Bandwidth VS Speed

I have not updated this blog for long time, due to busy and enjoy with new role on my daily job. My current role is Sales Engineer or some of people say Solution Architect. This is very different with my previous role in mostly as Project and Support Engineer with daily activity hands-on devices. Sales Engineer is combine technical perspective and soft skill to communicate product and solution to customer.

Lets back to main topic 'Bandwidth VS Speed'.

Some of people understand bandwidth and speed is same but for actual both is very different meaning. Bandwidth is how much or how many or how wide the way go to destination or to reach destination or to get something from destination, the unit on internet network world is bit or byte. We can say bandwidth is capacity of the way go to destination. Speed is how fast the source go to destination or to get something from destination, the unit on internet network world is bit/s ( bit per second ) or byte/s ( byte per second ) Even bandwidth and speed is different meaning but the both is related, lets look below tested.

# Server (receiver):

$ iperf -u -s
------------------------------------------------------------
Server listening on UDP port 5001
Receiving 1470 byte datagrams
UDP buffer size:   107 KByte (default)
------------------------------------------------------------
[  3] local 10.0.1.5 port 5001 
connected with 10.0.1.10 port 65299
[  3]  0.0-10.0 sec  1.25 MBytes  1.05 Mbits/sec  0.008 ms    
0/893 (0%)

# Client (sender):
# Please look at below with bold text ( sentence is confusing ), Bandwidth value use Mbits/sec

$ iperf -u -c 10.0.1.5 -b 1M
------------------------------------------------------------
Client connecting to 10.0.1.5, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 9.00 KByte (default)
------------------------------------------------------------
[  3] local 10.0.1.10 port 65300 
connected with 10.0.1.5 port 5001
[ ID] Interval      Transfer     Bandwidth
[  3]  0.0-10.0 sec 1.25 MBytes  1.05 Mbits/sec
[  3] Server Report:
[  3]  0.0-10.0 sec  1.25 MBytes  1.05 Mbits/sec  0.003 ms 
0/893 (0%)
[  3] Sent 893 datagrams