Белая книга для Cisco Cisco 5760 Wireless LAN Controller
Copyright © 2013 Miercom Cisco 3850 and 5760 Wireless Controllers Page 3
level is around 4.3. Because testing of actual VoIP
traffic and listening and evaluating is subjective,
the IxChariot of Ixia Testing Tool is used for
MOS grading.
Without background traffic, both Aruba 7240 and
Without background traffic, both Aruba 7240 and
Cisco WLC 5760 could successfully transmit 10
simultaneous G.711u codec voice calls with
acceptable call quality. Once background traffic is
injected into Aruba 7240, it lost 7.4% of VoIP
traffic. As a result, this caused a reduction in the
Cisco WLC 5760
and Cisco
Catalyst 3850
demonstrated
better packet
forwarding rates
when compared to
Aruba 7240.
Shaded area
shows recorded
values with typical
Internet traffic.
Figure 3: Forwarding Rate (Frames Per Second)
Source: Miercom, May 2013
Figure 4: VoIP QoS Results
Table 1: Ratio of IMIX Frame Size
IP Packet
Size
Frame
Size
Ratio (%)
Small
48
66
57
Medium
576
594
20
Large
1500
1518
12
Random
48 to 1500 66 to 1518
11
MOS score to 1.31 which is unacceptable. When
background traffic was injected into Cisco WLC
5760, 100% of VoIP traffic went through and MOS
remained the same. See
Figure 4
.
Video Quality of Service Testing
QoS was also tested for higher bandwidth
application by transmitting video on the Aruba 7240
and Cisco WLC 5760 and measuring image quality,
in the presence of high volume of background
traffic.
With two client computers accessing the network
With two client computers accessing the network
via wireless access points, a video was played and
screen captured while running a high volume of
background traffic. Screen captures show Quality of
Service in
Figure 5
on
page 4
.
A computer using Aruba 7240 wireless controller
and an AP-135 lightweight access point showed a
distorted video presentation. The client that used
Cisco WLC 5760 wireless controller and a Cisco
3602i lightweight AP had no reduction in video
quality.
Cisco WLC 5760 Wireless Controller demonstrated
better voice quality during the QoS tests which utilized
data and voice traffic. Cisco WLC 5760 achieved toll
quality (based on voice MOS score) for voice calls. The
Aruba 7240 drops packets by 7.4% during these tests
and voice quality suffered.
4.37
4.37
4.28
1.31
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
MOS without
Background Traffic
MOS with
Background Traffic
Vi
deo
Q
ual
ity
by
(M
O
S)
Cisco 5760
Aruba 7240
Toll
Quality
0
5
10
15
20
25
30
35
40
128
256
IMIX
512
1370
1420
Thr
oughput
(M
fps
)
Frame Size (Frames)
Aruba
7240
Cisco
Catalyst
3850
Cisco
Cisco
WLC 5760
Source: Miercom, May 2013
IMIX
IMIX
Traffic