AFCT-711XPDZ Avago Technologies US Inc., AFCT-711XPDZ Datasheet - Page 10

• Manufacturer Part Number: AFCT-711XPDZ
• Description: NORA XFP 2km OC-192 0-70
• Manufacturer: Avago Technologies US Inc.

Specifications of AFCT-711XPDZ

• 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

Digital Diagnostic Interface and Serial Identification
The 2-wire serial interface is explicitly defined in the XFP
MSA document and is designed to be compatible with
I2C host controllers. 2-wire timing specifications and the
structure of the memory map are per XFP MSA Rev 4.0.
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 Prediction,
Fault Isolation and Component Monitoring. The upper
address space tables are used for less frequently accessed
functions such as serial ID, user writeable EEPROM,
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
suspect 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 pinpoint
the location of a link problem and accelerate system
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 performance and
operating environment are meeting application require-
ments.
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.
10
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-711XPDZ
uses a closed loop laser bias feedback circuit to maintain
constant optical power and extinction ratio. This circuit
compensates for normal laser parametric variations in
quantum efficiency, forward voltage and lasing threshold
due to changing transceiver operating points.
Transmitted Average Optical Output Power
Variations in average optical power are not expected
under normal operation because the AFCT-711XPDZ
uses a closed loop laser bias feedback circuit to maintain
constant optical power over time at a given temperature.
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 observ-
able. Therefore it is recommended 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 AFCT-
711XPDZ. One is the +3.3V supply voltage reported 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 Tem-
perature, auxiliary type for Laser Temperature (0100b) is
used in this case.