Cabletron Systems FOT-F14 User Manual

Transmit (XMT) LED

  This green LED flashes when 

the transceiver puts data onto the network. The LED 

flash is pulse-stretched for viewing effect. The XMT 

LED stays off if the device is active, but not transmitting 

data onto the network.

Receive (RCV) LED

  This yellow LED flashes when 

the FOT-F receives data from the network. If the trans-

ceiver is attached to a device such as a repeater, RCV 

flashes when data passes through the FOT-F. The 

LED flash is pulse-stretched for viewing effect. 

Collision Present (CLN) LED

  This red LED flashes 

when the transceiver detects a collision condition or a 

jabber packet on the network. The flash frequency may 

increase as network activity increases since more col-

lisions are likely to occur. The LED flash is pulse-

stretched for viewing effect.

Media Link Good (LNK) LED

  When lit, this green 

LED indicates that a link exists between the transceiver 

and the device at the other end of the fiber pair seg-

ment. LNK remains lit as long as the link is main-

tained. To ensure that a link is maintained, the trans-

ceiver generates a 1 MHz idle signal when it is not 

transmitting data.

Getting Help

If you have questions, or need additional help, contact

Cabletron Systems Technical Support as follows:

By phone:

Monday through Friday,

8 am to 8 pm EST at

(603) 332-9400

By CompuServe:

GO CTRON from any ! prompt

By Internet mail:

support@ctron.com

LANVIEW 

is a registered trademark of Cabletron

Systems, Inc.

FOT-F14

,

 FOT-F24

, and

 FOT-F25 

are trademarks of 

Cabletron Systems, Inc.

CompuServe 

is a registered trademark of 

CompuServe, Inc.

Ethernet

 is a trademark of Xerox Corp.

FCC NOTICE

This device complies with Part 15 of the FCC rules.

Operation is subject to the following two conditions: (1)

this device may not cause harmful interference, and

(2) this device must accept any interference received,

including interference that may cause undesired

operation.

NOTE: 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 uses,

generates, and can radiate radio frequency energy

and if not installed in accordance with the operator’s

manual, may cause harmful interference to radio

communications. Operation of this equipment in a

residential area is likely to cause interference in which

c a s e   t h e   u s e r   w i l l   b e   r e q u i r e d   t o   c o r r e c t   t h e

interference at his own expense.

WARNING:

 Changes or modifications made to this

device which are not expressly approved by the party

responsible for compliance could void the user’s

authority to operate the equipment.

DOC NOTICE

This digital apparatus does not exceed the Class A lim-

its for radio noise emissions from digital apparatus set 

out in the Radio Interference Regulations of the Cana-

dian Department of Communications.

NOTICE

Cabletron Systems reserves the right to make changes 

in specifications and other information contained in this 

document without prior notice. The reader should in all 

cases consult Cabletron Systems to determine wheth-

er any such changes have been made. The hardware, 

firmware, or software described in this manual is sub-

ject to change without notice.

IN NO EVENT SHALL CABLETRON SYSTEMS BE

L I A B L E   F O R   A N Y   I N C I D E N TA L ,   I N D I R E C T,

S P E C I A L ,   O R   C O N S E QU E N T I A L   DA M AG E S

WHATSOEVER (INCLUDING, BUT NOT LIMITED TO,

LOST PROFITS) ARISING OUT OF OR RELATED TO

THIS MANUAL OR THE INFORMATION CONTAINED

IN IT, EVEN IF CABLETRON SYSTEMS HAS BEEN

ADVISED OF, KNOWN OR SHOULD HAVE KNOWN,

THE POSSIBILITY OF SUCH DAMAGES.

Part Number 9030652-01

© Copyright August 1994 by

Cabletron Systems, Inc.

P.O. Box 5005, Rochester, NH 03866-5005

All Rights Reserved

Printed in the United States of America

FOT-F14   FOT-F24   FOT-F25

802.3 10BASE-FL 

Transceiver User’s Guide

The

 FOT-F14™

, 

FOT-F24™

, and 

FOT-F25™

 fiber op-

tic transceivers are each designed to link two Ether-

net™ devices through fiber optic cable. The three 

transceiver types are identical except for the type of ca-

ble connectors:

FOT-F14: SMA Connector Ports and 10" AUI Cable

FOT-F24: ST Connector Ports and 10" AUI Cable

FOT-F25: ST Connector Ports and 90

°

 AUI Port

The specifications and instructions in this guide apply 

to all three fiber optic transceiver models, which are 

collectively called the FOT-F.

Requirements

The FOT-F complies with IEEE 802.3 10BASE-FL 

specifications. You can use the FOT-F transceivers 

with Version 1, Version 2, and/or IEEE 802.3 equip-

ment. For best network performance, be sure to ob-

serve the following network guidelines.

Distance and Cable Type  

The FOT-F supports 

50/125 

µ

m, 62.5/125 

µ

m, and 100/140 

µ

m fiber optic 

cable. Link length depends on cable type and the sys-

tem fiber optic budget. IEEE 802.3 10BASE-FL specifi-

cations allow a maximum link length of 1 km. However, 

if the system budgets are met, then a 2 km link length 

is possible. 

Link Attenuation  

At an 850 nm wave length, link seg-

ment attenuation can be no more than:

• 13.0 db for 50/125 fiber cable

• 16.0 db for 62.5/125 fiber cable

• 19.0 db for 100/140 fiber cable

AUI Cable  

The AUI port connects the transceiver to an 

Ethernet device. The cable you connect can be up to 

50 meters long and must comply with IEEE 802.3 or 

with Ethernet Version 1 or 2 specifications.