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| 型號(hào)： | CONFERENCEPAPERREPRINT |
| 英文描述： | Conference Paper Reprint - Multimedia over FDDI (Paper) |
| 中文描述： | 會(huì)議文件再版-在FDDI（多媒體文件） |
| 文件頁數(shù)： | 10/28頁 |
| 文件大?。?/td> | 120K |
| 代理商： | CONFERENCEPAPERREPRINT |
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as file service and interactive terminal traffic were not
capable of exceeding the network capacity and hence the
network could always clear the buffers faster than the
application could fill them.
The percentage of traffic blocked due to overflow
decreased slightly with increasing TTRT. This is again
intuitive because the larger TTRT values allowed longer
transmission times which in turn allowed the buffers to be
drained more often.
8.1.5: Effect on gateway
For traffic from FDDI to other LANs or WANs, the
latency was gated by the characteristics of the other LAN
or WAN. So long as the outbound traffic was less than the
capacity of the WAN or LAN, there was little or no
queuing delay. The major component of the delay was
then the transmission delay.
The effect of the changing of the various network
parameters on the gateway (figures 4-18) was similar to
that of other end-stations except that in the overload case
the gateway suffered significant blocking. The gateway
was the bottleneck for voice/video sessions spanning the
LAN-WAN-LAN connection. The minimum latencies
observed when the network loading was 90% and with at
least one high burst-rate source on the network, was 24 ms
at 8 ms TTRT.
When the high burst-rate source (imaging with peak
offered load of 100 Mbps and average of 10 Mbps) was
removed, the gateway provided acceptable performances
with latencies less than 15 ms.
8.2: Case 2- Asynchronous plus synchronous
network
In this network the voice and video are transmitted
over the synchronous channel. The synchronous
bandwidth is allocated per station based on the application
requirement. The voice and video packet sizes are varied
according to the TTRT requirements. If 64 byte
interactive voice packets are used, then the packet size is
constant for the different TTRT. For video, the packet-
size is 1500 bytes for 8 ms, 3000 bytes for 16 ms and 4500
bytes for 24 ms TTRT. The gateway is used for
voice/video and file server data forwarding. The gateway
is allocated synchronous bandwidth in proportion to the
traffic leaving the LAN. If four video streams are leaving
the LAN, then the gateway is allocated bandwidth equal to
four video streams (e.g. at 0.75 ms per video stream the
gateway is allocated 3 ms).
8.2.1: Effect on 99% latencies
We observe that the 99% latencies for voice/video
streams is fairly constant and under all circumstances-
90% and 150% loading on a small ring, 90% and 150%
loading on a large ring, and different TTRT - the 99%
latencies are within 24 ms. For 8 ms and 16 ms TTRT
values, the latencies are always within 16 ms. Even under
extreme stress, the synchronous channel offered a low-
latency path for time-critical applications such as
multimedia.
8.2.2: Effect of TTRT on latencies
Within the range of TTRT values yielding acceptable
latencies, it was more difficult to isolate the better TTRT.
We observed that while 8 ms TTRT yields excellent
values for voice/video traffic, the asynchronous bursty
traffic suffered lower latencies at the higher TTRT values.
Considering all traffic streams, we observed that a 16 ms
TTRT offered better all-round latencies in a mixed
synchronous and asynchronous network (figure 5, 7, 9 and
11).
8.2.3: Effect of ring sizes
To observe the effect of ring sizes on the network
performance, we simulated with a small ring size of 84 ms
latency and a large ring size of 1000 us latency. The
effect of increased ring sizes on voice / video (VV) is
readily apparent on the mean delays. The mean latencies
increased by as much as 40% whereas the 99% latencies
increased by about 10-15% only. Since the important
parameter for system design is the 99% latency rather than
the mean latency, this implies that in the range of typical
ring sizes (50 ms to 400 ms ), the 99% latencies are fairly
constant.
8.2.4: Effect of buffer sizes
The effect of buffer sizes is slightly higher blocking
than in the asynchronous only network. This is due to the
synchronous traffic effectively blocking some portion of
the bandwidth. If 20% of the bandwidth is allocated to the
synchronous channel, then for the asynchronous
applications FDDI appears to be a 80 Mbps asynchronous
data pipe. This is an excellent result because it implies
that if the asynchronous application capacity requirement
is known, the rest of the FDDI bandwidth can be allocated
to the synchronous channel and there will be little or no
effect on the asynchronous applications.
8.2.5: Effect on gateway
For traffic from FDDI to other LANs or WANs, the
latency was gated by the characteristics of the other LAN
or WAN. The major component of the delay was then the
transmission delay.
The effect of the changing of the various network
parameters was similar to that of other end-stations
(figures 5, 7, 9,11, 13, 15, 17). It was observed that for
the incoming traffic from the gateway, the latencies were
less than 16 ms for TTRT values of 8 and 16 ms, under
overload. For 24 ms TTRT the delay was of the order of
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