ADTRAN D4 U-BR1TE V warranty Loopback Tests ADR1 ADR6, NT1, Point-to-Point Test CRTX, Lptx

The front panel bantam jacks accommodate standard DS0 Logic Testers such as the TPI 108/109 RT II or FIREBERD 4000/6000 which perform both the upstream and downstream testing.

NOTE

On DDS circuits the internal 2047 Pattern Generator on the U-BR1TE V should be used only when the service is operating at 64 kbps. If DDS service is operating at 56 kbps or less, the U-BR1TE V will display errors if the internal 2047 Pattern Generator is used. The use of external DDS test equipment is required for all data rates at 56 kbps and below.

Loopback Tests (ADR1 - ADR6, NT1)

Loopbacks in the Network-to-Customer direction can be initiated from either the ISDN switch or the front panel. Either the internal 2047 test pattern or a DS0 digital test set provide the 64 kbps test pattern to be tested in B1 or B2. When initiating loopbacks from the U-BR1TE V front panel, the downstream direction is automatically selected based on the card position in the network.

To initiate a loopback using the internal 2047 test pattern, perform the following:

1.Select the desired loopback address using the ten- position rotary switch. See Table 2.

2.Select the desired bearer channel using the B1/B2 DIP switch.

3.Select PTRN on the NORM/PTRN DIP switch.

4.Depress the recessed TEST pushbutton to initiate the test. The TEST LED will illuminate GREEN when the loopback is established to the selected address, and the ERR LED should go out following synchronization to the test pattern. If the selected address does not respond, the TEST LED will remain out and the ERR LED will illuminate.

5.To insert one bit error, momentarily (for less than two seconds) depress the TEST pushbutton. The ERR LED should flash upon receipt of the injected error.

6.Tests to additional network addresses may be performed by changing the selector knob to the desired address. It is not necessary to exit the test mode to select a new address.

7.To deactivate the loopback, depress the TEST pushbutton for two seconds, until the GREEN TEST LED is extinguished, or select NORM on the NORM/PTRN DIP switch.

To initiate a loopback at any data rate when using an external DS0 digital test set, perform the following:

1.Insert the TX and RX bantam plug of the DS0 digital test set into the U-BR1TE V respective front panel bantam jacks. Connect the clock input of the DS0 digital test set to the channel bank’s clock source (the D4 OIU, or the SLC-96 SSU). Configure the test set for Near Logic and 64 kbps.

2.Select the desired loopback address using the ten- position rotary switch. See Table 2.

3.Select the desired bearer channel using the B1/B2 DIP switch.

4.Depress the recessed TEST pushbutton to initiate the test. The TEST LED will illuminate YELLOW when the loopback is established to the selected address. If the selected address does not respond, the TEST LED will remain off. Observe the DS0 digital test set for bit errors.

5.Tests to additional network addresses may be performed by changing the selector knob to the desired address. It is not necessary to exit the test mode to select a new address.

6.To deactivate the loopback, depress the TEST pushbutton or remove the transmit bantam plug. Upon deactivation of the test, the TEST LED will go out.

Point-to-Point Test (CRTX, LPTX)

Apoint-to-point (straight-away) test can be performed to either the U-interface (LPTX) or the T-1 carrier interface (CRTX). In both cases, either the internal 2047 test pattern generator or a DS0 DP digital test set is used to verify the performance of the selected bearer channel.

To initiate a point-to-point test using the internal 2047 test pattern, perform the following:

1.Select the desired test direction, LPTX or CRTX, using the ten-position rotary switch. See Table 2.

2.Select the desired bearer channel using the B1/B2 DIP switch.

3.Select PTRN on the NORM/PTRN DIP switch.

8 Section 61104020L4-5, Issue 3 61104020L4-5C