參數(shù)資料
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(yè)數(shù)： 8/28頁(yè)
文件大小： 120K
代理商： CONFERENCEPAPERREPRINT
A ring latency of 84 ms was used to test a small ring.
This corresponds to roughly 7 kilometers of cable. To test
the behavior of the network with larger ring latencies, a
ring latency of 1 ms was selected. This corresponds to
roughly 190 kilometers of cable.
7.3: Target Token Rotation Time
We decided to operate with three values of TTRT- 8
ms, 16 ms, and 24 ms TTRT values less than 8 ms were
not selected because network efficiency drops
significantly [33]. TTRT values larger than 24 ms were
not selected because the packet latencies would be
unacceptable for the multimedia traffic. Additionally, for
a synchronous only network, a TTRT of 26 ms was used.
7.4: Traffic and service models
Of the 50 stations, 26 were set-up to be voice/video
stations, 3 were low-rate imaging sources, 10 were
interactive data terminals, and 10 were file-servers.
Optionally, high burst-rate imaging sources (1 to 7
stations) were used in place of the 3 low-rate imaging
sources. The traffic was thus split into voice/video,
imaging and data. Imaging and data were further sub-
divided. There were two models for the imaging and two
models for the data.
The following table shows the characteristics of the
various traffic models that we selected.
Table 6: Traffic distributions
TRAFFIC TYPE
INTER-
ARRIVAL
TIME (in ms)
0.33
3.6
37
40
16, 84.5
8,14,16,24
-
PACKET
LENGTH
(in bytes)
1
4K + 256
4500
1500 + 256
500
64, 2028 + 20 + 256
1500, 2304, 3000, 4500
-
Peak OFFERED
LOAD
(in Mbps)
2
106.25
10
10
-
0.032, 0.218
1.5, 1.316, 1.5, 1.5
10
Avg. OFFERED
LOAD
(in Mbps)
10
2
3
0.1
0.0112, 0.076
1.5, 1.316, 1.5, 1.5
10
BUFFER
SIZE
(in packets)
3
1000
10
50
10
10, 10
10
50
Imaging host
Imaging workstation
file data
interactive terminal data
voice
4
video
gateway
5
1 The length denotes the data + headers. The headers were deliberately chosen to be a large number.
2 The arrival rate for some traffic had a distribution model rather than a constant rate, which led to peak offered loads and average offered
loads.
3 The buffer size corresponds to the buffering at the transmit and receive queues. If an incoming packet finds the buffer full, it is dropped.
This corresponds to blocking.
4 An interactive voice model (32 Kbps ADPCM), and a MPEG stored voice-stream model were selected for modelling.
5 The gateway loading was approximately equal to 4 voice/video stations and 1.3 fileservers.
Overall, we stressed the network with a variety of traffic
models to ensure that the network is robust under extreme
operating conditions.
7.4.1: Video streams
Each video source represents a compressed video
stream. An MPEG-type stream rate of 1.5 Mbps is used.
This consists of a train of packets ranging from 4500 bytes
to 1500 bytes. The overall video loading is characterized
through a parameter which represents the number of
simultaneously active video sources.
A prescribed fraction of the video stream is directed
through a bridge or a gateway to another FDDI or WAN
network.
The target video latency for a video packet across a
single FDDI is set to be around 15 ms (99% of packets)
and of the order of 10 ms in the average.
7.4.2: Voice streams
Associated with each video stream is a packet voice
stream. This stream was characterized as interactive and
stored (MPEG CD-ROM specifications).
The interactive voice is characterized as a sequence of
32 kbps voice packets, each 64 bytes in size. The voice
source is modeled as a sequence of on-off periods,
representing the talk-spurts and silence periods typical in a
voice conversation. The ratio of talk to silence periods is
35: 65. The resulting offered load of the voice stream is
11.2 kbps.
The stored voice is characterized as a sequence of 2
Kbyte packets (2028 + 20 MPEG headers), with an inter
arrival rate of 84.5 ms. These packets are typically
interleaved with the video stream in a ratio of one voice
every six video packets. On the FDDI, these packets are
repacketized if necessary to smaller packet sizes.
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