AFBR-54D7APZ
Digital Diagnostic Mini SFP (mSFP), 850 nm,
8.5/4.25/2.125 GBd Low Voltage (3.3 V)
Fibre Channel RoHS Compliant Optical Transceiver
Data Sheet
Description
Avago Technologies’ AFBR-54D7APZ optical transceiver
supports high-speed serial links over multimode optical
fiber at signaling rates up to 8.5 GBd. Compliant with Small
Form Pluggable (SFP) Multi Source Agreement (MSA) elec-
trical specifications for duplex transceivers, ANSI Fibre
Channel for FC-PI-4 and FC-PI-2 for gigabit applications.
The part is electrically and mechanically interoperable
with Mini SFP compliant applications.
The AFBR-54D7APZ is a multi-rate 850nm SFP which
ensures compliance to 8.5/4.25/2.125 GBd Fibre Channel
specifications without the need for Rate Select. The AFBR-
54D7APZ will ignore both Rate Select pin and control bit
inputs (ie. no connect inside the SFP). This simplifies Fibre
Channel host auto-negotiation algorithms, layout and
software.
As an enhancement to the conventional SFP interface
defined in SFF-8074i, the AFBR-54D7APZ is compliant to
SFF-8472 (digital diagnostic interface for optical trans-
ceivers). Using the 2-wire serial interface defined in the
SFF-8472 MSA, the AFBR-54D7APZ provides real time
temperature, supply voltage, laser bias current, laser
average output power and received input power. This
information is in addition to conventional SFP base data.
The digital diagnostic interface also adds the ability to
disable the transmitter (TX_DISABLE), monitor for Trans-
mitter Faults (TX_FAULT), and monitor for Receiver Loss of
Signal (RX_LOS).
The mini SFP form factor narrows the optical centerline
of a conventional SFP from 6.25mm to 5.25mm in order
to increase port densities in target applications. A mini
SFP is compatible with dual simplex LC connectors and
non-standard duplex LC connectors locked to a 5.25mm
centerline. Mini SFP module widths are 11.5mm vs. the
standard SFP+ width of 13.55mm, requiring a new recep-
tacle cage but remaining interoperable with the standard
SFP+ 20 pin electrical connector.
Features
x
Compliant to Restriction on Hazardous Substances
(RoHS) directive
x
Rate Select not required
x
Diagnostic features per SFF-8472 “Diagnostic Monitor-
ing Interface for Optical Transceivers”
x
Real time monitoring of:
– Transmitted optical power
– Received optical power
– Laser bias current
– Temperature
– Supply voltage
x
Mini SFP Mechanical Applications
x
Wide temperature and supply voltage operation (-10°C
to 85°C) (3.3 V ± 10%)
x
Transceiver specifications per SFP (SFF-8074i) Multi-
Source Agreement and SFF-8472 (revision 10.0)
– 8.5 GBd Fibre Channel operation for FC-PI-4
800-M5-SN-S, 800-M6-SN-S and 800-M5E-SN-I
– 4.25 GBd Fibre Channel operation for FC-PI
400-M5-SN-I , 400-M6-SN-I and 400 M5E-SN-I
– 2.125 GBd Fibre Channel operation for FC-PI
200-M5-SN-I , 200-M6-SN-I and 200 M5E-SN-I
x
Link lengths at 8.5 GBd: 21m with 62.5um OM1, 50m
with 50um OM2, 150m with 50um OM3
x
Link lengths at 4.25 GBd: 70m with 62.5um OM1, 150m
with 50um OM2, 380m with 50um OM3
x
Link lengths at 2.125 GBd: 150m with 62.5um OM1,
300m with 50um OM2, 500m with 50um OM3
x
Dual simplex LC optical connector interface conforming
to simplex aspects of ANSI TIA/EIA604-10 (FOCIS 10A)
x
850 nm Vertical Cavity Surface Emitting Laser (VCSEL)
source technology
x
IEC 60825-1 Class 1/CDRH Class 1 laser eye safe
x
Enhanced EMI performance for high port density
applications
1
Installation
The AFBR-54D7APZ can be installed in any Mini SFP
compliant pluggable port regardless of host equipment
operating status. The AFBR-54D7APZ is hot-pluggable,
allowing the module to be installed while the host system
is operating and on-line. Upon insertion, the transceiver
housing makes initial contact with the host board SFP
cage, mitigating potential damage due to Electro-Static
Discharge (ESD).
