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Technical content
Features
Diagnostic features per SFF-8472 “Diagnostic Monitoring Interface for Optical Transceivers” Compliant to Restriction on Hazardous Substances (RoHS) directive Real time monitors of: – Transmitted average optical power – Received average optical power – Laser bias current – Temperature – Supply voltage High performance 1310 nm DFB laser Wide Temperature and Supply Voltage Operation Management interface specifi cations per SFF Committee SFF 8431 Mechanical specifi cations per SFF Committee SFF
8432 Improved Pluggable Formfactor "IPF"
Up to 20km with single mode fi ber for 7.373 Gb/s Up to 20km with single mode fi ber for 6.144 Gb/s LC Duplex optical connector interface conforming to ANSI TIA/EIA604-10 (FOCIS 10) IEC 60825-1 Class 1/CDRH Class 1 laser eye safe Compatible with Fibre Channel and Gigabit Ethernet
applications
Wireless and cellular base station system interconnect: – OBSAI rates 6.144 Gb/s, 3.072 Gb/s, 1.536 Gb/s – CPRI rates 7.373 Gb/s, 2.458 Gb/s, 1.229 Gb/s
Description
The AFCT-57J7ATPZ optical transceiver supports high- speed serial links over singlemode optical fi ber at signaling rates up to 7.373 Gb/s. Compliant with Small Form Pluggable (SFP) Multi Source Agreement (MSA) mechani- cal and electrical specifi cations, ANSI Fibre Channel FC-PI-3 and compatible with IEEE 802.3 for gigabit applications. As an enhancement to the conventional SFP interface defi ned in SFF-8074i, the AFCT-57J7ATPZ is compliant to SFF-8472 (digital diagnostic interface for SFP). Using the 2-wire serial interface defi ned in the SFP MSA, the AFCT-57J7ATPZ provides real time temperature, supply voltage, laser bias current, laser average output power and received average input power. This information is in addition to the conventional SFP data. The digital diagnos- tic 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).
Related Products
AFBR-57J7APZ: 850nm +3.3V LC SFP for 7.373/6.144 GBd CPRI/OBSAI AFBR-57J5APZ: 850nm +3.3V LC SFP for 3.072/2.456 GBd CPRI/OBSAI AFCT-57J5APZ: 1310nm +3.3V LC SFP for 3.072/2.456 GBd CPRI/OBSAI AFCT-57J5ATPZ: 1310nm +3.3V LC SFP for 3.072/2.456 GBd CPRI/OBSAI
The AFCT-57J7ATPZ can be installed in any SFF-8074i compliant Small Form Pluggable (SFP) port regardless of host equipment operating status. The AFCT-57J7ATPZ 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). Digital Diagnostic Interface and Serial Identifi cation The 2-wire serial interface is based on ATMEL AT24C01A series EEPROM protocol and signaling detail. Convention- al SFP 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 diag- nostic information provides the opportunity for Predic- tive Failure Identifi cation, Compliance Prediction, Fault Isolation and Component Monitoring. Predictive Failure Identifi cation The AFCT-57J7ATPZ predictive failure feature allows a host to identify potential link problems before system per- formance is impacted. Prior identifi cation of link problems enables a host to service an application via “fail over” to a redundant link or replace a suspect device, main taining 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). Compliance Prediction Compliance prediction is the ability to determine if an optical transceiver is operating within its operating and en- vironmental requirements. AFCT-57J7ATPZ 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 transmission. 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-57J7ATPZ 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 fl ags Tx_Disable and Rx Loss of Signal (LOS) are mirrored in memory and available via the two-wire serial interface. Component Monitoring Component evaluation is a more casual use of the AFCT- 57J7ATPZ 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 fi eld qual- ifi cation. For example, temperature per module can be observed in high density applications to facilitate thermal evaluation of blades, PCI cards and systems.
Figure 1. Transceiver functional diagram. open collector output (pull-up required on the host board). two-wire serial interface (address A2, byte 110, bit 2). unsafe condition beyond the scope of Class 1 certifi cation.
