Operating Specifications, Safety | Cabletron Systems FOT-DF24

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 ∝m cable

•16.0 db for 62.5/125 ∝m cable

•19.0 db for 100/140 ∝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 10-9error 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 ﬁber:	-13.0 dBm ;
	-16.5 dBm worst case budget

Into 62.5/125 ∝m ﬁber: -10.0 dBm ;

19.5 dBm worst case budget

Into 100/140 ∝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

AUI 15 Pin D-Type Connector
8	Logic Ref		O	O	15	No Connection

7	No Connection
			O		14	Logic Ref.
6	Power Return		O	O
5	Receive +		O	O	13	Power (+12Vdc)
4	Logic Ref.			O	12	Receive -
			O	O	11	Logic Ref.
3	Transmit +
			O	O	10	Transmit -
2	Collision +		O

1	Logic Ref.		O	O	9	Collision -

OPERATING ENVIRONMENT
Operating Range:		5˚ to 40˚C (41˚ to 1 04˚ 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 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 (●) 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.

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 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.