Maintenance Manual

ToS configuration represents a tradeoff between precedence, delay, throughput, and reliability. Ensure that you

maintain a balance when prioritizing packets, so that other packets on the network are not subject to undue delay (so

for example, do not set every value to 1).

DiffServ Configuration

DiffServ uses six out of a possible eight bits to set a codepoint. There are 64 possible codepoints. The MCU allows

you to set bits 0 to 5, and places zeros for bits 6 and 7. The codepoint is interpreted by DiffServ nodes to determine

how the packet is treated.

Default Values

These are the default QoS settings on the MCU:

■ Audio 101110

— For ToS, this means IP precedence is set to 5 giving relatively high priority. Delay is set to low, throughput is

set to high, and reliability is set to normal.

— For DiffServ, this means expedited forwarding.

■ Video 100010

— For ToS, this means IP precedence is set to 4 giving quite high priority (but not as high as the audio

precedence). Delay is set to normal, throughput is set to high, and reliability is set to normal.

— For DiffServ, this means assured forwarding (codepoint 41).

■ Streaming 000000

■ Signaling 000000

■ Admin 000000

To revert to default values, click Reset to default.

Changes to QoS settings require a reboot to take effect.

More Information

For more information about QoS, including ToS and DiffServ values, see the relevant RFCs on the Internet Engineering

Task Force web site www.ietf.org:

■ RFC 791

■ RFC 2474

■ RFC 2597

■ RFC 3246