Schmid Watson Przewodnik Instalacji Strona 88

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SZ-DOC-W5-1.pdf LTU/NTU
Version: 1.5 Operating Manual
79 Revision: 2002-09-10
8 Point-to-Multipoint Operation
This chapter describes the point to multipoint operation.
8.1 Features
In point-to-multipoint operation the time slots of the E1 frame may be sent to different NTUs.
In the Watson 5 point-to-multipoint implementation the time slots of the two E1 interfaces
may be assigned to four DSL loops.
It is configurable which time slots on the DSL loops are used to carry the data from the E1
interface.
To distribute the time slots from one E1 interface to more than four DSL loops, multipoint
LTUs can be cascaded.
Figure 8-1 shows some examples of multipoint configurations, which are obtained by
configuring explicitly point-to-point links. (Switching-off multipoint mode yields configuration a)
= pure dual LTU operation.) In addition, LTUs can be cascaded e) to increase the number of
links.
D
A
B
C
E1
1
E1
2
D
A
B
C
E1
1
E1
2
D
A
B
C
E1
1
E1
2
D
A
B
C
E1
1
E1
2
D
A
B
C
E1
1
E1
2
b)
c) d)
e)
D
A
B
C
E1
1
E1
2
a)
Figure 8-1: Examples of Multipoint Configuration
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