参数资料
型号: FTRJ1323P1WTR
元件分类: 光收发
英文描述: FIBER OPTIC TRANSCEIVER, 1261-1360nm, 155Mbps(Tx), 155Mbps(Rx), PANEL MOUNT, LC CONNECTOR
文件页数: 5/8页
文件大小: 187K
代理商: FTRJ1323P1WTR
FTRJ1323P1xTR
Digital Diagnostic Functions
Finisar FTRJ1323P1xTR SFP transceivers support the 2-wire serial communication protocol as defined in the
draft SFP MSA1. It is very closely related to the E2PROM defined in the GBIC standard, with the same
electrical specifications.
The standard SFP serial ID provides access to identification information that describes the transceiver’s
capabilities, standard interfaces, manufacturer, and other information.
Additionally, Finisar SFP transceivers provide a unique enhanced digital diagnostic monitoring interface,
which allows real-time access to device operating parameters such as transceiver temperature, laser bias
current, transmitted optical power, received optical power and transceiver supply voltage. It also defines a
sophisticated system of alarm and warning flags, which alerts end-users when particular operating
parameters are outside of a factory set normal range.
The SFP MSA defines a 256-byte memory map in E2PROM that is accessible over a 2-wire serial interface at
the 8 bit address 1010000X (A0h). The digital diagnostic monitoring interface makes use of the 8 bit address
1010001X (A2h), so the originally defined serial ID memory map remains unchanged. The interface is
identical to, and is thus fully backward compatible with both the GBIC Specification and the SFP Multi Source
Agreement. The complete interface is described in Finisar Application Note AN-2030: “Digital Diagnostics
Monitoring Interface for SFP Optical Transceivers”.
The operating and diagnostics information is monitored and reported by a Digital Diagnostics Transceiver
Controller (DDTC) inside the transceiver, which is accessed through a 2-wire serial interface. When the serial
protocol is activated, the serial clock signal (SCL, Mod Def 1) is generated by the host. The positive edge
clocks data into the SFP transceiver into those segments of the E2PROM that are not write-protected. The
negative edge clocks data from the SFP transceiver. The serial data signal (SDA, Mod Def 2) is bi-directional
for serial data transfer. The host uses SDA in conjunction with SCL to mark the start and end of serial
protocol activation. The memories are organized as a series of 8-bit data words that can be addressed
individually or sequentially.
For more information, please see the SFP MSA documentation1 or Finisar Application Note AN-2030.
Digital diagnostics for the FTRJ1323P1xTR are externally calibrated by default.
Please note that evaluation board FDB-1018 is available with Finisar ModDEMO software that allows simple
to use communication over the 2-wire serial interface.
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