Westermo MR Series - Manual (Page 32)

32 6622-3201
Web Interface and Command Line Reference Guide www.westermo.com
Confi gure > ADAPT > ADAPT n 4.4
The unit incorporates two “Adapt” (rate adaptation protocol) instances. Each instance allows you to
select and configure the protocol to be used for providing rate adaptation over an ISDN B channel.
The supported protocols are V.110, V.120 and X.75. Depending on which protocol is selected, there
may be an associated LAPB instance (distinct from the two general purpose LAPB instances), as for
exam ple, when V.120 is used in error corrected (Multi-frame) mode.
Using the Web Page(s)
V120 mode:
When the V mode parameter (see below), has been set to “V120”, the V120 mode parameter
allows you to select “Unacknowledged”, “Multi-frame” or “Multi-frame/Fallback” mode for V.120
operation.
“Unacknowledged” mode is the simplest mode and does not provide error control.
“Multi-frame” mode provides error control but may only be used if the remote system also sup-
ports this mode. In “Multi-frame/Fallback” mode, the unit will attempt to establish a multi-frame
error controlled link
but will allow a connection in Unacknowledged mode if the remote unit does not support error
control.
MSN:
This parameter provides the filter for the ISDN Multiple Subscriber Numbering facility. It is
blank by default but when set to an appropriate value it will cause the unit to answer only
incoming calls to telephone numbers where the trailing digits match that value (if answering
is enabled). For exam ple setting MSN to 123 will prevent the unit from answering any calls to
numbers that do not end in 123.
Sub-address:
This parameter provides the filter for the ISDN sub-address facility. It is blank by default but
when set to an appropriate value with answering enabled, it will cause the unit to answer
incoming calls only to ISDN numbers where the trailing digits of the sub address called match
that value. For example, setting the Sub-address parameter to 123 will prevent the unit from
answering any calls to numbers where the sub address does not end in 123.
CLI:
Calling Line Identification. The unit will only answer calls from numbers whose trailing digits
match what is entered in this field. The line the unit is connected to must have CLI enabled by
the tele coms provider, and the calling number cannot be withheld.
V mode:
This parameter allows you to specify which rate adaptation protocol to use and can be set to
one of the following:
Option Description
V.120 Mode This allows one B-channel to carry multiple sub-rate channels in a suc-
cession of statistically multiplexed (variable-length) frames. These frames
support error detection and correction procedures if selected under V120
mode (above).
V.110 Mode V.110 is a fixed-frame based rate adaptation standard that subdivides the
ISDN B-channel capacity so that it can carry one lower speed (sub-rate)
data channel.
V110/V120 Detect This mode detects which protocol (V.110 or V.120) the remote host is
using.
X75 Transparent This selects bit transparent X.75 mode of operation.
X75 T.70 NL This option generates T.70 NL telematic prefixes that are required by
some ISDN terminal adapters.