User's Manual Part 1

15
the VLAN ID value. Packets with a value of Priority greater than 0 will be given priority over
other packets.
Each unit in the link is manageable through an IP connection. Standard IP protocols are utilised
for all management functions e.g. HTTP, SNMP, etc.
The OS-Gemini is fully software upgradeable. New software images are first download from the
Orthogon Systems website
http://www.orthogonsystems.com to a convenient computer. The
image is then uploaded to the ODU via the web management page described in section 6.3.4
“Software Upgrade”. The compressed image is first loaded into RAM and check-summed. If the
compressed image transfer has completed successfully the image is decompressed and
written to Flash memory. On completion of this process the unit can be rebooted to use the
newly uploaded image. Should this process fail the unit will revert to a protected compressed
image installed during manufacturing to allow the unit to be recovered.