Supported Link Length______________________________________ up to 185 m
Cable Type ________________________________________ RG-58 coaxial cable
Power
Input ____________________________________________ 90-250VAC 50/60 Hz
Output _______________________________________________ +5 VDC @ 1.2 A
Environmental
Operating Temperature _______________________________________ 0°to 55°C
Storage Temperature_______________________________________ -25°to 70°C
Relative Humidity _____________________________ 5% to 95% non-condensing
Physical Case ____________________________ Fully enclosed metal construction
Dimensions __________________________________ 4.83" L x 3.26" W x 1.71" H
_____________________________________ 12.3 cm x 8.3 cm 4.3 cm
Weight (including power supply) ______________________________ 3 lb, 1.36 kg
* Does not apply to the “twister”2111-12 (BNC).

20 User Guide
Product Safety, EMC and Compliance Statements
This equipment complies with the following requirements:
•UL
• CSA
• EN60950 (safety)
• FCC Part 15, Class A
• EN55022 Class A (emissions)
• EN55024: 1998 (immunity)
• IEC 825-1 Classification
• Class 1 Laser Product
• ICES-003 Class A (emissions)
•CB
This product shall be handled, stored and disposed of in accordance with all govern-
ing and applicable safety and environmental regulatory agency requirements.
The following FCC and Industry Canada compliance information is applicable to
North American customers only.
USA FCC Radio Frequency Interference Statement
This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses and can
radiate radio frequency energy, and if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interfer-
ence in which case the user will be required to correct the interference at his own
expense.
Caution: Changes or modifications to this equipment not expressly approved by the
party responsible for compliance could void the user’s authority to operate the
equipment.
Canadian Radio Frequency Interference Statement
This Class A digital apparatus meets all requirements of the Canadian Interference-
Causing Equipment Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du Réglement sur
le matériel brouilleur du Canada.