There are no user serviceable parts nor maintenance require- ments for the AFCT-57J7ATPZ. All mechanical adjustments are made at the factory prior to shipment. Tampering with, modifying, misusing or improperly handling the AFCT- 57J7ATPZ 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-57J7ATPZ to a light source not compliant with ANSI FC-PI or IEEE 802.3 specifi cations, 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 manufactur ing 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.
Ordering Information
Please contact your local fi eld 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 Semiconductor Products Customer Response Center at 1-800-235-0312. For information related to SFF Committee documentation visit www.sff com- mittee.org. Regulatory Compliance The AFCT-57J7ATPZ complies with all applicable laws and regulations as detailed in Table 1. Certifi cation level is dependent on the overall confi guration of the host equipment. The transceiver performance is off ered as a fi gure of merit to assist the designer. Electrostatic Discharge (ESD) The AFCT-57J7ATPZ 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 circumstances. The fi rst 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 precau- tions. These include using of grounded wrist straps, work- benches and fl oor 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. Receiver Section The receiver section includes the Receiver Optical Sub- Assembly (ROSA) and the amplifi cation/quantization circuitry. The ROSA, containing a PIN photo diode and custom transimped ance amplifi er, 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- plifi cation and quantization. Receiver Loss of Signal (Rx_LOS) The post-amplifi cation 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 defi nite optical fault has occurred. Rx_LOS can also be monitored via the two-wire serial interface (address A2h, byte 110, bit 1). Functional Data I/O The AFCT-57J7ATPZ interfaces with the host circuit board through twenty I/O pins (SFP electrical connector) iden- tifi ed by function in Table 2. The board layout for this interface is depicted in Figure 6. The AFCT-57J7ATPZ high speed transmit and receive in- terfaces 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, Rx_LOS 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-57J7ATPZ to supporting physical layer ICs. Timing for MSA compliant control signals implemented in the transceiver are listed in Figure 4. Application Support An Evaluation Kit and Reference Designs are available to assist in evaluation of the AFCT-57J7ATPZ. Please contact your local Field Sales representative for availability and ordering details.
Table 1. Regulatory Compliance contacted by a Human Body Model probe. with device inserted into a panel. to the Optical Connector connector without damage. (EMI) CENELEC EN55022 Class B board and chassis design. from a 10 V/m swept from 10 MHZ to 1 GHz. nyls, and polybrominated biphenyl ethers. CENELEC EN55022 (CISPR 22) in Europe and VCCI in Japan. 57J7ATPZ exceeds typical industry standards. UL 94V-0 fl ame retardant plastic.
- TX_FAULT is an open collector/drain output, which must be pulled up with a 4.7 k – 10 k resistor on the host board. When high, this output
indicates a laser fault of some kind. Low indicates normal operation. In the low state, the output will be pulled to < 0.8 V.
- TX_DISABLE is an input that is used to shut down the transmitt er optical output. It is internally pulled up (within the tran sceiver) with a 6.8 k
- The signals Mod-Def 0, 1, 2 designate the two wire serial interface pins. They must be pulled up with a 4.7 k – 10 k resistor on the host board.
- RX_LOS (Rx Loss of Signal) is an open collector/drain output that must be pulled up with a 4.7 k – 10 k resistor on the host board. When high, this
operation. In the low state, the output will be pulled to < 0.8 V.
- RD-/+ designate the diff erential receiver outputs. They are AC coupled 100 diff erential lines which should be terminated with 100 diff erential
between 370 and 850 mV diff erential (185 – 425 mV single ended) when properly terminated.
- VccR and VccT are the receiver and transmitter power supplies. They are defi ned at the SFP connector pin. The maximum supply current is 300 mA
and the associated in-rush current will typically be no more than 30 mA above steady state after 2 microseconds.
- TD-/+ designate the diff erential transmitter inputs. They are AC coupled diff erential lines with 100 diff erential termination inside the module.
