EKF - Short Profile
EKF - Short Profile


XMC Mezzanine Module
PCI Express® External Cabling • Host Side Adapter

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Product Information
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XMC Overview
DC2-STAG - PCIe® External Cabling Host Adapter
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DC2-STAG XMC Mezzanine Module

PCI Express® External Cabling • Host Side Adapter

Most computer systems are based on the PCI Express® standard as a high speed backbone for interconnection of peripheral components with a host CPU. Typically all PCI Express® based devices are located closely in a common enclosure.

The PCI-SIG PCI Express® External Cabling Specification addresses extended applications, such as split-systems or I/O expansion by means of a suitable copper cable, available e.g. for a x 4 PCI Express® link, up to 7m length. When used with an AOC (Active Optical Cable), distances of up to 300m can be bridged between host and target systems.

Coupling systems by PCI Express® is a solution which allows significantly more throughput and lower latency compared e.g. to 1 or 10 Gigabit Ethernet. Thus, remote target systems become a genuine part of the host.

The DC2-STAG is a XMC style mezzanine card, designed for dual PCIe x 4 external cabling (host system adapter). The board is provided with two PCIe x 4 front panel connectors, for attachment of one or two remote target systems via PCI Express®.

For optimum performance, the DC2-STAG requires a PCIe x 8 Gen2 capable XMC carrier board. This would allow both cabling connectors to be operated simultaneously with PCIe Gen2 speed, at full throughput. For typical applications, a PCIe x 4 based XMC carrier may be also adequate.

The on-board PCIe Gen2 packet switch splits the upstream link into two equal downstream links (x 4), each delivering up to 20GT/s to an associated target system. Dual clocking is provided on the DC2-STAG, for usage of optical cables (AOC) in a SSC host system.

DC2-STAG PCI Express® External Cabling • Host Side Adapter

DC2-STAG • XMC Module • PCIe® External Cabling Host Side Adapter

DC2-STAG - Simplified Block Diagram

DC2-STAG - Simplified Block Diagram
Feature Summary

  • Form factor XMC single-width mezzanine card 139mm x 74mm
  • Stack height 10mm XMC to host
  • Host I/F connector P15 XMC (option XMC 2.0)
  • x 8 or x 4 PCI Express® 2.0 (5.0 Gbps)
  • +3.3V only operated (VPWR not in use)

I/O Connectivity
  • PCI Express® External Cabling Specification
  • Two connectors PCIe x 4 38-pos. (front bezel), two target systems can be attached simultaneously
  • Suitable for remote target systems to be controlled by any XMC enabled host system
  • Split-systems, hybrid systems, or system expansion applications
  • Connects to any PCIe based target system with PCI Express® x 4 external cabling adapter
  • Copper cable assemblies 0.5m to 7m length available
  • Active optical cable assemblies (AOC) up to 300m length available
  • PCIe Gen2 x 4 allows for up to 20GT/s bandwidth

On-Board Components
  • Gen2 PCI Express® 16-lanes packet switch on-board
  • Dual clocking option for separation from host system spread spectrum clock (SSC) domain, cable ports can be setup to constant frequency clock (CFC), as required for active optical cables (AOC)
  • Selectable protocol for cable ports PCIe Gen1 or Gen2

Environmental & Regulatory
  • Designed & manufactured in Germany
  • ISO 9001 certified quality management
  • Long term availability
  • Rugged solution
  • Coating, sealing, underfilling on request
  • RoHS compliant
  • Operating temperature: 0°C ... +70°C
  • Industrial temperature range -40°C to +85°C on request
  • Storage temperature: -40°C ... +85°C, max. gradient 5°C/min
  • Humidity 5% ... 95% non condensing
  • Altitude -300m ... +3000m
  • Shock 15g 0.33ms, 6g 6ms
  • Vibration 1g 5-2000Hz
  • MTBF 65.7years
  • EC Regulatory EN55022, EN55024, EN60950-1 (UL60950-1/IEC60950-1)
subject to technical changes

Ordering Information
Please refer to List 22 for popular DC2-STAG SKUs

PCIe External Cabling - Typical Application
PCIe External Cabling - Typical Application

DC2-STAG w. AOC Cable Assembly
DC2-STAG w. AOC Cable Assembly
EKF is an ISO-9001 certified company
EKF Elektronik GmbH • Philipp-Reis-Str. 4 • 59065 Hamm • Germany
Phone +49 (0)2381/6890-0 • Fax +49 (0)2381/6890-90 • E-Mail