Technical data

3-2
Extended XR Chassis
3
Dual 9-slot System
The Model XR9209A dual 9-slot system (see Figure 3-1 on page 3-3)
is designed for telecom applications requiring dual, independent 9-
slot VME systems with up to 34GB of disk storage capacity per
system. The Model XR9109A is configured with one 9-slot VME
system, but it may be upgraded to a dual XR9209A configuration.
A Model XR9109A or XR9209A system typically uses a VME drive
module for the initial 3 1/2-inch disk and tape. Additional drives
are added using a SCSI Device Storage Module (see Chapter 4). Up
to four Storage Modules can be added to each system. Each Storage
Module contains up to four half-height drive bays. Two of these
bays can contain removable media devices. Each system can
support up to 18 SCSI drives.
The XR Series offers a -36 to -72 VDC power module for telecom
exchange office applications as well as a 90 to 264 VAC autoranging
power module for industrial and commercial environments. Each
system in a Model XR9109A or XR9209A is configured with its own
power module.
The enclosure contains 10 transition module panels per side for
supporting a variety of connectivity and expansion options, such as
additional Ethernet, SCSI, and communications interfaces.
The XR Series includes a VME module and transition module pair
keying feature which prevents potential module damage caused by
the incorrect insertion of VME or transition modules.