FTLX6811MCC and FTLX6814MCC T-XFP Product Specification – July 2011

F i n i s a r

© Finisar Corporation 2011

1117598 Rev A03

Page 9

• Register 76d, table 01h is a volatile memory. Therefore if the transceiver is

power-cycled, the register starts up with a value of 00h which corresponds to the

default Rx Threshold value.

• The threshold adjustment input value is 2’s complement 7 bit value (-128 to

+127), with 0 corresponding to default Rx threshold value. Full range of

adjustment provides at least a ±10% change in Rx threshold from the default

value.

•

An increase in RxDTV value sets the threshold closer to the “1” value of the eye.

The Default setting is the factory tuned optimized set point and is not necessarily

the 50% RxDTV value.

SBS suppression, dither tone

Set Address 111, bit 1 to “0” to enable tone, “1” to disable dither tone (defaults:

frequency = 40kHz , tone is disabled). Please contact your Finisar RSM or PLM if

specific amplitudes and frequencies are needed for SBS suppression.

Tuning Management Interface for ITU Frequency Grid Applications

Implementation of wavelength or frequency tuning is indicated in Serial ID Byte 221

(Table 01h) bit 1.

Data Address

Bit

Description

221 (Table 01h)

1

Wavelength or frequency tunability implemented

The Finisar tunable XFP supports both wavelength and frequency tuning (as specified in

INF-8077i), the wavelength tuning support is indicated by the transceiver description

encoded in Serial ID Byte 138 bits 2 and 3.

Address

Bit

Description of transceiver

138

3

Tunable DWDM (selection by channel number, bytes 112-113)

138

2

Tunable DWDM (selection in 50 pm steps, bytes 72-73)

138

1-0

Reserved