I-PEX Enterprise Solutions for 112 Gbps PAM4 (2022/Mar/18)

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Development Background


In recent years, infrastructure telecommunication, such as servers and switches, have become increasingly faster in the enterprise market.
The challenge is that conventional PCB trace transmission have large insertion losses with limited transmission distance. 
A co-package system also faces the challenge of high-density packaging. I-PEX has begun development of our new LEAPWIRE™/DUALINE™ series 112 Gbps PAM4 using high-speed Twinax Cables and 112Gbps PAM4 board-to-board connection to solve these problems. These products will be used for transmission between chips inside equipment and connection to I/O connectors.

  • LEAPWIRE™ is the new high-speed transmission jumper solution, DUALINE™ series is the actual connector.
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Challenge


The problem is that the existing board transmission pattern (shown in Fig. 1) has high insertion loss in the PCB trace transmission. Also, because of the large connector size of the general jumper harness, the connector is placed far from the heat sink, and the I/O connector is connected through the board, resulting in a large transmission loss (shown in Fig. 2). In our proposed design (shown in Fig. 3), the connector height has a low profile, allowing for placement under the heat sink, putting it closer to the ASIC. Direct connection to I/O connectors is now possible, which helps reduce transmission loss. The small size of the connector also supports airflow measures.


(Fig. 1) PCB trace transmission

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(Fig. 2) Jumper harness transmission

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(Fig. 3) I-PEX LEAPWIRE™ (DUALINE™ 195-HB) Jumper harness transmission
 

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Image of connectors under heat sink
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QSFP-DD to DUALINE™195-HB harness assembly

Transmission distance comparison of PCB trace vs I-PEX LEAPWIRE™ (Twinax Cable)


I-PEX LEAPWIRE™ (Twinax Cable) can transmit approximately 10.3 times farther in the 28 GHz band than PCB transmission.

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Co-Packaging Trend


Co-packaging is intended to address the challenges of bandwidth and power consumption. It is an advanced mixed-mounting technology that combines electronic components with an IC on a single substrate package. In the next step, it is envisioned that optics and electronic switching will be combined on a single substrate package. Reducing power consumption and thermal effects while reducing the footprint using this technology has become a challenge for the efficient support of high-speed networks. The system also allows the package itself to be replaced in the event of a failure, providing greater design flexibility. As previously mentioned, faster and more efficient transmission and higher density packaging are challenges. Smaller connectors and jumper solutions, which are capable of high-speed transmission, are needed.
 

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Co-Package usage image

Introducing I-PEX solutions to solve these issues.
 

  • DUALINE™ 195-HB
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Product Features


  • Supports high-speed transmission, such as 112 Gbps PAM4
    Uses Twinax Cable with excellent signal integrity performance
     
  • Low-profile design (H=3.0 mm)
    Product can be placed under the heatsink, closer to the CPU to reduce transmission loss
     
  • Low-profile design (H=3.0 mm) and small size (D=11.0 mm W=40.0 mm)
    Small product size supports airflow measures in equipment
     
  • Has mechanical lock to prevent un-mating


Product Specifications


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  • DUALINE™ 110-VB-M
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Product Features


  • Supports high-speed transmission such as 112 Gbps PAM4
    Uses Twinax Cable with excellent signal integrity performance
     
  • Supports Co-Package system. Small space-saving product for high-density mounting 
    Multi-pin array, 64 pair (16 differential pair x 4 rows)
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Product Specifications


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Board-to-Board (Optics or other mezzanine applications)


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Product Features


  • Supports high-speed transmission such as 112 Gbps PAM4.
     
  • Supports Co-Package system. Small space-saving product for high-density mounting  
    Height=1.5 mm, Depth=14.9 mm, Width=13.6 mm
    Multi-pin array, 16 pair (4 differential pair x 4 rows) + 40 pin (low-speed signal)
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Product Specifications


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Reference Data for Transmission Characteristic DUALINE™ 195-HB 


Test condition
・    Cable: Twinax Cable, AWG #32, Differential 92ohm
・    Cable length: 300 mm
・    Connector with both ends

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Test results
 

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Others


These products are currently in the prototype stage. 
Please note that product specifications are subject to change. If you need samples, please contact us.