Table 2. Pin Description
1 VeeT Transmitter Ground
2 TX_FAULT Transmitter Fault Indication – High indicates a fault condition Note 1
3 TX_DISABLE Transmitter Disable – Module optical output disables on high or open Note 2
4 MOD-DEF2 Module Defi nition 2 – Two wire serial ID interface data line (SDA) Note 3
5 MOD-DEF1 Module Defi nition 1 – Two wire serial ID interface clock line (SCL) Note 3
6 MOD-DEF0 Module Defi nition 0 – Grounded in module (module present indicator) Note 3
7 No Connect Internal pull down 100kOhm to ground
8 RX_LOS Loss of Signal – High indicates loss of received optical signal Note 4
9 No Connect Internal pull down 100kOhm to ground
10 VeeR Receiver Ground
11 VeeR Receiver Ground
12 RD- Inverse Received Data Out Note 5
13 RD+ Received Data Out Note 5
14 VeeR Receiver Ground
17 VeeT Transmitter Ground
18 TD+ Transmitter Data In Note 7
19 TD- Inverse Transmitter Data In Note 7
20 VeeT Transmitter Ground
Table 3. Absolute Maximum Ratings
- Absolute Maximum Ratings are those values beyond which damage to the device may occur if these limits are exceeded for other than a short
period of time. See Reliability Data Sheet for specifi c reliability performance.
- Between Absolute Maximum Ratings and the Recommended Operating Conditions functional performance is not intended, device rel iability is
not implied, and damage to the device may occur over an extended period of time.
- The module supply voltages, V CCT and VCCR must not diff er by more than 0.5 V or damage to the device may occur.
Table 4. Recommended Operating Conditions
- The Ambient Operating T emperature limitations are based on the Case Operating Temperature limitations and are subject to th e host system
- Recommended Operating Conditions are those values for which functional performance and device reliability is implied.
Table 5. Transceiver Electrical Characteristics
- Filter per SFP specifi cation is required on host board to remove 10 Hz to 2 MHz content.
- Pulled up externally with a 4.7 k – 10 k resistor on the host board to 3.3 V.
- Pulled up externally with a 4.7 k – 10 k resistor on the host board to 3.3 V.
Table 6. Transmitter and Receiver Electrical Characteristics
- Internally AC coupled and terminated (100 Ohm diff erential).
- Internally AC coupled but requires an external load termination (100 Ohm diff erential).
- Contributed DJ is measured on an oscilloscope in average mode with 50% threshold and K28.5 pattern.
- 20%-80% electrical rise & fall times measured with a 500 MHz signal utilizing a 1010 data pattern.
- Measured at an input optical power of 154 W.
Table 7. Transmitter Optical Characteristics
- Max Pout is the lesser of Class 1 safety limits (CDRH and EN 60825) or receiver power, max.
- Into 9/125 m single-mode optical fi ber.
- Contributed DJ is measured on an oscilloscope in average mode with 50% threshold and K28.5 pattern. Contributed TJ is the sum of contributed
worst case specifi ed component jitter input.
Table 8. Receiver Optical Characteristics
- Input Optical Modulation Amplitude (commonly known as sensitivity) requires a valid 8B/10B encoded input.
Table 9. Transceiver Timing Characteristics
- Time from rising edge of TX_DISABLE to when the optical output falls below 10% of nominal.
- Time from falling edge of TX_DISABLE to when the modulated optical output rises above 90% of nominal.
- Time from power on or falling edge of Tx_Disable to when the modulated optical output rises above 90% of nominal.
- From power on or negation of TX_FAULT using TX_DISABLE.
- Time TX_DISABLE must be held high to reset the laser fault shutdown circuitry.
- Time from loss of optical signal to Rx_LOS Assertion.
- Time from valid optical signal to Rx_LOS De-Assertion.
- Time from two-wire interface assertion of TX_DISABLE (A2h, byte 110, bit 6) to when the optical output falls below 10% of nominal. Measured from
falling clock edge after stop bit of write transaction.
- Time from two-wire interface de-assertion of TX_DISABLE (A2h, byte 110, bit 6) to when the modulated optical output rises a bove 90% of
- Time from fault to two-wire interface TX_FAULT (A2h, byte 110, bit 2) asserted.
- Time for two-wire interface assertion of Rx_LOS (A2h, byte 110, bit 1) from loss of optical signal.
