ZyXEL Omni TA 128 User Guide - Page 117

ISDN Loopback test AT&T9, Loopback with Self-test AT&T10, B1/B2 Loopback with Self-test AT&

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ISDN Loopback test (AT&T9) The AT&T9 command will invoke an ISDN loopback test connection. The loopback point is in the S/T interface chip (Siemens 2086 chip) or the U interface chip (Siemens 2091 chip) just behind the line transformers, thus it checks almost every part of the ISDN TA and RS-232 cable except the passive front-end of the ISDN S/T or U interface. During this test, data from the terminal or computer is sent through the DTE interface to the ISDN TA's transmitter and is packetized to the proper frame format according to the B channel protocol selected and then loop-backed to the receiver, de-packetized, and sent through the DTE interface back to the terminal or computer's screen. The screen should show the data you have sent to the ISDN TA. Loopback with Self-test (AT&T10) The AT&T10 command will invoke an ISDN loopback connection with self-test. The data is generated by the ISDN TA and will go through the same path as the above Loopback Test does. The data pattern is printable ASCII characters. You can see the result on the screen. The loop backed data is compared with the transmitted data. Should an error occur, the LNK LED will start to flash. Sending any character through the DTE interface to the ISDN TA will discontinue the test. B1/B2 Loopback with Self-test (AT&T11) There is an AT command designed for testing the readiness of your ISDN line which uses one B-channel (B1) to place a call and the other B-channel (B2) to receive the call. Follow these instructions to make your test call: Type: AT&ZOI=your_isdn_number TA128 responds: 105

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105
ISDN Loopback test (AT&T9)
The AT&T9 command will invoke an ISDN loopback test
connection. The loopback point is in the S/T interface chip
(Siemens 2086 chip) or the U interface chip (Siemens 2091 chip)
just behind the line transformers, thus it checks almost every part
of the ISDN TA and RS-232 cable except the passive front-end of
the ISDN S/T or U interface.
During this test, data from the terminal or computer is sent through
the DTE interface to the ISDN TA's transmitter and is packetized to
the proper frame format according to the B channel protocol
selected and then loop-backed to the receiver, de-packetized, and
sent through the DTE interface back to the terminal or computer's
screen. The screen should show the data you have sent to the ISDN
TA.
Loopback with Self-test (AT&T10)
The AT&T10 command will invoke an ISDN loopback connection
with self-test. The data is generated by the ISDN TA and will go
through the same path as the above Loopback Test does. The data
pattern is printable ASCII characters. You can see the result on the
screen. The loop backed data is compared with the transmitted
data. Should an error occur, the LNK LED will start to flash.
Sending any character through the DTE interface to the ISDN TA
will discontinue the test.
B1/B2 Loopback with Self-test (AT&T11)
There is an AT command designed for testing the readiness of your
ISDN line which uses one B-channel (B1) to place a call and the
other B-channel (B2) to receive the call.
Follow these instructions to make your test call:
Type:
AT&ZOI=
your_isdn_number
<Enter>
TA128 responds: