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SZ-DOC-W5-1.pdf LTU/NTU
Version: 1.5 Operating Manual
9 Revision: 2002-09-10
3 Interface Configuration Options
The following sections describe the various configuration options. On the plug-in LTU, the
operating modes are configurable via the V.24 monitor interface or via the TMN interface of the
ACU, whereas on the minirack LTU, table-top NTU and minirack NTU, they are directly
configurable via the monitor interface. If the LTU/NTU is slave, it is also configurable from the
master side. Only the remote/local powering has to be configured via jumpers on the board of
the LTU or via slide switches on the NTU.
3.1 DSL
The following configuration options refer to the DSL side and do not affect the user interface
operating mode.
3.1.1 Master / Slave
To start up a DSL link, one system unit must be configured as master and the other one as slave.
The master controls the link start-up procedure. If both system units are configured as
master or as slave, no start-up will occur.
Usually, the LTU is configured as master and the NTU as slave (default setting). However, it is
possible to set up a DSL link with two LTUs or two NTUs, as long as one is configured as master
and the other one as slave. In these cases, remote powering is not possible. To configure a LTU
as a slave it is necessary to set the R/L jumpers located on the PCB in position "RPWR OFF".
Generally, the master-slave permissions are:
The slave unit has only the permission to change its own configuration locally. It cannot
access nor modify the master unit's configuration or data. Access to the slave unit's
configuration or data is possible via local monitor or via the master unit.
The master unit has local access as well as remote access to the slave unit. For safety
reasons, only the master / slave configuration and the autorestart option cannot be altered
by the master unit over the DSL link.
When the “Remote” LED on the front panel of the NTU is lit, the system unit is configured as
master.
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