- Time for two-wire interface de-assertion of Rx_LOS (A2h, byte 110, bit 1) from presence of valid optical signal.
- From power on to data ready bit asserted (A2h, byte 110, bit 0). Data ready indicates analog monitoring circuitry is functional.
- Time from power on until module is ready for data transmission over the serial bus (reads or writes over A0h and A2h).
- Time from stop bit to completion of a 1-8 byte write command.
Table 10. Transceiver Digital Diagnostic Monitor (Real Time Sense) Characteristics Transceiver Internal Temperature T INT ±3.0 °C Temperature is measured internal to the transceiver. Accuracy Valid from = -10°C to 85°C case temperature. voltage at the SFP Vcc pin. Valid over 3.3 V ± 10%. INT ±10 % I INT is better than ±10% of the nominal value. Output Power Accuracy 100 W to 500 W, average. Accuracy 30 W to 500 W, average. Figure 4. Transceiver timing diagrams (module installed except where noted).
- The IEEE Organizationally Unique Identifi er (OUI) assigned to Avago Technologies is 00-17-6A (3 bytes of hex).
- Laser wavelength is represented in 16 unsigned bits. The hex representation of 1310 (nm) is 051E.
- Addresses 63 and 95 are checksums calculated (per SFF-8472 and SFF-8074) and stored prior to product shipment.
- Addresses 68-83 specify the AFCT-57J7ATPZ ASCII serial number and will vary on a per unit basis.
- Addresses 84-91 specify the AFCT-57J7ATPZ ASCII date code and will vary on a per date code basis.
Table 12. EEPROM Serial ID Memory Contents – Conventional SFP Memory (Address A0h)
Table 13: EEPROM Serial ID Memory Contents – Enhanced Feature Set Memory (Address A2h) Byte # Byte # Byte # Decimal Notes Decimal Notes Decimal Notes
0 Temp H Alarm MSB [1] 26 Tx Pwr L Alarm MSB [4] 104 Real Time Rx average
M S B [5]
1 Temp H Alarm LSB [1] 27 Tx Pwr L Alarm LSB [4] 105 Real Time Rx average
L S B [5]
2 Temp L Alarm MSB [1] 28 Tx Pwr H Warning MSB [4] 106 Reserved
3 Temp L Alarm LSB [1] 29 Tx Pwr H Warning LSB [4] 107 Reserved
4 Temp H Warning MSB [1] 30 Tx Pwr L Warning MSB [4] 108 Reserved
5 Temp H Warning LSB [1] 31 Tx Pwr L Warning LSB [4] 109 Reserved
6 Temp L Warning MSB [1] 32 Rx Pwr H Alarm MSB [5] 110 Status/Control - See
7 Temp L Warning LSB [1] 33 Rx Pwr H Alarm LSB [5] 111 Reserved
8 Vcc H Alarm MSB [2] 34 Rx Pwr L Alarm MSB [5] 112 Flag Bits - See Table 15
9 Vcc H Alarm LSB [2] 35 Rx Pwr L Alarm LSB [5] 113 Flag Bits - See Table 15
10 Vcc L Alarm MSB [2] 36 Rx Pwr H Warning MSB [5] 114 Reserved
11 Vcc L Alarm LSB [2] 37 Rx Pwr H Warning LSB [5] 115 Reserved
12 Vcc H Warning MSB [2] 38 Rx Pwr L Warning MSB [5] 116 Flag Bits - See Table 15
13 Vcc H Warning LSB [2] 39 Rx Pwr L Warning LSB [5] 117 Flag Bits - See Table 15
14 Vcc L Warning MSB [2] 40-55 Reserved 118-127 Reserved
15 Vcc L Warning LSB [2] 56-94 External Calibration Constants [6] 128-247 Customer Writeable
16 Tx Bias H Alarm MSB [3] 95 Checksum for Bytes 0-94 [7] 248-255 Vendor Specifi c
17 Tx Bias H Alarm LSB [3] 96 Real Time Temperature MSB [1]
18 Tx Bias L Alarm MSB [3] 97 Real Time Temperature LSB [1]
19 Tx Bias L Alarm LSB [3] 98 Real Time Vcc MSB [2]
20 Tx Bias H Warning MSB [3] 99 Real Time Vcc LSB [2]
21 Tx Bias H Warning LSB [3] 100 Real Time Tx Bias MSB [3]
22 Tx Bias L Warning MSB [3] 101 Real Time Tx Bias LSB [3]
23 Tx Bias L Warning LSB [3] 102 Real Time Tx Power MSB [4]
