aaaz

What is the difference between CSU/DSU devices? Why do we need to connect to CSU devices before connecting to serial WAN? What is the difference between DTE and DCE cable?

author
chiranjay verma
,
1

I am studying leased line cabling basics. I came across this topic and I am confised about it.

  • Total 1 Answer
  • 2717
Can You answer this question?
author
Mr. Piyush Kataria

DSL and cable modems are CSU/DSUs because they convert from one type of digital signal to another. A CSU/DSU is the equivalent of the modem for an entire LAN.

Lets say your router have a serial port and ISP is providing you a lease line , lease line will be optical fiber where as router is having serial port , so u need a in between device to perform such signal conversion functions.

Recommended

Whoops, looks like something went wrong.

1/1 ErrorException in Filesystem.php line 111: file_put_contents(/var/www/html/storage/framework/sessions/rQPYsJ0ONfR1DjJQpa4syq9pDZ1c0CfBC4nrBqY6): failed to open stream: No space left on device

  1. in Filesystem.php line 111
  2. at HandleExceptions->handleError(2, 'file_put_contents(/var/www/html/storage/framework/sessions/rQPYsJ0ONfR1DjJQpa4syq9pDZ1c0CfBC4nrBqY6): failed to open stream: No space left on device', '/var/www/html/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php', 111, array('path' => '/var/www/html/storage/framework/sessions/rQPYsJ0ONfR1DjJQpa4syq9pDZ1c0CfBC4nrBqY6', 'contents' => 'a:4:{s:6:"_token";s:40:"ioKOOlecXXNWJE4CGIywMqYRbWnXjpI7IEPDiSro";s:11:"viewed_urls";a:1:{i:0;s:167:"what-is-the-difference-between-csudsu-devices-why-do-we-need-to-connect-to-csu-devices-before-connecting-to-serial-wan-what-is-the-difference-between-dte-and-dce-cable";}s:9:"_previous";a:1:{s:3:"url";s:195:"http://www.networkbulls.com/what-is-the-difference-between-csudsu-devices-why-do-we-need-to-connect-to-csu-devices-before-connecting-to-serial-wan-what-is-the-difference-between-dte-and-dce-cable";}s:6:"_flash";a:2:{s:3:"old";a:0:{}s:3:"new";a:0:{}}}', 'lock' => true))
  3. at file_put_contents('/var/www/html/storage/framework/sessions/rQPYsJ0ONfR1DjJQpa4syq9pDZ1c0CfBC4nrBqY6', 'a:4:{s:6:"_token";s:40:"ioKOOlecXXNWJE4CGIywMqYRbWnXjpI7IEPDiSro";s:11:"viewed_urls";a:1:{i:0;s:167:"what-is-the-difference-between-csudsu-devices-why-do-we-need-to-connect-to-csu-devices-before-connecting-to-serial-wan-what-is-the-difference-between-dte-and-dce-cable";}s:9:"_previous";a:1:{s:3:"url";s:195:"http://www.networkbulls.com/what-is-the-difference-between-csudsu-devices-why-do-we-need-to-connect-to-csu-devices-before-connecting-to-serial-wan-what-is-the-difference-between-dte-and-dce-cable";}s:6:"_flash";a:2:{s:3:"old";a:0:{}s:3:"new";a:0:{}}}', 2) in Filesystem.php line 111
  4. at Filesystem->put('/var/www/html/storage/framework/sessions/rQPYsJ0ONfR1DjJQpa4syq9pDZ1c0CfBC4nrBqY6', 'a:4:{s:6:"_token";s:40:"ioKOOlecXXNWJE4CGIywMqYRbWnXjpI7IEPDiSro";s:11:"viewed_urls";a:1:{i:0;s:167:"what-is-the-difference-between-csudsu-devices-why-do-we-need-to-connect-to-csu-devices-before-connecting-to-serial-wan-what-is-the-difference-between-dte-and-dce-cable";}s:9:"_previous";a:1:{s:3:"url";s:195:"http://www.networkbulls.com/what-is-the-difference-between-csudsu-devices-why-do-we-need-to-connect-to-csu-devices-before-connecting-to-serial-wan-what-is-the-difference-between-dte-and-dce-cable";}s:6:"_flash";a:2:{s:3:"old";a:0:{}s:3:"new";a:0:{}}}', true) in FileSessionHandler.php line 83
  5. at FileSessionHandler->write('rQPYsJ0ONfR1DjJQpa4syq9pDZ1c0CfBC4nrBqY6', 'a:4:{s:6:"_token";s:40:"ioKOOlecXXNWJE4CGIywMqYRbWnXjpI7IEPDiSro";s:11:"viewed_urls";a:1:{i:0;s:167:"what-is-the-difference-between-csudsu-devices-why-do-we-need-to-connect-to-csu-devices-before-connecting-to-serial-wan-what-is-the-difference-between-dte-and-dce-cable";}s:9:"_previous";a:1:{s:3:"url";s:195:"http://www.networkbulls.com/what-is-the-difference-between-csudsu-devices-why-do-we-need-to-connect-to-csu-devices-before-connecting-to-serial-wan-what-is-the-difference-between-dte-and-dce-cable";}s:6:"_flash";a:2:{s:3:"old";a:0:{}s:3:"new";a:0:{}}}') in Store.php line 128
  6. at Store->save() in StartSession.php line 88
  7. at StartSession->terminate(object(Request), object(Response)) in Kernel.php line 216
  8. at Kernel->terminateMiddleware(object(Request), object(Response)) in Kernel.php line 187
  9. at Kernel->terminate(object(Request), object(Response)) in index.php line 58
  10. at require_once('/var/www/html/public/index.php') in index.php line 20