Net Optics Fiber Mode Converters User Manual

Installation Guide for

Fiber Mode Converters

Doc PUBFMCSAU Rev.1, 06/06

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Product Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Product Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Connecting to the Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Conguration Guidelines for Link Fault Signaling (LFS) Operation . . . . . . . . . 9

Safety Notes on Laser Singlemode type Connectors . . . . . . . . . . . . . . . . . . . . 10

Fiber Mode Converter

Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Limitations on Warranty and Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Fiber Mode Converter

PLEASE READ THESE LEGAL NOTICES CAREFULLY.

By using a Net Optics Fiber Mode Converter you agree to the terms and conditions of usage set forth
by Net Optics, Inc.

No licenses, express or implied, are granted with respect to any of the technology described in this
manual. Net Optics retains all intellectual property rights associated with the technology described in
this manual. This manual is intended to assist application in installing Net Optics products into your

network.

Trademarks and Copyrights

© 2010 by Net Optics, Inc. Net Optics® is a registered trademark of Net Optics, Inc. Additional com­pany and product names may be trademarks or registered trademarks of the individual companies and
are respectfully acknowledged.

Additional Information

Net Optics, Inc. reserves the right to make changes in specications and other information contained
in this document without prior notice. Every effort has been made to ensure that the information in this
document is accurate. Net Optics is not responsible for typographical errors.

Introduction

Net Optics Singlemode to Multimode Converters are simple and reliable
devices for connecting multimode ber trafc to single mode ber devices
and links. Use these bi-directional media converters individually to connect
100Base-FX multimode and singlemode devices, or in pairs at each end of
long-distance singlemode ber links. These Converters are the perfect solution
for dispersed networks where media conversion required between multimode
segments separated by long distances.

Fast and Versatile

The Singlemode to Multimode Converters support seamless media conversion
at 100 Mbps over link distances up to 2 kilometers with 62.5/125 multimode
ber and up to 15 kilometers with 8.5/125 singlemode ber. The Singlemode
to Multimode Converter supports either full or half-duplex transmission.

Fault Tolerant and Reliable

Net Optics Singlemode to Multimode Converters incorporate Link Fault
Signaling, which gives the devices connected to the Converter critical
information about link status. If either side of the bi-directional link fails, the
Converter immediately communicates the fault to both devices, reducing the
time required to activate a redundant path. To control jitter over long optical
links, the Converter features Clock and Data Recovery (CDR). CDR ensures
that the overall jitter budget is not exceeded when deploying converter pairs
with long ber links.

Fiber Mode Converter

1

Key Features

Passive, Secure Technology

• Net Optics’ Fast Ethernet FMC series converters are 100Base-FX to
100Base-FX converters. The units comply with all applicable IEEE 802.3u
specications.

• The FMC series converters are designed to be simple plug-and-play prod­ucts. Just plug the multimode or single mode ber optic connectors into the
appropriate port and the conversion is done.

• Provides transparent conversion at 100 Mbps without data stream interfer­ence or introducing a point of failure

• Link Fault Signaling provides critical link status information

• Clock and Data Recovery (CDR) control overall jitter when deploying
converter pairs

• Compatible with all 100Base-FX singlemode and multimode bers

• Fully RoHS compliant

Ease of Use

• LED indicators show link status and redundant power

• Front-mounted connectors support easy installation and operation

• Optional 19-inch rack frames hold up to 3 or 12 Taps

• Tested and compatible with all major manufacturers’ monitoring devices,
including protocol analyzers, probes, and intrusion detection/prevention

systems

Support

• Net Optics offers free technical support throughout the lifetime of your
purchase. Our technical support team is available from 8 am to 5 pm Pacic
Time, Monday through Friday at [phone] and via email at ts­[e-mail]. FAQs are also available on Net Optics website at
www.netoptics.com.

Fiber Mode Converter

2

Product Features

The FMC-SA and FMC-R have one pair (Port 1) of standard, multimode,
1300 nm ber optic SC type connectors and a pair (Port 2) of ber optic, 1310
nm singlemode SC connectors. The singlemode, ber optic connectors are
eye-safe Laser driven and have a transmission range of 15Km in full duplex.
The standard multimode connectors support a transmission range of 2Km in
full duplex.

