Technical data

Table 1–1: BA400-Series Module Handles and Cover Types

Part Description

Single-width

blank cover

Covers a standard Q22-bus module that does not have external I/O

connectors (for example, a TQK70).

If you install this type of cover next to a module with a recessed

handle, you must add a metal ﬁller panel to maintain FCC

compliance.

Single-width

ratchet ejector

handle

The CPU module is equipped with ratchet ejector handles to keep

the right amount of tension against the backplane connector. This

ratchet arrangement causes the CPU and memory to make a

tighter contact with the backplane bus and provides better system

reliability.

Single-width

recessed handle

The handle is riveted to the module. This style is the preferred

handle for all BA200-series and BA400-series modules with

external I/O connectors. The CXA16 and CXY08 communication

modules use this type of handle.

Single-width

ﬂush handle

Used when a recessed handle would interfere with the module

circuitry or I/O connector. The ﬂush handle is also riveted to the

module.

Hinged console module

(BA440 only)

with I/O (H3604)

The H3604 console module is a hinged I/O panel that covers the

CPU module and four memory modules.

NOTE: The H3604 console module interfaces with the CPU module through

a short ribbon cable that connects the CPU and the H3604 console module.

1.4 Mass Storage Shelf

The BA430/BA440 enclosure has a mass storage shelf that extends across

the top of the enclosure. See Figure 1–4. The shelf may contain:

• RZ-series ISEs

• RF-series ISEs

• TK-series tape drive

• TLZ04 tape drive

• System Control Panel (SCP)

1–6 BA430/BA440 Enclosure Maintenance