ZyXEL Omni 288S User Guide - Page 120

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Chapter 13 - Diagnostics & Troubleshooting 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 SQ LED will flash. 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. 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. This test can be initiated by the local modem when the modems are on-line. 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. 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. This test can be initiated by either modem when the modems are on-line. Remote Digital Loopback with Self-test (AT&T7) This test generates data from the modem itself instead of input data from the RS232 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. This test can be initiated by either modem when the modems are on-line. Indicator Lights Retransmission Indicator In the error control mode, an error occurring in the link will cause the data to be re-transmitted. At the same time, the AA LED will flash. This also indicates the quality of the line. On the LED models the EC LED will flash to indicate retransmission. 13-3

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Chapter 13 - Diagnostics & Troubleshooting
13-3
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 SQ LED
will flash.
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.
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. This test can
be initiated by the local modem when the modems are on-line.
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. 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.
This test can be initiated by either
modem when the modems are on-line.
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. This
test can be initiated by either modem when the modems are on-line.
Indicator Lights
Retransmission Indicator
In the error control mode, an error occurring in the link will cause the data to be
re-transmitted. At the same time, the AA LED will flash. This also indicates the
quality of the line. On the LED models the EC LED will flash to indicate
retransmission.