Product Diagrams

Fiber Mode Converter

Figure 1. Front Panel of FMC-R Converter

3

Connecting to the Network

1. Unpack the Fiber Mode Converter, verify that you have all components,

and obtain the required cables needed to successfully install the unit. Your
package should contain: one Converter, one power supply, one power cord
and one users Manual (this manual).

2. Multimode Ports: Using a duplex SC multimode cable, connect the appro-

priate switch, server, or router to the Fiber Mode Converter's Multimode

Port.

3. Singlemode Ports: Using a duplex SC singlemode cable, connect the appro-

priate switch, server, or router to the Fiber Mode Converter's Singlemode

Port.

4. Supply power to the Fiber Mode Converter using the power supply included

with the unit.

5. Compare the LEDs on the Fiber Mode Converter to the chart below to

verify correct setup.

• PWR: Power.

Power LED (in side of unit) illuminates green when device is powered on.

• MM: Multimode Fiber Link.
This LED illuminates green when a good ber optic link is established.

• SM: Singlemode Fiber Link.
This LED illuminates green when a good ber optic link is established.

• LF: Link Fault.
This LED illuminates yellow when a link fault is present.

Fiber Mode Converter

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Connecting to the Network

The FMC series converters with F/O connections operate over duplex ber
optic cable. This means that two separate ber optic cables are used for
data transmission. One cable is for transmitting data and the other is for
receiving data. The transmit port is designated with TX and the receive port is
designated with RX. When attaching the FMC converter to another ber optic
device, the TX port on the FMC converter must be attached to the RX port on
the other device and vice-versa. When the connection is correct, the F/O link
LED will remain lit.

Fiber optic cable connectors must match the card type i.e. (SC), and the cable
type (multimode) or (single mode). The ber optic cable must not be bundled
with too tight of a bend radius. This may attenuate the light intensity resulting
in link failure. A tight bend radius can also result in accelerated stress fracture
of the glass cable bers making premature cable failure likely.

Note: For 100 Mb/s, half-duplex operation, linking two DTEs via a ber optic
segment; the maximum transmission range is approximately 412 meters. If
an FMC converter is used to link two DTEs in half-duplex, a bit budget (bit
time delay) calculation should be made to conrm the validity of the network
topology.

Fiber Mode Converter

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Fiber Mode Converter

Maximum Round Trip Delay

There are certain rules of Fast Ethernet installation a user must understand
in order to be able to calculate valid cable lengths in a given set up situation.
Maximum round trip delay in bit times is 512; late collisions and/or CRC
errors are indicators that the path delays exceed 512 bit times.

For a network to be valid the worst-case path delay value (PDV) must be
512 bit times or less. Examine the network topology and choose the pair of
DTEs with the largest collision domain diameter, that is the two DTEs that are
farthest apart, and apply the following formula/rules to determine whether the
network is valid.

Network Component Delays

Component Maximum round trip delay in bit times

DTE TX to TX 100

DTE TX to FX 100

DTE FX to FX 100

FMC Converter 10

Class I repeater 140

Class II repeater (all TX/FX ports) 92

Cable Round trip delay in bit times per meter

Cat5 1.112

STP 1.112

F/O 1.0

MII (.5m) 0 (delay included in DTE times)

Network Cable Maximums

Cable Segment Maximum cable length in meters

DTE TX to TX; Cat 5 or STP 100 (half or full-duplex)

DTE FX to FX; Fiber Optic 412 (half-duplex)

6

2007 (full-duplex)

Fiber Mode Converter

Examples

Maximum of 512 total bit times between the two farthest DTEs
DTE TX to DTE FX has 100 bit times delay
CFT converter has a 50 bit time delay
Class I repeater has 140 bit times delay
TX cable has 1.112 bit times delay per meter
F/O cable has 1.0 bit times delay per meter

If cable B to C is 5 meters of Cat 5, and cable C to D is 87 meters of Cat 5,
then how long can the F/O cable, A to B be?