24 Tx Pwr H Alarm MSB [4] 103 Real Time Tx Power LSB [4]
25 Tx Pwr H Alarm LSB [4]
Notes: 1. Temperature (Temp) is decoded as a 16 bit signed twos compliment integer in increments of 1/256°C. 2. Supply Voltage (Vcc) is decoded as a 16 bit unsigned integer in increments of 100 V. 3. Laser bias current (Tx Bias) is decoded as a 16 bit unsigned integer in increments of 2 A. 4. Transmitted average optical power (Tx Pwr) is decoded as a 16 bit unsigned integer in increments of 0.1 W. 5. Received average optical power (Rx Pwr) is decoded as a 16 bit unsigned integer in increments of 0.1 W. 6. Bytes 55-94 are not intended for use with AFCT-57J7ATPZ, but have been set to default values per SFF-8472. 7. Byte 95 is a checksum calculated (per SFF-8472) and stored prior to product shipment.
Table 14. EEPROM Serial ID Memory Contents – Soft Commands (Address A2h, Byte 110)
7 TX_ DISABLE State Digital state of SFP TX_ DISABLE Input Pin (1 = TX_DISABLE asserted) Note 1
6 Soft TX_ DISABLE Read/write bit for changing digital state of TX_DISABLE function Note 1, 2
5 Reserved
4 Reserved
3 Reserved
2 TX_FAULT State Digital state of the SFP TX_FAULT output pin (1 = TX_FAULT asserted) Note 1
1 RX_LOS State Digital state of the SFP RX_LOS output pin (1 = RX_LOS asserted) Note 1
- The response time for soft commands of the AFCT-57J7ATPZ is 100 msec as specifi ed by the MSA SFF-8472.
Table 15. EEPROM Serial ID Memory Contents – Alarms and Warnings (Address A2h, Bytes 112, 113, 116, 117)
6 Temp Low Alarm Set when transceiver internal temperature exceeds low alarm threshold
5 Vcc High Alarm Set when transceiver internal supply voltage exceeds high alarm threshold
4 Vcc Low Alarm Set when transceiver internal supply voltage exceeds low alarm threshold
3 Tx Bias High Alarm Set when transceiver laser bias current exceeds high alarm threshold
2 Tx Bias Low Alarm Set when transceiver laser bias current exceeds low alarm threshold
1 Tx Power High Alarm Set when transmitted average optical power exceeds high alarm threshold
0 Tx Power Low Alarm Set when transmitted average optical power exceeds low alarm threshold
6 Rx Power Low Alarm Set when received optical power exceeds low alarm threshold
6 Temp Low Warning Set when transceiver internal temperature exceeds low warning threshold
5 Vcc High Warning Set when transceiver internal supply voltage exceeds high warning threshold
4 Vcc Low Warning Set when transceiver internal supply voltage exceeds low warning threshold
3 Tx Bias High Warning Set when transceiver laser bias current exceeds high warning threshold
2 Tx Bias Low Warning Set when transceiver laser bias current exceeds low warning threshold
1 Tx Power High Warning Set when transmitted average optical power exceeds high warning threshold
0 Tx Power Low Warning Set when transmitted average optical power exceeds low warning threshold
6 Rx Power Low Warning Set when received optical power exceeds low warning threshold
Figure 5. Module drawing.
Figure 6. SFP host board mechanical layout.
0.06 L A S B S
- PADS AND VIAS ARE CHASSIS GROUND
- THROUGH HOLES, PLATING OPTIONAL
- HATCHED AREA DENOTES COMPONENT
Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies in the United States and other countries. Data subject to change. Copyright © 2005-2011 Avago Technologies. All rights reserved. Figure 7. SFP assembly drawing. wash, IR refl ow, or wave soldering processes.