Abaco Systems / SBS / Bit 3 418-101 VME Bus Repeater Module

The Abaco Systems / SBS / Bit 3 418-101 VME Bus Repeater Module extends VMEbus backplane connectivity from a primary chassis to a secondary chassis, enabling unified system control and expansion of embedded computing architectures. The module creates a single logical system where the primary chassis operates independently while the secondary chassis depends on the primary for operation. By handling bus requests, grants, and interrupts between chassis, the Repeater maintains glitch-free operation on the primary during secondary power cycling—eliminating VMEbus timing errors that would otherwise occur.

– Technical Specifications

• Bus Support: VME-32 and VME-64 (VME64 Revision D1.4)
• Data Transfer Sizes: D8 (E0), D16, D32, D64
• Address Sizes: A16, A24, A32, A64
• Transfer Types: BLT, RMW, UAT
• Release Modes: ROAK, ROR, RORA, RWD
• Arbiters: SGL, PRI, RRS
• Card Form Factor: 6U VMEbus
• Power Consumption: 2.75 A at 5 V
• Operating Temperature: 0°C to 60°C
• Storage Temperature: -40°C to 85°C
• Humidity: 0% to 90% non-condensing

– Key Features

• Optional software-controlled enable/disable via I/O register write
• Jumper-selectable bypass mode eliminates I/O address overhead
• Two round EMI-shielded copper interconnect cables with Subminiature D connectors
• Standard cable lengths: 8 feet (Model 400-135) and 25 feet (Model 400-136)
• Cables purchased separately from Repeater module
• Transparent operation to VMEbus systems when configured

– System Architecture

The 418-101 represents one configuration within the 418 series product line. Model 418 includes two 6U Repeater cards; Model 418-50 includes one 6U card and one card in a 6U/9U metal holder. Both chassis operate as an integrated unit under primary chassis system controller authority, providing flexible scaling for multi-chassis VMEbus deployments.