Total maximum bit time +512
Less DTE TX to DTE FX -100
Less Class I repeater -140
Less CFT converter -10
Less (5m x 1.112) -5.56
Less (87m x 1.112) -96.74
Remaining bit time +159.7

Remaining bit time divided by the cable delay time per meter of F/O cable
yields 159 meters of total ber optic cable available to use.
(159.7/1.0 = 159.7 m)

7

Fiber Mode Converter

Examples (continued)

If cable A to B is 10 meters of STP and cable B to C is 150 meters of F/O,
then what is the maximum length of the Cat 5 cable C to D?

Total maximum bit time +512
Less DTE TX to TX -100
Less (2 x CFT converters) -20
Less (10m x 1.112) -11.12
Less (150m x 1.0) -150
Remaining bit time +230.88

Remaining bit time divided by 1.112 (the bit time delay per meter of Cat 5
cable) yields a maximum C to D cable of 207 meters.

8

Fiber Mode Converter

Conguration Guidelines for Link Fault Signaling (LFS)

Operation

Link Fault Signaling (LFS) circuitry provides visual indication of link
condition on both segments as well as alerting each host DTE when the
remote link (segment) is down.

1. The FMC series converter operates when it receives a link signal from a

device attached to either port 100Base-FX), then turns-on the link signal to the
device on the other (port) segment. Both (F/O) segments must be connected to
the FMC converter before proper link across both segments can be established
AND at least one end device must provide a link signal to initiate link across
all segments.

2. The FMC converter does not auto-negotiate data rate.

If two FMC converters or a combination CCM card and FMC converter are
used in series to connect two twisted pair nodes then:

A. If at least one of the (100Base-FX) ports can initiate the link signal,
then the converter will establish link and properly support the LFS function
across all segments including both FMC converters or CCM/FMC converter
combination in sequence.

B. If both end nodes are using 100/half duplex/full duplex speed selection
ports, pairs of FMC converters or CCM/FMC combinations (with LFS)
connected in series, will work only if both are set to the same speed. If
CSMA/CD is being run; consult the bit time calculation guide for valid
network congurations.

Note: The FMC series does not have a full duplex/ half duplex switch. They
receive and transmit data 10/100Mbps/half/full duplex transparently, up to
OC-3 speeds.

9

Fiber Mode Converter

Safety Notes on Laser Singlemode type Connectors

The FMC-SA uses 1300 nm wavelength, eye-safe type laser, ber optic single

mode connectors.

When connecting pairs of devices using laser type connectors or connecting
pairs of devices using LED type connectors, simply plug in the ber optic
connectors in the normal manner. However, if mixed LED and eye-safe laser
driven devices are connected, the laser emitter has the potential (may in some
installations) to saturate the Rx (Receive) port on the LED driven device. In
effect, the LED port might be “dazzled” by the intensity of the laser source.

Net Optics’ recommends that an attenuator providing a (4-7db reduction) be
inserted in the F/O cable segment between the two units to reduce the light
intensity propagating from the eye-safe laser driven device. The attenuator
only needs to be inserted on the ber optic cable strand linking the Tx
(Transmit) port on the laser driven device, and the Rx (Receive) port on the
Net Optics’ LED driven device.

Note: _______________________________________________________________

Non-eye safe 1300-1500nm laser driven devices will permanently damage
Net Optics’ LED driven single mode equipment. Such damage will not be
covered by warranty.

______________________________________________________________________

CAUTION: NEVER ATTEMPT TO VERIFY ANY FIBER OPTIC
CONNECTION BY LOOKING DIRECTLY INTO A FIBER-OPTIC PORT
OR CABLE. IF THE LIGHT SOURCE IS A NON-EYE SAFE, LASER
EMITTER, PERMANENT EYE DAMAGE MAY RESULT.

NEVER LOOK INTO THE BORE OF A FIBER OPTIC CONNECTOR!

