HFBR-4663 Ver la hoja de datos (PDF) - HP => Agilent Technologies

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HFBR-4663

Single Chip 10BASE-FL Transceiver

HP => Agilent Technologies 

1. SQE Test: The FOIRL

standard did not include the

option of attaching a fiber

transceiver to a DTE. Adding the

SQE test to 10BASE-FL enables a

10BASE-FL transceiver to attach

to a DTE.

2. 0 to at Least 2 Km Distance:

The FOIRL standard specifies a 1

km distance while 10BASE-FL

specifies 2 km. The additional 1

km distance for 10BASE-FL

comes from an increased flux

budget for the cable of 3.5 dB.

This 3.5 dB increase came from

an increase of 2.5 dB sensitivity

for the receiver and a 1 dB

improvement for the transmitter.

The following table illustrates the

transmit and receive power

requirements for the two

standards. Note: FOIRL specifies

optical power in peak and

10BASE-FL specifies it in

average. Subtracting 3 dB from

peak will give the average. In the

table below the FOIRL

specifications were converted

from peak to average power.

3. MAU State Diagrams are

Different: The state diagrams for

10BASE-FL are similar to

10BASE-T, while the state

diagrams for FOIRL are slightly

different. The differences are in

the AUI loopback, and in the link

integrity function.

AUI Loopback - In 10BASE-FL

the DO to DI loopback is always

disabled during a collision, and

optical receive data is passed

through to DI. For FOIRL there

are some cases where loopback

continues (i.e. DO looped to DI)

during a collision, and others

where loopback is disabled

during a collision. 10BASE-FL is

identical to 10BASE-T in this

case. Please refer to the IEEE

standards for greater detail.

Link Integrity - 10BASE-FL adds

an additional state to the Link

Integrity Test function that will

not allow an exit from the Low

Light State until both the

transmitter and receiver are idle.

In FOIRL, it is possible to exit

from the Low Light State while

still receiving data.

MAU Timing Differences - The

timing differences between

10BASE-FL and FOIRL relate to

propagation delays, start-up

delays, and collision deassert

delays. The following table

provides the details of these

parameters.

Timing

Parameter Differences

ORD input to input on DI

Steady State Prop Delay

Start-Up Delay

Output on DO to OTD_output

Steady State Prop Delay

Start-Up Delay

Collision Deassert to

SQE Deassert minimum

FOIRL

10BASEFL

(BIT Times) (BIT Times)

0.5

2

3.5

5

0.5

2

3.5

5

4.5

0

Transmit/Receive

Average Power

FOIRL

Transmitter

Receiver

10BASE-FL

Transmitter

Receiver

Min.

Max.

Conditions

-12 dBm

-12 dBm

-21 dBm

-30 dBm

BER < 10-10

-12 dBm

-12 dBm

-20 dBm

-32.5 dBm

BER < 10-9

OTD - Optical Transmit Data

ORD - Optical Receive Data

DI, DO, CI - AU Interface Signals

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