Westermo MR Series - Manual (Page 372)

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Web Interface and Command Line Reference Guide www.westermo.com
Using V.120 9
V.120 is a protocol designed to provide high-speed point-to-point communication over ISDN. It pro-
vides rate adaptation and can optionally provide error control. Both the calling and called units must
be configured to use V.120 before data can be transferred. Similarly, if one unit is configured to use
the error control facility, the other must be configured in the same way.
Initial Set Up 9.1
Before using V.120 you must first bind one of the two available V.120 instances to the required ASY
port using the Configure > Protocol Bindings page or by using the bind command from the com-
mand line, for example:
bind v120 0 asy 0
You should also select the appropriate method of flow control for the ASY port using the
Configure > ASY ports page or by using the AT&K command from the command line. Other ASY
port options such as command echo, result code format, etc. should also be configured as necessary.
Initiating a V.120 Call 9.2
Once the initial configuration is complete, V.120 calls may be initiated using the appropriate ATD
com mand. For example:
atd01234567890
A successful connection will be indicated by a CONNECT result code being issued to the ASY
port and the unit will switch into on-line mode. In this mode, all data from the terminal attached
to the bound ASY port will be passed transparently through the unit across the ISDN network to
the remote system. Similarly, all data from the remote system will be passed directly to the terminal
attached to the bound ASY port.
If a V.120 call fails the unit will issue the NO ANSWER or NO CARRIER result code to the ASY
port and remain in command mode.
The ATD command may also be used to route a call to an ISDN sub-address by following the tele-
phone number with the letter S and the required sub-address value.
For example:
atd01234567890s003
In this case, the remote system will only answer the call if it has been configured to accept incoming
calls on the specified sub-address.