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© Copyright August 1994 by Cabletron Systems, Inc. P. O. Box 5005, Rochester, NH 03866-5005 All Rights Reserved Printed in the United States Part number: 9030729-02 August 1994 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. FOT-DF24 802.3 10BASE-FL/FOIRL REDUNDANT TRANSCEIVER WITH LANVIEW ® P W R S Q E X M T R V C C L N SN LNK ACT TX RX LNK ACT TX RX MIN MAX SQE Primary Port Back-up Port 1 2 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 m m, 62.5/125 m m, and 100/140 m m fiber optic cable. Link length depends cable type and system The FOTDF24 supports a maximum link length AUI Cable AUI 15 Pin D-Type Connector Caution: You must disable the SQE test function if you The AUI port connects the Transceiver to an Ethernet connect the FOT-DF-24 to a repeater or to an Ethernet OOOOOOO OOOOOOOO 8 Logic Ref device. The cable can be up to 50 meters long and Version 1 device. In addition, some Version 2 15 No Connection 7 No Connection must comply with IEEE 802.3 or with Ethernet Version equipment does not support SQE Test. Devices that 14 Logic Ref. 6 Power Return 1 or 2 specifications. do not support the SQE Test function will interpret the 13 Power (+12Vdc) SQE test pulse as a collision, resulting in poor network 5 Receive + Fiber Optic Cable Link Attenuation 12 Receive performance. 4 Logic Ref. At an 850 nm wave length, link segment attenuation 11 Logic Ref. Setting the MIN/MAX Switch can be no more than: 3 Transmit + 10 Transmit - The MIN/MAX switch sets the time duration that the 2 Collision + • 13.0 db for 50/125 m m cable 9 Collision - transceiver waits before switching to the redundant • 16.0 db for 62.5/125 m m cable 1 Logic Ref. fiber port. MIN equals approximately 2 seconds. MAX • 19.0 db for 100/140 m m 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: Better than 10-9 error rate Transmitter Peak 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 m m fiber: -13.0 dBm ; -16.5 dBm worst case budget Into 62.5/125 m m fiber: -10.0 dBm ; 19.5 dBm worst case budget Into 100/140 m m 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 OPERATING ENVIRONMENT Operating Range: Heat Output: 5° to 40°C (41° to 104° F) 17 Btu/hr Storage Range: -30° to 80° C (-22° to 160° F) Humidity Range: 5 to 95% (non-condensing) SAFETY Designed in accordance with 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 ( l ) position. To disable the SQE test function, slide to the off position (O) as indicated transceiver. Warning: Use a non-conductive probe, or disconnect the transceiver’s AUI connector before setting the SQE and MIN/MAX switches. 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 R...