ZyXEL Omni TA 128 User Guide - Page 70
Selecting V.120 for Germany National ISDN
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Selecting V.120 for Germany National ISDN (1TR6) 1TR6 data connections are achieved by setting the Service Indicator to 7 (Daten_bertragung 64Kbps) and the Additional Information octet is used to select B channel protocols. Since there is no pre-defined code for asynchronous V.120, TA128 uses the synchronous V.120 code to fill in the additional information octet. This approach might not work all the time. 58
58
Selecting V.120 for Germany National ISDN
(1TR6)
1TR6 data connections are achieved by setting the
Service
Indicator
to 7 (Daten_bertragung 64Kbps) and the
Additional
Information
octet is used to select B channel protocols. Since
there is no pre-defined code for asynchronous V.120, TA128 uses
the synchronous V.120 code to fill in the additional information
octet. This approach might not work all the time.