AFCT-57D3ATMZ
Digital Diagnostic SFP 10 km, 1310 nm DFB, 8.5/4.25/2.125 GBd
Fibre Channel Optical Transceiver with TX/RX Rate Select
Data Sheet
AF
-57
CT
D3
MZ
AT
Description
Avago Technologies’ AFCT-57D3ATMZ optical transceiver
supports high-speed serial links over single-mode optical
fiber at signaling rates up to 8.5 GBd. Compliant with Small
Form Pluggable (SFP and SFP Plus) mechanical and elec-
trical specifications for LC Duplex transceivers, ANSI Fibre
Channel for FC-PI-4 and FC-PI-2 for gigabit applications.
The part is electrically interoperable with SFP conformant
devices.
The AFCT-57D3ATMZ supports both TX and RX Rate Select
feature. It uses Rate Select to vary maximum transmitted
RS(1) optical power for assisting interoperability with
legacy 2G and 4G receivers. Fibre Channel FC-PI-4 has
increased maximum received optical powers with each
new data rate. As long as minimum link distances are
chosen to avoid receiver overload, Rate Select enabled
transceivers are not required. However, if link distances
vary from 2 m to 10 km, the transmitter Rate Select RS(1)
can be utilized to guarantee interoperability with low
speed receivers.
The AFCT-57D3ATMZ has isolated signal and chassis SFP
grounds to maximize flexibility in host system applications.
As an enhancement to the conventional SFP interface
defined in SFF-8074i, the AFCT-57D3ATMZ supports
SFF-8472 (digital diagnostic interface for optical trans-
ceivers). Using the 2-wire serial interface defined in the
SFF-8472 MSA, the AFCT-57D3ATMZ provides real-time
temperature, supply voltage, laser bias current, laser
average output power and received input power. This in-
formation is in addition to conventional SFP base data. The
digital diagnostic interface also adds the ability to disable
the transmitter (TX_DISABLE), monitor for Transmitter
Faults (TX_FAULT), and monitor for Receiver Loss of Signal
(RX_LOS).
Features
•
Compliant to Restriction on Hazardous Substances
(RoHS) directive
•
Diagnostic features per SFF-8472 “Diagnostic
Monitoring Interface for Optical Transceivers”
•
Real time monitoring of:
– Transmitted optical power
– Received optical power
– Laser bias current
– Temperature
– Supply voltage
•
Rate Select functionality per SFF-8431
•
Wide temperature and supply voltage operation
(-10 °C to 85 °C) (3.3 V ± 10%)
•
SFP Plus mechanical Applications
•
Transceiver specifications per SFP (SFF-8074i) Multi-
Source Agreement and SFF-8472 (revision 11.0)
- 8.5 GBd Fibre Channel operation for FC-PI-4
800-SM-LC-L
- 4.25 GBd Fibre Channel operation for FC-PI-4
400-SM-LC-L
- 2.125 GBd Fibre Channel operation for FC-PI-4
200-SM-LC-L
•
Link lengths up to 10 km at 8.5/4.25/2.125 GBd with
single-mode fiber
•
LC Duplex optical connector interface conforming to
ANSI TIA/EIA604-10 (FOCIS 10A)
•
1310 nm Distributed Feedback Laser (DFB) source tech-
nology
•
IEC 60825-1 Class 1/CDRH Class 1 laser eye safe
•
Enhanced EMI performance for high port density ap-
plications
Related Product
•
AFBR-57D9AMZ: 850 nm + 3.3 V LC SFP
for 8.5/4.25/2.125 GBd Fibre Channel
Description,
continued
Installation
The AFCT-57D3ATMZ can be installed in any SFF-8074i
compliant Small Form Pluggable (SFP) port regardless of
host equipment operating status. The AFCT-57D3ATMZ 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. AFCT-57D3ATMZ 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 Diagnostics
The AFCT-57D3ATMZ is compliant to the Diagnostic Mon-
itoring Interface (DMI) defined in the document SFF-8472.
These features allow the host to access, via I
2
C-bus,
real-time diagnostic monitors of transmit optical power,
received optical power, temperature, supply voltage, and
laser operating current.
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. AFCT-57D3ATMZ real-time monitors of
Tx_Bias, Tx_Power, Vcc, Temperature and Rx_Power can
be used to assess local transceiver current operating con-
ditions. 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 AFCT-57D3ATMZ predictive failure feature allows a
host to identify potential link problems before system per-
formance 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 ul-
tra-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).
OPTICAL INTERFACE
LIGHT FROM FIBER
RECEIVER
PHOTO-DETECTOR
AMPLIFICATION
& QUANTIZATION
ELECTRICAL INTERFACE
RD+ (RECEIVE DATA)
RD- (RECEIVE DATA)
Rx LOSS OF SIGNAL
CONTROLLER & MEMORY
RATE_SELECT RS(0)
RATE_SELECT RS(1)
MOD-DEF2 (SDA)
MOD-DEF1 (SCL)
MOD-DEF0
TRANSMITTER
LIGHT TO FIBER
DFB Laser
LASER
DRIVER &
SAFETY
CIRCUITRY
TX_DISABLE
TD+ (TRANSMIT DATA)
TD- (TRANSMIT DATA)
TX_FAULT
Figure 1. Transceiver functional diagram.
