Netgear XM128 ISDN User Manual Page 65

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Reference Guide for the Model XM128 ISDN Digital Modem
ISDN Overview 6-17
The ATB0x commands not only specify the outgoing protocol, but also set the default layer 3
for an incoming X.75 call without layer 3 information. It is important for both ends of an X.75
connection to execute the same preassigned layer 3 protocol because it reduces the chance of
the Model XM128 modem making the wrong protocol selection.
For European ISDN (DSS1), the low-layer compatibility (LLC) information element in the setup
message can be used to specify the layer 3 protocol. Because this is an option for ISDN switches,
some of the switches might not deliver the LLC information element to the remote end. There is no
provision for 1TR6 switches to specify the layer 3 protocol for X.75 type of calls.
Making a Bundled Call with X.75
A bundle connection is initiated at the calling site by sending two consecutive setup messages
to the network. The two setup messages are all the same except for the Call Reference values.
AT&Jn can be used for bundle configuration as follows:
AT&J0 (disables B channel bundling)
AT&J1 (enables B channel bundling in answer mode only)
AT&J2 (enables B channel bundling in call mode only)
AT&J3 (enables B channel bundling in both call and answer modes)
The bundle protocol can be selected as follows:
ATS100=0 (MLP channel bundling)
ATS100=1 (CCB channel bundling)
If channel bundling is enabled, the ATDIs command generates two consecutive setup messages to
invoke bundle initiation.
For Northern Telecom ISDN, each BRI destination phone number can be called only once at any
time. In order to use two B channels for aggregation, you must place two calls with different phone
numbers. For this purpose, enter the following command:
ATDIphone_number_1+phone_number_2
If the called site receives two consecutive setup messages with the same calling party number and
bearer capability (or origination address for and service indicator for 1TR6), then it is deemed as a
bundle request. The two data calls are established following normal call control procedures. That
is, the network treats them as two independent calls.
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