Telco circuit patterns tests and results

When you are testing WAN links, applying different patterns would be good idea to isolate an issue. Here is output of each testing pattern.

0x0000 – Sending binary all 0’s (zeroes) to see a failure if the line is mis-coded

0xFFFF – Sending binary all 1’s (ones) to see a failure if the line is mis-coded. All 1’s also tests for bad equipment. The repetative 1’s signal stresses out equipment. This is a good indicator of equipment which is starting to go bad, due to the fact that it cannot keep the heavy ‘1’ signal.

0x5555 – Sending binary alternating 1’s and 0’s to see a failure on bad repeater

0x8080 – Sending patterns 3-in-24 to see a failure on bad repeater, this is ‘1 in 8’

0x1000 – To see a failure on bad MUX/DACS