2
Component Monitoring
Component evaluation is a more casual use of the
AFCT-57D3ATMZ 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.
Eye Safety Circuit
The AFCT-57D3ATMZ 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.
Transmitter Section
The transmitter section includes the Transmitter Optical
SubAssembly (TOSA) and laser driver circuitry. The TOSA,
containing an 1310nm DFB (Distributed Feedback Laser)
light source, is located at the optical interface and mates
with the LC optical connector. The TOSA is driven by a laser
driver 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).
Fibre Channel Transmit Rate Select RS(1)
The AFCT-57D3ATMZ transceiver contains a parametric
optimization circuit to ensure performance for 2.125 Gb/s,
4.25Gb/s and 8.5Gb/s data rates. When RS(1) is high, the
transceiver transmit optical power is optimized for 8.5Gb/s
performance as defined in FC-PI-4. When RS(1) is low (or
open), the transceiver transmit optical power is optimized
for 2.125Gb/s and 4.25Gb/s performance. RS(1) can also
be asserted through the two-wire serial interface (address
A2h, byte 118, bit 3) and monitored (address A2h, byte
110, bit 5).
The contents of A2h, byte 118, bit 3 are logic OR’d with
hardware RS(1) (pin 9) to control transmitter operation.
Transmit Disable (Tx_Disable)
The AFCT-57D3ATMZ accepts a LVTTL and CMOS com-
patible transmit disable control signal input (pin 3) which
shuts down the transmitter optical output. A high signal
implements this function while a low signal allows normal
transceiver 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.
Fibre Channel Receive Rate Select RS(0)
The AFCT-57D3ATMZ receiver is designed to ensure per-
formance for 2.125 Gb/s, 4.25Gb/s and 8.5 Gb/s data rates.
When RS(0) is High, the receiver chain is optimized for 8.5
Gb/s performance as defined in FC-PI-4. When RS(0) is Low
(or open), the receiver chain is optimized for 2.125 Gb/s
and 4.25 Gb/s performance.
RS(0) can also be asserted through the two-wire serial
interface (address A2h, byte 110, bit 3) and monitored
(address A2h, byte 110, bit 4). The contents of A2h, byte
110, bit 3 are logic OR’d with hardware RS(1) (pin 7) to
control transmitter operation.
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).
3
Receiver Section
The receiver section includes the Receiver Optical SubAs-
sembly (ROSA) and the amplification/quantization circuitry.
The ROSA, containing a PIN photodiode and custom tran-
simpedance 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-amplification and
quantization.
Caution
There are no user serviceable parts nor maintenance
requirements for the AFCT-57D3ATMZ. All mechanical
adjustments are made at the factory prior to shipment.
Tampering with, modifying, misusing or improperly
handling the AFCT-57D3ATMZ 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 AFCT-57D3ATMZ 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 (Sub-
chapter 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 AFCT-57D3ATMZ interfaces with the host circuit
board through twenty I/O pins (SFP electrical connector)
identified by function in Table 2. The board layout for this
interface is depicted in Figure 6.
The AFCT-57D3ATMZ high speed transmit and receive
interfaces 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 (per SFF-8074i) 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 (per
SFF-8074i) if used. If an application 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 AFCT-57D3ATMZ to supporting physical layer ICs.
Timing for MSA compliant control signals implemented in
the transceiver are listed in Figure 4.
Regulatory Compliance
The AFCT-57D3ATMZ 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 AFCT-57D3ATMZ 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 AFCT-57D3ATMZ. 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 AFCT-57D3ATMZ’s compliance to these standards is
detailed in Table 1. The metal housing and shielded design
of the AFCT-57D3ATMZ minimizes the EMI challenge
facing the equipment designer.
EMI Immunity (Susceptibility)
Due to its shielded design, the EMI immunity of the
AFCT-57D3ATMZ exceeds typical industry standards.
Flammability
The AFCT-57D3ATMZ optical transceiver is made of metal
and high strength, heat resistant, chemical resistant and
UL 94 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
JEDEC A114
Variation of IEC 61000-4-2
Performance
Class 1 (> 2000 V)
>1000 V for high speed signal pins TD
±,
RD
±
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 1
IEC 61000-4-3
US FDA CDRH AEL Class 1
US21 CFR, Subchapter J per
Paragraphs 1002.10 and 1002.12
(IEC) EN 60950-1: 2006+A11+A1+A12+A2
(IEC) EN 60825-1: 2007
(IEC) EN 60825-2: 2004+A1+A2
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 80MHz to 1 GHz
CDRH Accession No. 9521220-210
TUV file: E173874
TYPE
APPROVED
Component Recognition
Underwriters Laboratories and Canadian
Standards Association Joint Component
Recognition for Information Technology
Equipment including Electrical Business
Equipment
UL file: 4786550407
RoHS Compliance
Less than 1000 ppm of cadmium, lead, mercury,
hexavalent chromium, polybrominated biphenyls,
and polybrominated biphenyl ethers.
5
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