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BIT Error Rate (V.52) Diagnostics 144
Model 3086FR ATM IAD User Guide 13 • Diagnostics
BIT Error Rate (V.52) Diagnostics
The Model 3086FR offers a V.52 Bit Error Rate (BER) 511 test pattern. This test pattern may be invoked
along with the LAL and RDL tests to evaluate the unit(s) and the DSL communication links. When a 511 test
is invoked, the 3086FR generates a pseudo-random pattern of 511 bits using a mathematical polynomial. The
receiving Model 3086FR then decodes the received bits using the same polynomial.
If the received bits match the agreed upon pseudo-random pattern, then the 3086FR(s) and the communica-
tion link(s) are functioning properly. 511 Initiates a built-in 511 bit pseudo-random pattern generator and
detector. 511 with Errors Initiates a built-in 511 bit pseudo-random pattern generator and detector. The test
pattern generator also injects intentional errors approximately once per second, causing the Error LED to
blink.
To perform a V.52 BER test, follow these steps:
1. Locate the toggle switch group on the right side on the front panel and place it in the middle where it is
marked “Normal”. This activates the V.52 transmission and reception of the selected test pattern. If there
are errors in the received pattern, the error LED will blink accordingly.
2. If the above test indicates no errors are present, move the toggle switch UP to 511/E, activating the BER
test with intentional errors. If the test light is working properly, the local modem’s red error LED will blink
approximately once per second.
Note
The above V.52 BER tests can be used independently of the Remote Digital
Loopback tests.