User's Manual

14
12. Quality of Service (QoS)
For the transport of real-time data, such as VoIP or streaming video, a QoS
system provides end-to-end prioritization of pre-tagged Ethernet frames.
The QoS system relies upon the originating network device/appliance to tag
frames using an 802.1p VLAN priority tag.
As a frame enters the Radio, a tag inspection is performed and frames are
prioritized as follows:
a. A priority queuing method assigns tagged frames to one of the 4 priority
queues, allowing higher priority data to then be pushed onto the RF stack
ahead of lower priority frames. Tagged frames are assigned to queues
based on the following tag matrix:
Voice Video Normal Background
Tag Method
802.1p 0x3 0x2 0x0 0x1
0x7 0x6 0x4 0x5
b. Once on the RF stack, the RF MAC gives prioritized frames early access to
the ‘air’ resulting in the frames being delivered sooner to the receiving
radio.
Notes:
• The QoS system does not add or alter priority tags
• QoS is always ‘enabled.’
• For best results, all network devices (switches, routers, gateways)
between source and destination devices should be QoS aware.
13. VLAN Access
Units will bridge VLAN frames transparently at all times. That is, all frames
tagged with VLAN IDs will be recognized and passed though the system. The
unit will NOT tag or strip VLAN ID’s.
A VLAN configuration section is available under Configuration -> Advanced
which affects the accessibility of the Radio’s user interface by Management
computers from within a VLAN.
Enable/Disable. If access to the Web GUI will be from a PC within a VLAN,
then this feature should be Enabled. If access is from a PC outside of a VLAN,
then this feature should be disabled.
VLAN ID: The ID should be set to match the VLAN ID used on your
management PC. This setting does not affect any other VLANs running on your
network or the ability to pass VLAN traffic.
Warning: Enabling Management Access via VLAN will lock-out HTTP and
Telnet access if attempting to connect from a PC without the proper VLAN
configuration.