AFCT-5760xNxZ and AFCT-5765xNxZ
Families of Small Form Factor Pluggable (SFP) Optical Transceivers
for Single-Mode OC3/STM-1 with Optional DMI
Part of the Avago Technologies METRAK Family
Data Sheet
Description
The AFCT-576xZ family of SFP optical transceivers for OC3
offers the customer a range of design options, including
optional DMI (further described later), extended or indus-
trial temperature ranges, and standard push-button or or
bail delatch. The AFCT-5765Z family targets applications
requiring DMI features, and the AFCT-5760Z family is
streamlined for those applications where DMI features
are not needed. Throughout this document, AFCT-576xZ
will refer collectively to the entire product family encom-
passing this range of product features.
Features
ROHS compliant
Optional Digital Diagnostic Monitoring available
- AFCT-5760Z family: without DMI
- AFCT-5765Z family: with DMI
Per SFF-8472, diagnostic features on AFCT-5765Z
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
Part Number Options
The AFCT-576xZ family consists of the following prod-
ucts:
With DMI
Part Number
Temperature
Design
AFCT-5765NLZ
Extended*
Standard
AFCT-5765NPZ
Extended*
Bail
AFCT-5765ANLZ
Industrial*
Standard
AFCT-5765ANPZ
Industrial*
Bail
Without DMI
Part Number
AFCT-5760NLZ
AFCT-5760NPZ
AFCT-5760ANLZ
AFCT-5760ANPZ
Compliant with SFF-8074i SFP transceiver specifica-
tion
Compliant with ITU-T G957 STM-1 L1.1 (40km) Opti-
cal Interface
Compliant with Telcordia GR253 OC3 LR-1 (40km)
Optical Interface
Class 1 CDRH/IEC 825 eye safety compliant
Operating case temperature range
–10 °C to +85 °C (Extended)
–40 °C to +85 °C (Industrial)
Temperature
Extended*
Extended*
Industrial*
Industrial*
Design
Standard
Bail
Standard
Bail
Multitrate operation from 125 Mb/s to 155 Mb/s
LC duplex fiber connector
Manufactured in an ISO 9001 compliant facility
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
* Extended Temperature Range is -10 to 85 degrees C
Industrial Temperature Range is -40 to 85 degrees C
Related Products
AFCT-5755Z family of OC12 SFP transceivers with
DMI
AFCT-5745L/P family of OC48 SFP transceivers with
DMI
General Features
The AFCT-576xZ family of SFP optical transceivers are high
performance, cost effective modules for serial optical data
communications applications ranging from 125-155 Mbps.
They are designed to provide SONET/SDH compliant con-
nections for 155 Mbps at short and intermediate reach
links. This includes specifications for the signal coding,
optical fiber and connector types, optical and electrical
transmitter characteristics, optical and electrical receiver
characteristics, jitter characteristics, and compliance test-
ing methodology for the aforementioned. These transceiv-
ers are qualified in accordance with GR-468-CORE.
The transmitter section of the transceivers incorporate a
1300nm Fabry Perot (FP) laser. For each device the receiver
section uses an MOVPE grown planar PIN photodetector
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 detec-
tor and a preamplifier mounted in an optical subassembly.
This optical subassembly is coupled to a postamplifier/de-
cision circuit on a circuit board.
The AFCT-576xZ 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-576xZ 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
MOD-DEF2 (SDA)
Controller & Memory
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
0.1 µF
1 µH
1 µH
3.3 V
VCC,T
0.1 µF
4.7 K to 10 KΩ
Tx_DISABLE
Tx_FAULT
VREFR
TX[0:9]
SO–
TBC
EWRAP
PROTOCOL
IC
SFP MODULE
4.7 K to 10 KΩ
Tx_FAULT
VREFR
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-576xZ 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-5765Z pro-
vides real time access to transceiver internal supply volt-
age and temperature, transmitter output power, laser
bias current and receiver average input power, allowing
a host to predict 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.
The I2C accessible memory page address 0xB0 is used
internally by SFP for the test and diagnostic purposes
and it is reserved.
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).
Functional Data I/O
Avago’s AFCT-576xZ 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.
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.
Digital Diagnostic Interface and Serial Identification
The AFCT-576xZ 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-5765Z 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.
Compliance Prediction
The real-time diagnostic parameters can be monitored
to alert the system when operating limits are exceeded
and compliance cannot be ensured.
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 the host system monitoring, the real time di-
agnostic information can be combined with system level
monitoring to ensure system reliability.
1 µH
V
CC
T
0.1 µF
1 µH
V
CC
R
0.1 µF
10 µF
0.1 µF
10 µF
3.3 V
Application Support
An Evaluation Kit and Reference Designs are available to
assist in evaluation of the AFCT-576xZ SFPs. Please con-
tact your local Field Sales representative for availability
and ordering details.
SFP MODULE
HOST BOARD
Figure 3. MSA required power supply filter
4
Operating Temperature
The AFCT-576xZ family is available in either Extended
(-10 to +85°C) or Industrial (-40 to +85°C) temperature
ranges.
Power Supply Noise
The AFCT-576xZ 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 electri-
cal faceplate on panel.
Electromagnetic Interference
(EMI)
Immunity
FCC Class B
Applications with high SFP port counts are ex-
pected to be compliant; however, margins are de-
pendent 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: 9521220-137T
UV Certificate Number: 933/21205741/040
UL file # E173874
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 Informa-
tion Technology Equipment Including
Electrical Business Equipment
Component Recognition
ROHS Compliance
Reference to EU RoHS Directive 2002/95/EC
5
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