Filter
Top Products
9 • Diagnostics Model 3086 G.SHDSL Integrated Access Device User Guide
140 T1/E1 Diagnostics
1. Go to the 3086 Main page, select E1/T1. Next, click on Test Modes, select local Loop using the drop down
menu, click on the
Activate Test Mode
button.
2. Perform a BER (bit error rate) test. This test can be initiated from the far end using a T1/E1 BER tester to
verify the T1/E1 path over the DSL line and 3086s involved.
QRSS—BIT Error Rate Diagnostics
The 3086/K offers a Bit Error Rate (BER) QRSS test pattern. This test pattern may to be used to test the com-
munication link and the T1/E1 interface of the device attached to the 3086. When a QRSS test is invoked, the
3086 generates a pseudo-random pattern using a mathematical polynomial. The pattern is sent over the T1/E1
interface to the far end device and looped to the 3086 (originator), the far end device i.e. PBX or routers’s T1/
E1 port must be set to line loop. The local 3086 decodes the received bits using the same polynomial. If the
received bits match the agreed upon pseudo-random pattern, then the 3086 and the communication link are
functioning properly. The 3086 can also initiate a built-in QRSS pattern with errors. This test pattern genera
-
tor injects intentional errors approximately once per second in the transmitted stream.
To perform a BER test, follow these steps:
1. From the Main page T1/E1 option, select the QRSS or QRSS Errs option, and then click on the Activate
Test Mode button. This will start the internal test pattern generator for data sent and looped at the far end
device.
2. Monitor the BER test results. The Test Mode Status window will display the number of bit errors, if any,
detected in the received stream.
Note
The above BER tests will not work if the 3086’s T1/E1 interface has
been placed in Network loop.