Specifications

Watson TDM
Operating Manual
Watson-TDM-Manual-W.doc
Version 2.0-01
3-2
Revision: 2008-02-07
Some Watson TDM modems also support m-wire operation on 2, 3 and 4 wire
pairs.
The payload rate, i.e. the data rate available to the application is calculated as
follows:
[
]
)(pairpertimeslotsofnumbern
)(pairswireofnumberm
s/kbitnmePayloadRat
893
41
64
Λ
Λ
=
=
×
×
=
The linerate per pair is
[
]
otherwise,enabledbitZifs/kbitZ
)EOCs/kbit.includings/kbit(OverheadSHDSLOH
)(timeslotsofnumbern
s/kbitZOHnLinerate
08
238
893
64
−=
=
=
+
+
×
=
Λ
The linerate determines the DSL reach. Decreasing the linerate increases DSL
reach and vice versa. The payload rate has no influence on the DSL reach.
3.1.3 Multipair operation
Watson TDM modems equipped with more than one DSL system can be config-
ured for multipair operation:
Modem Type
LTUMODE Mode
System
1 2 3 4
2 x DSL single link
1 1
A
2 1
A
2 2
A/B
4 x DSL quad link
1 1
A B C D
2 1
A C
2 2
A/B C/D
4 1
A
4 2
A/B
4 3
A/B/C
4 4
A/B/C/D
LTUMODE is set by the LTUMODE command in the monitor, see 8.2.2
Mode is set by the MODE command in the monitor, see 0
A/B/C/D: DSL Pairs
1/2/3/4: subsystems addressable through the monitor
Not available
Table 3-1: Multipair configurations