AFCT-5750Z and AFCT-5755Z
Families of Small Form Factor Pluggable (SFP) Optical Transceivers
for Single-Mode OC12/STM-4 with Optional DMI
Part of the Avago Technologies METRAK Family
Data Sheet
Description
The AFCT-575xZ family of SFP optical transceivers for
OC12/STM-4 offers the customer a range of design op-
tions, including optional DMI (further described later),
extended or industrial temperature ranges, and standard
push-button or or bail delatch. The AFCT-5755Z fam-
ily targets applications requiring DMI features, and the
AFCT-5750Z family is streamlined for those applications
where DMI features are not needed. Throughout this
document, AFCT-575xZ will refer collectively to the en-
tire product family encompassing this range of product
features.
Features
•
ROHS compliant
•
Optional Digital Diagnostic Monitoring available
•
Part Number Options
The AFCT-575xZ
ucts:
With DMI
Part Number
AFCT-5755LZ
AFCT-5755PZ
AFCT-5755ALZ
AFCT-5755APZ
AFCT-5755TLZ
AFCT-5755TPZ
AFCT-5755ATLZ
AFCT-5755ATPZ
Without DMI
Part Number
AFCT-5750LZ
AFCT-5750PZ
AFCT-5750ALZ
AFCT-5750APZ
AFCT-5750TLZ
AFCT-5750TPZ
AFCT-5750ATLZ
AFCT-5750ATPZ
family consists of the following prod-
•
•
•
•
•
Temperature
Extended*
Extended*
Industrial*
Industrial*
Extended*
Extended*
Industrial*
Industrial*
Temperature
Extended*
Extended*
Industrial*
Industrial*
Extended*
Extended*
Industrial*
Industrial*
Design
Standard
Bail
Standard
Bail
Standard
Bail
Standard
Bail
Design
Standard
Bail
Standard
Bail
Standard
Bail
Standard
Bail
Distance
SR (2km)
SR
SR
SR
IR (15km)
IR
IR
IR
Distance
SR (2km)
SR
SR
SR
IR (15km)
IR
IR
IR
•
•
•
Applications
•
ATM switches and routers
•
SONET/SDH switch infrastructure
•
Broadband aggregation applications
•
Metro edge switching
•
Metro and access multi-service platforms
•
Suitable for Fast Ethernet applications
Related Products
•
AFCT-576xZ family of OC3 SFP transceivers with op-
tional DMI
•
AFCT-5745L/P family of OC48 SFP transceivers with
DMI
- AFCT-5750Z family: without DMI
- AFCT-5755Z family: with DMI
Per SFF-8472, diagnostic features on AFCT-5755Z
family enable Diagnostic Monitoring Interface for
optical transceivers with real-time monitoring of:
- Transmitted optical power
- Received optical power
- Laser bias current
- Temperature
- Supply voltage
Compliant with SFF-8074i SFP transceiver specifica-
tion
Compliant with ITU-T G957 STM-4 I-4 (2 km) and
STM-4 S-4.1 (15 km)
Compliant with Telcordia GR253 SR (2 km),
IR-1 (15 km)
Class 1 CDRH/IEC 825 eye safety compliant
Operating case temperature range
–10 °C to +85 °C (Extended)
–40 °C to +85 °C (Industrial)
Multitrate operation from 155Mbps to 622Mbps
LC duplex fiber connector
Manufactured in an ISO 9001 compliant facility
* Extended Temperature Range is -10 to 85 degrees C
Industrial Temperature Range is -40 to 85 degrees C
General Features
The AFCT-575xZ family of SFP optical transceivers are
high performance, cost effective modules for serial op-
tical data communications applications ranging from
155-622 Mbps. They are designed to provide SONET/
SDH compliant connections for 622 Mbps at short and
intermediate reach links. This includes specifications for
the signal coding, optical fiber and connector types, opti-
cal and electrical transmitter characteristics, optical and
electrical receiver characteristics, jitter characteristics, and
compliance testing methodology for the aforementioned.
These transceivers are qualified in accordance with GR-
468-CORE.
The transmitter section of the SR and IR transceivers incor-
porate a 1300nm Fabry Perot (FP) laser. For each device the
receiver section uses an MOVPE grown planar PIN photo-
detector for low dark current and excellent responsivity. A
positive-ECL logic interface simplifies interface to external
circuitry. The receiver section contains an InGaAs/InP
photo detector and a preamplifier mounted in an optical
subassembly. This optical subassembly is coupled to a
postamplifier/decision circuit on a circuit board.
