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Hardware Reference 39
C613-03087-00 Rev E
Battery-Backed RAM (AR725, AR745, AR770S
only)
The AR725 and AR745 have 128 kB of battery-backed SRAM as NVS (non-
volatile storage), and the AR770S has 512 kB. The router can store files such as
logs and configuration scripts in NVS over a power cycle.
Onboard Flash Memory
Flash memory is a nonvolatile reprogrammable memory storage device for
router software versions, allowing upgrades to be remotely loaded from any
WAN or LAN port. Flash memory is also used to store other types of data such
as patches, logs and configurations.
There are two types of flash—onboard flash (flash connected directly to the
router’s PCB and available on all routers), and CompactFlash (flash provided
by removable compact flash cards). All the routers have onboard flash
memory; AR725 and AR745 routers also have a slot for compact flash cards.
(“CompactFlash (AR725, AR745 only)” on page 41)
Of the router’s onboard flash memory, 1 MB is reserved for the flash boot
version. You can use the rest to store files in the flash file system, such as a
software version file, GUI resource file, configuration scripts and command
line help file. The router also stores system files in the flash file system.
Testing Onboard Flash Memory
There are several ways to check that onboard flash memory is installed and
operating correctly. First, check that the router has recognised the flash
memory, using the command:
show system
to display system information (Figure 12 on page 38). The second part of the
display shows the types and sizes of memory installed in the router. If the flash
memory size is lower than expected, then the router’s boot process has not
correctly detected or recognised the flash memory’s presence. If recognition
fails, contact your authorised Allied Telesis distributor or reseller.
If the flash is recognised, enter the command:
show flash physical
to display flash memory size, device type and location.