Search Results for '2009/11'


5 POSTS

  1. 2009/11/25 ezTCP Throughput (3) by Roy
  2. 2009/11/23 ezTCP Throughput (2) by Roy
  3. 2009/11/12 ezTCP Throughput (1) by Roy
  4. 2009/11/12 Comparison of EZL-200L, CSE-H25 and CSE-H53 by Roy
  5. 2009/11/05 Making Ethernet Cables by Roy
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ezTCP Throughput (3)

In the third time of throughput test, ARM7 core units with MIC real time operating system (RTOS) and EZL-410 are used. MIC RTOS was developed by Sollae Systems. The names of used products are EZL-200F, EZL-410, EZL-400S. These products support 10/100 M bit Ethernet.

This test is also implemented under the same conditions with the previous tests.

* Parameters
 - Baud Rate[bps]
 - File Size: The size of a file which is sent
 - Bytes: Byte counts of the file
 - Time[sec]: Amount of time which is taken
 - Throughput[bps]: Estimated throughput = (Bytes * 11) / Time
    >> 11 bit ( 1 start bit + 2 stop bit + 8 data bit + No parity)
 - Performance[%] = (Throughput) / (Baud Rate) * 100

* Results
 - EZL-200F

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 - EZL-410
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 - EZL-400S
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 - Opinion

These products showed excellent performances. One of the reasons is that these three products have kind of big buffers like EZL-50M.

 

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Posted by Roy

2009/11/25 10:10 2009/11/25 10:10
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ezTCP Throughput (2)

In the second time of throughput test, 1 port Atmel AVR units are used. Those are EZL-50L, EZL-50M, EZL-70 and EZL-200L. These products support 10 Base-T Ethernet (10M bps) only, but those are popular products until now.

This test is also implemented under the same conditions with the previous test.

* Parameters
 - Baud Rate[bps]
 - File Size: The size of a file which is sent
 - Bytes: Byte counts of the file
 - Time[sec]: Amount of time which is taken
 - Throughput[bps]: Estimated throughput = (Bytes * 10) / Time
 - Performance[%] = (Throughput) / (Baud Rate) * 100

* Results
 - EZL-50L

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 - EZL-70
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 - EZL-200L
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 - EZL-50M
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 - Opinion

Except for EZL-50M, performances of above products were not satisfied in compared with previous ARM7 Core products. However, in high speed data communication, you can use the [Disable TCP Transmission Delay] option. If you use it, ezTCP sends serial data to the Ethernet right after the data have arrived. The second graph of the EZL-200L (Performance 2) shows the result. (Actually, performances of EZL-50L and EZL-70 were the same with performance 2 of EZL-200L by using the option.)
The performance of EZL-50M was better than other products because it has pretty big buffer.

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Posted by Roy

2009/11/23 01:38 2009/11/23 01:38
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ezTCP Throughput (1)

In the first time of throughput test, 2 ports ARM7 core units are used. Those are CSE-M32, H20 and H21.

* What is the "Throughput" in data communication?
>> "Throughput"  is the average rate of successful message delivery over a communication channel.

* What can be inffered from the "Throughput"
>> Throughput can be a factor that can estimate performance of communication devices.

* Test environment
 - Diagram
  [PC] >>> (Ethernet) >>> [HUB] >>> (Ethernet) >>> [ezTCP] >>> (RS232) >>> |
                                                                                                                     |  Loop back
  [PC]<<< (Ethernet) <<< [HUB] <<< (Ethernet) <<< [ezTCP] <<< (RS232) <<<  |
 - Using RTS/CTS flow control (No data loss)

* Parameters
 - Baud Rate (bit per second)
 - File Size: The size of a file which is sent
 - Bytes: Byte counts of the file
 - Time: Amount of time which is taken
 - Throughput: Estimated throughput = (Bytes * 10) / Time
 - Performance = (Throughput) / (Baud Rate) * 100

* Results
 - CSE-M32

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- CSE-H20

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- CSE-H21
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* Opinion

 These products showed such nice performances.
In the high baud rate, the "Disable TCP Transmission Delay" option will help the performance of CSE-M32 to be much better.



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Posted by Roy

2009/11/12 10:44 2009/11/12 10:44
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Comparison of EZL-200L, CSE-H25 and CSE-H53

Today, I want to comare three of our products.
Each of this product is a serial device server which has one RS232 port.
Item EZL-200L CSE-H25 CSE-H53
Picture

Size 136 by 83 by 29 87 by 57 by 24 87 by 57 by 24
Ethernet 10Base-T 10/100Base-T 10/100Base-T
Security IP filtering,
MAC filtering,
Password

IP filtering,
MAC filtering,
Password,
SSL, SSH

 IP filtering,
MAC filtering,
Password
Temperature 0℃~55℃ -40℃~85℃ -40℃~85℃
DNS Not supported Supported Supported
DDNS Not supported Supported Supported
TCP Server/Client
Mode		 Not supported Supported Supported

TELCOM
(RFC2217)

 Not supported Supported Supported
Multi-Monitoring Not supported Supported(3ch) Not supported
Baud rate up to 115200bps up to 230400bps up to 230400bps

CSE-H53 has not been introduced yet.
This product is a extanded type of CSE-M53 model.
It will be introduced in the market soon.
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Posted by Roy

2009/11/12 08:11 2009/11/12 08:11
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Making Ethernet Cables

When making Ethernet cables, you should use the UTP cable.
To make the cables, follow tools are requred.
The tools are for taking the skin of the UTP cables off and pressing the connecter.

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Most people which studied engineering may know this process of making Ethernet cables.
It doesn't hart to make and you can easily find it on the Internet.

There are some key points.

Ethernet cables has two types.
We call them direct and crossover cable.
Those can be recognized by their color of each wire.

[How to make direct cable]
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The 8 wires should have the same order.
That means both connecter has to be the same form.
Make sure the order of colors are correct.
(Orange with stripes - Orange - Green with stripes - Blue - Blue with stripes - Green - Brown with stripes - Brown)
This type is used when connecting a terminal with network Hub, because the Ethernet port of network Hub has different form with normal terminal like PC.

[How to make crossover cable]

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Two differences are needed on both connecters compared with the direct type.
One of connecters has the same order of color
(Orange with stripes - Orange - Green with stripes - Blue - Blue with stripes - Green - Brown with stripes - Brown)
The other connecters has to be changed 2 pair of wires.
The first wire has to be replaced with third wire.
And the second wire has to be changed with sixth wire.
(Green with stripes - Green - Orange with stripes - Blue - Blue with stripes - Orange - Brown with stripes - Brown)
This type is used when connecting the same kinds of devices. (ex. PC-PC, Hub-Hub)

Recently, most of network devices has a function of auto-detecting the types of cable. So, you may not need this information in the future.

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Posted by Roy

2009/11/05 10:30 2009/11/05 10:30
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