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參數(shù)資料
| 型號(hào)： | AFCT-5760NLZ |
| 元件分類： | 光收發(fā) |
| 英文描述： | FIBER OPTIC TRANSCEIVER, 1261-1360nm, 155Mbps(Tx), 155Mbps(Rx), BOARD/PANEL MOUNT, LC CONNECTOR |
| 封裝： | ROHS COMPLIANT PACKAGE-20 |
| 文件頁數(shù)： | 14/19頁 |
| 文件大?。?/td> | 394K |
| 代理商： | AFCT-5760NLZ |
4
Figure 3. MSA required power supply filter
V
CCT
0.1 F
10 F
1 H
0.1 F
10 F
3.3 V
SFP MODULE
V
CCR
HOST BOARD
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.
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
provides 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.
Digital Diagnostic Interface and Serial Identification
The AFCT-576xZ family complies with the SFF-8074i
specification, 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 address 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 standard SFP functionality, enabling failure
prediction, fault isolation, and component monitoring
capabilities.
Using the 2-wire serial interface, the AFCT-5765Z
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 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
Transmitter 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.
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.
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
pinpoint the location of a link problem and accelerate
system servicing and minimize downtime.
Component Monitoring
As part of the host system monitoring, the real time
diagnostic 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-576xZ SFPs. Please
contact your local Field Sales representative for
availability and ordering details.
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