Cabletron Systems FOT-DF24 User's Manual
Contents
1. Setting the MIN MAX Switch The MIN MAX switch sets the time duration that the transceiver waits before switching to the redundant fiber port MIN equals approximately 2 seconds MAX equals approximately 10 seconds Connecting the FOT DF24 to the Network 1 Remove the plastic covers from the fiber optic ports on the FOT DF24 and from the ends of the connectors on each fiber cable 2 Attach a fiber cable from one transceiver TX port to the RX port on the network device Likewise attach a fiber cable from the RX port on the transceiver to the TX port on the network device Repeat this procedure for the second transceiver port and network device 3 Attach the AUI cable to the Ethernet device 4 Check the LANVIEW LEDs The PWR LED should be lit to indicate that the transceiver is receiving power through the AUI cable The LNK LEDs should be lit to indicate a link between the transceiver and the network devices One ACT LED should be lit to indicate that the port is the active port it has received a valid data packet The SQE LED will be lit if the SQE test function is enabled USING LANVIEW LANVIEW is Cabletron Systems diagnostic and status monitoring system Power PWR When lit this green LED indicates that the FOT DF24 is receiving power through the AUI connector If the PWR LED is not lit power is not being received or the DC to DC converter in the transceiver has failed Signal Quality Error SQE Test Functio2. Fiber Optic Cable Link Attenuation At an 850 nm wave length link segment attenuation can be no more than e 13 0 db for 50 125 um cable e 16 0 db for 62 5 125 um cable 19 0 db for 100 140 um cable OPERATING SPECIFICATIONS Cabletron Systems reserves the right to change these specifications any time without notice General Receive Sensitivity 29 5 dBm Max Receive Power 8 2 dBm Bit Error Rate Transmitter Peak Better than 10 error rate Wavelength 820 nm typical 790 nm min 860 nm max Spectral Width 75 nm max Rise Time 10 nsec max Fall Time 10 nsec max Transmitter Power Into 50 125 um fiber 13 0 dBm 16 5 dBm worst case budget Into 62 5 125 um fiber 10 0 dBm 19 5 dBm worst case budget Into 100 140 um fiber 7 0 dBm 22 5 dBm worst case budget Note The transmitter power and receive sensitivity levels are peak power levels To convert to average power levels subtract 3 dbm Power Supply Input Current 500mA Input Voltage 12 0 Vdc typical 9 5 Vdc min 15 75 Vdc max AUI 15 Pin D Type Connector 15 No Connection 14 Logic Ref 13 Power 12Vdc 6 Power Return 5 Receive 4 Logic Ref 3 Transmit 2 Collision 1 Logic Ref 9 Collision OOO00000 OPERATING ENVIRONMENT Operating Range 5 to 40 C 41 to 104 F Heat Output 17 Btu hr Storage Range 30 to 80 C 22 to 160 F Humidity Range 5 to 95 non condensing SAFETY Designed in accordance wi
3. 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 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 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 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 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 GETTING HELP If you have questions or need addit
4. fiber optic ports with ST type connectors provide redundant data paths for critical applications Primary Port FOT DF24 m 99909 802 3 10BASE FL FOIRL wa My k REDUNDANT TRANSCEIVER ai 6 e x with LANVIEW LNK aL 1 ACT o RX z T aT o FY CaBleTRON Peay systems o D gt Te Complete Kemoking Sonton Back up Por 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 REQUIREMENTS 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 Fiber Optic Requirements The FOT DF24 supports 50 125 um 62 5 125 um and 100 140 um 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 AUI Cable The AUI port connects the Transceiver to an Ethernet device The cable can be up to 50 meters long and must comply with IEEE 802 3 or with Ethernet Version 1 or 2 specifications
5. ional help contact Cabletron Systems Technical Support as follows By phone Monday through Friday 8 am to 8pm EST at 603 332 9400 GO CTRON from any prompt support ctron com By CompuServe By Internet mail LANVIEW is a registered trademark of Cabletron Systems Inc FOT DF24 is a trademark 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 case the user will be required to correct the interference at his own expense WARNING Changes or modifications made to this device which are not expressly approved b
6. n When lit this yellow LED indicates that the transceiver s SQE test function is on The SQE test ensures that the collision presence circuit and the path between the Ethernet device and the transceiver are operational
7. th UL 1950 CSA C22 2 No 950 and EN 60950 the EMI requirements of FCC Class A and EN 55022 Class A and the EMC requirements of EN 50082 1 Note It is the responsibility of the person who sells the system to which the FOT DF24 will be a part to ensure that the total system meets allowed limits of conducted and radiated emissions INSTALLING THE FOT FB24 To install your FOT DF24 set the SQE and MIN MAX switches connect the AUI cable to an Ethernet device connect the fiber optic ports to the network and use the cable ties and mounts to provide cable strain relief Observe the requirements listed previously in this guide and the guidelines listed in the following sections Setting the SQE Switch The SQE Signal Quality Error switch is a two position switch on the top of the transceiver The FOT DF24 is shipped with the SQE switch in the on position To disable the SQE test function slide the SQE switch to the off position O as indicated on the front of the transceiver Warning Use a non conductive probe or disconnect the transceiver s AUI connector before setting the SQE and MIN MAX switches Caution You must disable the SQE test function if you connect the FOT DF 24 to a repeater or to an Ethernet Version 1 device In addition some Version 2 equipment does not support SQE Test Devices that do not support the SQE Test function will interpret the SQE test pulse as a collision resulting in poor network performance
8. y 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 limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian 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 whether any such changes have been made The hardware firmware or software described in this manual is subject to change without notice 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 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 Part number 9030729 02 August 1994 CABLETRONM systems The Complete Networking Solution 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
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