100Gb/s 100m QSFP28 Transceiver (QSFP28-100G-SR4) Hot Pluggable, MTP/MPO Connector, 850nm, VCSEL, Multimode

Features:

• 4 independent full-duplex channels
• Up to 27.95Gbps per channel bandwidth
• Aggregate bandwidth of > 100Gbps
• MTP/MPO optical connector
• QSFP28 MSA compliant
• 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
•  Digital diagnostic capabilities
• Single +3.3V power supply operating
• Temperature range 0°C to 70°C
• RoHS Compliant Part

Applications:

• Local Area Network (LAN)
• Wide Area Network (WAN)
• Ethernet switches and router applications

Description:

The QSFP28-100G-SR4 is a transceiver module designed for 100m optical communication applications. The design is compliant to 100GbASE-SR4 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 25.78Gbps 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.

An optical fiber ribbon cable with an MPO/MTP connector at each end plugs into the QSFP28 module receptacle. The orientation of the ribbon cable is “keyed” and guide pins are present inside the module’s receptacle to ensure proper alignment. The cable usually has no twist (key up to key up) to ensure proper channel to channel alignment. Electrical connection is achieved though a z-pluggable 38-pin IPASS® connector.

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 QSFP28-100G-SR4 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 SR4. 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.

Figure1: 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.

• Optical Interface Lanes and Assignment

Below figure shows the orientation of the multi-mode fiber facets of the optical connector

Outside View of the QSFP28 Module MPO

Lane Assignment Table

• Recommended Circuit

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• Mechanical Dimensions