AFCT-721XPDZ Avago Technologies US Inc., AFCT-721XPDZ Datasheet - Page 9

• Manufacturer Part Number: AFCT-721XPDZ
• Description: NORA XFP 10km 10GFC/10GbE 0-70
• Manufacturer: Avago Technologies US Inc.
• Series: -r

Specifications of AFCT-721XPDZ

• Data Rate: 10.625Gbps
• Wavelength: 1310nm
• Applications: General Purpose
• Voltage - Supply: 3.135 V ~ 3.465 V
• Connector Type: LC Duplex
• Mounting Type: Panel Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Digital Diagnostic Interface and Serial Identification
The 2-wire serial interface is explicitly defined in the
XFP MSA Rev 4.0. 2-wire timing specifications and the
structure of the memory map are per XFP MSA Rev 2.0.
The normal 256 Byte I2C address space is divided into
lower and upper blocks of 128 Bytes. The lower block
of 128 Bytes is always directly available and is used for
diagnostic information providing the opportunity for
Predictive Failure Identification, Compliance Predic-
tion, Fault Isolation and Component Monitoring. The
upper address space tables are used for less frequently
accessed functions such as serial ID, user writeable EE-
PROM, reserved EEPROM and diagnostics and control
spaces for future standards definition, as well as Avago
Technologies-specific functions.
Predictive Failure Identification
The diagnostic information allows the host system to
identify potential link problems. Once identified, a “fail
over” technique can be used to isolate and replace sus-
pect devices before system uptime is impacted.
Compliance Prediction
The real-time diagnostic parameters can be monitored
to alert the system when operating limits are exceeded
and compliance cannot be ensured. As an example, the
real time average receive optical power can be used to
assess the compliance of the cable plant and remote
transmitter.
Fault Isolation
The diagnostic information can allow the host to pin-
point the location of a link problem and accelerate sys-
tem servicing and minimize downtime.
Component Monitoring
As part of host system qualification and verification,
real time transceiver diagnostic information can be
combined with system level monitoring to ensure per-
formance and operating environment are meeting ap-
plication requirements.
Transceiver Module Temperature
The transceiver module temperature represents the
module case temperature. It is a calibrated value from
an internal PCB temperature measured using a sensing
circuitry.

Transmitter Laser DC Bias Current
Laser bias current is measured using sensing circuitry
located on the transmitter laser driver IC. Normal varia-
tions in laser bias current are expected to accommodate
the impact of changing transceiver temperature and
supply voltage operating points. The AFCT-721XPDZ
uses a closed loop laser bias feedback circuit to main-
tain constant optical power over time at a given tem-
perature. This circuit compensates for normal laser
parametric variations in quantum efficiency, forward
voltage and lasing threshold due to changing trans-
ceiver operating points.
Transmitted Average Optical Output Power
Variations in average optical power are not expected
under normal operation because the AFCT-721XPDZ
uses a closed loop laser bias feedback circuit to main-
tain constant optical power. This circuit compensates
for normal laser parametric variations due to changing
transceiver operating points. Only under extreme laser
bias conditions will significant drifting in transmitted
average optical power be observable. Therefore it is rec-
ommended Tx average optical power be used for fault
isolation, rather than predictive failure purposes.
Received Average Optical Input Power
Received average optical power measurements are a
valuable asset for installers to verify cable plant compli-
ance. Drifts in average power can be observed from the
cable plant and remote transmitter for potential predic-
tive failure use. Received average optical power can be
used for fault isolation.
Auxiliary Monitors
There are two auxiliary monitors implemented in the
AFCT-721XPDZ. One is the +3.3V supply voltage report-
ed as Auxiliary Measurement 2. The other is the Module
PCB Temperature reported as Auxiliary Measurement
1. As there is no auxiliary type defined for Module PCB
Temperature, the auxiliary type for Laser Temperature
(0100b) is used in this case.