General Information

Function

The Rack Expander acts as a repeater for data signals from a primary Quantum rack. Since power is not provided to the secondary rack over the expander cable, power supplies are required in both racks.

The Rack Expander does not have any LEDs to display its status. The active LEDs of the modules in the secondary rack and their associated diagnostic status bits indicate proper operation, including the Rack Expander.

Basic Configuration

The rack containing the CPU or RIO drop adapter is called the Primary rack, and the adjacent rack is designated as the Secondary rack. Each rack requires its own power supply.

Power Supplies

CPU or RIO Adapter

First Rack Expander (140 XBE 100 00)

Second Rack Expander (140 XBE 100 00)

Rack Expander Cable (140 XCA 717 0•)

Cable end marked as "Primary"

NOTE: Install the cable when the racks are powered OFF.

CAUTION

UNINTENDED EQUIPMENT OPERATION

The communication cable is polarized. The cable end marked "Primary" must be connected to the rack that includes the CPU or RIO adapter.
The communications cable must be connected to the Rack Expander module before it is hot swapped into a powered rack.
Do not hot swap Rack Expanders modules while modules in secondary rack are operating.

Failure to follow these instructions can result in injury or equipment damage.

Features

Enhances system performance requiring fewer remote I/O drops for the CPU to service.
Enables a Quantum CPU to handle up to 27,648 discrete I/O.
Makes it easy to plan for future I/O expansion by leaving an I/O slot empty for module insertion.
Cost effective for local I/O by eliminating the need for a remote I/O head and drop.
Cost effective by eliminating the need for an additional remote I/O drop.

Part Numbers

The following table provides necessary part numbers.

Rack Expander	140 XBE 100 00
Rack Expander (conformally coated)	140 XBE 100 00C
Expander Cable, 3' (1 m)	140 XCA 717 03
Expander Cable, 6' (2 m)	140 XCA 717 06
Expander Cable, 9' (3 m)	140 XCA 717 09