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1TR6
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VN2
A.3.
CONNECTION ALLOWANCE BETWEEN CVs
A CV can be assigned to an internal port as follows:
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ALC or DLC-circuits: each circuit is assigned a DNR. This DNR is assigned a CV with the
OM-command CHAGCV;
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ATU or DTU-circuits: each circuit is assigned as a trunk or tie line in a route. This route is
assigned a CV with the OM-command CHRTCG.
The CV is used as a tool for determining which ports can be connected together. The CV
connection allowance can be:
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Not possible (0). The ports may not be connected and are not compatible.
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Not allowed (1). The ports may not be connected (even though they may be compatible).
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Allowed with convertor (2). A modem must be used to connect the two ports.
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Allowed (3). The ports can be connected together.
The OM-command CHCVCA is used for defining the connection allowance between CVs.
The command defines the connection allowance between the calling party (CV-A) and the
called party (CV-B). To allow a connection to be set-up in both directions the command must
be used twice, the allowance from party X to party Y and the allowance from party Y to party
X.
For example: the following CV connection allowances have been defined in a FIN:
60
1TR6-Service Indicator (1TR6-SI)
VN2-Service Indicator (VN2-SI)
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