We set up a VoIP testing gambit that involved sending 12 simultaneous voice calls across the P2P links--when the links were already at full capacity. All three systems effectively prioritized the voice traffic over the background traffic, confirming that you do benefit if you select a system with the appropriate QoS capabilities.
Different radios supported different QoS types, ToS (type of service) or DSCP (DiffServ)--which define QoS at Layer 3 in an IP packet's header--or 802.1p, which defines QoS at Layer 2 in a three-bit user priority field added to an 802.1Q header. ToS and DSCP packets were tagged at the application layer using Chariot, while 802.1p QoS tagging was defined in our Cisco switches on a per-port basis. We tagged all traffic before it entered the radios.
Alvarion supports ToS or DSCP, while Motorola is limited to 802.1p tagging; its devices can also prioritize TDM traffic over IP traffic. Proxim's MP.11 radio offered the widest array of QoS options, including ToS, DSCP and 802.1p. Oddly enough, though, its high-end Tsunami.GX radios offer no QoS. Proxim says the GX-series devices are meant to act as transparent bridges; traffic would be relayed across the link in a FIFO (first in, first out) manner, with QoS handled by the switch or router connected to the radio. We were surprised at this lack of native prioritization--after all, whenever the input into a device is greater than its ability to transport traffic, QoS is needed, and the GX offers both Ethernet and T1/E1 interfaces. See more on our VoIP results.
Unlicensed And Licensed And Fso, Oh My
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