Cabletron Systems Two Way Radio FOT DF24 User Manual

FCC NOTICE  
Transmit (XMT) This green LED flashes when the  
FOT-DF24 transmits data. The LED flash is pulse  
stretched for viewing effect. The XMT LED is off when  
the device is active but not transmitting.  
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.  
Receive (RCV) This yellow LED flashes when the  
FOT-DF24 receives data from the network. If attached  
to a repeater, RCV flashes when data passes through  
the FOT-DF24. The LED is pulse-stretched for viewing  
effect.  
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 case the user will  
be required to correct the interference at his own expense.  
Collision (CLN) 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 traffic increases since more  
collisions are likely to occur. The LED is pulse-  
stretched for viewing effect.  
FOT-DF24  
802.3 10BASE-FL/FOIRL  
Redundant Transceiver  
The FOT-DF24™ fiber optic transceiver is designed to  
link two Ethernet™ devices through fiber optic cable.  
Dual fiber optic ports with ST type connectors provide  
redundant data paths for critical applications.  
Link OK (LNK) When lit, this green LED indicates that  
a link exists between the FOT-DF24 and the device at  
the other end of the fiber optic segment. LNK remains  
lit as long as the link is maintained. To maintain the  
link, the transceiver generates a 1 MHz idle signal  
when it is not transmitting data. Both ports can show a  
valid link.  
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  
Primary Port  
SQE  
This digital apparatus does not exceed the Class A limits for  
radio noise emissions from digital apparatus set out in the  
Radio Interference Regulations of the Canadian Department  
of Communications.  
FOT-DF24  
P
W
R
S
Q
E
X
M
R
V
C
C
L
N
802.3 10BASE-FL/FOIRL  
REDUNDANT TRANSCEIVER  
WITH LANVIEW®  
T
LNK  
TX  
1
2
Active Port (ACT) This yellow LED indicates which  
fiber optic port is handling all network traffic through  
the transceiver. Only one port can be active; the  
inactive port ACT LED is off. A flashing ACT LED  
indicates that the port is in the idle state. A slow flash  
indicates that the time-out period is set to 10 seconds;  
a fast flash indicates that the time-out period is set to  
2 seconds.  
ACT  
RX  
SN  
NOTICE  
LNK  
ACT  
TX  
RX  
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 whether any such  
changes have been made. The hardware, firmware, or  
software described in this manual is subject to change  
without notice.  
MIN MAX  
Back-up Port  
If the primary port (port 1) receives no data for either 2  
or 10 seconds (switch selectable), the port enters the  
idle state. During the idle state, if the back-up port  
(port 2) receives data it becomes the active port.  
When the primary port senses data again, it switches  
back to become the active port. The two transceiver  
ports can be connected to the same network device,  
different network devices or even different networks.  
GETTING HELP  
IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE  
FOR ANY INCIDENTAL, INDIRECT, SPECIAL, OR  
CONSEQUENTIAL DAMAGES 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.  
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  
REQUIREMENTS  
By CompuServe:  
By Internet mail:  
GO CTRON from any ! prompt  
The FOT-DF24 Transceiver complies with IEEE 802.3  
10BASE-FL/FOIRL specifications. Use the FOT-DF24  
with Version 1, Version 2, and/or IEEE 802.3  
equipment. For best network performance, observe  
the following network guidelines.  
© Copyright August 1994 by  
Cabletron Systems, Inc.  
P.O. Box 5005, Rochester, NH 03866-5005  
All Rights Reserved  
LANVIEW is a registered trademark of Cabletron  
Systems, Inc.  
FOT-DF24 is a trademark of Cabletron Systems, Inc.  
Fiber Optic Requirements  
Printed in the United States of America  
Part number: 9030729-02 August 1994  
The FOT-DF24 supports 50/125 µm, 62.5/125 µm, and  
100/140 µm fiber optic cable. Link length depends on  
cable type and system fiber optic budget. The FOT-  
DF24 supports a maximum link length of 2 km.  
CompuServe is a registered trademark of  
CompuServe, Inc.  
Ethernet is a trademark of Xerox Corp.  
 

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