The AFCT-575xZ family of optical transceivers adds digital
diagnostic monitoring to standard SFP functionality, en-
abling fault isolation, components monitoring and failure
prediction capabilities.
SFP MSA Compliance
The product package is compliant with the SFP MSA with
the LC connector option. The SFP MSA includes specifica-
tions for mechanical packaging and performance as well as
dc, ac and control signal timing and performance.
The power supply is 3.3 V dc.
The High Speed I/O (HSIO) signal interface is a Low Voltage
Differential type. It is ac coupled and terminated internally
to the module. The internal termination is a 100 Ohm dif-
ferential load.
Installation
The AFCT-575xZ can be installed in any SFF-8074i compli-
ant Small Form Pluggable (SFP) port regardless of host
equipment operating status. The module is hot-plug-
gable, allowing it to be installed while the host system
is operating and online. Upon insertion, the transceiver
housing makes initial contact with the host board SFP
cage, mitigating potential damage due to electrostatic
discharge (ESD).
Optical Interface
Light from Fiber
Receiver
Photo-Detector
Amplification
&
Quantization
Electrical Interface
RD+ (Receive Data)
RD- (Receive Data)
Rx Loss Of Signal
text
Controller & Memory
MOD-DEF2 (SDA)
MOD-DEF1 (SCL)
MOD-DEF0
Transmitter
Light to Fiber
TX_DISABLE
Laser Driver &
Safety Circuit
TD+ (Transmit Data)
TD- (Transmit Data)
TX_FAULT
Laser
Figure 1. Transceiver Functional Diagram
2
Transmitter Section
The transmitter section includes a 1310 nm Fabry-Perot
laser and a transmitter driver circuit. The driver circuit
maintains a constant optical power level provided that
the data pattern is valid for NRZ code. Connection to the
transmitter is provided via a LC optical connector.
The transmitter has full IEC 825 and CDRH Class 1 eye
safety.
TX_FAULT
A laser fault or a low V
CC
condition will activate the trans-
mitter fault 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 op-
eration 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 TX_FAULT is not latched for
Low V
CC
. The transmitter fault condition can also be
monitored via the two-wire serial interface (address A2,
byte 110, bit 2). By default, TX_FAULT is set to trigger on
hardware faults only.
TX_DISABLE
The transmitter output can be disabled by asserting pin
3, TX_DISABLE. A high signal asserts this function while
a low signal allows normal laser operation. The transmit-
ter output can also be disabled and monitored via the
2-wire serial interface. In the event of a transceiver fault,
such as the activation of the eye safety circuit, toggling
of the TX_DISABLE will reset the transmitter, as depicted
in Figure 2.
3.3 V
10 µF
3.3 V
0.1 µF
1 µH
1 µH
VCC,T
0.1 µF
4.7 K to 10 KΩ
Tx_DISABLE
Tx_FAULT
VREFR
TX[0:9]
TBC
EWRAP
PROTOCOL
IC
SFP MODULE
4.7 K to 10 KΩ
Tx_FAULT
VREFR
SO+
SO–
50
Ω
50
Ω
TD+
TD–
TX GND
VCC,R
0.01 µF
100
Ω
0.01 µF
VCC,R
50
Ω
LASER DRIVER
& SAFETY
CIRCUITRY
TBC
EWRAP
4.7 K to 10 KΩ
10 µF
RX[0:9]
RBC
Rx_RATE
REFCLK
SI+
100
Ω
0.1
µF
RD+
RD–
Rx_LOS
RX GND
MOD_DEF2
MOD_DEF1
MOD_DEF0
0.01 µF
0.01 µF
50
Ω
50
Ω
RBC
Rx_RATE
Rx_LOS
SI–
AMPLIFICATION
&
QUANTIZATION
GPIO(X)
GPIO(X)
GP14
REFCLK
4.7 K to
10 KΩ
4.7 K to
10 KΩ
50
Ω
VCC,R
EEPROM
4.7 K to
10 KΩ
3.3 V
Figure 2. Typical Application Configuration
3
Receiver Section
The receiver section for the AFCT-575xZ contains an
InGaAs/InP photo detector and a preamplifier mounted
in an optical subassembly. This optical subassembly is
coupled to a post amplifier/decision circuit on a circuit
board. The design of the optical subassembly provides
better than 12 dB Optical Return Loss (ORL).
Connection to the receiver is provided via a LC optical
connector.
