Breakout Box


The Model 800 (HSSI) High Speed Serial Interface (SCSI-2) Breakout Box is lightweight, pocket-sized tool designed for use to monitor all signals of the SCSI-2 interface. SCSI is a hardware interface that allows for the connection of up to 15 peripheral devices to a single PCI board called a SCSI host adapter.  SCSI uses a bus structure and functions like a mini-LAN connecting 16 devices, with the host adapter counting as one device.

 The Model 800 is simply inserted in series between SCSI interface devices to provide access to and monitoring of all data, timing, and control signals.   There are fifty numbered test points on the unit and they are connected directly to the 50 pins of both HSSI/SCSI-2 connectors.  The test points serve as access points for signals that are being passed between connected devices.  HSSI (High Speed Serial Interface) is a short distance communications interface that is commonly used to interconnect routing and switching devices on local area networks with the higher speed lines of wide area networks.

The Model 800’s input/output connectors are female 50-pin SCSI-2 (Mini-50) featuring test points for all 50 connector pins and ample supply of mini-patchcords.  The 15 one-foot mini patchcords provided with the Model 800, plug into test points on the box and facilitate access to signals passing through between connected devices.  These mini patchcords allow easy access to the corresponding connector pint, which in turn can be connected to a scope, probe, data analyzer, voltage meter, or other diagnostic instrument.

The Model 800 is built to last with a rugged aluminum case with sturdy metal hinge and latch yet lightweight and pocket sized with dimensions of 4.0”x 5.25”x1.75” (10.2 x 13.3 x 4.4cm).


  • pocket-sized tool
  • monitor all signals of the SCSI-2 interface
  • uses a bus structure
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