Good Quality SFP Module – 100Gb/s QSFP28 1310nm 20km LR4 LC Transceiver JHA-Q28C20 – JHA

Features:                                              

◊ 4 lanes MUX/DEMUX design

◊ Integrated LAN WDM TOSA / ROSA for up to 20 km reach over SMF

◊ Support 100GBASE-LR4 for line rate of 103.125Gbps and OTU4 for line rate of 111.81Gbps

◊ Aggregate bandwidth of > 100Gbps

◊ Duplex LC connectors

◊ Compliant with IEEE 802.3-2012 Clause 88 standard IEEE 802.3bm CAUI-4 chip to module  electrical standard ITU-T G.959.1-2012-02 standard ·

◊ Single +3.3V power supply operating  

◊ Built-in digital diagnostic functions  

◊ Temperature range 0°C to 70°C  

◊ RoHS Compliant Part

◊ Support FEC(Forward Error Correction)

Applications:

◊ Local Area Network (LAN)

◊ Wide Area Network (WAN)

◊ Ethernet switches and router applications

Description:

The JHA-Q28C20 is a transceiver module designed for 20km optical communication applications. The design is compliant to 100GbASE-LR4 of the IEEE 802.3-2012 Clause 88 standard IEEE 802.3bm CAUI-4 chip to module electrical standard ITU-T G.959.1-2012-02 standard . The module converts 4 inputs channels (ch) of 25.78 Gbps to 27.95Gbps electrical data to 4 lanes optical signals, and multiplexes them into a single channel for 100Gb/s optical transmission. Reversely, on the receiver side, the module optically de-multiplexes a 100Gb/s input into 4 lanes signals, and converts them to 4 lanes output electrical data.

The central wavelengths of the 4 lanes are 1296 nm, 1300 nm, 1305 nm and 1309 nm . It contains a duplex LC connector for the optical interface and a 38-pin connector for the electrical interface. To minimize the optical dispersion in the long-haul system, single-mode fiber (SMF) has to be applied in this module.

The product is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP28 Multi-Source Agreement (MSA). It has been designed to meet the harshest external operating conditions including temperature, humidity and EMI interference.

The module operates from a single +3.3V power supply and LVCMOS/LVTTL global control signals such as Module Present, Reset, Interrupt and Low Power Mode are available with the modules. A 2-wire serial interface is available to send and receive more complex control signals and to obtain digital diagnostic information. Individual channels can be addressed and unused channels can be shut down for maximum design flexibility.

The JHA-Q28C20 is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP28 Multi-Source Agreement (MSA). It has been designed to meet the harshest external operating conditions including temperature, humidity and EMI interference. The module offers very high functionality and feature integration, accessible via a two-wire serial interface.

• Absolute Maximum Ratings

• Recommended Operating Environment:

• Electrical Characteristics (T_OP = 0 to 70 °C, VCC = 3.13 to 3.47 Volts

Note:

1. 20～80%

• Optical Parameters(TOP = 0 to 70 °C, VCC = 3.0 to 3.6 Volts)

Note

1. 12dB Reflection 

• Diagnostic Monitoring Interface

Digital diagnostics monitoring function is available on all QSFP28 LR4. A 2-wire serial interface provides user to contact with module. The structure of the memory is shown in flowing. The memory space is arranged into a lower, single page, address space of 128 bytes and multiple upper address space pages. This structure permits timely access to addresses in the lower page, such as Interrupt Flags and Monitors. Less time critical time entries, such as serial ID information and threshold settings, are available with the Page Select function. The interface address used is A0xh and is mainly used for time critical data like interrupt handling in order to enable a one-time-read for all data related to an interrupt situation. After an interrupt, IntL has been asserted, the host can read out the flag field to determine the affected channel and type of flag.

Page02 is User EEPROM and its format decided by user.

The detail description of low memory and page00.page03 upper memory please see SFF-8436 document.

• Timing for Soft Control and Status Functions

Note：

1. Power on is defined as the instant when supply voltages reach and remain at or above the minimum specified value.

2. Fully functional is defined as IntL asserted due to data not ready bit, bit 0 byte 2 de-asserted.

3. Measured from falling clock edge after stop bit of read transaction.

4. Measured from falling clock edge after stop bit of write transaction.

• Transceiver Block Diagram

• Pin Assignment

Diagram of Host Board Connector Block Pin Numbers and Name

• Pin Description

Notes:

1. GND is the symbol for single and supply(power) common for QSFP28 modules, All are common within the QSFP28 module and all module voltages are referenced to this potential otherwise noted. Connect these directly to the host board signal common ground plane. Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V.
2. VccRx, Vcc1 and VccTx are the receiver and transmitter power suppliers and shall be applied concurrently. Recommended host board power supply filtering is shown below. VccRx, Vcc1 and VccTx may be internally connected within the QSFP28 transceiver module in any combination. The connector pins are each rated for maximum current of 500mA.

• Recommended Circuit

• Mechanical Dimensions