Compliance Prediction
Compliance prediction is the ability to determine if an
optical transceiver is operating within its operating and
environmental requirements. AFBR-54D7APZ devices
provide real-time access to transceiver internal supply
voltage and temperature, allowing a host to identify
potential component compliance issues. Received optical
power is also available to assess compliance of a cable
plant and remote transmitter. When operating out of
requirements, the link cannot guarantee error free trans-
mission.
Digital Diagnostic Interface and Serial Identification
The 2-wire serial interface is based on ATMEL AT24C01A
series EEPROM protocol and signaling detail. Convention-
al EEPROM memory, bytes 0-255 at memory address 0xA0,
is organized in compliance with SFF-8074i. New digital
diagnostic information, bytes 0-255 at memory address
0xA2, is compliant to SFF-8472. The new diagnostic in-
formation provides the opportunity for Predictive Failure
Identification, Compliance Prediction, Fault Isolation and
Component Monitoring.
Fault Isolation
The fault isolation feature allows a host to quickly pinpoint
the location of a link failure, minimizing downtime. For
optical links, the ability to identify a fault at a local device,
remote device or cable plant is crucial to speeding service
of an installation. AFBR-54D7APZ real-time monitors of
Tx_Bias, Tx_Power, Vcc, Temperature and Rx_Power can be
used to assess local transceiver current operating condi-
tions. In addition, status flags Tx_Disable and Rx Loss of
Signal (LOS) are mirrored in memory and available via the
two-wire serial interface.
Predictive Failure Identification
The AFBR-54D7APZ predictive failure feature allows a host
to identify potential link problems before system perfor-
mance is impacted. Prior identification of link problems
enables a host to service an application via “fail over” to
a redundant link or replace a suspect device, maintaining
system uptime in the process. For applications where ultra-
high system uptime is required, a digital SFP provides a
means to monitor two real-time laser metrics associated
with observing laser degradation and predicting failure:
average laser bias current (Tx_Bias) and average laser
optical power (Tx_Power).
Component Monitoring
Component evaluation is a more casual use of the
AFBR-54D7APZ real-time monitors of Tx_Bias, Tx_Power,
Vcc, Temperature and Rx_Power. Potential uses are as
debugging aids for system installation and design, and
transceiver parametric evaluation for factory or field qual-
ification. For example, temperature per module can be
observed in high density applications to facilitate thermal
evaluation of blades, PCI cards and systems.
2
OPTICAL INTERFACE
RECEIVER
AMPLIFICATION
& QUANTIZATION
ELECTRICAL
INTERFACE
RD+ (RECEIVE DATA)
RD- (RECEIVE DATA)
Rx
LOSS OF
SIGNAL
LIGHT FROM FIBER
PHOTO-DETECTOR
CONTROLLER
&
MEMORY
MOD-DEF2 (SDA)
MOD-DEF1 (SCL)
MOD-DEF0
TRANSMITTER
LASER
DRIVER
&
SAFETY
CIRCUITRY
TX_DISABLE
TD+
(TRANSMIT DATA)
TD-
(TRANSMIT DATA)
TX_FAULT
LIGHT TO FIBER
VCSEL
Figure 1. Transceiver functional diagram.
Transmitter Section
The transmitter section includes the Transmitter Optical
SubAssembly (TOSA) and laser driver circuitry. The TOSA,
containing an 850 nm VCSEL (Vertical Cavity Surface
Emitting Laser) light source, is located at the optical
interface and mates with the LC optical connector. The
TOSA is driven by a custom IC which uses the incoming
differential high speed logic signal to modulate the laser
diode driver current. This Tx laser driver circuit regulates
the optical power at a constant level provided the
incoming data pattern is dc balanced (8B/10B code, for
example).
Transmit Fault (Tx_Fault)
A catastrophic laser fault will activate the transmitter
signal, TX_FAULT, and disable the laser. This signal is an
open collector output (pull-up required on the host board).
