Error Crc’s

Keeping you connected

Keeping you connected


Keeping you connected

CRC Error's what are They?

CRC Cyclic Redundancy check.

A Cyclic Redundancy check (CRC) is an error detecting code commonly used in digital networks and includes storage devices, to detect accidental changers in RAW data. CRC errors play a vital rollin XDSL line stability, causing corrupt or dropped data packets, resulting in dropouts (Loss of sync, LOS) of your service. Which for all end users can be quite and very frustrating, causing the issue to be identified so it can be resolved.  Currently there is no set CRC maximum expectable level, but Telstra and most IPS's around the world find 30 CRC's P/m (Per Minute) to be executable and should not effect any service stability.


Common causes of CRC's?

  • Poor Cable connections
  • Poor cabling routes
  • Corrosion in Sockets
  • Water/moisture in connectors/cable
  • RFI (Radio Frequency Interference) cause by faulty Transformers in L.E.D T.V's monitors etc, 240 Vlts home power circuits, faulty modem ( neighbours)

These are just some of the known causes we find every day when trouble shooting DSL faults looking at the cause of CRC error rates, Just because a POTS (plain ordinary telephone line will pass within specification does not mean the it will be good enough for xDSL services.  The cause of the CRC's need to be identified, located whether within private property or the carriers network, In order to establish this we use specialised equipment and conduct test at the Network Termination Device (NTD) which could be located at the 1st socket or Connect box located at the side3 of the house.  By start here we can quickly establish which side of the network is effected saving the customer time and money.

A lot of todays Technicians fail to fully understand the importance of testing and monitoring CRC error rates for a minimum period of 10 minutes to excluding hidden factors in xDSL testing to exclude hidden factors.