PCIe Interposers & Taps

SerialTek provides two market-leading PCI Express® (PCIe®) protocol analysis solutions, the BusXpert PRO and the BusXpert Micro II, for the design and test of products that integrate PCIe technology; this includes host bus storage adapters, computer systems, servers and storage products.

A wide range of cost-effective and flexible probing options are available for BusXpert Analyzer users. These interposer solutions are designed to provide maximum performance and flexibility when capturing PCI Express communication data between hosts and devices; they include slot, M.2 and U.2 interposers.

Cost-effective, reliable, and high performance SFF-8644 cables are used to connect an interposer to the SerialTek PCIe Analyzer. These cables are rated at 12 Gbps, making them a suitable interconnect for PCIe analysis; unlike some other high speed cables, SFF-8644 cables are easier to handle and easier to use. One competing solution utilizes bulky, expensive and hand-built iPass-type cabling that can fail in the field.

All SerialTek interposers are compliant with the PCI Express 1.x, 2.x and 3.0 specifications; they are rated for 8 GT/s yet they also inter-operate at lower data rates.

Key Features

  • Compliant with PCI Express 1.x, 2.x and 3.0 specifications
  • Wide variety of interposers designed to help accurately capture PCIe data traffic at all line rates including 8 GT/s, 5 GT/s and 2.5 GT/s
  • Interposers offered include: slot, M.2, and U.2 interposers
  • Next-gen Slot Interposer requires no calibration
  • “Passive” tapping to avoid masking, hiding or “cleaning up” electrical and/or link issues
  • Low-cost, flexible, high performance cabling for reliable analyzer to interposer connections


  • Slot Interposers (3 versions of each board type)
    • x1, x4 and x8
    • Up to Gen 3, 8 GT/s data rates
    • Oscilloscopes output option
    • SFF-8644 cabling between analyzer and slot interposers
    • Dimensions:
      • 10.125” (length) x 6.5” (height) / 257mm x 165mm
      • Short version: 9.88” (length) x 3.6” (height) / 252mm x 91mm
    • Weight:
      • x1 & x4:
        • 9.125 ozs / 269 grams
        • Short version: 5.4 ozs / 153 grams
      • x8:
        • 10 ozs / 284 grams
        • Short version: 5.86 ozs / 166 grams
  • M.2
    • Up to x4, Gen 3, 8 GT/s data rates
    • Drive Length Support: 30mm, 42mm, 60mm and 110mm
    • Dimensions: 8.78” (length) x 5.28” (width) / 223mm x 134mm
    • Weight: 1.55 ozs / 46 grams (without host slot adapter board)
  • U.2 (2 versions – a regular length and an extended length version)
    • Up to x4, Gen 3, 8 GT/s data rates
    • Dimensions:
      • 14” (length) x 6.06” (width) / 356mm x 154mm
      • Extended Version: 18.56” (length) x 6.13” (width) / 471mm x 156mm
    • Weight:
      • 13.10 ozs / 372 grams
        Extended Version: 15.70 ozs / 446 grams

Contact the Sales team at Serial Cables with any inquiries for SerialTek products at (303)495-2320 or sales@serialcables.com