A low signal indicates normal laser operation and a high
signal indicates a fault. The TX_FAULT will be latched high
when a laser fault occurs and is cleared by toggling the
TX_DISABLE input or power cycling the transceiver. The
transmitter fault condition can also be monitored via the
two-wire serial interface (address A2, byte 110, bit 2).
Eye Safety Circuit
The AFBR-54D7APZ provides Class 1 (single fault tolerant)
eye safety by design and has been tested for compliance
with the requirements listed in Table 1. The eye safety
circuit continuously monitors the optical output power
level and will disable the transmitter upon detecting an
unsafe condition beyond the scope of Class 1 certification.
Such unsafe conditions can be due to inputs from the host
board (Vcc fluctuation, unbalanced code) or a fault within
the transceiver.
Transmit Disable (Tx_Disable)
The AFBR-54D7APZ accepts a TTL and CMOS compatible
transmit disable control signal input (pin 3) which shuts
down the transmitter optical output. A high signal imple-
ments this function while a low signal allows normal trans-
ceiver operation. In the event of a fault (e.g. eye safety circuit
activated), cycling this control signal resets the module as
depicted in Figure 4. An internal pull up resistor disables
the transceiver transmitter until the host pulls the input
low. Host systems should allow a 10 ms interval between
successive assertions of this control signal. Tx_Disable can
also be asserted via the two-wire serial interface (address
A2h, byte 110, bit 6) and monitored (address A2h, byte
110, bit 7).
The contents of A2h, byte 110, bit 6 are logic OR’d with
hardware Tx_Disable (pin 3) to control transmitter
operation.
3
Receiver Section
The receiver section includes the Receiver Optical Sub-
Assembly (ROSA) and the amplification/quantization
circuitry. The ROSA, containing a PIN photodiode and
custom transimpedance amplifier, is located at the optical
interface and mates with the LC optical connector. The
ROSA output is fed to a custom IC that provides post-am-
plification and quantization.
Caution
There are no user serviceable parts nor maintenance re-
quirements for the AFBR-54D7APZ. All mechanical adjust-
ments are made at the factory prior to shipment. Tampering
with, modifying, misusing or improperly handling the
AFBR-54D7APZ will void the product warranty. It may also
result in improper operation and possibly overstress the
laser source. Performance degradation or device failure
may result. Connection of the AFBR-54D7APZ to a light
source not compliant with ANSI FC-PI specifications,
operating above maximum operating conditions or in a
manner inconsistent with it’s design and function may
result in exposure to hazardous light radiation and may
constitute an act of modifying or manufacturing a laser
product. Persons performing such an act are required by
law to re-certify and re-identify the laser product under
the provisions of U.S. 21 CFR (Subchapter J) and TUV.
Receiver
Loss
of Signal (Rx_LOS)
The post-amplification IC also includes transition detection
circuitry which monitors the ac level of incoming optical
signals and provides a TTL/CMOS compatible status signal
to the host (pin 8). An adequate optical input results in a
low Rx_LOS output while a high Rx_LOS output indicates
an unusable optical input. The Rx_LOS thresholds are
factory set so that a high output indicates a definite optical
fault has occurred. Rx_LOS can also be monitored via the
two-wire serial interface (address A2h, byte 110, bit 1).
Ordering
Information
Please contact your local field sales engineer or one of
Avago Technologies franchised distributors for ordering
information. For technical information, please visit Avago
Technologies’ WEB page at
www.avagotech.com
or contact
Avago Technologies Semicon-ductor Products Customer
Response Center at 1-800-235-0312. For information
related to SFF Committee documentation visit
www.sffcom-
mittee.org.
Functional Data I/O
The AFBR-54D7APZ interfaces with the host circuit board
through twenty I/O pins (SFP electrical connector) iden-
tified by function in Table 2. The board layout for this
interface is depicted in Figure 6.
The AFBR-54D7APZ high speed transmit and receive inter-
faces require SFP MSA compliant signal lines on the host
board. To simplify board requirements, biasing resistors
and ac coupling capacitors are incorporated into the SFP
transceiver module and hence are not required on the
host board. The Tx_Disable, Tx_Fault, and Rx_LOS lines
require TTL lines on the host board if used. If an applica-
tion chooses not to take advantage of the functionality
of these pins, care must be taken to ground Tx_Disable
(for normal operation).
