Cabletron Systems FOT-DF24 User Manual

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 pulsestretched 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 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-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 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 AD VISED OF, KNOWN OR SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH DAMAGES.

FOT-DF24

802.3 10BASE-FL/FOIRL Redundant T ransceiver

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.

Primary Port

FOT-DF24

802.3 10BASE-FL/FOIRL REDUNDANT TRANSCEIVER

WITH LANVIEW®

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 por t 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 µ m, 62.5/125 µ m, and 100/140 µ m ﬁber optic cable. Link length depends on cable type and system ﬁber optic budget. The FOTDF24 supports a maximum link length of 2 km.

SQE

R LNK

ACT

LNK

ACT

MIN MAX

Back-up Port

TX RX

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.

Fiber Optic Cable Link Attenuation

At an 850 nm wave length, link segment attenuation can be no more than:

• 13.0 db for 50/125 µ m cable

• 16.0 db for 62.5/125 µ m cable

• 19.0 db for 100/140 µ 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 Transmitter Peak

Wavelength: 820 nm typical;

Spectral Width: 75 nm max Rise Time: 10 nsec max Fall Time: 10 nsec max

Transmitter Power

Into 50/125 µ m ﬁber: -13.0 dBm ;

Into 62.5/125 µ m ﬁber: -10.0 dBm ;

Into 100/140 µ m ﬁber: -7.0 dBm;

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 V oltage: 12.0 Vdc typical; 9.5 Vdc

-9

error rate

790 nm min; 860 nm max

-16.5 dBm worst case budget

19.5 dBm worst case budget

22.5 dBm worst case budget

min; 15.75 Vdc max

AUI 15 Pin D-Type Connector

8 Logic Ref 7 No Connection 6 Power Return 5 Receive + 4 Logic Ref. 3 Transmit + 2 Collision + 1 Logic Ref.

OPERATING ENVIRONMENT

Operating Range: 5˚ to 40˚C (41˚ to 1 Heat Output: 17 Btu/hr

Storage Range: -30 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.

INST ALLING 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

O O O O O O O O

to 80

15 No Connection

14 Logic Ref.

13 Power (+12Vdc)

12 Receive -

11 Logic Ref.

10 Transmit -

O O

9 Collision -

C (-22

04˚

to 160

Caution

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 inter pret the SQE test pulse as a collision, resulting in poor network performance.

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

2. Attach a fiber cable from one transceiver TX port,

3. Attach the AUI cable to the Ethernet device.

4. Check the LANVIEW® LEDs. The PWR LED

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 Function 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.

You must disable the SQE test function if you

ports on the FOT-DF24 and from the ends of the connectors on each fiber cable.

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.

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.