High-reliability CPCI subrack for rear I/O boards
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Schroff UK product story
Edited by the Engineeringtalk editorial team
Feb 15, 2000
Schroff devises new high-reliability CPCI subrack for rear I/O boards For rear I/O CPCI subrack systems, Schroff, Europe's leading manufacturer of electronic enclosures, has developed a new range of r
For rear I/O CPCI subrack systems, Schroff, Europe's leading manufacturer of electronic enclosures, has developed a new range of rear-mount I/O subracks for use in high I/O connection systems.
Commonly used in telecoms and computer telephony applications where hot-swapping is mandatory, these new rear I/O subracks allow for boards to be mounted onto the rear of a CPCI rack system.
This dual arrangement enables active boards to be placed at the front of a CPCI system where they can be accessed easily for hot-swapping, and passive boards, which are less likely to be disturbed, to be situated to the rear of a system with complex wiring and power systems.
Schroff's new rear-mount I/O subrack systems fully comply with the IEEE 1101.11 standard for rear board mounting.
In a CPCI subrack system that supports both front and rear board mounting, the backplane becomes a midplane for both plug-in boards.
To enable electrical connection to the rear plug-in unit, connectors installed into the front of this midplane feature longer pins that protrude the midplane's pcb.
A shroud, placed over these pins on the rear board side, is then used to convert the pins into a male connector for the rear plug-in units to engage to.
To hold the rear board securely, the subrack depth is adapted to fit the rear plug-in units.
This subrack depth is determined by the length of the pins, shroud and rear board.
To ensure the subrack depth is accurate, side panels with a dedicated hole pattern are used to ensure dimensions and tolerances match those of the front-mounted units.
"The distance between the subrack's rear and the inside face of the backplane is a critical dimension (the inspection dimension) which is often overlooked," said Keith Reynolds, Schroff's product marketing manager.
"Omitting this measurement could end with the backplane connector pins not engaging with those on the rear plug-in units- rendering the rear of the system ineffective.
Schroff's rear-mount CPCI I/O solution observes these inspection dimensions." CPCI combines the advantages of proven PC technology with the robustness of 19" systems.
The PCI bus, as used in many offices today, has been coupled with a rugged subrack to produce a low cost, reliable alternative to VME.
Basing CPCI on standard PC technology ensures hardware and software is both well supported competitively priced.
Over the next few years, it is predicted that CPCI will become the de-facto microcomputer packaging systems standard in telecommunications, network and data systems, automation and control, traffic and medical systems around the world.
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