Figure 2 depicts the recommended interface circuit to
link the AFBR-54D7APZ to supporting physical layer ICs.
Timing for MSA compliant control signals implemented in
the transceiver are listed in Figure 4.
Regulatory Compliance
The AFBR-54D7APZ complies with all applicable laws
and regulations as detailed in Table 1. Certification level
is dependent on the overall configuration of the host
equipment. The transceiver performance is offered as a
figure of merit to assist the designer.
Electrostatic Discharge (ESD)
The AFBR-54D7APZ is compatible with ESD levels found
in typical manufacturing and operating environments as
described in Table 1. In the normal handling and operation
of optical transceivers, ESD is of concern in two circum-
stances.
The first case is during handling of the transceiver prior to
insertion into an SFP compliant cage. To protect the device,
it’s important to use normal ESD handling pre-cautions.
These include use of grounded wrist straps, work-benches
and floor wherever a transceiver is handled.
The second case to consider is static discharges to the
exterior of the host equipment chassis after installation.
If the optical interface is exposed to the exterior of host
equipment cabinet, the transceiver may be subject to
system level ESD requirements.
Application Support
An Evaluation Kit and Reference Designs are available to
assist in evaluation of the AFBR-54D7APZ. Please contact
your local Field Sales representative for availability and
ordering details.
4
Electromagnetic Interference (EMI)
Equipment incorporating gigabit transceivers is typically
subject to regulation by the FCC in the United States,
CENELEC EN55022 (CISPR 22) in Europe and VCCI in Japan.
The AFBR-54D7APZ’s compliance to these standards is
detailed in Table 1. The metal housing and shielded design
of the AFBR-54D7APZ minimizes the EMI challenge facing
the equipment designer.
EMI Immunity (Susceptibility)
Due to its shielded design, the EMI immunity of the AFBR-
54D7APZ exceeds typical industry standards.
Flammability
The AFBR-54D7APZ optical transceiver is made of metal
and high strength, heat resistant, chemical resistant and
UL 94V-0 flame retardant plastic.
Table 1. Regulatory Compliance
Feature
Electrostatic Discharge (ESD)
to the Electrical Pins
Electrostatic Discharge (ESD)
to the Duplex LC Receptacle
Test Method
MIL-STD-883C
Method 3015.4
Variation of IEC 61000-4-2
Performance
Class 1 (> 2000 Volts)
Typically, no damage occurs with 25 kV when
the duplex LC connector receptacle is
contacted by a Human Body Model probe.
10 contacts of 8 kV on the electrical faceplate
with device inserted into a panel.
Air discharge of 15 kV (min.) contact to
connector without damage.
System margins are dependent on customer
board and chassis design.
GR1089
Electrostatic Discharge (ESD)
to the Optical Connector
Electromagnetic Interference
(EMI)
Variation of IEC 801-2
FCC Class B
CENELEC EN55022 Class B
(CISPR 22A)
VCCI Class A
Variation of IEC 61000-4-3
US FDA CDRH AEL Class 1
US21 CFR, Subchapter J per
Paragraphs 1002.10
and 1002.12
(IEC) EN60825-1: 1994 + A11 + A2
(IEC) EN60825-2: 1994 + A1
(IEC) EN60950: 1992 + A1 + A2 +
A3 + A4 + A11
Underwriters Laboratories and
Canadian Standards Association
Joint Component Recognition
for Information Technology
Equipment including Electrical
Business Equipment
Immunity
Laser Eye Safety and
Equipment Type Testing
BAUART
¬
GEPRUFT
¬
TUV
Rheinland
Product Safety
Typically shows no measurable effect from a
10 V/m field swept from 10 MHz to 1 GHz.
CDRH certification TBD
TUV file TBD
TYPE
APPROVED
Component Recognition
UL file TBD
RoHS Compliance
Less than 1000 ppm of cadmium, lead, mercury,
hexavalent chromium, polybrominated biphenyls,
and polybrominated biphenyl ethers.
5
