FTLX1672M3BNL Product Specification

 Finisar Corporation - September 2015

Rev. C1

Page 7

IX. Digital Diagnostic Specifications

FTLX1672M3BNL transceivers can be used in host systems that require either

internally or externally calibrated digital diagnostics.

Parameter

Symbol

Units

Min

Max

Accuracy

Ref.

Accuracy



Transceiver temperature

DD

ºC

-10

+90

±5ºC

1

Transceiver supply voltage

DD

Voltage

V

2.8

4.0

±3%

Transmitter bias current

DD

Bias

mA

0

127

±10%

2

Transmitter output power

DD

Tx-Power

dBm

-2

+3

±2dB

Receiver average optical input power

DD

Rx-Power

dBm

-20

+1

±2dB

Notes:

1.

Internally measured

2.

The accuracy of the Tx bias current is 10% of the actual current from the laser driver to the laser

X.

Internal CDR’s Locking Modes

The FTLX1672M3BNL is equipped with internal CDR units on both the receiver and

the transmitter sides. The host can set the CDR’s to lock at 8.5Gb/s, 10G (9.95-11.3Gb/s),

or in by-pass mode, by setting the rate select pins or the soft bits (logic OR). The

different locking modes are shown in the following logic table:

R/S 0

R/S 1

CDRs

Locking Mode

Logic OR of:

pin 7 & bit 110.3

Logic OR of:

pin 9 & bit 118.3

Low or 0

Low or 0

Both CDRs lock at 8.5Gb/s

Low or 0

High or 1

Tx CDR is in bypass mode.

Rx CDR locks at 10G (9.95-11.3Gb/s)

High or 1

Low or 0

Tx & Rx CDRs in bypass mode

High or 1

High or 1

Both CDRs lock at 10G (9.95-11.3Gb/s)

The bits 110.3 and 118.3 are set to 1 by default at power-up

The RS0 and RS1 pins are internally pulled-down to ground as per [1]. The soft bits

110.3 and 118.3 are both set to “1” at the transceiver power-up, to select the 10G locking

mode by default. The host can change this configuration via the 2-wire communication as

described in the SFP MSA [1]. Alternative configurations can be factory set upon

request. Please refer to Finisar for additional details.

XI. SFF-8431 Power-up Sequence

If either CDR is enabled, the typical power consumption of the FTLX1672M3BNL

may exceed the limit of 1.5W specified for the Power Level II transceivers in [1], for

which a power-up sequence is recommended. However, the FTLX1672M3BNL is factory

set to power-up directly to its operating conditions. Upon request, it can be factory set to

follow the power-up sequence specified for transceivers exceeding 1W, as per [1]. In

power level I, the FTLX1672M3BNL does not carry traffic, but the 2-wire serial

communication is active.

Please refer to [1] and Finisar Application Note AN-2076 for additional details.