10

Specications

Environmental

Operating Temperature: 0˚C to 40˚C
Storage Temperature: -10˚C to 70˚C
Relative Humidity: 5% min, 95% max, non-condensing

Power

Power Supply Input: 100-240 VAC, 0.6A, 50-60 Hz

(AC100-125V~30VA, 50-60 Hz, for Japan)

Output: 5V, 2A (5V, 2.4A for UK and Japan)

Mechanical

Dimensions: 1.0” high x 5.3” deep x 2.9” wide

Connectors

(2) Duplex SC connectors

Fiber Optic Interfaces (100Base-FX)

Fiber Mode Converter

Port #2 for: FMC-SA

Connector: Two SC type (Singlemode) eye-safe Laser
emitter type

Cable: 8.7-10.0um/125um singlemode ber

Link length: 412 m half duplex max, 15km full duplex
(nominal)

Optical transmitter: Wavelength: 1300nm (Laser)

Output power (single mode): 15 dBm min, -8 dBm max (10/125 ber)

Optical receiver input
sensitivity (singlemode): 31 dBm max

11

Fiber Mode Converter

Port #1

Connector: Two SC type (multimode)

Link length: 412m half duplex max, 2km full duplex max

Optical transmitter: Wavelength: 1300 nm

Output power (multi mode): 19 dBm min, 14 dBm max (62.5/125 ber)

Optical receiver input
sensitivity (multi mode): 33.5 dBm typ, 31dBm max

Certications

• The Net Optics’ converters are designed to comply with all the following
safety, emissions and susceptibility specications: UL 1950, CSA-C22.2
No. 950-93, CEMark EN60950 and EN55022, and FCC Class B.

• Fully RoHS compliant

12

Fiber Mode Converter

Limitations on Warranty and Liability

Net Optics offers a limited warranty for all its products. IN NO EVENT SHALL NET OPTICS, INC.
BE LIABLE FOR ANY DAMAGES INCURRED BY THE USE OF THE PRODUCTS (INCLUD­ING BOTH HARDWARE AND SOFTWARE) DESCRIBED IN THIS MANUAL, OR BY ANY
DEFECT OR INACCURACY IN THIS MANUAL ITSELF. THIS INCLUDES BUT IS NOT LIM­ITED TO LOST PROFITS, LOST SAVINGS, AND ANY INCIDENTAL OR CONSEQUENTIAL
DAMAGES ARISING FROM THE USE OR INABILITY TO USE THIS PRODUCT, even if Net
Optics has been advised of the possibility of such damages. Some states do not allow the exclusion
or limitation of implied warranties or liability for incidental or consequential damages, so the above
limitation or exclusion may not apply to you.

Net Optics, Inc. warrants this Fiber Mode Converter to be in good working order for a period of ONE
YEAR from the date of purchase from Net Optics or an authorized Net Optics reseller.

Should the unit fail anytime during the said ONE YEAR period, Net Optics will, at its discretion,
repair or replace the product. This warranty is limited to defects in workmanship and materials and
does not cover damage from accident, disaster, misuse, abuse or unauthorized modications.

If you have a problem and require service, please call the number listed at the end of this section and
speak with our technical service personnel. They may provide you with an RMA number, which must
accompany any returned product. Return the product in its original shipping container (or equivalent)
insured and with proof of purchase.

THE WARRANTY AND REMEDIES SET FORTH ABOVE ARE EXCLUSIVE AND IN LIEU OF
ALL OTHERS, EXPRESS OR IMPLIED. No Net Optics reseller, agent, or employee is authorized
to make any modication, extension, or addition to this warranty.

Net Optics is always open to any comments or suggestions you may have about its products and/or
this manual.

Send correspondence to
Net Optics, Inc.
5303 Betsy Ross Drive
Santa Clara, CA 95054 USA
Telephone: [phone]
Fax: [phone]
Email: [e-mail]
Internet: www.netoptics.com

All Rights Reserved. Printed in the U.S.A. No part of this publication may be reproduced, transmit­ted, transcribed, stored in a retrieval system, or translated into any language or computer language,
in any form, by any means, without prior written consent of Net Optics, Inc., with the following
exceptions: Any person is authorized to store documentation on a single computer for personal use
only and that the documentation contains Net Optics’ copyright notice.

13

Notes:

Fiber Mode Converter

14

www.netoptics.com

© 2010 by Net Optics, Inc. All Rights Reserved.