Acer ISDN 128 Surf USB Bedienungsanleitung Seite 11

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5.3.1 The fidelity of Measuring
The fidelity of measuring depend on synchronization of time between sides of measuring
[12]. The CRUDE/RUDE can use synchronization of time from:
Autonmous celsium clock on all sides (very expensive)
GPS receiver (available)
LAN (simpler but less fidelity)
We will use the simplest and cheap solution of LAN synchronization via The Network Time
Protocol.
5.4 Solution of QoS test
In QoS test i used a network equipment available in Lab of Signal processing on faculty of
electrical engineering in Zagreb. In Test i used:
WiFi 802.11b D-link 900+ Access point
WiFi 802.11b D-link 122 USB network adapter
Swich HP Procurve 2626 1G/100 with supported Qos,CoS
Two PCs with linux OS system
UTP Cat-5 patch cables
On the figure 5 you can see the order of lab network for test QoS parameters needy for time
depend services.
Fig. 5 - Elementary laboratory (bridged) network for test QoS parameters
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