ZyXEL Elite 2864 User Guide - Page 210

Level field of the LCD screen will indicate LDL. The Elite model's TST LED indicator will be ON. This test can be initiated by the local modem when the modems are on-line. Local Modem Remote Modem Transmitter A Receiver B ~~~~ B Transmitter Receiver A DTE LDL Remote Digital Loopback Test (AT&T6) This test will request the remote modem to do a digital loopback. During testing, the local modem will send a remote digital loopback request to the remote modem according to V.54. If the remote modem supports V.54 and is programmed to grant this kind of request, it will resend all of the received data back to the local modem, and the local terminal or computer will receive all of the data it sends out. This test is applicable when the remote modem and local modem both provide V.54 Remote Digital Loopback capability. The Control Level field of the LCD screen of the initiating modem will indicate RLB, and that of the accepting modem will indicate LDL. The Elite 2864 modems will have the TST LED indicator ON during the test. This test can be initiated by either modem when the modems are on-line. DTE Local Modem Transmitter A Receiver RLB B ~~~~ Remote Modem Transmitter B A Receiver LDL Remote Digital Loopback with Self-test (AT&T7) This test generates data from the modem itself instead of input data from the RS-232 interface. The data will go through the same path as it would with the Remote Digital Loopback Test. In asynchronous mode, the pattern consists of printable ASCII characters. You can see the results on the screen. In the synchronous mode, the pattern is made up of scrambled binary 1 and the Throughput Meter of the initiated modem will change to a Bit Error Rate Meter. The left reader displays accumulated bit errors and the right reader displays accumulated bits sent. On the Elite model, the TST LED flashes for any bit error. On the Omni 288 models, the EC LED flashes for any bit error. This test is applicable when the remote and the lo- 18-4