ZyXEL Elite 2864I User Guide - Page 209

ing the test. This test can only be initiated while the modem is off-line. If the parallel port DTE interface is used, this test will test the parallel port interface. DTE A Modem Transmitter Receiver ALB B Phone Line A: RS232 Interface B: Line (Jack) Interface Analog Loopback with Self-test (AT&T8) 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 be with the Analog Loopback Test. In the asynchronous mode, the pattern consists of printable ASCII characters. You can see the result on the screen. In the synchronous mode, the pattern is made up of scrambled binary 1 and the Throughput Meter will change to a Bit Error Rate Meter. The left reader displays accumulated bit errors while the right reader displays accumulated bits sent. The Elite 2864 model's TST LED flashes for any bit error and the Omni model's EC LED flashes for any bit error. The Control Level field of the LCD model's LCD screen will be indicated as ALBST, which stands for ALB with self-test. This test can only be initiated when the modem is off-line. The following Bit Error Rate Meter example shows 11120 Kbits sent, 22 bits in error. When the number exceeds 99999 Kbits, it will reset itself back to zero. Modem Transmitter DTE A C B Receiver Phone Line V34 V3228b80140400AALLBBSSTT DDL L H>> H >> 22 22 11112200Kk S S ALBST C: Pattern Generator or Bit Error Tester Local Digital Loopback Test (AT&T3) This test will loopback the digital form data demodulated from the receiver to the input of the transmitter. During testing, all data received from the remote modem will be returned to the remote modem. This test is applicable when the remote modem does not provide V.54 Remote Digital Loopback capability. Also, the Control 18-3