Using the 2-wire serial interface, the AFCT-5755Z provides
real time access to transceiver internal supply voltage and
temperature, transmitter output power, laser bias current
and receiver average input power, allowing a host to pre-
dict system compliance issues. These five parameters are
internally calibrated, per the MSA. New digital diagnostic
information is accessed per SFF-8472 using EEPROM
bytes 0-255 at memory address 0xA2 (A2h).
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).
Contents of the MSA-compliant serial ID memory are
shown in Tables 3 to 7. The SFF-8074i and SFF-8472
specifications are available from the SFF Committee at
http://www.sffcommittee.org.
RX_LOS
The receiver section contains a loss of signal (RX_LOS)
circuit to indicate when the optical input signal power
is insufficient for SONET/SDH compliance. A high signal
indicates loss of modulated signal, indicating link failure
such as a broken fiber or a failed transmitter. RX_LOS can
be also be monitored via the two-wire serial (address A2,
byte 110, bit 1).
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.
Functional Data I/O
Avago’s AFCT-575xZ transceiver is designed to accept
industry standard differential signals. The transceiver pro-
vides an AC-coupled, internally terminated data interface.
Bias resistors and coupling capacitors have been included
within the module to reduce the number of components
required on the customer’s board. Figure 2 illustrates the
recommended interface circuit.
Compliance Prediction
The real-time diagnostic parameters can be monitored to
alert the system when operating limits are exceeded and
compliance cannot be ensured.
Digital Diagnostic Interface and Serial Identification
The AFCT-575xZ family complies with the SFF-8074i spec-
ification, which defines the module’s serial identification
protocol to use the 2-wire serial CMOS EEPROM protocol
of the ATMEL AT24C01A or similar. Standard SFP EEPROM
bytes 0-255 are addressed per SFF-8074i at memory ad-
dress 0xA0 (A0h).
As an enhancement to the conventional SFP interface
defined in SFF-8074i, the AFCT-5755Z is also compliant
to SFF-8472 (the digital diagnostic interface for SFP). This
enhancement adds digital diagnostic monitoring to stan-
dard SFP functionality, enabling failure prediction, fault
isolation, and component monitoring capabilities.
Fault Isolation
The diagnostic information can allow the host to pinpoint
the location of a link problem and accelerate system ser-
vicing and minimize downtime.
Component Monitoring
As part of the host system monitoring, the real time di-
agnostic information can be combined with system level
monitoring to ensure system reliability.
Application Support
An Evaluation Kit and Reference Designs are available to
assist in evaluation of the AFCT-575xZ SFPs. Please contact
your local Field Sales representative for availability and
ordering details.
V
CC
T
0.1 µF
V
CC
R
0.1 µF
10 µF
1 µH
1 µH
0.1 µF
10 µF
3.3 V
SFP MODULE
HOST BOARD
Figure 3. MSA required power supply filter
4
Operating Temperature
The AFCT-575xZ family is available in either Extended
(-10 to +85°C) or Industrial (-40 to +85°C) temperature
ranges.
Power Supply Noise
The AFCT-575xZ can withstand an injection of PSN on the
V
CC
lines of 100 mV ac without a degradation in eye mask
margin to 10% on the transmitter and a 1 dB sensitivity
penalty on the receiver. This occurs when the product is
used in conjunction with the MSA recommended power
supply filter shown in Figure 3.
Regulatory Compliance
The transceiver regulatory compliance is provided in Table
1 as a figure of merit to assist the designer. The overall
equipment design will determine the certification level.
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
JEDEC/EIA JESD22-A114-A
Bellcore GR1089-CORE
Performance
Class 2 (2000 Volts)
25 kV Air Discharge
10 Zaps at 8 kV (contact discharge) on the
electrical faceplate on panel.
Electromagnetic Interference
(EMI)
FCC Class B
Applications with high SFP port counts are
expected to be compliant; however, margins
are dependent on customer board and chassis
design.
No measurable effect from a 10 V/m field
swept from 80 to 1000 MHz applied to the
transceiver without a chassis enclosure.
CDRH Accession Number: 9521220-137
TUV Certificate Number: 933/21205741/040
UL file # E173874
Immunity
Variation of IEC 61000-4-3
Eye Safety
US FDA CDRH AEL Class 1
EN (IEC) 60825-1, 2,
EN60950 Class 1
Underwriter’s Laboratories and Canadian
Standards Association Joint Component
Recognition for Information Technology
Equipment Including Electrical Business
Equipment
Component Recognition
ROHS Compliance
Reference to EU RoHS Directive 2002/95/EC
5
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