Schmid Watson Specifications download pdf (Page 23)

Revision: 2008-02-07 3-1

3 Watson TDM Features

3.1 DSL Interface

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 DSL master (STU-

C) and the other one as DSL slave (STU-R). 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, plug-in modems are configured as master and tabletop modems as

slave (default setting). However, it is possible to set up a DSL link with two plug-

in or two tabletop modems, as long as one is configured as master and the other

one as slave. In these cases, remote powering is not possible.

Generally, the master-slave permissions are:

• On a slave unit it is possible to change the local configuration. A slave can

neither 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.

• On a master unit both local and the slave configuration can be modified. For

safety reasons 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 a tabletop modem is lit, the system

unit is configured as master.

3.1.2 Linerates and payload rates

Watson TDM supports payload bitrates on multiples of 64 kbit/s with the optional

use of one Z-bit according to ETSI TS 101 524.

The Z-bit can be configured to add bandwidth for the embedded operating chan-

nel (EOC) within the SHDSL overhead. The effective bandwidth of the EOC

without the Z-bit is 3.2 kbit/s. The EOC bandwidth is increased to 11.2 kbit/s with

the Z-bit.

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Schmid Watson Specifications Page 23