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Watson Ethernet

Operating Manual

Watson-Ethernet-Manual.doc

Version 3.3-01

3-2

Revision: 2010-01-20

The linerate rate, i.e. the data rate available to the application is calculated as fol-

lows:

893



pairpertimeslotsofnumbern

pairswireofnumberm

skbitnmLinerate

Note: n = 3 … 36 for the Watson Ethernet tabletop modem

The physical DSL synchronization rate per pair is

EOCskbitincludingskbitOverheadSHDSLOH

timeslotsofnumbern

skbitOHnSyncrate

238

893



Note: n = 3 … 36 for the Watson Ethernet tabletop modem

The sync rate determines the DSL reach. Decreasing the sync rate increases

DSL reach and vice versa. The linerate rate has no influence on the DSL reach.

3.1.2 Multipair operation

Watson Ethernet modems support multipair operation (m-wire mode). This al-

lows for bandwidth aggregation of individual DSL wire pairs for higher speeds or

increased reach at a given speed.

Each wire pair of a multipair DSL span must be configured with the same line-

rate. If one pair of an m-wire span fails then the entire span must be restarted.

The following naming conventions are used in multipair operation on the Watson

Ethernet plug-in:

 DSL spans are named DSL1, DSL2, DSL3 and DSL4. A span can consist of

one or several wire pairs. The number of DSL spans available on a plug-in

depends on the plug-in configuration (Monitor command CARDMODE).

 Wire pairs within a span are named A, B, C and D. Depending on the number

of wire pairs within a span the wire pairs B, C or D might not exist.

 Physical wire pairs available at the plug-in DSL connector are named a, b, c

and d.

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Schmid Watson Specifications Page 24