SCHROFF DSC-652TH Card Extender Test Adapter | 0660-01039 810-031325-002

Technical Dossier

Product Details And Specifications

SCHROFF DSC-652TH Series: Comprehensive Module Range and Technical Overview

The SCHROFF DSC-652TH Card Extender and Test Adapter series occupies a well-established position in global heavy-industry automation infrastructure. Deployed across chemical processing plants, nuclear power facilities, petroleum refineries, and large-scale manufacturing lines, these extender cards serve a critical maintenance and diagnostic function: they allow field engineers to operate VMEbus, CompactPCI, and proprietary backplane-mounted modules in an extended, accessible position during live system testing — without removing the card from the active bus. SCHROFF, a brand under the Pentair Technical Products group, has supplied this class of hardware to OEM integrators and end-users across Europe, North America, and Asia-Pacific for several decades. The DSC-652TH designation covers a specific sub-family of extender adapters engineered for high-density card cage environments where thermal management and signal integrity under extended operation are primary constraints.

The Evolution of DSC-652TH Architecture

SCHROFF's card extender product line traces its origins to the early VMEbus standardization era of the 1980s, when IEEE 1014-1987 defined the electrical and mechanical interface that would dominate industrial embedded computing for the following three decades. Early extender cards in this lineage were passive ribbon-cable designs with no active buffering, suitable only for low-frequency diagnostic work. As bus speeds increased through the VME64 and VME64x extensions (ANSI/VITA 1.1, VITA 1.5), SCHROFF introduced active buffering stages into the DSC extender family to preserve signal integrity at clock rates exceeding 40 MHz.

The DSC-652TH generation represents the mature phase of this architecture. It incorporates impedance-matched traces, gold-plated edge connectors rated for a minimum of 500 insertion cycles, and a mechanical frame tolerant of the 3U and 6U card form factors defined by IEC 60297-3. The part numbers 0660-01039 and 810-031325-002 are cross-reference identifiers used respectively in SCHROFF's internal catalog and in OEM procurement systems (notably Siemens and Emerson Network Power integration bills of materials). Compatibility spans VMEbus P1/P2 connector configurations, CompactPCI 32-bit and 64-bit variants, and select proprietary backplane formats used in Siemens SIMATIC, ABB Advant, and Emerson Ovation DCS platforms. As the broader VMEbus ecosystem has transitioned toward VPX (VITA 65) and MicroTCA in new designs, the DSC-652TH series has entered a sustained maintenance and lifecycle-extension phase, with no direct form-fit-function replacement available from SCHROFF's current active catalog.

DSC-652TH Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the SCHROFF DSC-652TH card extender and test adapter family. Each entry reflects a distinct mechanical or electrical configuration. Models are grouped by functional category.

Card Extender / Test Adapter Modules

0660-01039 / 810-031325-002 DSC-652TH: 6U VMEbus card extender, dual P1/P2 connector, active signal buffer, gold-contact edge connector, 500-cycle rated.

DSC-652TH-3U: 3U single-width card extender for CompactPCI 32-bit bus, passive design, suitable for low-frequency diagnostic access.

DSC-652TH-6U-64: 6U extender with VME64x P0 auxiliary connector support, impedance-matched traces, for high-speed bus diagnostics.

DSC-652TH-P: Passive variant of the 652TH, no active buffering, for static board inspection and continuity testing only.

DSC-652TH-A: Active-buffered variant with tri-state bus drivers, supports live bus operation up to 40 MHz clock rate.

DSC-652TH-EXT: Extended-length ribbon cable version, 300 mm extension, for deep card cage access in 14-slot chassis.

DSC-651TH: Predecessor model, 6U VMEbus extender, single P1 connector only, no P2 support, passive design.

DSC-653TH: Successor variant with enhanced EMI shielding on the extender ribbon, for use in high-RF environments (radar, power generation).

DSC-654TH: CompactPCI hot-swap extender, supports PICMG 2.1 hot-swap specification, for live-insertion diagnostic work.

DSC-655TH: VXI (VMEbus eXtensions for Instrumentation) card extender, C-size module, for instrumentation-class test environments.

DSC-660TH: 6U extender with integrated logic analyzer probe points, 32 labeled test points on extender PCB surface.

DSC-661TH: 3U CompactPCI extender with front-panel LED bus activity indicators, for visual bus traffic monitoring during diagnostics.

DSC-670TH: High-temperature rated extender (-40°C to +85°C operating), for use in petrochemical and outdoor substation environments.

DSC-671TH: Conformal-coated variant of the 670TH, IPC-CC-830B Class AR coating, for high-humidity and corrosive atmosphere installations.

DSC-680TH: Universal extender with selectable P1/P2/P0 jumper configuration, covers VME32, VME64, and VME64x in a single hardware SKU.

DSC-690TH: Extender with integrated EEPROM socket for firmware backup and board ID reading during maintenance procedures.

DSC-695TH: Short-form 3U extender, 160 mm depth, for use in shallow-depth card cages where standard extender length exceeds chassis clearance.

Sourcing Hard-to-Find & Obsolete DSC-652TH Parts

The DSC-652TH series is no longer listed in SCHROFF's active production catalog. Lead times from distribution channels for new-old-stock (NOS) units are typically 8–20 weeks, and availability is not guaranteed. DriveKNMS maintains a dedicated inventory of SCHROFF extender and test adapter hardware sourced through authorized surplus channels, OEM decommissioning programs, and controlled factory-excess acquisitions.

For end-users operating legacy DCS or SCADA platforms that depend on VMEbus or CompactPCI infrastructure — including Siemens TELEPERM, ABB Advant OCS, Emerson Ovation, and Foxboro I/A Series — the DSC-652TH extender remains the only field-serviceable tool for in-situ board diagnostics without full system shutdown. DriveKNMS provides lifecycle extension support including: verified NOS stock with original SCHROFF packaging where available; refurbished units with full electrical re-test and connector re-plating; cross-reference matching for OEM part numbers (810-031325-002 and equivalent); and long-term supply agreements for maintenance contractors requiring guaranteed annual allocation.

Quality Control for the DSC-652TH Range

Card extender and test adapter hardware presents a specific failure mode profile distinct from standard I/O or CPU modules. The primary failure mechanisms in the DSC-652TH family are: edge connector wear (gold depletion after repeated insertion cycles), ribbon cable conductor fatigue at the fold point, and active buffer IC degradation from ESD exposure during unprotected handling. DriveKNMS applies the following test protocol to all DSC-652TH units processed through its facility:

Connector inspection is performed under 10x magnification with a calibrated contact resistance measurement (target: <50 mΩ per pin). Ribbon cable continuity is verified with a 4-wire Kelvin measurement across all conductors. Active buffer ICs are tested for correct tri-state behavior and propagation delay within datasheet specification. Full bus loopback test is conducted using a SCHROFF-compatible VMEbus test chassis with a known-good master card. Units passing all stages are issued a DriveKNMS test certificate with individual serial tracking. Units with connector wear exceeding tolerance are re-plated or rejected. No unit is shipped without a completed test record.