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Title: Computer Network Reliablity
Description: These notes go over some factors about network reliability and performance, Bandwidth, Good-put, Throughput, Availability etc. Including calculations in Availability, Throughput and Utilization.
Description: These notes go over some factors about network reliability and performance, Bandwidth, Good-put, Throughput, Availability etc. Including calculations in Availability, Throughput and Utilization.
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Availability ‐ BTBF/MTTR
03 May 2015
11:36
MTBF ‐ Mean time between failures
MTTR ‐ Mean time to repair
Typical Values:
MTBF ‐ 4000 hours (167 days)
MTTR ‐ 1 hour
Availability =
99
...
4%
Reliability Page 1
Bandwidth, Throughput, Utilisation
03 May 2015
12:28
BANDWIDTH (Hz) ‐ Telecoms
The range of frequencies contained in a signal
...
20Hz = 20bits/s
One bit is transferred every cycle
Hz
Bits/s
THROUGHPUT (bits/s)
The amount of data a network is capable of sending/receiving per second
...
If each frame is 10000
bits, what is the throughput?
/ min
Throughput =
/
1024
/
/
/
/
60
,
,
...
If the BW of
the WAN is 1Gbps, what is the utilisation of the WAN link?
BW = 1Gbps
Data = 4TB = 4096GB = 4194304MB = 33554432MB
Time = 24 Hours = 86400 Seconds
33554432
86400
388
1000
388
38
...
e
...
GOODPUT < THROUGHPUT < BANDWIDTH
Reliability Page 3
Latency (Delay)
03 May 2015
12:29
Latency (delay)
How long it takes an entire message to be delivered from source to destination
...
Access Delay (Queuing Delay)
The amount of time the packet has to wait in the queue while it waits to be transmitted
...
In practise this
can range from microseconds to milliseconds
...
In practise this can be microseconds to milliseconds
...
The speed can range from 2
10 to 3 10 and a total time of milleseconds in a WAN
...
5KB
...
Find the propagation delay and transmission delay; assume propagation speed
is 2
...
12000 1000
2
...
5
8
1
50
1000
10
0
Title: Computer Network Reliablity
Description: These notes go over some factors about network reliability and performance, Bandwidth, Good-put, Throughput, Availability etc. Including calculations in Availability, Throughput and Utilization.
Description: These notes go over some factors about network reliability and performance, Bandwidth, Good-put, Throughput, Availability etc. Including calculations in Availability, Throughput and Utilization.